JP2010112774A - Multilayer channel member and ultrasonic fluid meter using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multilayer channel member capable of improving fluid measurement accuracy in an ultrasonic fluid meter. <P>SOLUTION: When a melt projection portion 20 is molten by a heating heat 21 under a condition of inserting a partition plate 11 between sideboards 13, 14, a deposition surface of a distal end of the melt projection portion 20 is inclined toward vertical direction, therefore, molten condition by the heating head 21 is different between upper and lower surfaces of the partition plate 11; and in a process that a leading edge of melt projection 25 where the heating head 21 initially contacts is molten and portions toward the root of the melt projection portion 25 are sequentially molten, the partition plate 11 is pressed against an end part of an insert hole 17a opposite to the initially molten leading edge, the partition plate 11 is positioned unevenly in relation to the insert hole 17a and fixed in the positional accuracy of the insert hole 17a, and deposition fixation can be performed with high accuracy even when there exists a gap between the partition plate 11 and the insert hole 17a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a multilayer flow path member having a plurality of flat flow paths in a measurement flow path, and an ultrasonic fluid measurement apparatus using the same.

  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 member has a rectangular tube shape with a rectangular cross section, and a pair of wave transmitting / receiving portions is 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).

  Various improvements have been made when the measurement channel is used as a multilayer channel. For example, as illustrated in FIG. 9, the flow path unit 41 forms a flow path that is divided into a plurality of small flow paths by a stacked portion in which a plurality of rectifying plates 40 are stacked. The rectifying plate 40 and the support portion 42 that supports the rectifying plate 40 are integrally formed using a thermosetting resin, and the support portion 42 that supports the plurality of rectifying plates 40 in the stacked portion includes: The plurality of rectifying plates 40 are inserted.

  According to this, since the rectifying plate 40 and the support portion 42 that supports the rectifying plate 40 are integrally formed, it is not necessary to insert one rectifying plate 40 into the support portion 42. .

  Moreover, since it is integrally formed using a thermosetting resin, for example, shrinkage at the time of curing can be suppressed as compared with a case where it is integrally formed with a thermoplastic resin.

  The support portion 42 that supports the plurality of rectifying plates 40 is formed with the plurality of rectifying plates 40 inserted therein, and thus requires an operation of inserting one rectifying plate 40 into the support portion 42. No (see, for example, Patent Document 2).

  As shown in FIG. 10, in another conventional configuration, the groove 51 of the measurement tube member 50 includes an opening 52 and a storage 53. The storage portion 53 is formed at the front end in the depth direction of the groove portion 51 rather than the opening portion 52.

  The opening size of the opening 52 is larger than the plate thickness of the rectifying plate 54. From this opening 52, the current plate 54 is inserted into the groove 51. The storage height dimension of the storage portion 53 is equal to the plate thickness of the rectifying plate 54.

  A current plate 54 is stored in the storage portion 53. The accommodated rectifying plate 54 is in contact with and supported by the inner wall surface of the accommodating portion 53 from the thickness direction of the rectifying plate 54.

  Further, a portion of the groove 51 (hereinafter referred to as a guide portion) extending from the opening 52 to the storage portion 53 is formed in a shape in which the opening size gradually decreases.

  That is, an inclined surface extending from the opening 52 to the storage portion 53 is formed in the guide portion.

  When the rectifying plate 54 in the insertion operation comes into contact with the guide portion, the rectifying plate 54 is guided to the front end in the depth direction of the groove 51 along the inclined surface.

  The rectifying plate 54 guided to the front end in the same direction is stored in the storage portion 53 located at the front end in the same direction as described above.

  Since the rectifying plate 54 is guided to the storage portion 53 by the guide portion, even if the rectifying plate 54 and the storage portion 53 during the insertion operation are inclined (or misaligned) within the range of the opening dimension of the opening portion 52. The operation of inserting the current plate 54 can be continued.

  For this reason, the freedom degree of the positional relationship of the baffle plate 54 and the accommodating part 53 at the time of insertion spreads. As the degree of freedom of the positional relationship between the two increases, the operation of fitting the current plate 54 becomes easier.

Moreover, since the accommodating part 53 contacts and supports the rectifying plate 54 in the housed state, the play of the rectifying plate 54 can be prevented or reduced as usual (for example, see Patent Document 3).
International Publication No. 2004/074783 Pamphlet Japanese Patent Application Laid-Open No. 2004-316685 JP 2006-029907 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 the first example of various improvements when the measurement flow path is used as a multilayer flow path, the plurality of rectifying plates 40 and the support portions 42 that support the rectifying plates 40 are made of a thermosetting resin. Insert molding is integrated and thermosetting resin is used, so it takes time to cure, time to inject the resin into the mold and cool it down to take out the molded product from the mold There is a drawback that it takes a very long time, which increases productivity and increases the cost accordingly.

  For this reason, if a thermoplastic resin is used instead of a thermosetting resin, there is a drawback that the dimensional accuracy is not sufficient because the shrinkage is large.

  Further, it is necessary to set a plurality of rectifying plates 41 to be inserted into the mold at a narrow pitch, and there is a drawback that time and labor for insert molding are required.

  In the second example, the groove 51 includes an opening 52 that is larger than the plate thickness of the rectifying plate 54 and a storage portion 53 that is the same size as the plate thickness of the rectifying plate 54. 52 is formed at the front end of the groove 51 in the depth direction, and the rectifying plate 54 is guided to the guide portion of the opening 52 and guided to the storage portion 53. In order to hold with high dimensional accuracy, a moment is applied to the holding portion 53 to be held, so that strength is required and the depth dimension of the holding portion 53 needs to be sufficiently secured.

  However, if resin is used for the measuring tube member 50 forming the storage portion 53 from the viewpoint of moldability, the thickness must be increased in order to have a holding strength. There is a conflicting problem that the accuracy is lowered. Therefore, it is necessary to balance the workability such as the ease of insertion in combination with the strength and the accuracy, and as a result, there is a disadvantage that high accuracy cannot be pursued.

  The present invention has been made in order to solve the conventional problems, and it is an object of the present invention to provide a highly accurate multilayer flow path member manufacturing method capable of improving fluid measurement accuracy in an ultrasonic fluid measurement device.

  The multilayer flow path member of the present invention is arranged in a rectangular tubular measurement flow path formed in the ultrasonic fluid measurement device, and a partition plate that divides the measurement flow path into a plurality of flat flow paths, A multilayer composed of a side plate that is orthogonal to the partition plate and supports both edge portions, and a top plate that is disposed vertically in parallel with the partition plate and that supports the edge portions by being coupled to the side plate, and a lower plate. An insertion hole for inserting a part of the partition plate into the side plate, a melt projection part provided above and below the insertion hole, and the melt projection in a state where the partition plate is inserted into the side plate. The partition plate is fixed to the side plate by melting the portion with welding means, and the melted state by the welding means is such that the gap between the insertion hole and the partition plate is formed in a certain direction. And different welding means.

  Thus, when the fusion projection is melted by the welding means with the partition plate inserted in the side plate, the welding surface of the tip portion of the fusion projection is inclined in the vertical direction. The melting state of the welding means on the lower surface is different, and the most advanced part of the melt projection first contacting the welding means is melted first, and then gradually melts toward the root part of the melt projection. The gap between the insertion hole and the partition plate is filled from the vicinity of the most advanced portion that melts.

  Therefore, the partition plate is pressed against the end of the insertion hole on the side opposite to the most advanced portion to be melted first, and the partition plate is positioned to be biased with respect to the insertion hole, and is fixed with the positional accuracy of the insertion hole. Even if there is a gap between the partition plate and the insertion hole, it can be welded and fixed with high accuracy. As a result, the spacing between the partition plates can be maintained at the position accuracy of the insertion hole, and the dimensional accuracy can be maintained without increasing the strength of the side plate to which the partition plates are mounted while maintaining the ease of insertion. Without using a separate member for securing the high-precision multi-layer flow path member with a simple configuration.

  According to the present invention, even if there is a gap between the partition plate and the insertion hole, the partition plate can be positioned biased with respect to the insertion hole, so that the spacing between the partition plates can be maintained with the positional accuracy of the insertion hole. It is possible to achieve high accuracy with a simple configuration without increasing the strength of the side plate to which the partition plate is attached and without using a separate member for ensuring dimensional accuracy, while maintaining the workability of ease of insertion. A multilayer flow path member can be formed, and a highly accurate multilayer flow path member that improves fluid measurement accuracy and an ultrasonic fluid measurement apparatus using the multilayer flow path member can be provided.

1st invention is arrange | positioned at the square-tube-shaped measurement flow path formed in the ultrasonic fluid measurement apparatus, The partition plate which divides the said measurement flow path into several flat flow paths, and the said partition plate A multi-layer flow path member that is formed by a side plate that is orthogonal to each other and that supports both edge portions, and is arranged vertically in parallel with the partition plate, and is coupled to the side plate to support both edge portions, and a lower plate. An insertion hole for inserting a part of the partition plate into the side plate, and a fusion projection portion provided above and below the insertion hole, and the fusion projection portion is welded in a state where the partition plate is inserted into the side plate. The partition plate is fixed to the side plate by being melted by the means, and the melted state by the welding means is different between the front and back surfaces of the partition plate so that the gap between the insertion hole and the partition plate is formed in a certain direction. And have a partial welding means.

  According to a second aspect of the present invention, in the first aspect, the partial welding means is configured so that a welding surface of a tip end portion of the fusion projection portion provided above and below an insertion hole for inserting a part of the partition plate into the side plate is formed in the vertical direction. When the melting protrusion is melted by the welding means, the molten state is different between the upper and lower surfaces of the partition plate so that the gap between the insertion hole and the partition plate is formed in a certain direction. It is.

  When the melting projection is melted by the welding means with the partition plate inserted in the side plate, the welding surface of the tip portion of the melting projection is inclined in the vertical direction. In the process where the melting state by the welding means is different, the most advanced part of the melting projection part first contacting the welding means is melted first and then gradually toward the root part of the melting projection part. The gap between the insertion hole and the partition plate is filled from the vicinity of the most advanced portion to be melted.

  Therefore, the partition plate is pressed against the end of the insertion hole on the side opposite to the most advanced portion to be melted first, and the partition plate is positioned to be biased with respect to the insertion hole, and is fixed with the positional accuracy of the insertion hole. Even if there is a gap between the partition plate and the insertion hole, it can be welded and fixed with high accuracy. As a result, the spacing between the partition plates can be maintained at the position accuracy of the insertion hole, and the dimensional accuracy can be maintained without increasing the strength of the side plate to which the partition plates are mounted while maintaining the ease of insertion. Without using a separate member for securing the high-precision multi-layer flow path member with a simple configuration.

  According to a third aspect of the invention, in particular, in the first aspect of the invention, the shape or number of the melt projections provided above and below the insertion hole for inserting a part of the partition plate is changed, and a part of the partition plate is attached to the side plate. The melting amount of the melt projections provided above and below the insertion hole to be inserted is different between the upper and lower sides of the partition plate, so that the gap between the insertion hole and the partition plate is formed in a certain direction.

  The uneven welding means changes the shape or number of the melt projections provided above and below the insertion hole into which the part of the partition plate is inserted to change the upper and lower sides of the insertion hole into which the part of the partition plate is inserted into the side plate. Since the melting amount of the melt projections provided on the upper and lower sides of the partition plate is different, the melting state by the welding means is different between the upper and lower surfaces of the partition plate, and the melted portions of the melt projection portions are sequentially melted by the melt projection portions. Since the flow is smoothed from the larger amount to the smaller amount, the gap between the insertion hole and the partition plate is filled from the vicinity of the larger melting amount of the melt projection.

  Therefore, the partition plate is pressed against the end of the insertion hole on the side opposite to the side where the melting amount of the melt projection portion is large, and the partition plate is biased with respect to the insertion hole. Even if there is a gap between the partition plate and the insertion hole, it can be welded and fixed accurately. As a result, the spacing between the partition plates can be maintained at the position accuracy of the insertion hole, and the dimensional accuracy can be maintained without increasing the strength of the side plate to which the partition plates are mounted while maintaining the ease of insertion. Without using a separate member for securing the high-precision multi-layer flow path member with a simple configuration.

  In the fourth invention, in particular, the multilayer flow path member of any one of the first to third inventions is used in an ultrasonic fluid measuring device.

  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, the fluid path 2 of the ultrasonic fluid measuring apparatus 1 includes left and right vertical channels 3 a and 3 b.
And the horizontal flow path 4 that connects the upper ends of the left and right vertical flow paths 3a and 3b are formed in a substantially inverted U shape.

  The horizontal flow path 4 has a square-tube-shaped measurement flow path accommodating portion 5 whose upper surface for measuring fluid is opened, and a pair of transducers so as to face each other in the measurement flow path accommodating portion 5. An ultrasonic measurement unit 9 having a transducer (not shown) is provided on the attachment unit 8.

  Furthermore, the measurement flow path housing part 5 includes a multilayer flow path member 10 that divides the fluid into a plurality of flat flow paths, and a lid part 7 that houses the multilayer flow path member 10 in the measurement flow path storage part 5 and seals it. Have.

  Therefore, when the lid portion 7 is put on the horizontal flow path 4, the measurement flow path accommodating part 5 is formed in a rectangular tube shape having a rectangular cross section.

  In addition, both the transducer attachment parts 8 and 8 are provided with a circular through hole 8a penetrating in the direction connecting the both transducer attachment parts 8 and 8 to form an ultrasonic wave propagation path 8b. The ultrasonic wave propagation path 8b in the measurement direction connecting each other is provided so as to cross obliquely with respect to 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.

  As shown in FIGS. 2 and 3, the multilayer flow path member 10 includes a partition plate 11 for partitioning the measurement flow path housing portion 5 into a plurality of flat flow paths 6, and a fluid flow direction in the partition plate 11. It is formed in a rectangular box shape by side plates 13 and 14 that support the edge 11a, and a top plate 15 and a bottom plate 16 that are arranged in the vertical direction of the left and right side plates 13 and 14, and between the left and right side plates 13 and 14 The partition plate 11 is held horizontally at a predetermined interval.

  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 provided at equal intervals along the upper and lower sides orthogonal to the fluid flow so that the cross-sectional areas of the flat flow paths 6 partitioned by the partition plates 11 are uniform.

  In addition, in the state where the multilayer flow path member 10 is fitted in the measurement flow path accommodating portion 5, the side plates 13, 14 of the multilayer flow path member 10 located in the ultrasonic wave propagation path 8b are provided with openings 18 for passing ultrasonic waves. It has been. A filter member 19 such as a fine mesh punching metal that can transmit ultrasonic waves is attached to the opening 18.

  The partition plate 11 is an overall rectangular thin plate-like member, and is provided on the edge portion 11a of the partition plate 11 so as to protrude outward in the width direction from the four corners and the center portion of the partition plate 11, and has a plurality of flange portions 11b having end surfaces 11c. The longitudinal ends 11d and 11d are provided on the upstream side and the downstream side in the fluid flow direction.

  On the other hand, the slit 17 provided in the side plates 13 and 14 is provided with an insertion hole 17a at a position corresponding to the flange 11b of the partition plate 11, and the end surface of the flange 11b of the partition plate 11 through the insertion hole 17a. 11 c is exposed to the outside, and the partition plate 11 is supported by the side plates 13 and 14.

  In addition, melting projections 20 are provided above and below the insertion holes 17a of the side plates 13 and 14, and the melting projections 20 are melted in a state where the side plates 13 and 14 are inserted into the flanges 11b of the partition plate 11, The partition plate 11 is welded and fixed to the side plates 13 and 14.

  As shown in FIGS. 3 and 4, when the fusion projection 20 is melted by the heating head 21 of the welding means with the welding surface of the tip portion thereof being inclined in the vertical direction, the partition plate 11 is used. The upper and lower surfaces have different melting states so that the gap between the insertion hole 17a and the partition plate 11 is formed in a certain direction.

  As a welding and fixing method, as shown in FIG. 4A, for example, a heater or the like was used as a means for melting the molten protrusion 20 above and below the insertion hole 17a from the lateral direction of the side plates 13 and 14. The heating head 21 is pressed to melt the melt projection 20 and its vicinity above and below the insertion hole 17a.

  A part of the melted molten projection 20 fills the gap between the end surface 11c of the partition plate 11 and the insertion hole 17a, or the resin in the vicinity of the insertion hole 17a melts to leave the gap between the end surface 11c of the partition plate 11 and the insertion hole 17a. Fill and solidify.

  Then, as shown in FIG. 5B, when the heating head 21 is moved away and the molten resin is cooled and 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 a multilayer. The flow path member 10 is completed.

  Here, when the fusion projection 20 is melted by the heating head 21 with the partition plate 11 inserted into the insertion holes 17a of the side plates 13 and 14, the welding surface of the tip portion of the fusion projection 20 is inclined in the vertical direction. Therefore, the melting state by the heating head 21 is different between the upper and lower surfaces of the partition plate 11, and the most advanced portion of the melting projection 20 that is first in contact with the heating head 21 is melted first. In the process of melting toward the root portion of the first, the gap between the insertion hole 17a and the partition plate 11 is filled from the vicinity of the most advanced portion that melts first.

  Therefore, the most advanced portion of the melt projection 20 that first contacts the heating head 21 is positioned on the lower side, and the partition plate 11 is inserted into the insertion holes 17a of the side plates 13 and 14 by the dead weight of the partition plate 11. In this state, the partition plate 11 is positioned below the insertion hole 17a, and further, the partition plate 11 is pressed against the lower end portion of the insertion hole 17a opposite to the most distal portion that melts at the beginning of the melting projection 20. Thus, the partition plate 11 is biased with respect to the insertion hole 17a, and is fixed with the positional accuracy of the insertion hole 17a. Even if there is a gap between the partition plate 11 and the insertion hole 17a, the partition plate 11 can be welded and fixed with high accuracy. become able to.

  Thereby, since the space | interval of the partition plate 11 can be hold | maintained with the positional accuracy of the insertion hole 17a, the intensity | strength of the side plates 13 and 14 which attach the partition plate 11 is raised, hold | maintaining workability called the ease of insertion. In addition, a highly accurate multilayer flow path member can be formed with a simple configuration without using a separate member for ensuring dimensional accuracy.

  The top plate 15 and the bottom plate 16 can be fixed using an adhesive or the like, but fitting portions are provided on the top and bottom end surfaces of the side plates 13 and 14 and the top plate 15 and the bottom plate 16 to be fitted. In this state, when the melting projection 20 is melted above and below the insertion hole 17a, a part of the fitting portion can be simultaneously melted and fixed by the heating head 21.

(Embodiment 2)
5 to 7 show a second embodiment of the present invention. In the configuration that performs the same operation as in FIGS. 3 and 4, the same reference numerals are given, and the specific description is the same as that of the first embodiment.

As shown in FIG. 5 and FIG. 6, the melt projection 25 provided above and below the insertion hole 17 a into which a part of the partition plate 11 is inserted inclines the welding surface of the tip portion in the vertical direction and has its shape, that is, By changing the height, the amount of melting of the melting projections 25 provided above and below the insertion holes 17a17a for inserting a part of the partition plate 11 into the side plates 13 and 14 is different between the upper and lower sides of the partition plate 11, so that the insertion holes 17a And the partition plate 11 are formed in a certain direction.

  As shown in FIG. 7, the assembly uses a positioning jig 30 having slits 32 set at intervals of the partition plate 11.

  In the assembly method of the multilayer flow path member 10, first, in the positioning jig 30, a pair of holding portions 31 a and 31 b having slits 32 set at a desired interval between the partition plates 11 are arranged so that the slits 32 face each other. To do.

  As shown in FIG. 7B, 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 with high accuracy to the interval and thickness of the partition plate 11 as compared with the slits 17 provided in the side plates 13 and 14. The 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.

  The slits 32 of the holding portions 31a and 31b can secure a sufficient holding allowance, so that a guide portion (not shown) such as a taper is provided so that the longitudinal end portions 11d and 11d of the partition plate 11 can be easily inserted. And workability is further improved.

  Next, as shown in FIG. 7C, the side plates 13 and 14 are brought close to the side end surface 11 c of the partition plate 11 held by the positioning jig 30 and partitioned into the insertion holes 17 a of the slits 17 of the side plates 13 and 14. The edge 11a of the plate 11 is inserted. At this time, each flange portion 11 b provided in the partition plate 11 is fitted into the insertion hole 17 a provided in the slit 17.

  Since the slits 17 and the insertion holes 17a of the side plates 13 and 14 are formed with a margin as compared with the slits 31a of the holding portion 31, the partition plate 11 can be easily inserted.

  Next, as shown in FIG. 6A, the heating head 21 heated by a heater or the like is pressed as a means for melting the melt projection 25 above and below the insertion hole 17a from the lateral direction of the side plates 13 and 14, respectively. The melting projection 25 and the vicinity thereof are melted above and below the insertion hole 17a.

  Part of the melted molten projection 25 fills the gap between the end surface 11c of the partition plate 11 and the insertion hole 17a, or the resin in the vicinity of the insertion hole 17a melts to leave the gap between the end surface 11c of the partition plate 11 and the insertion hole 17a. It is buried and solidified while maintaining the state of being accurately positioned by the positioning jig 30.

  Then, as shown in FIG. 6B, when the heated head 21 is moved away and the melted resin is cooled and 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 a multilayer. The flow path member 10 is completed.

  Here, since the fusion projection part 25 inclines the welding surface of the front-end | tip part to the up-down direction and has changed the shape, ie, height, the effect which inclines the welding surface of the front-end | tip part to an up-down direction is acquired.

Further, the melt projections 25 provided above and below the insertion hole 17a for inserting a part of the partition plate 11 are changed in shape, that is, the height, and the insertion hole 17a for inserting a part of the partition plate 11 into the side plates 13 and 14 is inserted. Since the melting amount of the melt projections 25 provided on the upper and lower sides of the partition plate 11 is different between the upper and lower sides of the partition plate 11, the melting state by the heating head 21 is different on the upper and lower surfaces of the partition plate 11, Since the melted projection 25 is smoothed by flowing from the larger melting amount to the smaller melting amount, the gap between the insertion hole 17a and the partition plate 11 is filled from the vicinity of the larger melting amount of the melting projection 25. Will go.

  Therefore, the partition plate 11 is further pressed from the larger melting amount of the melt projection 25 to the smaller one, and the partition plate 11 is positioned to be biased with respect to the slit 32 of the positioning jig 30 and positioned. The position accuracy of the slit 32 of the jig 30 is further biased and fixed, and even if there is a gap between the partition plate 11 and the insertion hole 17a, it can be welded and fixed with high accuracy.

  Thereby, since the space | interval of the partition plate 11 can be hold | maintained with high precision, without raising the intensity | strength of the side plates 13 and 14 which attach the partition plate 11, maintaining workability | operativity of ease of insertion, A high-precision multilayer flow path member can be formed with a simple configuration without using a separate member for ensuring dimensional accuracy.

  As described above, even if the positioning jig 30 is used in the assembly method of the multilayer flow path member 10, the positioning accuracy of the slit 32 of the positioning jig 30 can be further biased and fixed. With the configuration, it is possible to form the multi-layer flow path member 10 with a high accuracy of the positioning jig 30 or more.

  In addition, although the melt projection part 25 provided above and below the insertion hole 17a for inserting a part of the partition plate has been described with the same number, this may be changed as shown in FIG. Further, the diameter and cross-sectional shape (not shown) of the melt projection 25 may be changed, and may be adjusted according to the welding conditions of the heating head 21, and the configuration of each other part is within the scope of achieving the object of the present invention. Any configuration may be used.

  As described above, the method for manufacturing a multilayer flow path member according to the present invention can form a highly accurate multilayer flow path member with a simple configuration, and the highly reliable multilayer flow path member and the multilayer flow path member can be formed. Since an ultrasonic fluid measuring device using a road member can be provided, it can be applied to uses such as a gas meter.

1 is an overall exploded perspective view of an ultrasonic fluid measuring apparatus according to Embodiment 1 of the present invention. Cross-sectional view of the main part of the ultrasonic fluid measuring device (A) is an exploded perspective view of the multilayer flow path member, (B) is an enlarged perspective view of the main part. Explanatory drawing which shows the welding fixation process of a multilayer channel member (A) is an exploded perspective view of the multilayer flow path member in Embodiment 2 of this invention, (B) is a principal part expansion perspective view. Explanatory drawing which shows the welding fixation process of the multilayer flow path member Explanatory drawing which shows the manufacturing process of the multilayer flow path member (A) is an exploded perspective view of a multilayer flow path member according to another embodiment of the present invention, and (B) is an enlarged perspective view of a main part. (A) is a main part front sectional view of a first example of the conventional ultrasonic fluid measuring device, and (B) is a side sectional view of the same. Sectional drawing of the principal part of the second example of the conventional ultrasonic fluid measuring device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ultrasonic fluid measuring device 5 Measurement flow path accommodating part 10 Multilayer flow path member 11 Partition plate 13, 14 Side plate 15 Top plate 16 Bottom plate 20 Melting projection part 21 Heating head (welding means)

Claims (4)

It is arranged in a rectangular tubular measurement channel formed in the ultrasonic fluid measurement device, and a partition plate that divides the measurement channel into a plurality of flat channels, and both edges perpendicular to the partition plate A multi-layer flow path member which is arranged in parallel with the side plate and supports the both edges by being coupled with the side plate, and a lower plate. An insertion hole into which a part of the partition plate is inserted, and a fusion projection part provided above and below the insertion hole, and the fusion projection part is melted by welding means in a state where the partition plate is inserted into the side plate. The partition plate is fixed to the side plate, and has a partial welding means so that the melted state by the welding means differs between the front and back surfaces of the partition plate so that a gap between the insertion hole and the partition plate is formed in a certain direction. Multi-layer channel member. The uneven welding means is configured to incline the welding surface of the tip end portion of the melting projection portion provided above and below the insertion hole for inserting a part of the partition plate into the side plate in the vertical direction so as to weld the melting projection portion. 2. The multilayer flow path member according to claim 1, wherein when the material is melted, the melt state is different between the upper and lower surfaces of the partition plate so that the gap between the insertion hole and the partition plate is formed in a fixed direction. The uneven welding means changes the shape or number of the melt projections provided above and below the insertion hole for inserting a part of the partition plate, and above and below the insertion hole for inserting a part of the partition plate into the side plate. The multilayer flow path member according to claim 1, wherein a melting amount of the provided melt projection part is different between the upper and lower sides of the partition plate so that a gap between the insertion hole and the partition plate is formed in a certain direction. An ultrasonic fluid measuring device using the multilayer flow path member according to claim 1.