JP4898723B2 - Multi-layer flow path member of ultrasonic fluid measuring device - Google Patents

Description

  The present invention relates to a multilayer flow path member of an ultrasonic fluid measurement device that forms a plurality of flat flow channels in a measurement flow channel of an ultrasonic fluid measurement device.

The ultrasonic fluid measurement device flows a fluid through a measurement channel, propagates the ultrasonic wave in 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 flow channel at a predetermined angle.
In recent years, in order to improve the measurement accuracy, an ultrasonic fluid measuring apparatus in which a plurality of partition walls are arranged in parallel in the measurement flow path and the measurement flow path is a multilayer flow path 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 is a problem that the measurement accuracy is lowered, and in order to perform highly accurate measurement, a highly accurate multilayer flow path member is required.

  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 a high-accuracy ultrasonic fluid measurement device that can improve fluid measurement accuracy.

  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 measuring device having a partition plate and a frame that supports an edge portion in the fluid flow direction in the partition plate, and flows along the end surface of the partition plate, It has the structure which has a holding means which hold | maintains the position of the said partition plate with respect to the said frame by solidifying in that state.

  With this configuration, the holding means for attaching the partition plate constituting the multilayer flow path member of the ultrasonic fluid measuring device to the frame flows along the end face of the partition plate, so that it penetrates between the partition plate and the frame. Solidify while holding the position positioned by the jig. As a result, the spacing between the partition plates can be maintained with high accuracy, so that a simple configuration can be achieved without increasing the manufacturing accuracy of the frame for mounting the partition plates and without using a separate member for ensuring dimensional accuracy. Thus, a highly accurate multilayer flow path member can be formed.

  Moreover, in the multilayer flow path member of the ultrasonic fluid measuring device of the present invention, the holding means is configured to be an adhesive.

  With this configuration, the adhesive as the holding means flows along the end face of the partition plate and permeates between the partition plate and the frame, for example, with the partition plate in a state where the position positioned by the jig is held. The frame can be bonded and fixed at a desired position with high accuracy.

  Moreover, in the multilayer flow path member of the ultrasonic fluid measurement device of the present invention, the holding means is configured to be a part of the frame that is softened following the end face and then solidified.

  With this configuration, a part of the frame is softened and flows along the end face of the partition plate, penetrates between the partition plate and the frame, and then solidifies to form a part of the frame again. It can be fixed with high accuracy to the positioned frame position.

  In the multilayer flow path member of the ultrasonic fluid measuring device of the present invention, the holding means has a configuration in contact with at least one of the front surface and the back surface of the partition plate.

  With this configuration, at least one of the front and back surfaces of the partition plate is in contact with and supported, so that the partition plate is securely held by the frame.

  Moreover, in the multilayer flow path member of the ultrasonic fluid measuring device of the present invention, the frame has a configuration in which a through hole through which the end face of the partition plate is exposed is provided.

  With this configuration, it is possible to inject adhesive into the exposed end face of the partition plate from the through hole provided in the frame or to act as a means for softening a part of the frame, so that the partition plate can be fixed easily. Become.

  Moreover, in the multilayer flow path member of the ultrasonic fluid measuring device of the present invention, a plurality of the through holes are provided according to the number of the partition plates.

  With this configuration, since the through holes are provided according to the number of partition plates, it is possible to inject adhesive or the like for each partition plate, and to securely fix each partition plate to the frame.

  Further, in the multilayer flow path member of the ultrasonic fluid measuring device of the present invention, a flange is provided at an edge of the partition plate that is orthogonal to the flow direction, and the flange is fixed by the holding means. It has the composition which is.

  With this configuration, since the flange portion protruding outward from the partition plate is fixed to the frame, it is possible to minimize the protrusion of the holding means in the flow path inside the frame and prevent the fluid flow from being disturbed. Highly accurate measurement can be performed.

  In the present invention, since the holding means for attaching the partition plate constituting the multilayer flow path member of the ultrasonic fluid measuring device to the frame flows following the end face of the partition plate, the penetration means penetrates between the partition plate and the frame. Solidify while holding the position positioned by the jig. As a result, the spacing between the partition plates can be maintained with high accuracy, so that a simple configuration can be achieved without increasing the manufacturing accuracy of the frame for mounting the partition plates and without using a separate member for ensuring dimensional accuracy. Therefore, it is possible to provide a multilayer flow path member of an ultrasonic fluid measuring device having an effect that a highly accurate multilayer flow path member can be formed.

Hereinafter, a multilayer flow path member of an ultrasonic fluid measuring device according to an embodiment of the present invention will be described with reference to the drawings.
1 is an overall perspective view showing an example of an ultrasonic fluid measuring device using a multilayer flow path member according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. 4 is an exploded perspective view of the road member, FIG. 4 is a cross-sectional view of the IV-IV position in FIG. 3, FIGS. 5A to 5C are explanatory views showing the manufacturing process of the multilayer flow path member, and FIGS. D) is a cross-sectional view showing a joined state of the partition plate and the frame.

  As shown in FIG. 1, the ultrasonic fluid measuring apparatus 1 includes, for example, left and right vertical flow paths 3a and 3b and a horizontal flow path 4 that connects the upper ends of the left and right vertical flow paths 3a and 3b. The fluid passage 2 is formed in a substantially inverted U shape. The horizontal flow path 4 has a square-tube-shaped measurement flow path 4a whose upper surface for measuring a fluid is opened, and a pair of opposed inner surfaces 5a and 5b in the measurement flow path 4a are respectively connected to a transducer. An ultrasonic measuring unit 9 having (not shown) is provided. Furthermore, the measurement channel 4a includes a multilayer channel member 10 that divides the fluid into a plurality of flat channels, and a lid 7 that accommodates the multilayer channel member 10 in the measurement channel 4a and seals it. Therefore, when the lid 7 is put on the horizontal flow path 4, the measurement flow path 4a is formed in a rectangular tube shape having a rectangular cross section.

  Note that the ultrasonic propagation path 8b in the measurement direction connecting the transducers is provided so as to obliquely intersect the fluid flowing direction. In this way, the arrangement pattern in which the ultrasonic wave propagation path 8b is arranged opposite to the flow with an angle is called a Z path (Z-path) or a Z method. This Z path arrangement will be exemplified.

  The side walls 6a and 6b of the horizontal flow path 4 are respectively provided with triangular transducer mounting portions 8 and 8 protruding outward. For example, a circular through hole 8a penetrating in the direction connecting the both transducer attachment parts 8 and 8 is provided in the both transducer attachment parts 8 and 8 and the side walls 6a and 6b. Is formed.

  A multilayer channel member mounting portion 4b is provided inside the measurement channel 4a of the horizontal channel 4, and a step 4c for fitting the multilayer channel member 10 from above is provided. Each step 4 c is provided with an inclined surface 4 d for smoothly continuing to the inner surface of the frame 12 of the multilayer flow path member 10 and the inner surfaces 5 a and 5 b of the horizontal flow path 4.

  As shown in FIGS. 2 and 3, the multilayer flow path member 10 includes a partition plate 11 for partitioning the measurement flow path 4 a into a plurality of flat flow paths 4 e, and an edge along the fluid flow direction in the partition plate 11. And a frame 12 that supports the portion 11a. That is, the frame 12 is formed in a rectangular box shape by the left and right side plates 13, 14, the top plate 15 and the bottom plate 16, and the partition plate 11 is held horizontally at a predetermined interval between the left and right side plates 13, 14.

  As shown in FIG. 3, a plurality of slits 17 are provided on the inner surfaces of the side plates 13 and 14 in order to hold the partition plate 11 at a predetermined interval. The slits 17 are equally spaced along the direction perpendicular to the fluid flow (vertical direction in FIGS. 2 and 3) so that the cross-sectional areas of the flat flow paths 4e partitioned by the partition plates 11 are uniform. Is provided.

  Further, as shown in FIGS. 1 and 3, the multilayer flow path member 10 positioned in the ultrasonic wave propagation path 8b in a state where the multilayer flow path member 10 is fitted to the multilayer flow path member mounting portion 4b of the measurement flow path 4a. The side plates 13 and 14 of the frame 12 are provided with openings 18 for passing ultrasonic waves. A filter member 19 such as a fine mesh punching metal that can transmit ultrasonic waves but does not allow fluid to pass through is attached to the opening 18.

As shown in FIG. 3, the partition plate 11 is an overall rectangular thin plate member, and the edge portion 11 a of the partition plate 11 is provided with a plurality of flange portions 11 b. The eaves part 11b can be provided, for example, protruding from the four corners and the central part of the partition plate 11 outward in the width direction.
On the other hand, the slit 17 provided in the side plates 13 and 14 of the frame 12 is provided with a through hole 21 at a position corresponding to the flange portion 11b of the partition plate 11, and the partition plate 11 of the partition plate 11 is passed through the through hole 21 from the outside. The end face 11c is exposed (see FIG. 4). Since the through hole 21 is provided for each flange 11b, the adhesive 33 can be easily injected when the flange 11b is fixed to the frame 12.

Next, the manufacturing method of the multilayer flow path member 10 mentioned above is demonstrated.
As shown in FIG. 5A, first, in the jig 30, a pair of holding portions 31a and 31b having slits 32 set at a desired interval between the partition plates 11 are arranged so that the slits 32 face each other.

  As shown in FIG. 5B, the longitudinal end portions 11d and 11d of each partition plate 11 are inserted and held in the slits 32 of the holding portions 31a and 31b arranged to face each other. The positions and widths of the slits 32 of the holding portions 31a and 31b are set to the intervals and thicknesses of the partition plates 11 with higher accuracy than the slits 17 provided on the side plates 13 and 14 of the frame 12. The partition plate 11 is positioned with high accuracy. Therefore, by inserting the partition plate 11 into the slit 32, the partition plate 11 is set with high accuracy.

  Next, as shown in FIG. 5C, the side plates 13 and 14 of the frame 12 are brought close to the side end face 11 c of the partition plate held by the jig 30, and the slits 17 of the side plates 13 and 14 are inserted into the slits 17 of the side plate 13. Insert the edge 11a. At this time, each flange portion 11 b provided in the partition plate 11 is fitted into the through hole 21 provided in the slit 17. Since the slits 17 and the through holes 21 of the side plates 13 and 14 are formed with a margin as compared to the slit 31a of the holding portion 31, the partition plate 11 can be easily inserted.

  Next, for example, an adhesive is injected from the through holes 21 of the side plates 13 and 14 as a holding means. The adhesive flows along the end surface 11 c of the partition plate 11 and solidifies while being accurately positioned by the jig 30. Here, since the collar part 11b is accommodated in the through hole 21, the collar part 11b can be fixed to the through hole 21 so that the adhesive does not protrude into the measurement flow path 4a. The flow of the fluid flowing through the path 4e can be made smooth.

  When the adhesive is solidified, the top plate 15 and the bottom plate 16 are attached to the upper and lower sides of the side plates 13 and 14 to form the frame 12, and the multilayer flow path member 10 is completed. The top plate 15 and the bottom plate 16 can be bonded using an adhesive or the like. However, the upper and lower end surfaces of the side plates 13 and 14 and the top plate 15 and the bottom plate 16 are provided with fitting portions to be fitted. Can be assembled.

  It should be noted that without using an adhesive, ultrasonic waves or heat treatment is performed through the through-hole 21 to melt a part of the frame 12 as a holding means, and it is made to flow along the end surface 11c of the partition plate 11 and then solidified. It is also possible to attach the partition plate 11 by welding.

  As described above, according to the multilayer flow path member 10 of the ultrasonic fluid measuring apparatus described above, the adhesive 33 for attaching the partition plate 11 constituting the multilayer flow path member 10 to the frame 12 follows the end surface 11c of the partition plate 11. Since it flows, it permeates between the partition plate 11 and the frame 12 and solidifies in a state where the position positioned by the jig 30 is maintained. Thereby, since the space | interval of the partition plate 11 can be hold | maintained with high precision, without using the separate member for ensuring the dimensional accuracy, without raising the manufacture precision of the flame | frame 12 which attaches the partition plate 11, A highly accurate multilayer flow path member 10 can be formed with a simple configuration.

Note that the multilayer flow path member of the ultrasonic fluid measurement device of the present invention is not limited to the above-described embodiment, and can be appropriately modified and improved.
For example, in the above-described embodiment, the case where the flange portion 11b protruding in the width direction of the partition plate 11 is provided and the flange portion 11b is joined to the side plates 13 and 14 of the frame 12 has been described, but the flange portion 11b is provided. Instead, the end surface 11 c of the partition plate 11 may be joined to the frame 12.
In this case, as shown in FIG. 6A, the bonding state between the partition plate 11 and the side plates 13 and 14 of the frame 12 is the same as that of the adhesive 33 (when a part of the frame is used as the holding means). However, the end surface 11c of the partition plate 11 and the inner surfaces of the side plates 13 and 14 can be brought into contact with each other. Alternatively, as shown in FIGS. 6B to 6D, the upper and lower surfaces of the partition plate 11 or both upper and lower surfaces can be supported.

1 is an overall perspective view showing an example of an ultrasonic fluid measuring device using a multilayer flow path member according to an embodiment of the present invention. Sectional view at II-II position in Fig. 1 Exploded perspective view of multilayer channel member Sectional view at position IV-IV in Fig. 3 (A)-(C) is explanatory drawing which shows the manufacturing process of a multilayer flow-path member. (A)-(D) is sectional drawing which shows the joining state of a partition plate and a flame | frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ultrasonic fluid measuring device 4a Measurement flow path 4e Flat flow path 10 Multi-layer flow path member 11 Partition plate 11b Gutter part 11c End surface 12 Frame 21 Through-hole 33 Adhesive (holding means)

Claims (7)

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 frame has a side plate provided with a slit having an insertion margin for inserting the edge of the partition plate;
The frame flows by following the end face of the partition plate in a state where the edge of the partition plate is inserted into the slit, and penetrates between the partition plate and the frame and solidifies in that state. A multilayer flow path member for an ultrasonic fluid measuring device, characterized by comprising holding means for holding the position of the partition plate with respect to. It said retaining means, Ri adhesive der, the adhesive, and wherein following the partition plate end face of the flow, the partition plate is obtained by solidifying while maintaining the state of being accurately positioned The multilayer flow path member of the ultrasonic fluid measuring device according to claim 1.   The multilayer flow path member for an ultrasonic fluid measuring device according to claim 1, wherein the holding means is a part of the frame that is softened along the end face and then solidifies.   The multilayer flow path of the ultrasonic fluid measuring device according to any one of claims 1 to 3, wherein the holding means is in contact with at least one of a front surface and a back surface of the partition plate. Element.   The multilayer flow path member of the ultrasonic fluid measuring device according to any one of claims 1 to 4, wherein the frame is provided with a through hole through which the end face of the partition plate is exposed.   The multilayer flow path member of the ultrasonic fluid measuring device according to claim 5, wherein a plurality of the through holes are provided according to the number of the partition plates.   The flange part is provided in the edge part orthogonal to the said flow direction in the said partition plate, The said flange part is being fixed by the said holding means, The Claim 1 thru | or 6 characterized by the above-mentioned. The multilayer flow path member of the ultrasonic fluid measuring device.

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