JP4893754B2 - Channel device for fluid measurement and ultrasonic flow meter using the same - Google Patents

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 flow path, whereby the measurement flow path is formed as a multilayer flow path (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. 10, 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 a portion facing 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 measuring flow path device of the present invention accommodates a multilayer flow path member in which a measurement flow path is divided into a plurality of flat flow paths via a partition plate, and the multilayer flow path member. accommodating portion includes a fluid passage having a to, as well as projecting the bead portion from an outer periphery of the multilayer flow path member in the circumferential direction, from the housing inner wall of the fluid path corresponding to the bead portions, recessed and concave stripes the bead portion is fitted, further to form a protrusion is deformed by an external force to a portion of the bead portion, fixing the multilayer flow path member in the housing portion by deformation of the protrusion It is what you do.

Thus, by providing the protrusion is deformed by an external force to the bead portion, exactly, and which yet are fixed multilayer flow path member relative without backlash accommodating portion.

  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 comprises a multilayer flow path member in which a measurement flow path is partitioned into a plurality of flat flow paths via a partition plate, and a fluid path having an accommodating portion for accommodating the multilayer flow path member, and the multilayer flow path together from the outer periphery of the member to project the bead portion in the circumferential direction, from the housing inner wall of the fluid path corresponding to the bead portions, recessed a concave stripes the bead portion is fitted, further wherein a portion of the bead portion to form a protrusion is deformed by an external force, but which is adapted to secure the multilayer flow path member in the housing portion by deformation of the protrusion.

Thus, by providing the protrusion is deformed by an external force to the bead portion, exactly, yet it can be fixed in the multilayer flow path member relative without backlash accommodating portion, also, the external force is received by the bead portion Therefore, deformation or the like does not occur in the multilayer flow path member.

Wherein is the cross-sectional shape and the housing portion of the multilayer flow path member and the fluid passage is set in a rectangular shape, protrusions formed on both sides of the corner portion of the bead portion.

Therefore, external force with is received by the bead portion, because the stress is applied in the longitudinal direction of the bead portion, and it can be prevented even more reliably deformation of the multilayer flow path member.

Specifically, protrusions it is preferable to form each of the portions corresponding to the longitudinal direction of the rectangular frame-shaped bead portion.

Bead portion is also conceivable to form plural rows in the longitudinal direction of the multilayer flow path member. In this case, if recessed a concave of plural rows in the housing portion of the fluid path corresponding to an individual and these bead portions, even if there is a gap and housing portion and the multilayer flow path member, it meander In other words, a labyrinth is formed, and the flow of fluid through the gap can be suppressed as much as possible.

By forming the bead portion and the concave in the longitudinal direction asymmetric position of the multilayer flow path member and the accommodating portion, it can prevent reverse with the multilayer flow path member of the housing portion, on the contrary, be formed in the longitudinal direction symmetrically In this case, the directionality at the time of attachment can be eliminated.

Furthermore, specifically, a partition plate that divides the measurement channel into a plurality of flat channels, a side plate that is orthogonal to the partition plate and supports both edges, and is arranged vertically in parallel with the partition plate, A multi-layer channel member composed of a top plate and a bottom plate coupled to the side plate and supporting both edges; a housing unit configured to house the multi-layer channel member through an upper opening; and comprising a fluid passage having a lid for closing the opening, as well as projecting the bead portion from an outer periphery of the multilayer flow path member in the circumferential direction, a housing portion of the fluid path corresponding to the bead portion lid from the inner wall of the part, recessed a concave stripes the bead portion is fitted, and further forming a protrusion is deformed by an external force to a portion of the bead portion, the receiving portion by deformation of the protrusion The multi-layer flow path member is fixed to.

  If these fluid measurement channel devices are used in an ultrasonic flow meter, the flow velocity and / or flow rate of the fluid can be measured with high accuracy.

  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 7 show a case where the ultrasonic flow meter 1 is implemented as the first embodiment, and the fluid path 2 made of aluminum die casting includes left and right vertical flow paths 3a and 3b and these. The horizontal flow path 4 to be connected 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 is composed of a plurality of flat flow passages 7 and accommodates a multi-layer flow passage member 8 having a rectangular cross section as a whole, and an opening on the upper surface is sealed with a lid portion 9.

  The multilayer flow path member 8 is molded from a synthetic resin such as butyethylene terephthalate or polyethylene terephthalate filled with glass fiber.

  The fluid that has flowed into the vertical flow path 3a is divided into a 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.

The multilayer channel member 8 includes a plurality of partition plates 13 for partitioning into a plurality of flat channels 7, side plates 14 and 15 that support edge portions 13a along the fluid flow direction in these partition plates 13, and these The top plate 16 and the bottom plate 17 joined to the inside of the side plates 14 and 15 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.

Well, Yes and the outer peripheral surface longitudinal center bead portions 20, 21 of the two rows in the multilayer flow path member 8 is integrally formed continuously in the circumferential direction, while the receiving section 6 and the horizontal channel 4 the lid 9 for closing the upper opening concave 22 Paragraph said bead portions 20, 21 is fitted are recessed.

The one bead portion 20 of the multilayer flow path member 8, bead member 20a which is integrally formed on the side plates 14, 15, and 20b, bead member 20c which is integrally formed in the top plate 16 and bottom plate 17, and 20d those obtained by connecting the frame-like, also, the other bead portion 21, bead members 21a which is integrally formed in the side plates 14, 15, and 21b, bead member which is integrally formed in the top plate 16 and bottom plate 17 21c and 21d are connected in a frame shape.

Then, one of the bead member 20a which is integrally formed in the side plates 14 and 15, upper and lower ends of 20b is protrude from the upper and lower edges of the side plates 14 and 15, their one Bee top plate 16 and bottom plate 17 on the inside de member 20c, both ends of 20d are joined, also, the top plate 16 and the bottom plate other bead member 21c which is integrally formed in 17, 21d both ends notch 23 through the same top plate of the side plates 14, 15 of the 16 and projecting laterally of the bottom plate 17, the other bead member 21a of the side plates 14 and 15, on the 21b, are to be joined to the lower end.

One bead member 20a projecting from the upper and lower edge of the side plates 14 and 15, upper and lower ends of 20b is formed in a concave shape, a pin-like projection 24 from the bottom portion are protruded. The protrusion 24 is set so as pop one bead member 20c, which bead member 20c in greater than the height of the 20d of the top plate 16 and the bottom plate 17, from 20d to the outside.

Furthermore, the other bead member 21c of the top plate 16 and bottom plate 17, both end portions of the 21d, i.e., the portion that protrudes to the side of the top plate 16 and bottom plate 17 via the cutout 23 of the side plates 14 and 15 Further, a triangular protrusion 26 is provided with a gap 25 therebetween. The bead member 21a of the height of the projections 26 the side plates 14 and 15, is set to larger than that of 21b.

  In the above configuration, the incorporation of the multilayer flow path member 8 into the fluid path 2 will be described.

First, the multilayer flow path member 8 is inserted from the upper open part of the storage part 6. At this time, fulfill bead member 20a which projects from the side plate 14, 15 of the multilayered flow passage member 8 in concave 22 formed on both the inner wall of the housing part 6, 20b, and 21a, and 21b are fitted guiding action Therefore, the insertion work is made smoothly, bead member 20d to the concave 22 that is present on the inner bottom surface and projecting from the bottom plate 17 of the multilayer flow path member 8 of the housing part 6, the insertion work where 21d took crowded fits Is completed.

  Next, the lid portion 9 may be provided so as to cover the upper open portion of the storage portion 6.

Incidentally, when inserting the multilayer flow path member 8 from the upper opening of the housing part 6, the top plate 16, lateral bead member 21c of the bottom plate 17, 21d triangular formed at both ends of the high protrusion portion 26 bead member 21a Saga side plates 14 and 15, in order is set to larger than that of 21b, and thus be transformed into the respective apex portion collapsing.

Also, the storage unit 6 if the multilayer flow path member 8 inserted from above the opening portion by pressing by the lid 9, the longitudinal direction of the bead member 20a at the side plates 14 and 15, pin-shaped formed on the upper and lower ends of the 20b height top plate 16 of the projection 24, bead members 20c of the bottom plate 17, in order is set to larger than that of the 20d, and thus be transformed into each apex portion collapsing.

  Accordingly, the multi-layer flow path member 8 is fixed to the storage portion 6 while being reliably prevented from wobbling in both the vertical direction as well as the horizontal direction.

  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, troubles such as fluid leakage may occur even if there is no gap around it. However, since the flow of the fluid in the ultrasonic propagation path 12 is measured as a representative value, the balance between the amount flowing outside the multilayer flow path member 8 and the amount of fluid flowing inside, that is, the flat flow path 7, The positional relationship of the multilayer flow path member 8 forming the ultrasonic propagation path 12 is very important.

  That is, if the multilayer flow path member 8 has shakiness, or if the surrounding gaps vary, the measurement accuracy of the fluid flow is affected, so the flow of the fluid flowing through the ultrasonic propagation path 12 is reduced. In order to stabilize, the multilayer flow path member 8 needs to be securely fixed when the multilayer flow path member 8 is accommodated in the accommodating portion 6 and sealed with the lid portion 9.

  In the present embodiment, this is made possible by deforming the protrusions 24 and 26.

  The volume of one projection 24 is smaller than the volume of the concave portion, and since there is a gap 25 in the vicinity of the other projection 26, it does not protrude even if they are deformed. The protruding portion is sandwiched between the outer walls of the multilayer flow path member 8 so that the lid portion 9 is not closed and can be fixed without being affected by dimensional variations. The gap between the flow path members 8 can be set small.

In addition, the projections 24 and 26 of bead members 20a to 20d, and 21a~21d from where that is positioned to correspond to the longitudinal end portion of the deformation stress applied to them protrusion 24,26 bead member It will be received by 20a-20d and 21a-21d, and will not be added to the side plates 14, 15 of the multilayer flow path member 8, the top plate 16, and the bottom plate 17. That is, the multilayer flow path member 8 itself can be prevented from being deformed and reliably fixed.

(Embodiment 2)
FIG. 8 shows the second embodiment, and the same reference numerals are given to the components that perform the same operations as those in FIG. 7, and the specific descriptions of the first embodiment are used.

Which differ in the first embodiment, the independent concave 22a of the bead portions 20 and 21 lies in that as fitted to 22b.

  According to this configuration, the labyrinth effect between the storage portion 6 of the flow path body 2 and the multilayer flow path member 8 is enhanced, and the fluid can be reliably flowed to the flat flow path 7 of the multilayer flow path member 8.

(Embodiment 3)
FIG. 9 shows the third embodiment, and the same reference numerals are given to the components performing the same operations as those in FIG.

Where differs from the first embodiment, directly protrusions 24a in bead portions 20 and 21, obtained by forming a 26b, each of the projections 24a, 26b are set in a substantially mountain shape, their top It is designed to be easily deformed.

Incidentally, the above embodiment has been arranged bead portion in the longitudinal direction center portion of the multilayer flow path member 8, which is effective when there is no directionality in the accommodating direction of the multilayer flow path member 8, housing direction If there is a directionality, it is possible to prevent an assembly error by changing the number of alignment portions or by making the shape asymmetrical so that it cannot be assembled in the reverse direction.

  Furthermore, although the multilayer flow path member is accommodated in the accommodating portion and sealed with the lid portion, the protruding portion is deformed and the multilayer flow path member is fixed to the accommodating portion 6 so as not to move. In addition, the outer periphery of the multilayer flow path member or the outer periphery of the multilayer flow path member or the storage section and the lid portion is positioned in the vicinity of the protruding portion so as to regulate the gap between the outer periphery of the multilayer flow path member and the storage portion and the lid portion constant Crab alignment step portions may be provided.

  According to this, when the multilayer flow path member is accommodated and the accommodating portion and the lid portion are sealed, the protrusion can be deformed until it comes into contact with the wall surface facing the stepped portion. The gap between the housing portion and the lid portion can be regulated to a constant level, and the deformation allowance of the projection can be controlled, so that a stable fixing force can be obtained.

  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. 1 is an exploded perspective view of a fluid measurement channel device according to Embodiment 1 of the present invention. FIG. Enlarged perspective view of part A in FIG. Enlarged perspective view of part B in FIG. Front sectional view of the fluid flow measurement device Front sectional view of the other part of the fluid measuring channel device Side cross-sectional view of the fluid flow measurement device Side sectional view of a fluid measuring flow path device according to Embodiment 2 of the present invention. The principal part perspective view of the flow-path apparatus for fluid measurement in Embodiment 3 of this invention Sectional view of a conventional fluid measurement channel device

DESCRIPTION OF SYMBOLS 1 Ultrasonic fluid measuring device 2 Fluid path 6 Storage part 7 Flat flow path 8 Multi-layer flow path member 9 Lid part 13 Partition plate 14,15 Side plate 16 Top plate 17 Bottom plate 24, 24a, 26, 26a Protrusion part 22,22a, 22b concave

Claims (7)

A multilayer flow path member having a rectangular cross-sectional shape in which the measurement flow path is partitioned into a plurality of flat flow paths via a partition plate;
A housing portion that houses the multilayer flow path member through an upper opening , and a fluid passage having a rectangular cross-sectional shape having a lid portion that closes the opening ;
The projecting the bead portion to the outer periphery in the multilayered flow passage member in the circumferential direction, and recessed a concave which the bead portion is fitted to the inner wall in the housing unit further corners of the bead portion And forming protrusions that deform due to external force on both sides of the cover, and the protrusions in contact with the lid are pin-shaped,
Wherein when the multilayer flow path member fitted with the lid and housed in the housing portion, wherein the multilayer flow path member fluid measuring channel device designed to fix to the housing portion by deformation of the protrusion. Bead portion fluid measuring channel device according to claim 1, wherein the plural rows formed in the longitudinal direction of the multilayer flow path member. The bead portion with a plurality of strip form in the longitudinal direction of the multilayer flow path member, the bead portion and according to claim 1, wherein the recessed a concave of plural rows in the housing portion individually corresponding fluid passage A flow measuring device for fluid measurement. Bead portions and concave multilayer flow path member and the accommodating portion fluid measuring channel devices longitudinally asymmetrical position was formed to claim 2 or 3 wherein the a. Bead portions and concave multilayer flow path member and the accommodating portion fluid measuring channel devices longitudinally symmetrical positions are formed to claim 2 or 3 wherein the a. A partition plate that divides the 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 arranged vertically in parallel with the partition plate. A multi-layer channel member composed of a top plate supporting an edge and a bottom plate; a housing unit configured to house the multi-layer channel member through an upper opening; and a lid for closing the opening. comprising a fluid passage, while projecting the bead portion from an outer periphery of the multilayer flow path member in the circumferential direction, from the inner wall of the housing portion and the lid portion of the fluid path corresponding to the bead portion, the with bead portion is recessed a concave that fits, on both sides further sandwich the corner portion of the <br/> bead portion to form a protrusion is deformed by an external force, the projecting portion in contact with the lid portion and pin-like, and to fix the multilayer flow path member in the housing portion by deformation of the protrusion Body measuring channel device. Ultrasonic flow measurement meter with the fluid measuring channel device according to any one of claims 1-6.