JP5277911B2 - Fluid flow measuring device - Google Patents

Abstract

A highly accurate fluid measuring flow path device capable of measuring a fluid with improved accuracy. The fluid measuring flow path device is provided with partition plates (13) for partitioning a measuring flow path into flat flow paths (7), side plates (14, 15) for supporting both edges of each of the partition plates (13), a multilayer flow path member (8) composed of a top plate (16) and a bottom plate (17) which are provided above and below the partition plates (13) so as to be parallel to the partition plates (13) and are joined to the side plates (14, 15) to support both edges of each of the side plates, a containing section (6) for containing the multilayer flow path member (8) through the opening in the upper part of the containing section, and a lid section (9) for closing the opening.  A projection (20) deformed by external force is provided to either the containing section (6) including the lid section (9) or the multilayer flow path member (8), and the multilayer flow path member (8) is affixed to the containing section (6) by deformation of the projection (20).

Description

  The present invention relates to a fluid measurement channel device having a plurality of flat channels.

  For example, an ultrasonic flow meter measures the flow rate by measuring the fluid flow rate using the ultrasonic wave propagation time between the ultrasonic transducers placed on the upstream and downstream sides of the fluid flowing in the measurement channel. Met.

  This measurement channel has a rectangular shape with a rectangular cross section, and an ultrasonic handset is provided on the opposite short side, and the ultrasonic wave transmitted from one ultrasonic handset is used for the measurement flow. The fluid flowing through the path is obliquely crossed and received by the other ultrasonic handset.

In recent years, in order to improve the measurement accuracy, a plurality of partition walls are arranged in parallel in the measurement channel, and the measurement channel is a multilayer channel (see, for example, Patent Document 1). ).

Various improvements have also been proposed when the measurement channel is used as a multilayer channel. For example, as shown in FIG. 8, a convex portion 102 that also serves as a seal ring is formed on the outer surface of the measurement flow channel 101, and a concave portion 104 is provided at an opposite portion of the storage member 103. By fitting 102, the measurement flow path 103 is positioned and fixed in the storage member 103, and simplification of the assembly work is promoted (see, for example, Patent Document 2).
International Publication No. 2004/074783 Pamphlet JP 2006-053067 A

  However, when the measurement flow path is a multilayer flow path, the positional relationship between the pair of transmission / reception units provided in the measurement flow path and the multilayer flow path that divides the measurement flow path into laminar flow paths, and There is a problem that the measurement accuracy is reduced due to the dimensional variation between the partition plates when both edges of the partition plate for forming the multilayer flow path are supported by the frame. There is a need for an accurate multilayer channel member.

  In addition, a convex portion is formed on the outer surface of the measurement flow channel, and a concave portion is formed on the opposing surface of the storage member, and the convex portion is fitted into the concave portion during assembly work. During the work, there was a problem that dimensional variations occurred in the concave and convex portions, and the dimensional accuracy of fitting the measurement flow channel into the storage member was lowered.

  Therefore, the fluid flowing through the measurement channel is also affected, and high accuracy measurement may not be possible.

  The present invention has been made to solve the conventional problems, and provides a fluid measurement flow path device that improves the measurement accuracy of a fluid.

In order to achieve the above object, a fluid measurement flow path device of the present invention includes a partition plate that divides a measurement flow path into a plurality of flat flow paths, and a side plate that is orthogonal to the partition plate and supports both edges. A multi-layer flow path member which is arranged in parallel with the partition plate and is connected to the side plate to support both edges and a bottom plate; and a multi-layer flow path member having an upper opening. a housing portion which is adapted to accommodate through, the a closing lid opening, housing portion containing the lid or Rutotomoni provided with a projection portion that deforms by external force to one of the multilayer flow path member, the A groove is formed around the protruding portion, and the multilayer flow path member is fixed to the accommodating portion including the lid portion by deformation of the protruding portion.

  As described above, by providing the accommodating portion including the lid portion or the protruding portion deformed by the external force on one of the multilayer flow path members, the multilayer flow path member can be fixed to the accommodating portion accurately and without rattling. .

  According to the present invention, it is possible to fix the multilayer flow path member to the housing portion accurately and without backlash, and therefore it is possible to improve the fluid measurement accuracy and promote the efficiency of the mounting operation.

The present invention provides a partition plate that divides a measurement channel into a plurality of flat channels, a side plate that is orthogonal to the partition plate and supports both edge portions, and is disposed above and below in parallel with the partition plate, A multi-layer flow path member composed of a top plate and a bottom plate that are coupled to support both edge portions, a storage section configured to receive the multi-layer flow path member through an upper opening, and the opening being closed a lid portion, housing portions including the lid, or Rutotomoni provided with a projection portion that deforms by external force to one of the multilayer flow path member, protruding to form a groove around the raised portion, the deformation of the protrusion A multilayer flow path member is fixed to a housing portion including the lid portion.

  As described above, by providing the accommodating portion including the lid portion or the protruding portion deformed by the external force on one of the multilayer flow path members, the multilayer flow path member can be fixed to the accommodating portion accurately and without rattling. .

  The protrusion is preferably formed at the end of the side plate constituting the multilayer flow path member. By doing so, the stress accompanying the deformation of the protrusion is applied in the width direction of the side plate, and no deformation or the like occurs.

  Further, if the projecting portion is formed in a tapered shape, the projecting portion is accurately deformed, and the workability can be further improved.

  In addition, by forming a groove around the protrusion, the deformation of the protrusion is absorbed by the groove.

  A protrusion is formed at the end of the side plate constituting the multilayer flow path member, and a recess is formed at a portion corresponding to the protrusion of the housing portion including the lid, and the volume of the recess is larger than the volume of the protrusion. It may be possible to set a smaller value. Also in this case, the deformation of the protrusion is absorbed by the recess.

  Preferably, positioning convex portions and holes to be fitted to each other are formed separately in the accommodating portion including the lid portion and the multilayer flow path member.

  Accordingly, the displacement due to the deformation of the protrusion is prevented by the fitting of the protrusion and the hole, and the accuracy of attaching the multilayer flow path member to the housing portion can be further enhanced.

  Further, by forming the convex portion and the hole at the left-right asymmetric position, it is possible to prevent left-right reverse mounting.

  By mounting these fluid measurement channel devices on an ultrasonic flow meter, it is possible to achieve high-precision measurement of flow rate and the like.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
1 to 4 show a case where the ultrasonic flow meter 1 is implemented as Embodiment 1, and the fluid path 2 includes left and right vertical channels 3a and 3b and a horizontal channel 4 connecting them. It is formed in a substantially inverted U shape.

  The horizontal flow path 4 has a rectangular rectangular cross section, an upper surface is opened, and an accommodating portion 6 in which ultrasonic transmitter / receiver mounting portions 5a and 5b are formed on opposing side walls.

  The accommodating portion 6 accommodates a multilayer flow path member 8 composed of a plurality of flat flow paths 7, and an opening on the upper surface is sealed with a lid portion 9.

  Therefore, the fluid that has flowed into the vertical flow path 3a is diverted to the plurality of flat flow paths 7 of the multilayer flow path member 8, and then flows and flows out to the vertical flow path 3b.

  An ultrasonic wave propagation path 12 is formed by providing ultrasonic passage ports 10 and 11 on the side wall of the accommodating portion 6 and the multilayer flow path member 8 corresponding to the ultrasonic transmitter / receiver mounting portions 5a and 5b.

  The ultrasonic wave propagation path 12 is formed so as to obliquely cross the fluid flowing in the laminar flow state in the flat flow path 7 of the multilayer flow path member 8.

  Thus, the arrangement pattern in which the ultrasonic wave propagation paths 12 are formed obliquely is called a so-called Z path (Z-path) or Z method. In the present embodiment, this Z path arrangement is illustrated. To do.

  As shown in FIGS. 2 and 3, the multilayer flow path member 8 includes a plurality of partition plates 13 for partitioning into a plurality of flat flow paths 7, and edge portions 13 a along the fluid flow direction in these partition plates 13. The side plates 14 and 15 to be supported, the top plate 16 and the bottom plate 17 are formed in a rectangular box shape, and the partition plate 13 is horizontally held at a predetermined interval between the left and right side plates 14 and 15.

  More specifically, a plurality of slits 18 are provided on the opposing inner surfaces of the side plates 14 and 15 to hold the partition plate 13 at a predetermined interval.

  These slits 18 are provided at equal intervals along the upper and lower sides perpendicular to the fluid flow so that the cross-sectional areas of the flat flow paths 7 partitioned by the respective partition plates 13 are uniform.

  The ultrasonic passage port 11 formed on the side wall of the multilayer flow path member 8 is provided with a filter member 19 such as a fine mesh or punching metal that can transmit ultrasonic waves.

  The partition plate 13 is an overall rectangular thin plate-like member, and a plurality of flange portions 13b are provided on the edge portion 13a.

These flanges 13b are provided so as to protrude outward in the width direction from the four corners and the center of the partition plate 13, for example.

  On the other hand, the slit 18 provided in the side plates 14 and 15 is provided with a through hole 18a at a position corresponding to the flange 13b of the partition plate 13, and the end surface of the flange 13b is exposed to the outside through the through hole 18a. It has become.

  Now, tapered projections 20 with small diameters are formed integrally on the front and rear sides of the side plates 14 and 15, respectively, and the bottom wall of the housing 6 and the lid 9 are opposed to these projections 20. A recess 21 is formed.

  The volume of the recess 21 is larger than the volume of the protrusion 20, and the height of the protrusion 20 is set to be greater than the depth of the recess 21.

  Further, a positioning convex portion 22 is disposed in the vicinity of the top plate 14 and the protruding portion 20 of the bottom plate 15, and the bottom wall and the lid portion 9 of the housing portion 6 are opposed to the convex portion 22. A recess 23 is formed.

  Here, since the multilayer flow path member 8 is accommodated in the accommodating portion 6 of the measurement flow path 2 and sealed with the lid portion 9, there is no gap around the multilayer flow path member 8. However, since the fluid flow in the ultrasonic wave propagation path 12 is measured as a representative value, the amount of fluid flowing outside the multilayer flow path member 6 and the fluid flowing in the flat flow path 7 are measured. The balance of the quantity and the positional relationship of the multilayer flow path member 8 forming the ultrasonic wave propagation path 12 are important.

  That is, if the multilayer flow path member 8 has rattling or the surrounding gaps vary, the fluid flow measurement accuracy is affected, so that the fluid flow in the ultrasonic propagation path 12 is stabilized. Therefore, when the multilayer flow path member 8 is accommodated in the accommodating portion 6 and sealed with the lid portion 9, the multilayer flow path member 8 must be firmly fixed.

  In the present embodiment, as shown in FIG. 4, when the multilayer flow path member 8 is accommodated in the accommodating portion 6 and sealed with the lid portion 9, the concave portion 21 and the protruding portion 20 inserted therein are Since the height of 20> the depth of the recess 21 is set, each tip of the protrusion 20 is in a deformed state. Therefore, the multilayer flow path member 8 is fixed to the housing portion 6 so as not to move. It is possible to prevent rattling and the like at a low cost with a simple configuration without using any parts.

  Further, since the volume of the protrusion 20 is smaller than the volume of the recess 21, it does not protrude from the recess 21 even if the protrusion 20 is deformed, and protrudes between the housing 6 and the outer wall of the multilayer flow path member 8. There is no worry that the accommodating portion 6 and the lid portion 9 will not be pinched, and the fixing can be performed without being affected by the dimensional variation, and the gap between the accommodating portion 6 and the accommodated multilayer flow path member 8 is formed. It becomes possible to set small.

  Since the protrusion 20 is deformed, the position regulation is likely to be unstable, and the protrusion 20 needs a play portion for the deformation allowance, so that it is difficult to improve the dimensional accuracy. The concave portions 23 are formed in the bottom wall of the housing portion 6 and the lid portion 9 so as to be opposed to the convex portions 22, so that the obstruction of positioning is eliminated by this. Thus, the assemblability can be improved.

  Further, when the multilayer flow path member 8 is accommodated in the accommodating portion 6 and sealed with the lid portion 9, since the protrusion 20 is tapered, there is no fear that the tip is buckled and broken from the root, and the multilayer flow member is eliminated. The road member 8 can be fixed so as not to move reliably, and the force for sealing is reduced.

  And since the projection part 20 is formed in the edge part orthogonal to the plane direction of the side plates 14 and 15, the multilayer flow path member 8 does not deform | transform with the stress at the time of the deformation | transformation. The fixing force by the part 20 is also improved, and the multilayer flow path member 8 can be fixed securely.

(Embodiment 2)
FIG. 5 shows the second embodiment, and the same reference numerals are given to the components that perform the same operations as those in FIG. 4, and those of the first embodiment are used for specific description.

  The difference from the first embodiment is that an annular groove 32 is provided around the protrusion 31 and lower than the protrusion 31, the volume of the protrusion 31 is smaller than the volume of the groove 32, and the lid The recessed part into which the projection part 31 fits is not formed in the side of the accommodating part 6 including the part 9.

  In the above configuration, when the multilayer flow path member 8 is accommodated in the accommodating portion 6 and sealed with the lid portion 9, the protrusion 31 is deformed so that the multilayer flow path member 8 accommodated in the accommodating portion 6 does not move. It can be fixed.

  And since the volume of the projection part 31 is made smaller than the volume of the groove part 32, even if it deform | transforms, there is no worry of protruding. Therefore, there is no concern that the protruding portion is sandwiched between the accommodating portion 6 and the lid portion 9 and the accommodating portion 6 and the lid portion 9 do not get stuck, and it can be fixed without being affected by dimensional variations. It becomes possible to set a small gap between the accommodating portion 6 and the accommodated multilayer flow path member 9.

  In the second embodiment, the groove portion 32 is provided around the protrusion portion 31 and the recess portion into which the protrusion portion 31 is fitted is not formed on the side of the housing portion 6 including the lid portion 9, but as shown in FIG. Even if the recess 21 is provided as in the first embodiment, the same effect can be obtained. According to this, the groove 32 of the protrusion 31 and the deformation allowance of the protrusion 31 can be dispersed by the recess 21. And the recessed part 21 can be made small.

  In addition, the alignment portion of the first and second embodiments is disposed at the center of the multilayer flow path member 8, but this is effective when the accommodation direction of the multilayer flow path member 8 has no directionality. If there is directionality in the direction, as shown in FIG. 7, if the number of alignment parts is changed or the shape is asymmetrical so that it cannot be installed in the opposite direction, an installation error will occur. Can be prevented.

  Further, when the multilayer flow path member 8 is accommodated in the accommodating portion 6 and sealed with the lid portion 9, the protrusions 20 and 31 are deformed and fixed to the accommodating portion 6 so that the multilayer flow path member 8 does not move. Although described in the configuration, in addition to this, the multi-layer flow path is positioned in the vicinity of the protrusions 20 and 31 so that the outer periphery of the multi-layer flow path member 8 and the gap between the accommodating section 6 and the lid section 9 are regulated to be constant. You may make it provide the step part (not shown) of alignment in the outer periphery of the member 8, or either the accommodating part 6 and the cover part 9. As shown in FIG.

  According to this, when the multilayer flow path member 8 is accommodated and the accommodating portion 6 and the lid portion 9 are sealed, the projecting portions 20 and 31 can be deformed until they contact the wall surface facing the step portion. The gap between the outer periphery of the multilayer flow path member 8 and the accommodating portion 6 and the lid portion 9 can be regulated to a constant level, and the deformation allowance of the projecting portions 20 and 31 can be controlled to obtain a stable fixing force. Will be able to.

  Moreover, although the projection parts 20 and 31 were provided in the multilayer flow path member 8 side, conversely, forming in the accommodating part 6 side containing the cover part 9 is also considered.

  As described above, the fluid measuring flow path device according to the present invention has a simple configuration and can fix the multilayer flow path member while preventing rattling, so that high reliability can be obtained. When applied to a flow meter, it enables high-precision measurement.

1 is an overall exploded perspective view of an ultrasonic flow meter according to Embodiment 1 of the present invention. Sectional drawing of the principal part of the flow-path apparatus for fluid measurement in Embodiment 1 of this invention Exploded perspective view of the fluid measurement channel device Assembly work explanatory diagram Assembly work explanatory drawing in Embodiment 2 of this invention Assembly work explanatory diagram showing another example in the second embodiment Cross-sectional view of main parts showing still another example of the second embodiment Sectional view of the main part of a conventional fluid measurement channel device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ultrasonic fluid measuring device 6 Accommodating part 7 Flat flow path 8 Multilayer flow path member 9 Lid part 13 Partition plate 14,15 Side plate 16 Top plate 17 Bottom plate 20,31 Protrusion part 21,32 Recessed part

Claims (7)

A partition plate that divides the measurement flow path into a plurality of flat flow paths;
A side plate orthogonal to the partition plate and supporting both edges;
A multi-layer flow path member which is arranged in parallel with the partition plate, and is composed of a top plate which is coupled to the side plate and supports both edges, and a bottom plate;
An accommodating portion adapted to accommodate the multilayer flow path member through an upper opening;
A lid for closing the opening;
Housing portion containing the lid or Rutotomoni provided with a projection portion that deforms by external force to one of the multilayer flow path member, a groove is formed around the protrusion portion, accommodating including the lid by deformation of the protrusion A fluid measuring channel device in which a multilayer channel member is fixed to a portion. A partition plate that divides the measurement flow path into a plurality of flat flow paths;
A side plate orthogonal to the partition plate and supporting both edges;
A multi-layer flow path member which is arranged in parallel with the partition plate, and is composed of a top plate which is coupled to the side plate and supports both edges, and a bottom plate;
An accommodating portion adapted to accommodate the multilayer flow path member through an upper opening;
A lid for closing the opening;
A projection on the end of the side plate constituting the multilayered flow passage member, the recess in the portions corresponding to the protrusions of the housing portion including the cover portion is formed respectively, and the volume of the recesses of the projections A fluid measurement channel device that is set to be larger than the volume, and a multilayer channel member is fixed to a housing portion including the lid by deformation of the projection . 3. The fluid measuring channel device according to claim 1, wherein a protrusion is formed at an end of the side plate constituting the multilayer channel member. The fluid measuring flow path device according to any one of claims 1 to 3, wherein the protrusion is configured in a tapered shape. The fluid measuring flow path device according to any one of claims 1 to 4, wherein a positioning convex part and a hole to be fitted to each other are formed separately in the housing part including the lid part and the multilayer flow path member. 6. The fluid measuring flow path device according to claim 5, wherein the convex portion and the hole are formed in a laterally asymmetric position. Ultrasonic flow measurement meter with the fluid measuring channel device according to any one of claims 1-6.

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