WO2004074802A1 - 超精密微小差圧測定装置及び超精密差圧測定装置 - Google Patents
超精密微小差圧測定装置及び超精密差圧測定装置 Download PDFInfo
- Publication number
- WO2004074802A1 WO2004074802A1 PCT/JP2004/001513 JP2004001513W WO2004074802A1 WO 2004074802 A1 WO2004074802 A1 WO 2004074802A1 JP 2004001513 W JP2004001513 W JP 2004001513W WO 2004074802 A1 WO2004074802 A1 WO 2004074802A1
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- WIPO (PCT)
- Prior art keywords
- pressure
- space
- receiving plate
- differential pressure
- ultra
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
- G01L13/06—Devices or apparatus for measuring differences of two or more fluid pressure values using electric or magnetic pressure-sensitive elements
-
- 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
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
Definitions
- the present invention relates to an ultra-precision micro-differential pressure measuring device and an ultra-precision measuring device using a high-performance electronic mass / pressure transducer, and for measuring pressure drop characteristics of a gauge reference device and a low-resistance filter.
- An ultra-precision micro ⁇ JE measuring device used as a tool for monitoring filter performance and evaluating flow characteristics in fluid equipment that handles gas under reduced pressure, and an ultra-precision differential pressure commonly used for measuring differential pressures of several atmospheres It relates to a measuring device.
- an Ascania-type manometer which reads the height of the liquid column visually, has a reading resolution of about 0.1 mm at most, and a water column nanometer (n mA q) It is impossible to measure continuously and accurately the minute ⁇ BE of the order, and the measured value cannot be output continuously as an electric signal.
- n mA q water column nanometer
- Patent Document 1 Japanese Utility Model Publication 6- 7 6 9 3 7
- Patent Document 2 Japanese Patent Publication No. 2-5 2 9 7 5
- the present invention relates to the above-mentioned problems in the conventional measuring apparatus for minute pressure and minute differential pressure and the general-purpose electronic differential pressure measuring apparatus as described above, namely, (1) reading with a type that visually detects the liquid column height. In addition to the low accuracy, it is not possible to output the detected value continuously. (2) In the case of the type using an electronic weigher, a mechanism that converts pressure into force and transmits it to the electronic weigher It is inevitable that measurement errors will occur due to friction of the moving parts of the robot, and it will be difficult to measure small differential pressure, and it will solve problems such as low measurement accuracy.
- the converter itself is arranged in the space where the pressure to be measured is applied, and a sealing liquid is provided between the pressure space to be measured and the other space to be measured via a pressure receiving plate fixed to electronic weighing / pressure change. Or airtight isolation by partition membrane.
- n mA q water column nanometers
- the inventors of the present invention have proposed a conventional method in which a pressure receiving plate forming a pressure receiving surface is supported via a sliding mechanism (movable mechanism) so that a force applied to the pressure receiving plate is transmitted to an electronic weighing machine.
- a sliding mechanism movable mechanism
- the frictional resistance generated in the sliding portion causes an error, and is judged to be inappropriate for measurement of an ultra-small differential pressure.
- the inventions of the present application were created based on the results of the above-mentioned ideas and measurement experiments.
- the invention according to claim 1 is a pressure receiving plate that is disposed in the internal space of the device main body 1 having a space therein and divides the internal space into a lower space 7 and an upper space 8 in an airtight manner.
- electronic weighing and pressure change 2 disposed in the lower space 7 to support and fix the pressure receiving plate 3 thereon, and the outer peripheral edge of the pressure receiving plate 3 is liquid-sealed to form the lower space 7 and the upper portion.
- a liquid seal portion R for maintaining the airtightness between the space 8 and the space, and a small differential pressure between the pressure P in the upper space 8 and the pressure P 2 in the lower space 7 is electronically transmitted through the pressure receiving plate 3.
- the basic configuration of the present invention is that the measurement is performed by the weighing / pressure transducer 2.
- the invention of claim 2 is the invention according to claim 1, wherein the device main body 1 is provided with a lower main body 7 having a pressure introducing hole 7 a communicating with the lower space 7, and a pressure introducing hole 8 a communicating with the upper space 8. And an upper body 8 having an annular sealing liquid storage groove 9 on the inner wall surface of the internal space.
- the invention of claim 3 is characterized in that, in the investigation of claim 1, the pressure receiving plate 3 comprises a flat disk plate 3a and a sealing wall 3 protruding downward from an outer peripheral edge thereof. is there.
- the invention of claim 4 is the invention according to claim 1, wherein the electronic weighing and pressure transducer 2 continuously takes out the weighed value in the form of an electric signal, sends it to a computer, converts it to a differential pressure, and outputs it.
- the configuration is such that:
- the invention according to claim 5 is the computer according to claim 4, wherein the electronic weight / pressure converter 2 converts the weighing signal from the electronic weigher and the weighing signal from the electronic weigher into a differential pressure and outputs the pressure difference. And a configuration consisting of:
- the invention of claim 6 is the invention of claim 1, wherein the electronic weighing / pressure transducer 2 is configured to support and fix the pressure receiving plate 3 via the support 4 on the receiving table 5. It is.
- the invention according to claim 7 is the invention according to claim 1, wherein the electronic weighing pressure transducer 2 is supported and fixed to the pressure receiving plate 3 via a support 4 having an upper end, a lower end, or an upper and lower end having a pointed shape.
- the configuration is such that:
- the liquid sealing portion R is formed into an annular sealing liquid storage groove 9 formed on the inner wall surface of the internal space of the apparatus main body 1 and into the sealing liquid storage groove 9.
- a ring-shaped sealing wall 3b provided in the above.
- the invention of claim 9 is the invention of claim 8, wherein the liquid seal portion R is a liquid seal portion in which all or a part of the liquid contact portion has been subjected to a surface treatment for maintaining uniform wettability. It is.
- the ultra-precision differential pressure measuring device is provided in the device main body 1 having a space therein, and the internal space of the device main body 1, and the internal space is divided into a lower space 7 and an upper space. 8, an electronic weighing / pressure change $ «2 disposed in the lower space 7 and supporting and fixing the pressure receiving plate 3 thereon, and an outer peripheral surface of the pressure receiving plate 3.
- a partition membrane 10 which is disposed in a gap between the inner space of the device body 1 and maintains the airtightness between the lower space 7 and the upper space 8, the pressure P i in the upper space 8 and the lower space the ⁇ EE between the pressure P 2 in 7 in which the basic configuration of the invention that is configured to be measured by electronic weighing ⁇ pressure transducer 2 via the pressure receiving plate 3.
- the invention of claim 11 is the invention according to claim 10, wherein the device main body 1 is connected to a lower body 7 having a pressure introduction hole 7 a communicating with the lower space 7, and a pressure guide communicating with the upper space 8.
- the upper body 8 having the inlet hole 8a is combined with the upper body 8 in an opposed manner, and a fitting groove 3d is formed in the outer peripheral surface of the pressure receiving plate 3 to insert the inner peripheral edge of the partition membrane 10 perpendicularly thereto.
- a fitting groove 1 d for inserting the outer peripheral edge of the partition film 10 into the inner wall surface of the main body 1 at the same height as the fitting groove 3 d is provided perpendicularly to the fitting groove 3 d.
- the invention of claim 12 is the invention of claim 10, wherein the partition film 10 is a flange-shaped partition film made of a resin film or a metal thin film, and the outer peripheral edge of the partition film 10 is formed.
- the configuration is such that the inside of the fitting groove 1 d of the device body 1 and the inner peripheral edge thereof are airtightly inserted into the inside of the fitting groove 3 d of the pressure receiving plate 3.
- the invention of claim 13 is the invention of claim 10, wherein the electronic weighing-pressure converter 2 continuously takes out the weighed value in the form of an electric signal, converts it into ⁇ ] £ by a computer, and outputs it.
- the configuration is such that:
- the invention of claim 14 is the invention of claim 10, wherein the electronic weighing and pressure converter 2 is a combination for converting the electronic weighing device and the weighing signal from the electronic weighing device into differential pressure and outputting the differential pressure. And a data structure.
- the invention of claim 15 is the invention of claim 10, wherein the electronic weighing / pressure converter 2 is The pressure receiving plate 3 is supported and fixed on the receiving table 5 with a support 4 interposed therebetween.
- the invention according to claim 16 is the invention according to claim 10, wherein the electronic weighing / pressure transducer 2 is provided with a support 4 having an upper end, a lower end, or an upper end and a lower end pointed through a pressure receiving plate 3. It is configured to support and fix.
- the pressure receiving plate 3 since the pressure receiving plate 3 does not move at all in the vertical direction, the pressure receiving plate 3 has no influence on the meniscus created by the sealing liquid 6.
- liquid level height of the sealing liquid 6 forming the two annular liquid levels differs depending on the pressure difference ⁇ between the two pressure spaces 7 and 8, but the areas A i and A 2 of the two liquid levels will be described later. As such, equality is not a requirement.
- an electronic weighing / pressure converter 2 is provided in a lower space 7 in the apparatus main body 1, and the inside of the apparatus main body 1 is divided into a lower space 7 and an upper part by a pressure receiving plate 3 and a liquid sealing portion R on an outer peripheral edge thereof.
- the space is divided into a space 8 in an airtight manner, and the force due to the pressure difference between the two spaces 7 and 8 applied to the pressure receiving plate 3 is continuously measured by an electronic weighing / pressure change 2 and the pressure is converted into a pressure difference.
- the output is converted and output as an electric signal.
- the force generated by the differential pressure is directly transmitted to the electronic weighing / pressure change 2 via the pressure receiving plate 3 fixed on the electronic weighing / pressure transducer 2, and the differential pressure Since no mechanical friction part exists in the transmission path of the force generated by the above, the measurement accuracy of the differential pressure can be greatly improved, and the electronic weighing and pressure conversion with the minimum weighing appropriately selected
- the use of the measuring device 2 enables high-precision continuous measurement of minute differential pressure having a significant figure of three digits or more, for example, minimum weighing. Is 0.0 000 g electronic weighing ⁇ pressure change 2 In the case of using, a high precision continuous measurement of ⁇ 1 ⁇ on the order of several hundred nanometers of water column is possible.
- the density of the sealing liquid 6 forming the liquid sealing portion R is not related to the measurement of the differential pressure, any liquid can be used as the sealing liquid.
- the partition film 10 is a flexible thin film, the partition film to the fitting groove 1 d of the device main body 1 and the fitting groove 3 d of the pressure receiving plate 3. 10 does not induce a vertical force on the pressure receiving plate 3.
- the shape and weight of the pressure receiving plate 3 that is, its material, thickness, and shape are completely unrelated to the measurement of the differential pressure
- the material, thickness, shape, and the like of the pressure receiving plate 3 can be arbitrarily selected. From this aspect, it is possible to further reduce the manufacturing cost of the measuring device.
- a reference device or the like is required for performing the calibration and verification, and it is necessary to actually generate ⁇ ⁇ at the time of verification. In a measuring device, by mounting a weight corresponding to (pressure), calibration and verification can be easily performed without requiring a, which is extremely convenient.
- the present invention enables extremely high-precision continuous measurement of very small differential pressure and continuous output of measured values by electric signals with an extremely simple structure and an inexpensive device. It has excellent practical utility.
- FIG. 1 is a schematic cross-sectional view of an ultra-precision micro differential pressure measuring apparatus according to the first embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view of an ultra-precision micro differential pressure measuring apparatus according to another embodiment of the present invention. is there.
- FIG. 3 is a cross-sectional view showing a state of the annular liquid sealing portion R when the differential pressure is zero.
- FIG. 4 is a cross-sectional view showing a state of the annular liquid sealing portion R when a differential pressure is generated.
- FIG. 5 is a schematic sectional view of a general-purpose ultra-precision differential pressure measuring apparatus according to the second invention.
- FIG. 6 is a partially enlarged cross-sectional view showing a state in which the upper and lower spaces are separated by a partition film.
- 1 is the device body, 1 a is the lower body, 1 b is the upper body, 1 d is the fitting groove, 2 is the electronic weighing and pressure transducer, 3 is the pressure receiving plate, 3 is the flat disk plate, 3 b Is a sealing wall, 3c is a receiving groove, 3d is a fitting groove, 4 is a support, 4a is a pointed head, 5 is a support base, 6 is a sealing liquid, 7 is a lower space, 7 a is a pressure introducing hole, 8 is an upper space, 8a is a pressure introducing hole, 9 is a sealing liquid storage groove, R is an annular liquid sealing portion (sealing wall 3b, sealing liquid 6 and a storage groove 9), ⁇ ⁇ is the area of the outer ring, ⁇ 2 is the area of the inner ring, S x is the area of the upper surface of the pressure receiving plate, S 2 is the area of the lower surface of the pressure receiving plate, S e is the effective pressure receiving area, De is the effective diameter, p
- P bo fluid pressure in the sealing wall 3 b position of the lower end surface of the case of the differential pressure is zero
- P x is the pressure in the upper space 8 Outside when P 2 is the pressure in the lower space 7
- hb is the sealing wall 3 b lower end surface and the outer ring portion of the distance between the liquid surface of when 3 ⁇ 41 ⁇ occurs
- h x has occurred the distance between the liquid surface when the liquid level and the differential pressure ring section is zero
- the distance between the liquid surface when the liquid level and 3 ⁇ 4] ⁇ the inner annular portion is zero when h 2 is occurs
- P b is the hydraulic pressure at the lower end face of the sealing wall 3 b when a differential pressure is generated
- 10 is the partition membrane
- D is the diameter of the pressure receiving plate
- ⁇ is the end face of the pressure receiving plate 3 and the lower body. This is the dimension of the gap with the inner wall surface of 1a.
- FIG. 1 is a schematic cross-sectional view of an ultra-precision micro differential pressure measuring apparatus according to the present invention.
- 1 is the apparatus main body
- 2 is an electronic weighing / pressure converter
- 3 is a pressure receiving plate
- 4 is a support.
- Reference numeral 5 denotes an electronic weighing / pressure transducer cradle
- reference numeral 6 denotes a sealing liquid.
- the device main body 1 is formed in a box shape having a space therein by metal or engineering plastic.
- the lower main body 1a and the upper main body 1b are combined in an opposing manner, and both are hermetically sealed.
- the main body 1 is formed by fixing the main body 1 to the main body.
- the apparatus main body 1 is formed by assembling the lower main body 1a and the upper main body 1b, each of which has a circular planar shape, in opposition to each other.
- the structure may be substantial. You.
- the lower main body la is provided with a pressure introducing hole 7a communicating with the internal space 7, and the upper main body 1b is provided with a pressure introducing hole 8a communicating with the internal space 8.
- An annular sealing liquid 6 having a predetermined width and depth and having an open upper surface is formed in the inner peripheral wall of the apparatus body 1.
- the sealing groove 9 is formed in the storing groove 9. Liquid 6 is stored.
- FIG. 1 Although in the embodiment of FIG. 1 to form a reservoir groove 9 in the upper part of the inner peripheral wall surface of the lower body 1 a, as shown in FIGS. 3 and 4, among the reservoir groove 9 of the upper body 1 b It may be formed on the peripheral wall.
- the electronic weighing / pressure transducer 2 is provided in one pressure space (the internal space 7 of the lower main body 1a), and is supported and fixed to the lower main body 1a.
- the electronic weighing-to-pressure converter 2 includes an electronic weighing device and a computer that converts the weighed value from the electronic weighing device into a differential pressure and outputs the pressure difference.
- the electronic weighing device itself is publicly known, detailed description thereof is omitted here, but the measured small ⁇ ⁇ P is measured in a range of several hundred nanometers of water column having a significant figure of about three digits. In order to do so, as shown below, an electronic weigher with a minimum display of about 0.001 g is used. As the maximum weighing capacity, select a capacity that is appropriate for the maximum differential pressure to be measured.
- the electronic weighing device the HX series manufactured by AND Corporation, the upper plate electronic balance HX-100 is used, the minimum display is 0.001 g, and the maximum weighing capacity is 1 g. I'm using
- the pressure receiving plate 3 is formed in an inverted dish shape by processing a plastic material, and a sealing wall 1b is formed on the outer peripheral edge of the flat circular disk 3a so as to project downward at a right angle. Have been.
- the material of the pressure receiving plate 3 is not limited to a plastic material, and may be formed using a metal material.
- the pressure receiving plate 3 is configured such that the outer peripheral edge sealing wall 1 b is inserted into the sealing liquid 6 in the storage groove 9 as shown in FIG. It is supported and fixed in a horizontal position on the cradle 5 of the transformer 2, and the pressure plate 3 itself moves up and down. It doesn't move at all.
- the pressure receiving plate 3 is formed of plastic having a thickness of about 2 mm, and its diameter D conforms to the maximum value and the minimum value of the measured differential pressure ⁇ as exemplified later. The size is selected.
- the support 4 is formed of a metal into a cylindrical shape or a truncated cone, and the height dimension is appropriately selected according to the external dimensions of the device main body 1.
- the material of the support 4 may be any material, and in the present embodiment, the support 4 is formed by gunmetal.
- the shape of the support 4 is not limited to a cylinder or a truncated cone, but may be a rectangular parallelepiped such as a trapezoid, a rectangle, or a square in a side view.
- the storage height of the sealing liquid 6 is appropriately selected according to the magnitude of the measured 3 ⁇ 4J ⁇ P as described later.
- the density of the sealing liquid 6 can be weighed by the measured differential pressure ⁇ P so as not to be directly related to the downward pressing force Fa applied to the electronic weighing / pressure transducer 2.
- the pressure receiving plate 3 and the sealing liquid 6 allow the inside of the device body 1 to communicate with the lower space 7 communicating with the pressure introducing hole 7a and the pressure introducing hole 8a.
- the force F corresponding to the electronic weighing and pressure change 2 is continuously measured, and the measured weighing value Is converted into by the computer, and is continuously output to the outside as an electric signal.
- FIG. 2 is a schematic cross-sectional view of the ultra-precision micro differential pressure measuring apparatus according to the second embodiment of the present invention, in which the upper main body 1b and the lower main body 1a are airtightly connected without using a flange.
- the point that one end of the support 4 is pointed and the point that the electronic weighing-pressure converter 2 does not have a pedestal are the same as those of the apparatus according to the first embodiment shown in FIG.
- the other configuration is the same as that of the device according to the first embodiment.
- the upper end of the support 4 is formed in a pointed shape 4a
- the head 4 a is engaged in a receiving groove 3 c formed on the lower surface side of the pressure receiving plate 3.
- the engagement of the pointed head 4a into the receiving groove 3c prevents the pressure receiving plate 3 from moving in the lateral direction.
- the shape of the support 4 and the number of the support 4 can be freely selected as long as the pressure receiving plate 3 can be stably supported.
- the electronic weighing / pressure change 2 is arranged in the lower space 7, but the electronic weighing / pressure converter 2 is arranged in the upper space 8 downward,
- the plate 3 may be supported and fixed in a suspended manner via the support 4.
- FIGS. 3 and 4 are explanatory diagrams relating to the differential pressure ⁇ P applied to the electronic weighing / pressure converter 2 in the ultra-precision fine differential pressure measuring apparatus of the present invention shown in FIG.
- FIG. 4 shows the state of the annular liquid sealing portion R in the case where ⁇ ⁇ ⁇ —P 2 > 0 occurs between the lower space 7 and the upper space 8.
- S 1 is the area of the upper surface of the pressure receiving plate 3
- S 2 is the area of the lower surface of the pressure receiving plate
- p is the density of the sealing liquid 6
- g is the acceleration of gravity
- a x is the annular liquid sealing portion.
- area of the inner annular portion of the area of the outer ring portion of R, the a 2 annular fluid seal portion R, P. Is the pressure in the upper and lower spaces 8 and 7 when the differential pressure is zero
- hbo is the distance between the lower end surface of the sealing wall 3 b and the liquid surface of the sealing liquid 6.
- the wet state is obtained. It may fluctuate over time and may be a disturbance factor for the force Fa generated by the differential pressure ( ⁇ ⁇ - ⁇ ⁇ ).
- an effective measure can be taken by applying a liquid repellent treatment to the wall surface in contact with the liquid in advance.
- the output of the electronic weighing device is converted into ⁇ ] by a computer, and the differential pressure (P 1 -P 2 ), and the above equation (1 2) is independent of the density P of the filling liquid 6 and the weight of the pressure receiving plate 3. Therefore, the material and shape of the filling liquid 6 and the pressure receiving plate 3 are Etc. may be any.
- the effective pressure receiving area S e is expressed in terms of the effective diameter D e mm of the pressure receiving plate.
- the measured differential pressure ⁇ P is 0. 0 1 2 7 3 mmAci.
- the value of P is 79.5.8 n mA q. In this case, the number of water columns having significant figures of about three digits It is possible to measure a differential pressure ⁇ P of 100 nanometers.
- ultra-precision micro differential pressure measuring apparatus of the present invention by weighing F uses 0. 1 g ⁇ 0 ⁇ 0 0 0 1 g of electronic weighing 'pressure varying ⁇ 2, 3 orders of magnitude It is possible to measure a minute ff having a significant figure larger than that with high accuracy.
- FIG. 5 is a schematic cross-sectional view of a general-purpose ultra-precision differential pressure measuring device according to an embodiment of the second invention of the present application.
- the difference from the first invention is that a sealing method using a partition film 10 is employed instead of the sealing method.
- 1 is an apparatus main body
- 2 is an electronic weighing 'pressure transducer
- 3 is a pressure receiving plate
- 4 is a support (a load transmitting cone)
- 7 is a lower space
- 8 is an upper space
- Reference numeral 10 denotes a partition film
- the other configuration except for the partition film 10 is the same as that of the first invention shown in FIGS. 1 to 4.
- the upper space pressure (primary pressure) and the lower space pressure P 2 (secondary pressure) are increased.
- a partition membrane 10 is used for isolation.
- the partition film 10 may be (a) thin and flexible (having a flexible characteristic), (mouth) even if the partition film 10 expands and contracts due to temperature change or the like. It is desirable that the device has characteristics such as that no force is applied to the electronic weighing / pressure transducer 2 and (c) it can maintain stable airtightness over a long period of time and have excellent corrosion resistance.
- a resin film or a metal thin film having a thickness of 5 to 200 xm is used.
- the pressure receiving plates 3 at both ends of the partition film 10 and the lower portion are formed.
- the fixing point to the main unit 1a is held on the same horizontal plane, and the partition membrane 10 is provided with a structure as shown in Fig. 6 so that the force itself applied to the electronic weighing-pressure change 2 is hardly induced. Is slightly loosened.
- FIG. 6 is a partially enlarged view showing an isolated portion between the upper and lower spaces 8 and 7 by the partition film 10.
- the inner peripheral edge and the outer peripheral edge of the narrow flange-shaped (ring-shaped) partition film 10 are shown. Are each receiving The end faces of the pressure plate 3 and the inner peripheral wall of the lower main body 1a are inserted into fitting grooves 3d and 1d, respectively, which are formed vertically, and are bonded (or pressed) in an airtight manner.
- D is the diameter of pressure receiving plate 3
- ⁇ is the gap between the end face of pressure receiving plate 3 and the inner wall surface of lower body 1a
- F a is Hff iPi—Ps, ⁇ ⁇ ⁇ 2 ).
- FD is the force generated on the pressure receiving plate 3
- F p is the force generated on the partition membrane 10.
- the ultra-precision micro-differential pressure measuring device is a tool for measuring the pressure drop characteristics of a reference device of a differential pressure gauge and a low-resistance filter, monitoring the filter performance, and evaluating the flow characteristics of a fluid device handling a gas under reduced pressure.
- the ultra-precision differential pressure measuring device is generally used for measuring a differential pressure of about several atmospheres for general industrial use and the like.
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Abstract
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/546,159 US7185543B2 (en) | 2003-02-20 | 2004-02-12 | Ultra-precision micro-differential pressure measuring device and ultra-precision differential pressure measuring device |
EP04710547A EP1596177A4 (en) | 2003-02-20 | 2004-02-12 | SUPER PRECISE MICRO-DIFFERENTIAL PRESSURE MEASUREMENT DEVICE AND SUPER PRECISED DIFFERENTIAL PRESSURE MEASUREMENT DEVICE |
CA002516387A CA2516387A1 (en) | 2003-02-20 | 2004-02-12 | Super-precise micro-differential pressure measuring device and super-precise differential pressure measuring device |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-042247 | 2003-02-20 | ||
JP2003042247 | 2003-02-20 | ||
JP2003-332600 | 2003-09-25 | ||
JP2003332600A JP3917574B2 (ja) | 2003-02-20 | 2003-09-25 | 超精密微小差圧測定装置及び超精密差圧測定装置 |
Publications (1)
Publication Number | Publication Date |
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WO2004074802A1 true WO2004074802A1 (ja) | 2004-09-02 |
Family
ID=32911408
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/001513 WO2004074802A1 (ja) | 2003-02-20 | 2004-02-12 | 超精密微小差圧測定装置及び超精密差圧測定装置 |
Country Status (7)
Country | Link |
---|---|
US (2) | US7185543B2 (ja) |
EP (1) | EP1596177A4 (ja) |
JP (1) | JP3917574B2 (ja) |
KR (1) | KR20050098306A (ja) |
CA (1) | CA2516387A1 (ja) |
TW (1) | TWI230251B (ja) |
WO (1) | WO2004074802A1 (ja) |
Families Citing this family (6)
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CN102928178B (zh) * | 2012-10-31 | 2014-12-24 | 沈阳黎明航空发动机(集团)有限责任公司 | 一种压差密封测试装置及其测试方法 |
US9454158B2 (en) | 2013-03-15 | 2016-09-27 | Bhushan Somani | Real time diagnostics for flow controller systems and methods |
CN106441698B (zh) * | 2016-11-24 | 2018-04-27 | 中国石油大学(北京) | 高压非稳定微压差计及其使用和校核方法 |
US10983538B2 (en) | 2017-02-27 | 2021-04-20 | Flow Devices And Systems Inc. | Systems and methods for flow sensor back pressure adjustment for mass flow controller |
CN107991016B (zh) * | 2017-12-15 | 2020-05-01 | 芜湖致通汽车电子有限公司 | 一种差压传感器结构 |
CN111257189B (zh) * | 2019-12-06 | 2022-04-15 | 浙江泰林医学工程有限公司 | 一种多规格空气高效过滤器检测装置 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS5735743A (en) * | 1980-08-14 | 1982-02-26 | Meisei Electric Co Ltd | Measuring device for variation of very small atmospheric pressure |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0676937B2 (ja) | 1986-06-03 | 1994-09-28 | 山田 三恵 | 電子圧測装置 |
JPH0252975A (ja) | 1988-08-17 | 1990-02-22 | Sanyo Electric Co Ltd | 商品冷蔵ケースの冷却運転方式 |
CN1409182A (zh) * | 2001-09-30 | 2003-04-09 | 李勤雄 | 用于防爆控制柜正压控制***的微差压控制器 |
JP2004226377A (ja) * | 2003-01-27 | 2004-08-12 | Ubukata Industries Co Ltd | 圧力センサー |
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2003
- 2003-09-25 JP JP2003332600A patent/JP3917574B2/ja not_active Expired - Fee Related
-
2004
- 2004-02-12 US US10/546,159 patent/US7185543B2/en not_active Expired - Fee Related
- 2004-02-12 EP EP04710547A patent/EP1596177A4/en not_active Withdrawn
- 2004-02-12 WO PCT/JP2004/001513 patent/WO2004074802A1/ja not_active Application Discontinuation
- 2004-02-12 KR KR1020057014562A patent/KR20050098306A/ko not_active Application Discontinuation
- 2004-02-12 CA CA002516387A patent/CA2516387A1/en not_active Abandoned
- 2004-02-17 TW TW093103789A patent/TWI230251B/zh not_active IP Right Cessation
-
2006
- 2006-09-29 US US11/536,925 patent/US20070022817A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5735743A (en) * | 1980-08-14 | 1982-02-26 | Meisei Electric Co Ltd | Measuring device for variation of very small atmospheric pressure |
Non-Patent Citations (1)
Title |
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See also references of EP1596177A4 * |
Also Published As
Publication number | Publication date |
---|---|
US20070022817A1 (en) | 2007-02-01 |
TW200424506A (en) | 2004-11-16 |
US7185543B2 (en) | 2007-03-06 |
KR20050098306A (ko) | 2005-10-11 |
US20060065057A1 (en) | 2006-03-30 |
TWI230251B (en) | 2005-04-01 |
CA2516387A1 (en) | 2004-09-02 |
EP1596177A4 (en) | 2007-08-29 |
EP1596177A1 (en) | 2005-11-16 |
JP2004271501A (ja) | 2004-09-30 |
JP3917574B2 (ja) | 2007-05-23 |
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