WO2015105042A1 - 流量計測装置 - Google Patents

流量計測装置 Download PDF

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Publication number
WO2015105042A1
WO2015105042A1 PCT/JP2015/000028 JP2015000028W WO2015105042A1 WO 2015105042 A1 WO2015105042 A1 WO 2015105042A1 JP 2015000028 W JP2015000028 W JP 2015000028W WO 2015105042 A1 WO2015105042 A1 WO 2015105042A1
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WO
WIPO (PCT)
Prior art keywords
flow path
measurement
substrate
flow rate
path portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2015/000028
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English (en)
French (fr)
Japanese (ja)
Inventor
佐藤　真人
中林　裕治
永原　英知
足立　明久
葵 渡辺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to US15/104,242 priority Critical patent/US9778084B2/en
Priority to EP15735455.6A priority patent/EP3093627B1/en
Priority to CN201580004060.3A priority patent/CN105899916A/zh
Publication of WO2015105042A1 publication Critical patent/WO2015105042A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/662—Constructional details

Definitions

  • the present invention relates to a flow rate measuring device, and more particularly to a flow rate measuring device that includes a measurement flow path unit housed in a fluid flow path unit and measures the flow rate of a fluid flowing through the measurement flow rate unit.
  • a flow rate measurement device including a measurement flow path unit housed in a fluid flow path unit is known.
  • a measurement flow path section around which a rubber band is wound is accommodated in a gas flow path section, and a flow velocity sensor is disposed on a side surface of the measurement flow path section.
  • This rubber band closes the gap between the inner surface of the gas flow path section and the outer surface of the measurement flow path section, guides the gas in the gas flow path section to the measurement flow path section, and controls the flow rate of the gas flowing through the measurement flow path section. Measured with a flow rate sensor.
  • the present invention has been made to solve such a problem, and an object of the present invention is to provide a flow rate measuring device that improves measurement accuracy.
  • a flow rate measuring device is a flow rate measuring device that measures the flow rate of a fluid flowing through a fluid flow path unit, and is housed in the fluid flow path unit, and the inside thereof is in communication with the fluid flow path unit
  • the measurement channel part is provided.
  • a pair of sealing materials provided around the outer peripheral portion of the measurement channel section on one end side and the other end side to block fluid flow, a substrate on which the measurement circuit is mounted, and a pair of ultrasonic transmission / reception waves
  • a measuring unit including a measuring instrument includes a pair of ultrasonic transducers electrically and fixedly connected to the substrate, and is disposed between the pair of sealing materials in the measurement flow path section.
  • the present invention has an effect that the flow rate measuring apparatus having the above-described configuration and improving the measurement accuracy can be provided.
  • FIG. 1 is a schematic diagram showing a gas meter provided with a flow rate measuring device according to Embodiment 1 of the present invention.
  • FIG. 2 is an exploded perspective view showing the flow rate measuring device and the intermediate flow path portion of FIG.
  • FIG. 3 is a perspective view showing a state in which the measurement flow path portion of the flow rate measuring device of FIG. 2 is housed in the intermediate flow path portion.
  • FIG. 4 is a perspective view showing a state in which a substrate is attached to the measurement flow path portion of FIG.
  • FIG. 5 is a diagram showing a flow rate measuring apparatus according to Embodiment 2 of the present invention.
  • FIG. 6 is a diagram showing a substrate of the flow rate measuring device according to the third embodiment of the present invention.
  • the flow rate measuring device is a flow rate measuring device that measures the flow rate of the fluid flowing through the fluid flow path unit, and is housed in the fluid flow path unit, and the inside communicates with the fluid flow path unit.
  • a cylindrical measurement channel is provided.
  • a pair of sealing materials provided around the outer peripheral portion of the measurement channel section on one end side and the other end side to block fluid flow, a substrate on which the measurement circuit is mounted, and a pair of ultrasonic transmission / reception waves
  • a measuring unit including a measuring instrument Further, the measurement unit includes a pair of ultrasonic transducers electrically and fixedly connected to the substrate, and is disposed between the pair of sealing materials in the measurement flow path section.
  • the measurement circuit includes a propagation time measurement unit that measures a time during which the ultrasonic wave propagates between the pair of ultrasonic transducers, and a propagation time measurement unit. And an arithmetic unit that calculates the flow rate of the fluid based on the time measured by the above.
  • a positioning part may be provided in at least one of the measurement flow path part and the substrate.
  • a lead pin connected to the ultrasonic transducer may further be provided, and the lead pin may be inserted into the hole of the substrate.
  • the flow rate measuring device may further include an insulating damping unit that covers the substrate in the first aspect.
  • the pair of ultrasonic transducers may be arranged to face each other with the measurement flow path portion interposed therebetween.
  • the flow rate measuring device further includes a reflection part fixed to the substrate in the first aspect, and the pair of ultrasonic transducers sandwiches the measurement channel part between the reflection part. It may be arranged.
  • the fluid flow path unit is configured by sequentially connecting an inflow pipe part, an intermediate flow path part, and an outflow pipe part.
  • the passage portion is accommodated in the intermediate flow passage portion of the fluid flow passage portion.
  • One sealing material is provided so as to fill a space between the downstream end of the inflow pipe section and the outer peripheral portion on one end side of the measurement flow path section, and the other sealing material is provided between the upstream end of the outflow pipe section and the measurement flow path section. It may be provided so as to fill a space between the outer peripheral portion on the other end side.
  • FIG. 1 is a diagram schematically showing a gas meter 12 including a flow rate measuring device 10 according to the first embodiment.
  • gas is demonstrated as an example of a fluid below, other gas, such as air, and liquids, such as water, can be used as a fluid.
  • the flow rate measuring device that measures the flow rate of a fluid other than gas is the same as the flow rate measuring device 10 that measures the flow rate of gas, and thus the description thereof is omitted.
  • the gas meter 12 has a substantially rectangular parallelepiped shape (including a rectangular parallelepiped shape), and, for example, a display unit 14 is provided on the front surface thereof.
  • the gas meter 12 has an internal space, and a control circuit 16 and a fluid flow path portion 18 are provided in the internal space.
  • the control circuit 16 includes, for example, an integrated circuit (not shown) for wireless communication for transmitting information on the measured gas flow rate by wireless communication, an integrated circuit (not shown) for controlling each component, and A memory (not shown) for storing information is included.
  • the fluid flow path portion 18 is a pipe line that forms a fluid flow path, and includes an inflow pipe portion 20, an intermediate flow path portion 22, and an outflow pipe portion 24. Since the gas flows from the inflow pipe portion 20 through the intermediate flow path portion 22 to the outflow pipe portion 24, the gas is referred to as a relatively upstream side and a downstream side along the gas flow.
  • the inflow pipe part 20 includes a columnar internal space (inflow path), and the outflow pipe part 24 includes a columnar internal space (outflow path).
  • the inflow path of the inflow pipe section 20 and the outflow path of the outflow pipe section 24 extend parallel to each other in the internal space of the main body of the gas meter 12.
  • the upstream end of the inflow pipe part 20 and the downstream end of the outflow pipe part 24 are cylindrical and protrude upward from the main body.
  • the inflow pipe portion 20 has an upstream end connected to a gas pipe (not shown) connected to a gas supply source, and a downstream end connected to an inlet of the intermediate flow path portion 22.
  • the outflow pipe portion 24 has a downstream end connected to a gas pipe (not shown) connected to a gas consumer, and an upstream end connected to an outlet of the intermediate flow path portion 22. A gap between the downstream end of the inflow pipe portion 20 and the intermediate flow path portion 22 and a gap between the upstream end of the outflow pipe portion 24 and the intermediate flow path portion 22 are blocked by the filler 58. It is.
  • the intermediate flow path portion 22 is formed of a metal such as aluminum, for example.
  • the intermediate flow path part 22 is a container shape with an open top surface and has an internal space (intermediate flow path).
  • a region (inlet) surrounded by the upstream wall 22 a of the intermediate flow path portion 22 and the like of this opening faces the opening at the downstream end of the inflow pipe portion 20.
  • a region (outlet) surrounded by the downstream wall 22 b of the intermediate flow path portion 22 in the opening faces the opening at the upstream end of the outflow pipe portion 24.
  • the measurement flow path portion 26 is a hollow member that is open at both ends, and its internal space is used as a measurement flow path.
  • the measurement flow path portion 26 is configured by a cylindrical member having a rectangular cross section.
  • the length dimension of the measurement flow path portion 26 is smaller than the length dimension of the intermediate flow path portion 22. For this reason, between the upstream end of the measurement flow path part 26 and the upstream wall 22a of the intermediate flow path part 22, and between the downstream end of the measurement flow path part 26 and the downstream wall 22b of the intermediate flow path part 22, Each gap is provided.
  • the measurement flow path of the measurement flow path section 26 communicates with the fluid flow path of the intermediate flow path section 22 through this gap.
  • a plurality (5 in this embodiment) of rectifying plates 28 are arranged inside the measurement flow path portion 26.
  • the rectifying plate 28 extends along the axis of the measurement flow path portion 26 in parallel with the top plate 26 a and the bottom plate 26 b of the measurement flow path portion 26.
  • the measurement channel of the measurement channel unit 26 is partitioned in parallel by the rectifying plate 28.
  • Two first ribs 30 a and 30 b are provided on the outer surface of the top plate 26 a of the measurement flow path section 26, and the gas flow direction of the measurement flow path along the axis of the measurement flow path section 26 (hereinafter, “left-right direction”). ) Are provided at intervals.
  • two second ribs 32 a and 32 b are provided on the outer surface of the bottom plate 26 b of the measurement flow path portion 26 with an interval in the left-right direction.
  • the first rib (upstream first rib) 30a on the upstream side and between the two second ribs 32a, 32b, the second rib (upstream second rib) on the upstream side.
  • annular sealing materials 34a and 34b are arranged.
  • the pair of sealing materials 34a and 34b are attached to the measurement flow path section 26 with a gap in the left-right direction.
  • a sealing material (upstream sealing material) 34a on the upstream end side of the measurement flow path portion 26 is disposed in a gap between the upstream first rib 30a and the upstream second rib 32a.
  • a sealing material (downstream sealing material) 34b on the downstream end side of the measurement flow path portion 26 is disposed in a gap between the downstream first rib 30b and the downstream second rib 32b.
  • the sealing materials 34 a and 34 b are wound around the measurement flow path unit 26 in a direction perpendicular to the axis of the measurement flow path unit 26, and are provided around the outer periphery of the measurement flow path unit 26.
  • the thickness dimension of the sealing materials 34 a and 34 b is set to be equal to or larger than the gap dimension between the inner surface of the fluid flow path portion 18 and the outer surface of the measurement flow path portion 26.
  • This clearance for example, a clearance between the top plate 26a of the measurement flow path portion 26 and the downstream end of the inflow pipe portion 20 facing this, or the outflow facing the top plate 26a of the measurement flow path portion 26 and this. Examples include a gap between the upstream end of the pipe part 24 and a gap between the bottom part 22e of the intermediate flow path part 22 and the bottom plate 26b of the measurement flow path part 26.
  • the sealing materials 34a and 34b close the gap between the inner surface of the fluid flow path portion 18 and the outer surface of the measurement flow path portion 26, thereby blocking the gas flow.
  • the fluid flow path of the fluid flow path section 18 and the measurement flow path of the measurement flow path section 26 are connected while maintaining airtightness, and the gas flowing through the fluid flow path passes through the measurement flow path. That is, all of the gas flowing through the inflow pipe portion 20 flows out to the outflow pipe portion 24 through the measurement flow passage portion 26 without going to the outflow pipe portion 24 through the outside of the measurement flow passage portion 26.
  • the substrate 36 is disposed on the outer surface of the top plate 26a of the measurement flow path portion 26 between the pair of sealing materials 34a and 34b. Between the pair of sealing materials 34a and 34b, the top plate 26a is exposed from the opening of the intermediate flow path portion 22, and the substrate 36 is disposed here. In this exposed range, the gap between the fluid flow path portion 18 and the measurement flow path portion 26 is closed by the sealing materials 34a and 34b. Therefore, the gas in the fluid passage of the fluid passage portion 18 does not flow on the substrate 36 beyond the sealing materials 34a and 34b on the outer surface of the top plate 26a.
  • FIG. 2 is an exploded perspective view showing the flow rate measuring device 10 and the intermediate flow path portion 22.
  • the structure of the flow volume measuring apparatus 10 is demonstrated in detail.
  • the flow rate measuring device 10 includes a measurement flow path portion 26, a measurement unit 35, and sealing materials 34 a and 34 b.
  • the measurement unit 35 includes a substrate 36 and a pair of ultrasonic transducers 38.
  • the measurement channel section 26 has a cylindrical outer wall, and the outer wall has a top plate 26a, a bottom plate 26b facing the top plate 26a, and a pair of side plates 26c and 26d perpendicular to them.
  • the pair of first ribs 30a, 30b provided on the top plate 26a and the pair of second ribs 32a, 32b provided on the bottom plate 26b extend in parallel to each other in a direction perpendicular to the axis of the measurement flow path portion 26. ing.
  • a groove (upstream groove) 40a extending in the vertical direction is provided in each of the side plates 26c, 26d of the measurement flow path section 26.
  • a groove (downstream groove) 40b extending in the vertical direction is provided in each side plate 26c, 26d of the measurement flow path portion 26. .
  • the width dimension of these grooves 40a and 40b is set equal to the width dimension of the sealing materials 34a and 34b.
  • Sealing materials 34a and 34b are, for example, annular members having elasticity, and O-rings are used.
  • the sealing materials 34a and 34b should just fill between the outer wall of the fluid flow-path part 18 and the outer wall of the measurement flow-path part 26, and are not restricted to an O-ring.
  • a fixed sealing material other than O-ring, a paste-like amorphous sealing material, and the like can be used as the sealing materials 34a and 34b.
  • Openings 42a and 42b are provided in the side plates 26c and 26d of the measurement channel section 26, respectively.
  • One opening (upstream opening) 42a is disposed downstream of the upstream groove 40a and is located closer to the upstream groove 40a than the downstream groove 40b.
  • the other opening part (downstream opening part) 42b shown with a dashed line is distribute
  • the openings 42 a and 42 b penetrate the side plates 26 c and 26 d and are covered with the ultrasonic transmission film 44.
  • the ultrasonic transmission film 44 is a film that transmits ultrasonic waves and suppresses the passage of gas. For example, a mesh or the like is used. However, the openings 42 a and 42 b may not be covered with the ultrasonic transmission film 44.
  • a protrusion 46 is provided as a positioning portion of the substrate 36 on the outer surface of the top plate 26 a of the measurement flow path portion 26.
  • two columnar protrusions 46 protrude from the top plate 26a and are disposed between the pair of first ribs 30a and 30b.
  • One protrusion 46 is disposed in the vicinity of the upstream opening 42a, and the other protrusion 46 is disposed in the vicinity of the downstream opening 42b.
  • the substrate 36 is a thin plate-like body and has an elongated rectangular shape. Components such as electronic components and circuit elements are mounted on the surface of the substrate 36.
  • the components include a terminal 48 for connection to the control circuit 16 (FIG. 1) of the gas meter 12 (FIG. 1) and an integrated circuit (measurement circuit) 50 having a measurement function of the ultrasonic transducer 38.
  • the measurement circuit 50 has a propagation time measurement unit and a calculation unit.
  • the propagation time measurement unit measures the time during which the ultrasonic wave propagates between the pair of ultrasonic transducers 38.
  • the computing unit calculates the gas flow rate based on the time measured by the propagation time measuring unit.
  • the propagation time measurement unit and the calculation unit are realized by a program stored in the measurement circuit 50, for example.
  • the measurement circuit may be configured by one circuit having the functions of the propagation time measurement unit and the calculation unit, or two circuits individually having the function of the propagation time measurement unit and the function of the calculation unit.
  • two holes (positioning holes) 52 are opened in the substrate 36, and these positioning holes 52 are used as positioning portions for the measurement flow path portion 26 of the substrate 36.
  • the inner diameter dimension of the positioning hole 52 is larger than the outer dimension of the protrusion 46 of the measurement flow path portion 26, and the protrusion 46 can be inserted into the positioning hole 52.
  • a hole (insertion hole) 54 is further opened in the substrate 36, and in this embodiment, three insertion holes 54 are arranged at each end of the substrate 36.
  • the lead pin 56 of the ultrasonic transducer 38 is inserted into each insertion hole 54, and the ultrasonic transducer 38 is mounted on the back surface of the substrate 36.
  • the ultrasonic transducer 38 is electrically and fixedly connected to the substrate 36. That is, the lead pin 56 of the ultrasonic transducer 38 and the wiring on the substrate 36 are joined by solder. As a result, a current flows between them, so that the ultrasonic transducer 38 is electrically connected to the substrate 36.
  • the ultrasonic transducer 38 is directly fixed to the substrate 36, the ultrasonic transducer 38 is fixedly connected to the substrate 36 so that the ultrasonic transducer 38 and the substrate 36 have a fixed shape. It is integrated.
  • the ultrasonic transducer 38 includes a piezoelectric body (not shown), an acoustic matching body (not shown), and a terminal (not shown).
  • a piezoelectric body is an element that expands and contracts in the thickness direction when a voltage is applied, thereby converting electrical vibration into mechanical vibration.
  • the acoustic matching body has a radiation surface that radiates mechanical vibration generated by the piezoelectric body to the gas as ultrasonic waves.
  • the acoustic matching body is an element that matches the acoustic impedance of the piezoelectric body and the acoustic impedance of the gas in order to emit ultrasonic waves from the radiation surface.
  • Lead pins 56 are connected to terminals connected to the piezoelectric body.
  • the ultrasonic transducer 38 is electrically connected to the substrate 36 by soldering the lead pins 56 and the wiring on the substrate 36. Note that the ultrasonic transducer 38 and the substrate 36 may be electrically connected by a lead wire or the like instead of the lead pin 56.
  • the intermediate flow path portion 22 has an outer wall having a substantially rectangular parallelepiped shape (including a rectangular parallelepiped shape) whose top surface is open, and the outer wall includes an upstream wall 22a and a downstream side that are arranged to face each other in the gas flow direction. It has a wall 22b, a pair of side walls 22c and 22d opposed to each other in a direction orthogonal to the gas flow direction, and a bottom 22e. Fillers 58 are provided at the ends (opening-side ends) of the upstream wall 22a, the downstream wall 22b, and the side walls 22c, 22d, and the filler 58 continuously surrounds the periphery of the opening of the intermediate flow path portion 22.
  • the side walls 22c and 22d are provided with extended portions 60a and 60b, part of which protrudes outward.
  • the extended portions 60a and 60b form a triangular prism-shaped internal space (expanded space), and a part of the substantially rectangular parallelepiped-shaped fluid channel (including a rectangular parallelepiped shape) of the intermediate flow channel portion 22 is expanded by the expanded space.
  • the extended portion (upstream side extended portion) 60a of the side wall 22c is provided on the downstream side of the upstream first rib 30a, and more upstream than the downstream side first rib 30b than the extended portion (downstream side extended portion) 60b of the side wall 22d. Is provided.
  • the upstream side expansion part 60 a and the downstream side expansion part 60 b form a substantially rectangular parallelepiped space (including a rectangular parallelepiped shape) via the fluid flow path of the intermediate flow path part 22.
  • the cross section parallel to the bottom 22 e is rectangular, and the dimension of the rectangular cross section is set slightly larger than the dimension of the substrate 36.
  • a recess (upstream recess) 62a is provided upstream of the upstream extension 60a, and a recess (downstream recess) 62b is provided downstream of the downstream extension 60b.
  • the width of the fluid flow path of the intermediate flow path portion 22 is narrowed by these hollow portions 62a and 62b, and the width dimension is set to be substantially the same as the width dimension of the measurement flow path portion 26 fitted with the sealing materials 34a and 34b.
  • the dimension between the upstream dent part 62a and the downstream dent part 62b is set to be the same as the dimension between the upstream groove 40a and the downstream groove 40b.
  • the filler 58 may be provided on the recessed portions 62a and 62b.
  • FIG. 3 is a perspective view showing the intermediate flow path portion 22 containing the measurement flow path section 26 and the substrate 36.
  • FIG. 4 is a perspective view showing the measurement flow path portion 26 to which the substrate 36 is attached.
  • sealing materials 34 a and 34 b are fitted into the upstream groove 40 a and the downstream groove 40 b of the measurement flow path portion 26, respectively. Then, the measurement flow path portion 26 is accommodated in the intermediate flow path portion 22 so that the sealing materials 34 a and 34 b correspond to the recess portions 62 a and 62 b of the intermediate flow path portion 22. As a result, as shown in FIG. 3, the sealing materials 34 a and 34 b are in close contact with the outer surface of the measurement channel portion 26 and the inner surface of the intermediate channel portion 22, and the intermediate plates and the side plates 26 c and 26 d of the measurement channel portion 26.
  • the gap between the recesses 62a and 62b of the path portion 22 and the gap between the bottom plate 26b (FIG. 2) of the measurement flow path portion 26 and the bottom portion 22e (FIG. 2) of the intermediate flow path portion 22 are closed.
  • the sealing materials 34a and 34b With the sealing materials 34a and 34b, the measurement flow path section 26 and the intermediate flow path section 22 are hermetically partitioned into three spaces except for the top plate 26a side of the measurement flow path section 26.
  • the first is a fluid flow path (upstream intermediate flow path) between the upstream depression 62a and the upstream wall 22a.
  • the second is a fluid flow path (downstream intermediate flow path) between the downstream depression 62b and the downstream wall 22b.
  • the third is a fluid flow path (central intermediate flow path) between the upstream depression 62a and the downstream depression 62b.
  • This central intermediate flow is formed by the sealing materials 34a and 34b and the upstream intermediate flow and It is blocked from the downstream intermediate flow path.
  • the upstream intermediate flow path communicates with the measurement flow path of the measurement flow path section 26 through the opening at the upstream end of the measurement flow path section 26.
  • the downstream intermediate flow path communicates with the measurement flow path of the measurement flow path section 26 through the opening at the downstream end of the measurement flow path section 26.
  • the substrate 36 is mounted on the top plate 26 a of the measurement flow path portion 26 while the projection 46 of the measurement flow path portion 26 is inserted into the positioning hole 52 of the substrate 36.
  • the substrate 36 is disposed between the pair of sealing materials 34 a and 34 b and is fixed in close contact with the measurement channel portion 26.
  • the substrate 36 is within the range surrounded by the expansion portions 60a and 60b, and the ultrasonic transducer 38 fixed to the substrate 36 is inserted into the expansion space of the expansion portions 60a and 60b.
  • Each ultrasonic transducer 38 is disposed such that the path of the ultrasonic wave radiated from the radiation surface thereof is inclined at a predetermined angle with respect to the axis of the measurement flow path portion 26 through each of the openings 42a and 42b. .
  • the ultrasonic path is determined by the refractive index of air and gas.
  • the intermediate flow path portion 22 in which the measurement flow path portion 26 is stored is stored in the internal space of the gas meter 12.
  • the sealing materials 34a and 34b of the measurement flow path section 26 and the filler 58 of the intermediate flow path section 22 are in close contact with the downstream end of the inflow pipe section 20 and the upstream end of the outflow pipe section 24, respectively.
  • the flow path part 22 is disposed. Thereby, the inflow path of the inflow pipe part 20 and the upstream intermediate flow path of the intermediate flow path part 22 are connected, and the outflow path of the outflow pipe part 24 and the downstream intermediate flow path of the intermediate flow path part 22 are connected. .
  • the upstream intermediate flow path and the downstream intermediate flow path communicate with the measurement flow path, the inflow path, the upstream intermediate flow path, the measurement flow path, the downstream intermediate flow path, and the outflow path are in this order. Connected to form one U-shaped channel.
  • the substrate 36 is arranged on the outer surface of the measurement flow path section 26 between the inflow pipe section 20 and the outflow pipe section 24, it appears in the internal space of the gas meter 12. Therefore, the terminal 48 on the substrate 36 is connected to the control circuit 16 by a lead wire or the like, and the flow rate measuring device 10 is incorporated into the gas meter 12.
  • the gas pipe When measuring the flow rate of the gas flowing through the fluid flow path, the gas pipe is connected to each of the inflow pipe section 20 and the outflow pipe section 24.
  • the gas is supplied from the gas pipe, flows through the inflow path of the inflow pipe portion 20, and flows into the upstream intermediate flow path of the intermediate flow path portion 22.
  • the gas flows from the upstream intermediate flow channel through the opening at the upstream end of the measurement flow channel portion 26, passes through the measurement flow channel, and downstream through the opening at the downstream end of the measurement flow channel portion 26. It flows to the side intermediate flow path. Further, the gas enters the outflow path of the outflow pipe section 24 from the downstream intermediate flow path and flows to the gas pipe.
  • the ultrasonic transducer 38 converts the electrical signal into an ultrasonic wave. And radiate from the radiation surface.
  • the ultrasonic wave passes through the upstream opening 42a and enters the measurement channel, crosses the measurement channel obliquely, exits from the downstream opening 42b, and reaches the ultrasonic transducer 38 on the downstream side.
  • the ultrasonic transducer 38 on the downstream side receives the ultrasonic wave, converts it into electric vibration, and outputs it to the measurement circuit 50.
  • the difference between the time when the propagation time measurement unit outputs the electrical signal to the upstream ultrasonic transducer 38 and the time when the electrical signal is input from the downstream ultrasonic transducer 38 is calculated. Based on this, the propagation time of the ultrasonic wave is obtained. Similarly, ultrasonic waves are radiated from the downstream ultrasonic transducer 38, and the upstream ultrasonic transducer 38 receives the ultrasonic waves. Then, the propagation time measurement unit obtains the propagation time of this ultrasonic wave. Finally, the calculation unit calculates the gas flow rate based on the propagation time obtained by the propagation time measurement unit, and the measurement circuit 50 outputs the gas flow rate to the control circuit 16.
  • the control circuit 16 stores information on the acquired gas flow rate in a memory, displays the information on the display unit 14, and transmits the information to the outside using a wireless circuit and an antenna.
  • the ultrasonic transducer 38 can be electrically connected to the substrate 36 while being fixed.
  • the flow rate measuring device 10 can be reduced in size and workability can be improved.
  • the distance between the substrate 36 and the ultrasonic transducer 38 can be shortened and the generation of noise during this period can be reduced, the measurement accuracy of the flow rate measuring device 10 can be improved.
  • the substrate 36 is disposed on the measurement flow path portion 26, and an ultrasonic transducer 38 is directly fixed to the substrate 36. For this reason, it is not necessary to separately prepare a member for holding the substrate 36 and the ultrasonic transducer 38 in the measurement flow path section 26, so that the cost can be reduced and the gas meter 12 can be miniaturized. Moreover, the substrate 36 is exposed to the internal space of the gas meter 12 from the opening of the intermediate flow path portion 22 between the inflow pipe portion 20 and the outflow pipe portion 24. For this reason, the board
  • the substrate 36 can be easily attached to a predetermined position on the top plate 26a of the measurement flow path portion 26.
  • An ultrasonic transducer 38 is fixed to the substrate 36. That is, the separation distance and the orientation of the pair of ultrasonic transducers 38 have already been set in a state where they are attached to the substrate 36 before being arranged with the measurement flow channel interposed therebetween. For this reason, it is not necessary to adjust the position of the ultrasonic transducer 38 fixed to the substrate 36, and the workability at the time of arranging the ultrasonic transducer 38 with respect to the measurement channel is excellent.
  • the substrate 36 and the ultrasonic transducer 38 are integrated into a unit in advance. For this reason, when inspecting the quality of the flow measurement device 10 in which this measurement unit or measurement unit is mounted on the measurement flow path unit 26, the measurement unit or the flow measurement device 10 can be individually inspected. Therefore, the measurement unit or the flow rate measuring device 10 can be inspected in an environment suitable for quality inspection, and the inspection accuracy can be improved and simplified. Furthermore, before incorporating the measuring unit or the flow rate measuring device 10 into the gas meter, they can be inspected to find defective products at an early stage.
  • the measurement accuracy of the flow rate measuring device 10 is reduced by noise due to external vibration. Can be suppressed.
  • FIG. 5 is a diagram showing a flow rate measuring device 10 according to the second embodiment. As shown in FIG. 5, in the flow rate measuring device 10 according to the second embodiment, a pair of ultrasonic transducers 38 are arranged so as to sandwich the measurement flow path portion 26 between the reflection surface 64a.
  • Two extension portions 60a and 60b are provided on one side wall 22d of the intermediate flow path portion 22 so as to be spaced apart from each other. These extended portions 60a and 60b are disposed between the upstream dent portion 62a and the downstream dent portion 62b.
  • Two openings 42a and 42b are provided side by side with a gap in one side plate 26d of the measurement channel section 26.
  • One opening 42c is provided in the other side plate 26c, and this opening 42c is arranged between the two openings 42a and 42b.
  • a projection 46 is provided on the top plate 26 a of the measurement flow path portion 26 as a positioning portion for the substrate 36.
  • four columnar protrusions 46 protrude from the top plate 26a and are disposed between the pair of first ribs 30a and 30b.
  • the substrate 36 is a thin plate-like body and has a V shape.
  • the substrate 36 has an upstream end portion, a downstream end portion, and an intermediate end portion sandwiched therebetween.
  • the width dimension between the upstream end part and the downstream end part and the intermediate end part is set to be larger than the width dimension of the measurement flow path part 26.
  • An ultrasonic transducer 38 is electrically and fixedly connected to each of the upstream end portion and the downstream end portion by a lead pin 56 or the like, and the ultrasonic transducer 38 is disposed on the back surface of the substrate 36.
  • the reflection part 64 including the reflection surface 64 a is fixed to the intermediate end part, and the reflection part 64 is arranged on the back side of the substrate 36.
  • the ultrasonic transducer 38 and the reflector 64 are arranged so that the ultrasonic wave radiated from one ultrasonic transducer 38 is reflected by the reflection surface 64a and received by the other ultrasonic transducer 38. ing. Further, for example, four positioning holes 52 are opened in the substrate 36, and these positioning holes 52 are used as positioning portions of the substrate 36.
  • the sealing materials 34 a and 34 b are fitted into the measurement flow path portion 26 along the first ribs 30 a and 30 b.
  • the measurement flow path portion 26 is accommodated in the intermediate flow path portion 22 so that the sealing materials 34 a and 34 b correspond to the recess portions 62 a and 62 b of the intermediate flow path portion 22.
  • the projection 46 of the measurement flow path portion 26 is inserted into the positioning hole 52 of the substrate 36, and the substrate 36 is attached on the top plate 26 a of the measurement flow path portion 26.
  • the substrate 36 is disposed between the pair of sealing materials 34a and 34b, and the ultrasonic transducer 38 fixed to the substrate 36 is inserted into the expansion space of the expansion portions 60a and 60b of the measurement flow path portion 26.
  • the reflection portion 64 fixed to the substrate 36 is inserted between the side plate 26 c of the measurement flow path portion 26 and the side wall 22 c of the intermediate flow path portion 22.
  • the measurement flow path part 26 is disposed between the pair of ultrasonic transducers 38 and the reflection part 64.
  • the ultrasonic transducer 38 is disposed such that the ultrasonic path is inclined at a predetermined angle with respect to the axis of the measurement flow path portion 26.
  • the reflection part 64 is arrange
  • the intermediate flow path portion 22 in which the measurement flow path portion 26 is stored is stored in the internal space of the gas meter 12.
  • the ultrasonic transducer 38 When the flow rate of the gas flowing through the fluid flow path is measured by the flow rate measuring device 10, for example, when the measurement circuit 50 sends an electrical signal to the ultrasonic transducer 38 on the upstream side, the ultrasonic transducer 38 receives the electrical signal. Is converted into ultrasonic waves and emitted from the radiation surface. The ultrasonic wave passes through the upstream opening 42a and enters the measurement channel, crosses the measurement channel obliquely, passes through the opening 42c, and reaches the reflection surface 64a. Then, the ultrasonic wave is reflected by the reflecting surface 64a, passes again through the opening 42c, enters the measurement channel, crosses the measurement channel diagonally, exits from the downstream side opening 42b, and then enters the downstream side. It reaches the sonic transducer 38. The ultrasonic transducer 38 on the downstream side receives the ultrasonic wave, converts it into electric vibration, and outputs it to the measurement circuit 50.
  • the difference between the time when the propagation time measurement unit outputs the electrical signal to the upstream ultrasonic transducer 38 and the time when the electrical signal is input from the downstream ultrasonic transducer 38 is calculated. Based on this, the propagation time of the ultrasonic wave is obtained. Similarly, ultrasonic waves are radiated from the downstream ultrasonic transducer 38, and the upstream ultrasonic transducer 38 receives the ultrasonic waves. Then, the propagation time measurement unit obtains the propagation time of this ultrasonic wave. Finally, the calculation unit calculates the gas flow rate based on the propagation time obtained by the propagation time measurement unit.
  • FIG. 6 is a diagram showing the substrate 36 used in the flow rate measuring device 10 according to the third embodiment. As shown in FIG. 6, the flow rate measuring device 10 further includes an insulating vibration damping member 66.
  • the insulating damping member 66 is, for example, a thin film and covers the outer surface of the substrate 36. However, the insulating damping member 66 may cover a part of the outer surface of the substrate 36, or may cover the outer surface of the substrate 36 integrally with the outer surface of the piezoelectric body.
  • the insulating vibration damping member 66 is formed of a thermoplastic resin having a low glass transition point, such as a thermoplastic elastomer material or crystalline polyester.
  • the thermoplastic elastomer material include a styrene elastomer, an olefin elastomer, and a polyester elastomer.
  • the glass transition point of the thermoplastic resin is preferably ⁇ 30 ° C. or lower, for example, ⁇ 50 to ⁇ 90 ° C., which is the lowest temperature at which the flow rate is measured. Thereby, at the time of flow measurement, the insulating damping member 66 has rubber elasticity and can exhibit a damping function.
  • the melting point of the thermoplastic resin is preferably 80 ° C.
  • the Young's modulus of the thermoplastic resin is, for example, 0.1 to 1.0 GPa in the range from the lowest temperature to the highest temperature in flow measurement.
  • the insulating vibration damping member 66 covering the substrate 36 suppresses the substrate 36 from vibrating due to the vibration when one ultrasonic transducer 38 emits ultrasonic waves. For this reason, reverberation noise due to the vibration of the substrate 36 can be reduced. Further, it is possible to prevent vibration from propagating to the other ultrasonic transducer 38 via the substrate 36 and to reduce propagation noise. As a result, the measurement accuracy of the flow rate measuring device 10 can be improved.
  • the rectangular substrate 36 according to the first embodiment is covered with the insulating vibration damping member 66.
  • the V-shaped substrate 36 according to the second embodiment is covered with the insulating vibration damping member. 66 may be covered.
  • a “Z method” configuration is adopted in which a pair of ultrasonic transducers 38 are arranged to face each other.
  • a “V” configuration in which one reflecting surface 64 a is disposed between the pair of ultrasonic transducers 38 is employed.
  • the structure of another system can be adopted.
  • a “W” type configuration in which three reflecting surfaces 64 a are disposed between a pair of ultrasonic transducers 38 may be employed.
  • the entire top surface of the intermediate flow path portion 22 is open.
  • a part of the top surface of the intermediate flow path portion 22 may be opened.
  • the opening of the intermediate flow path portion 22 is covered with a lid, and an inflow port facing the inflow tube portion 20 and an outflow port facing the outflow tube portion 24 are opened in the lid.
  • the dimension between the lid and the top plate 26 a of the measurement channel part 26 accommodated in the intermediate channel part 22 is set to be larger than the thickness dimension of the substrate 36.
  • substrate 36 is fixed on the top plate 26a of the measurement flow-path part 26, and the board
  • sealing materials 34a and 34b close the gap between the lid and the measurement flow path portion 26, and the substrate 36 is disposed between the pair of sealing materials 34a and 34b. For this reason, the gas is prevented from flowing on the substrate 36 by the sealing materials 34a and 34b, and the occurrence of the malfunction of the substrate 36 due to the gas is suppressed.
  • the positioning hole 52 of the substrate 36 and the projection 46 of the measurement flow path portion 26 are provided as the positioning portion of the substrate 36, but the positioning portion is not limited to these.
  • the first ribs 30a and 30b of the measurement flow path portion 26 can be used as positioning portions.
  • the substrate 36 is disposed at a predetermined position of the measurement flow path portion 26 by applying the corners of the substrate 36 to the first ribs 30 a and 30 b.
  • the hollow parts 62a and 62b and the extended parts 60a and 60b of the intermediate flow path part 22 can also be used as positioning parts.
  • the measurement flow path portion 26 is accommodated in the intermediate flow path portion 22 so that the sealing materials 34a and 34b attached to the measurement flow path portion 26 correspond to the recessed portions 62a and 62b.
  • substrate 36 is attached to the measurement flow-path part 26 so that the ultrasonic transducer 38 may fit in the expansion parts 60a and 60b. Thereby, the substrate 36 can be positioned with respect to the measurement flow path portion 26 via the intermediate flow path portion 22.
  • the substrate 36 is directly fixed on the measurement flow path portion 26.
  • the substrate 36 may be indirectly fixed to the measurement flow path portion with an inclusion interposed between the measurement flow path portion 26 and the substrate.
  • the flow rate measuring device 10 of the present invention is useful as a flow rate measuring device 10 or the like that improves the measurement accuracy.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)
PCT/JP2015/000028 2014-01-09 2015-01-07 流量計測装置 Ceased WO2015105042A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US15/104,242 US9778084B2 (en) 2014-01-09 2015-01-07 Flow-rate measurement device
EP15735455.6A EP3093627B1 (en) 2014-01-09 2015-01-07 Flow-rate measurement device
CN201580004060.3A CN105899916A (zh) 2014-01-09 2015-01-07 流量测量装置

Applications Claiming Priority (2)

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JP2014002176A JP6191871B2 (ja) 2014-01-09 2014-01-09 流量計測装置
JP2014-002176 2014-01-09

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FR3111696B1 (fr) * 2020-06-19 2023-02-10 Integra Metering Sas Débitmètre et son procédé de montage
KR102557471B1 (ko) * 2023-01-04 2023-07-20 주식회사 대한계전 역류방지용 초음파 수도미터
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US20160377468A1 (en) 2016-12-29
CN105899916A (zh) 2016-08-24
EP3093627A4 (en) 2017-01-11
EP3093627A1 (en) 2016-11-16
US9778084B2 (en) 2017-10-03
JP2015129722A (ja) 2015-07-16
EP3093627B1 (en) 2019-01-02
JP6191871B2 (ja) 2017-09-06

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