JP2009014658A - Multi-layer flow path member of ultrasonic fluid measuring device and ultrasonic fluid measuring device - Google Patents

Abstract

A multilayer flow path member of an ultrasonic fluid measuring device and an ultrasonic fluid measuring device capable of improving the measurement accuracy of an average flow velocity.
A multi-layer flow path member 30 arranged in a rectangular tube-shaped measurement flow path 14a of an ultrasonic fluid measuring device 10 is divided into a plurality of flat flow paths by a partition plate 32 attached to a frame 31 along the flow direction. When partitioning into 14e, it provided so that the partition plate 32 might face the inner surfaces 15f and 17a of the measurement flow path 14a. For this reason, since the partition plate 32 is exposed and faces the inner surfaces 15f and 17a of the measurement flow path 14a, the flatness between the exposed partition plate 32 and the inner surfaces 15f and 17a of the measurement flow path 14a is the uppermost or lowermost step. It becomes the flow path 14e. Therefore, unlike the conventional case, there is no problem that the fluid flows between the frame 31 constituting the multilayer flow path member 30 and the inner surfaces 15f and 17a of the measurement flow path 14a, thereby reducing the measurement accuracy. Accuracy can be improved.
[Selection] Figure 1

Description

  The present invention relates to a multilayer flow path member and an ultrasonic fluid measurement apparatus of an ultrasonic fluid measurement apparatus in which a plurality of flat flow paths are formed in a measurement flow path by a multilayer flow path member.

An ultrasonic fluid measurement device flows a fluid through a measurement channel, propagates the ultrasonic wave into the measurement channel, measures the propagation time of the ultrasonic wave, and obtains the flow velocity of the fluid based on the measured information. Is.
This measurement channel has a rectangular tube shape with a rectangular cross section, and a pair of transmission / reception units are provided on the opposing short side surfaces.

The pair of transmission / reception units are arranged so as to transmit and receive ultrasonic waves along a line that intersects the flow direction of the measurement channel at a predetermined angle.
In recent years, in order to improve the measurement accuracy, an ultrasonic fluid measurement device in which a plurality of partition walls are arranged in parallel in the measurement channel and the measurement channel is a multilayer channel has been proposed. (For example, refer to Patent Document 1).
International Publication No. 04/074783 Pamphlet

  However, when the measurement flow path is a multilayer flow path, if both edges of the partition plate for forming the multilayer flow path are supported by the frame, the fluid flows between the frame and the inner surface of the measurement flow path. There was a problem of reducing measurement accuracy.

  The present invention has been made to solve the conventional problems, and it is an object of the present invention to provide a multilayer flow path member of an ultrasonic fluid measuring device and an ultrasonic fluid measuring device that can improve the measurement accuracy of the average flow velocity.

  The multilayer flow path member of the ultrasonic fluid measurement device of the present invention is disposed in a rectangular tube-shaped measurement flow channel formed in the ultrasonic fluid measurement device, and divides the measurement flow channel into a plurality of flat flow channels. A multilayer flow path member of an ultrasonic fluid measurement device having a partition plate and a frame that supports an edge portion in the fluid flow direction in the partition plate, wherein the partition plate is disposed on an inner surface of the measurement flow channel. It has the structure which faces.

  With this configuration, when the multilayer flow path member disposed in the rectangular tubular measurement flow path of the ultrasonic fluid measurement device is partitioned into a plurality of flat flow paths by the partition plate attached to the frame along the flow direction. The partition plate was provided so as to face the inner surface of the measurement channel. For this reason, since the partition plate is exposed and faces the inner surface of the measurement channel, a flat channel at the uppermost or lowermost stage is formed between the exposed partition plate and the inner surface of the measurement channel. Therefore, unlike the conventional case, there is no problem that the fluid flows between the frame constituting the multilayer flow path member and the inner surface of the measurement flow path, thereby reducing the measurement accuracy, thereby improving the measurement accuracy of the average flow velocity. it can.

  Moreover, the multilayer flow path member of the ultrasonic fluid measurement apparatus of the present invention has a configuration in which the partition plate faces a pair of opposed inner surfaces in the measurement flow path.

  With this configuration, since the partition plate faces both of the pair of inner surfaces of the measurement channel, the measurement accuracy can be further improved.

  Furthermore, the multilayer flow path member of the ultrasonic fluid measuring device of the present invention has an extension portion provided at an end portion of the frame along the flow direction, and an inner surface of the extension portion is an inner side of the frame. It has the structure which cross | intersects with respect to the side surface.

  With this configuration, since the extension portion having the inclined surface is provided on the frame, the fluid can be smoothly guided into the multi-layer flow path, and the fluid can be smoothly sent out of the multi-layer flow path. For this reason, the flow of the fluid in measuring the fluid becomes uniform, and the measurement accuracy of the average flow velocity can be improved.

  Furthermore, the multilayer flow path member of the ultrasonic fluid measuring device of the present invention has a configuration in which a water repellent treatment is applied to a filter member that is provided in the through hole of the frame and transmits ultrasonic waves.

  With this configuration, since the water repellent treatment is applied to the filter member, the fluid hitting the filter member is repelled and clogging by the fluid is less likely to occur, so that the measurement accuracy can be improved.

  Furthermore, the ultrasonic fluid measurement device of the present invention is an ultrasonic wave in which a measurement channel formed in a rectangular tube shape having a rectangular cross section, and a first transducer and a second transducer are provided in the measurement channel. A measurement unit, a partition plate accommodated in the measurement flow path so as to be substantially parallel to an ultrasonic wave propagation path connecting the first transducer and the second transducer, and fluid in the partition plate An ultrasonic fluid measurement device comprising: a multi-layer flow path member having a frame that supports an edge along a flow direction; and a plurality of flat flow paths formed in the measurement flow path by the multi-layer flow path member. And it has the structure by which the inclined surface which continues to the inner surface of the said measurement flow path and continues to the inner surface of the said flame | frame is provided.

  With this configuration, a plurality of flat flow is provided by a partition plate attached to a frame along the flow direction in a rectangular tube-shaped measurement channel provided with an ultrasonic measurement unit having a first transducer and a second transducer. When providing the multilayer flow path member partitioned into the paths, an inclined surface continuous to the measurement flow path and the inner surface of the frame was provided. For this reason, the fluid can be smoothly guided into the multi-layer flow path, and the fluid can be smoothly sent out of the multi-layer flow path, so that the flow of the fluid in the measurement of the fluid becomes uniform and the measurement accuracy of the average flow velocity is improved. be able to.

  The present invention provides a multilayer flow path member arranged in a rectangular tube-shaped measurement flow path of an ultrasonic fluid measurement device when dividing into a plurality of flat flow paths by a partition plate attached to a frame along the flow direction. The partition plate was provided so as to face the inner surface of the measurement channel. For this reason, since the partition plate is exposed and faces the inner surface of the measurement channel, a flat channel at the uppermost or lowermost stage is formed between the exposed partition plate and the inner surface of the measurement channel. Therefore, unlike the conventional case, there is no problem that the fluid flows between the frame constituting the multilayer flow path member and the inner surface of the measurement flow path, and the measurement accuracy is not deteriorated, thereby improving the measurement accuracy. It is possible to provide a multilayer flow path member and an ultrasonic fluid measuring device of the ultrasonic fluid measuring device having the above.

Hereinafter, a multilayer flow path member and an ultrasonic fluid measurement device of an ultrasonic fluid measurement device according to an embodiment of the present invention will be described with reference to the drawings.
1 is a perspective view of an ultrasonic fluid measuring device and a multilayer flow path member according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a horizontal flow path, and FIG. 3 is a perspective view of a multilayer flow path member. 4 is a cross-sectional view taken along the line IV-IV in FIG.

  As shown in FIG. 1, the ultrasonic fluid measurement device 10 according to the first embodiment includes a horizontal flow that connects left and right vertical flow paths 12 and 13 and upper ends of the left and right vertical flow paths 12 and 13. The fluid passage 11 is formed in a substantially inverted U shape with the passage 14. The horizontal flow path 14 has a measurement flow path 14a for measuring a fluid, and a pair of opposed inner surfaces 15a and 15b in the measurement flow path 14a are each a first transducer (here, a transmitter). An ultrasonic measurement unit 20 having 21 and a second transducer (here, a receiver) 22 is provided. Furthermore, the measurement flow path 14a has a multilayer flow path member 30 that divides the fluid into a plurality of flat flow paths, and a lid 17 that houses the multilayer flow path member 30 in the measurement flow path 14a and seals it. Therefore, when the lid 17 is put on the horizontal flow path 14, the measurement flow path 14a is formed in a rectangular tube shape having a rectangular cross section.

  The ultrasonic propagation path 23 in the measurement direction connecting the first transducer 21 and the second transducer 22 is provided so as to cross obliquely with respect to the fluid flow direction. As described above, the arrangement pattern arranged at an angle with respect to the flow such as the first and second transducers 21 and 22 is called the Z path (Z-path) or the Z method. In this embodiment, this Z path arrangement is illustrated.

  As shown in FIGS. 1 and 2, side wall 16 a, 16 b of the horizontal flow path 14 is provided with triangular transducer mounting portions 18, 18 protruding outward. For example, a circular through hole 18a penetrating in the direction connecting the two transducer attachment portions 18 and 18 is provided in both the transducer attachment portions 18 and 18 and the side walls 16a and 16b. Is formed. Note that a first transducer 21 is attached to one transducer attachment portion 18, and a second transducer 22 is attached to the other transducer attachment portion 18.

  A multilayer channel member mounting portion 14b is provided inside the measurement channel 14a of the horizontal channel 14, and a step 14c for fitting the multilayer channel member 30 from above is provided. Each step 14 c is provided with an inclined surface 14 d for smoothly continuing to the inner surface 31 a of the frame 31 of the multilayer flow path member 30 and the inner surfaces 15 a and 15 b of the horizontal flow path 14.

  As described above, when the multilayer flow path member 30 is provided in the rectangular tubular measurement flow path 14 a provided with the ultrasonic measurement unit 20 having the first transducer 21 and the second transducer 22, the measurement flow path is provided. 14a and the inclined surface 14d continuous to the inner side surface 31a of the frame 31 are provided, so that the fluid can be smoothly guided into the multilayer flow path member 30 and the fluid can be smoothly sent out from the multilayer flow path member 30. Thereby, the flow of the fluid in the measurement of the fluid becomes uniform, and the measurement accuracy of the average flow velocity can be improved.

  As shown in FIG. 3, the multilayer flow path member 30 supports a partition plate 32 for partitioning the measurement flow path 14a into a plurality of flat flow paths 14e, and an edge along the fluid flow direction in the partition plate 32. And a frame 31 to be operated. That is, as shown in FIG. 4, the frame 31 is disposed along the left and right inner surfaces 15 a and 15 b of the horizontal flow path 14, and the partition plate 32 is horizontally supported between the frames 31 and 31. At this time, at the upper end portion and the lower end portion of the horizontal flow path 14, the partition plate 32 directly contacts the bottom surface 14 f of the measurement flow path 14 a and the lower surface 17 a of the lid 17 that constitute the inner surface (here, the upper and lower surfaces) of the measurement flow path 14 a. Try to face each other.

  The partition plate 32 is desirably set so that the cross-sectional area of the flat flow path 14e partitioned by each partition plate 32 is uniform. Further, the lower end surface of the frame 31 is in contact with the bottom surface 14f of the measurement channel 14a, and the upper end surface of the frame 31 is in contact with the lower surface 17a of the lid 17, so that the cross-sectional areas of the lowermost and uppermost flat channels 14e It is desirable to make it uniform. Moreover, it is desirable to arrange the partition plate 32 so as to be substantially parallel to the ultrasonic wave propagation path 23 connecting the first transducer 21 and the second transducer 22.

  As shown in FIGS. 2 to 4, the frame 31 of the multilayer flow path member 30 located in the ultrasonic wave propagation path 23 with the multilayer flow path member 30 fitted in the multilayer flow path member mounting portion 14 b of the measurement flow path 14 a. Is provided with a through-hole 31b for passing ultrasonic waves. A filter member 33 such as a fine mesh punching metal that does not allow fluid to pass through but allows ultrasonic waves to pass therethrough is attached to the notch 31b. The filter member 33 is subjected to a water repellent treatment. ing. For this reason, the fluid hitting the filter member 33 is repelled and clogging due to the fluid is less likely to occur, so that the measurement accuracy can be improved.

Here, “water repellency” refers to the property of “repelling water” rather than “preventing water penetration” like waterproofing. As a water repellent treatment, for example,
1: Plasma is generated under atmospheric pressure, and a water repellent polymer is generated on the surface of the material by polymerization.
2: An ultra-thin film of fluorine is provided on the material surface.
3: A nanoscale functional film is formed on the surface of the material by organic thin film treatment. Etc. can be exemplified.

  As described above, according to the multilayer flow path member 30 described above, since the partition plate 32 faces the bottom surface 14f of the measurement flow path 14a and the lower surface 17a of the lid 17, the partition plate 32 is exposed and the measurement flow path 14a. 14b and the lower surface 17a of the lid 17, the space between the exposed partition plate 32 and the bottom surface 14f of the measurement channel 14a and the lower surface 17a of the lid 17 is the flat channel 14e at the uppermost or lowermost level. For this reason, as in the prior art, fluid flows between the frame 31 constituting the multilayer flow path member 30 and the bottom surface 14f of the measurement flow path 14a and the lower surface 17a of the lid 17 to cause a problem that the measurement accuracy is lowered. Accordingly, the measurement accuracy of the average flow velocity can be improved. In addition, since the lowermost and uppermost partition plates 32, 32 face both the bottom surface 14f of the measurement flow path 14a and the lower surface 17a of the lid 17, the fluid flows through the uppermost and lowermost flat flow paths 14e. It can flow smoothly and the measurement accuracy can be further improved.

Next, a multilayer flow path member and an ultrasonic fluid measurement device of an ultrasonic fluid measurement device according to a second embodiment of the present invention will be described.
FIG. 5 is a perspective view of the multilayer flow path member according to the second embodiment, and FIG. 6 is a cross-sectional view of the multilayer flow path member according to the second embodiment. In addition, the same code | symbol is attached | subjected to the site | part which is common in the multilayer flow-path member and ultrasonic fluid measuring device of the ultrasonic fluid measuring device which concerns on 1st Embodiment mentioned above, and the overlapping description is abbreviate | omitted. .

  As shown in FIGS. 5 and 6, the multilayer flow path member 30 </ b> B according to the second embodiment has an extension portion 34 provided at an end portion along the flow direction in the frame 31 </ b> B. The inner side surface 34 a intersects the inner side surface 31 a of the frame 31. Therefore, as shown in FIG. 6, the extension portion 34 can be inclined with respect to the left and right inner surfaces 15a and 15b of the measurement flow path 14a and smoothly connected to the inner surface of the frame 31B. Accordingly, the fluid can be smoothly guided into the multilayer flow path member 30B, and the fluid can be smoothly sent out of the multilayer flow path member 30B. Therefore, the flow of the fluid in the measurement of the fluid becomes uniform, and the average flow velocity is measured. Accuracy can be improved. When the multilayer flow path member 30B according to the present embodiment is used, it is not necessary to provide the inclined surface 14d of the horizontal flow path 14 in the first embodiment described above, and the structure of the measurement flow path 14a is simple. Become.

Next, a multilayer flow path member and an ultrasonic fluid measurement device of an ultrasonic fluid measurement device according to a third embodiment of the present invention will be described.
FIG. 7 is a perspective view of the multilayer flow path member according to the third embodiment, and FIG. 8 is an exploded perspective view of the main part of the ultrasonic fluid measuring device according to the third embodiment. In addition, the same code | symbol is attached | subjected to the multilayer flow path member of the ultrasonic fluid measuring device which concerns on 1st Embodiment mentioned above, and 2nd implementation mobile phone, and an ultrasonic fluid measuring device, and the overlapping description is carried out. It will be omitted.

  As shown in FIGS. 7 and 8, in the multilayer flow path member 30C according to the third embodiment, the bottom portion 35 is provided at the lower end of the frames 31B and 31B described above in the second embodiment, and the U-shaped cross section is formed. Formed. For this reason, the flat flow path 14 e is also formed between the lowermost partition plate 32 and the bottom 35. Further, on the lower surface 35 a of the bottom portion 35, for example, a columnar positioning projection 36 is provided, and a positioning recess 37 in which the projection 36 is fitted in the measurement channel 14 a in the horizontal channel 14 of the channel body 11 is provided. Thereby, the multilayer flow path member 30C can be reliably arranged at a predetermined position.

  Note that the multilayer flow path member and the ultrasonic fluid measurement device of the ultrasonic fluid measurement device of the present invention are not limited to the above-described embodiments, and appropriate modifications and improvements can be made.

  As described above, the multilayer flow path member of the ultrasonic fluid measurement device and the ultrasonic fluid measurement device according to the present invention are arranged in the square cylindrical measurement flow channel of the ultrasonic fluid measurement device. When the member was partitioned into a plurality of flat channels by a partition plate attached to a frame along the flow direction, the member was provided so that the partition plate faces the inner surface of the measurement channel. For this reason, since the partition plate is exposed and faces the inner surface of the measurement channel, a flat channel at the uppermost or lowermost stage is formed between the exposed partition plate and the inner surface of the measurement channel. Therefore, unlike the conventional case, there is no problem that the fluid flows between the frame constituting the multilayer flow path member and the inner surface of the measurement flow path, and the measurement accuracy is not deteriorated, thereby improving the measurement accuracy. And is useful as a multilayer flow channel member and an ultrasonic fluid measurement device of an ultrasonic fluid measurement device in which a plurality of flat flow channels are formed in a measurement flow channel by a multilayer flow channel member.

1 is a perspective view of an ultrasonic fluid measurement device and a multilayer flow path member according to a first embodiment of the present invention. Cross section of horizontal channel Perspective view of multilayer channel member Sectional view at position IV-IV in Fig. 2 The perspective view of the multilayer channel member concerning a 2nd embodiment Sectional drawing of the multilayer flow-path member which concerns on 2nd Embodiment The perspective view of the multilayer channel member concerning a 3rd embodiment The principal part disassembled perspective view of the ultrasonic fluid measuring device according to the third embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ultrasonic fluid measuring device 14a Measurement flow path 14d Inclined surface 14e Flat flow path 14f Bottom face (inner surface of measurement flow path)
17a bottom surface (inner surface of measurement channel)
DESCRIPTION OF SYMBOLS 20 Ultrasonic measurement part 21 1st transmitter / receiver 22 2nd transmitter / receiver 23 Ultrasonic propagation path 30 Multilayer flow path member 31 Frame 31a Inner side surface 31b Through-hole 32 Partition plate 33 Filter member 34 Extension part

Claims (5)

A partition plate arranged in a rectangular tubular measurement channel formed in the ultrasonic fluid measurement device, and partitioning the measurement channel into a plurality of flat channels;
A multilayer flow path member of an ultrasonic fluid measuring device having a frame that supports an edge portion in the fluid flow direction in the partition plate,
The multilayer flow path member of an ultrasonic fluid measurement apparatus, wherein the partition plate faces an inner surface of the measurement flow path.   The multilayer flow path member of an ultrasonic fluid measuring device according to claim 1, wherein the partition plate faces a pair of opposed inner surfaces in the measurement flow path. An extension provided at an end of the frame along the flow direction;
The multilayer flow path member for an ultrasonic fluid measuring device according to claim 1, wherein an inner surface of the extension part intersects an inner surface of the frame.   The multilayer flow path member of the ultrasonic fluid measuring device according to claim 1, wherein a water repellent treatment is applied to a filter member provided in the through hole of the frame and transmitting ultrasonic waves. A measurement channel formed in a rectangular tube with a rectangular cross section;
An ultrasonic measurement unit in which a first transducer and a second transducer are provided in the measurement channel;
A partition plate accommodated in the measurement flow path so as to be substantially parallel to an ultrasonic wave propagation path connecting the first transducer and the second transducer, and along a fluid flow direction in the partition plate A multi-layer flow path member having a frame that supports the edge portion,
An ultrasonic fluid measurement device in which a plurality of flat channels are formed in the measurement channel by the multilayer channel member,
An ultrasonic fluid measuring device characterized by being provided with an inclined surface that is continuous with the inner surface of the measurement channel and is continuous with the inner surface of the frame.

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