JP2003269417A - Straightening mesh unit and fixing method of straightening mesh - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a straightening mesh unit and a fixing method of the straightening mesh, wherein a mounting state of the straightening mesh is uniformly kept by simple constitution and method, and the straightening mesh is surely fixed to the mesh unit. <P>SOLUTION: An outer side edge part of an opening part of an inner frame body 11a configurating the straightening mesh unit 11, is provided with a first tapered face 11a1 and a second tapered face 11a2 respectively having an outer diameter smaller than an outer face of an inner frame body 11a. The first tapered face 11a1 and the second tapered face 11a2 are formed to have a step slightly smaller than a thickness of a bent piece 15A1, and an outer diameter of the first tapered face 11a1 is larger than an outer diameter of the second tapered face 11a2 by a size corresponding to the step. A plurality of bent pieces 15A1 of the straightening mesh 15A are held by an inner wall of an outer frame body 11b and the second tapered face 11a2, and the outer frame body 11b is fitted to the first tapered face 11a1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a unitized rectifying mesh unit mounted in a flow path of a flow rate measuring device such as an electronic gas meter and a method for fixing the rectifying mesh.

[0002]

2. Description of the Related Art Conventionally, it has been known that a rectifying mesh is provided in the middle of a flow path of an electronic gas meter or the like for the purpose of increasing the flow rate detection accuracy. However, there are problems such as difficulty in tensioning the mesh and obstructing rectification due to the mesh fixing structure. Such conventional problems and conventional rectifying structures using meshes will be described below with reference to the drawings.

9 (A) and 9 (B) are a schematic perspective view showing a first conventional example and a schematic sectional view showing a second conventional example, respectively. In the first conventional example shown in FIG. 9 (A),
A groove 72 is cut in the middle of the flow channel 71 having a concave cross section in a direction perpendicular to the flow direction of the fluid indicated by the arrow. A mesh 74 is slid and inserted into the groove 72 as a rectifying means sandwiched by a metal frame 73 and fixed by spot welding. The mesh 74 may be directly inserted into the groove 72 without the frame 73. Although not shown here, an upper side of the flow channel 71 having a concave cross section is covered with a cover, and a flow rate sensor as a flow rate detecting unit is disposed on the downstream side of the mesh 74 inserted in the flow channel 71. It

Further, in the second conventional example shown in FIG. 9B, the mesh 74 is sandwiched between the parts 75 and 76 constituting the rectifying unit and the like, and the screws 77a and 78a and the bolts 77b and 78b are used. It is fixed. Both of these parts 75 and 76 are cylindrical, and the fluid flows through them in the direction indicated by the arrow in the figure. This fluid is rectified by the mesh 74 and the flow rate is detected by a flow rate sensor (not shown) on the downstream side. Incidentally, 741 and 742 are fluid passage ports provided in the components 75 and 76.

[0005]

However, in the above-mentioned conventional example, first, there is a big problem that it is difficult to make the tension of the mesh 74 uniform. This becomes a cause of individual difference in the flow rate measuring device such as a gas meter to which the mesh 74 is attached. Further, there is also a problem that the flow is disturbed by the step due to the groove 72 for fixing the mesh 74, the screwing portion, etc., and the measurement accuracy is lowered.
Further, there is also a problem that a lot of assembly man-hours are required due to spot welding, screwing and the like.

Therefore, in view of the above-mentioned present situation, the present invention is capable of reliably fixing the rectifying mesh to the mesh unit while keeping the tension of the rectifying mesh uniform with a simple structure and method. An object is to provide a method for fixing a mesh unit and a rectifying mesh.

[0007]

The rectifying mesh unit according to claim 1, which has been made to solve the above-mentioned problems, comprises:
As shown in FIG. 1 and FIG. 2, a rectifying mesh unit 11 is installed in the flow path of a flow rate measuring device and rectifies a fluid whose flow rate is detected by a flow rate sensor. A long cylindrical middle frame body 11a and a first peripheral frame body provided around the outer edge portion of at least one opening of the middle frame body 11a with an outer diameter smaller than the outer surface of the middle frame body 11a. 1 taper surface 11a1 and 2nd taper surface 11a2
And an outer frame body 11b fitted to the first tapered surface 11a1
And a rectifying mesh 1 having a plurality of bent pieces 15A1 attached to the second tapered surface 11a2 and covering the opening.
5A, the first taper surface 11a1 and the second taper surface 11a2 are formed to have a step slightly smaller than the thickness of the bent piece 15A1. The outer diameter of the first tapered surface 11a1 is larger than the outer diameter of the second tapered surface 11a2, and the plurality of bent pieces 15A1 are sandwiched between the inner wall of the outer frame body 11b and the second tapered surface 11a2. The outer frame body 11b is fitted to the first tapered surface 11a1.

According to the first aspect of the present invention, the outer edge portion of the opening of the inner frame body 11a forming the main rectifying mesh unit 11 has an outer diameter smaller than the outer surface of the inner frame body 11a. It is provided with a first taper surface 11a1 and a second taper surface 11a2 that are circumferentially provided. The first taper surface 11a1 and the second taper surface 11a2 are formed to have a step slightly smaller than the thickness of the bent piece 15A1, and the outer diameter of the first taper surface 11a1 is equivalent to this step. It is larger than the outer diameter of the second tapered surface 11a2. Then, the outer frame body 11b is fitted to the first tapered surface 11a1 such that the inner wall of the outer frame body 11b and the second tapered surface 11a2 sandwich the plurality of bent pieces 15A1 of the rectifying mesh 15A. . Therefore, the rectifying mesh 15A can be reliably fixed to the outer frame body 11b forming the mesh unit 1 while maintaining the tension of the rectifying mesh 15A uniform.

A rectifying mesh unit according to a second aspect of the present invention has been made to solve the above-mentioned problems. As shown in FIGS. 1 and 2, in the rectifying mesh unit of the first aspect, the middle frame body 11a is , The first tapered surface 11a1 and the second tapered surface 11 also on the outer edge of the other opening.
The pair of locking pieces 1 has a third taper surface and a fourth taper surface similar to a2, respectively, and are fitted into the third taper surface and locked in the locking groove 131 of the other rectifying unit 13.
An outer frame body 11c with a locking piece having 11, 113 and a plurality of bending pieces 15A1 attached to the fourth tapered surface,
A rectifying mesh 15A for covering the other opening is further provided, and similar to the rectifying mesh 15A for covering the other opening by the inner wall of the locking piece-equipped outer frame 11c and the fourth tapered surface. The outer frame body 11c with the locking piece is fitted to the third tapered surface so as to sandwich a plurality of bent pieces of the other rectifying mesh 15B.

According to the second aspect of the present invention, in the middle frame body 11a of the present rectifying mesh unit 11, the first tapered surface 11a1 of the other opening is also provided on the outer edge of the other opening.
Also, since the third taper surface 11a2 and the second taper surface 11a2 have the same third taper surface and fourth taper surface, respectively, another rectifying mesh 15B can be similarly sandwiched here. Therefore, in addition to the rectifying mesh 15A, the rectifying mesh 15B can be used as a rectifying element. In particular, the locking groove 131 of another rectifying unit 13 is formed in the middle frame 11a.
The other rectifying unit 13 is also connected to the main rectifying mesh unit 11 by fitting the outer frame body 11c with the engaging pieces having the engaging pieces 111 and 113 that are locked to each other to sandwich the rectifying mesh 15B. it can.

The rectifying mesh unit according to claim 3 made to solve the above-mentioned problems is, as shown in FIGS. 1 and 2, in the rectifying mesh unit according to claim 2, the middle frame 11a and The outer frame 11b and the outer frame 11a and the outer frame 11c with the locking piece form the same outer surface when they are integrated with each other.

According to the third aspect of the invention, the middle frame 11
a and the outer frame body 11b, and the outer frame body 11a and the outer frame body 11c with the locking piece form the same plane when they are integrated. It becomes easy to attach to.

In order to solve the above-mentioned problems, a method of fixing a rectifying mesh according to a fourth aspect of the present invention is, as shown in FIG. 1 and FIG. Frames 11a, 11b, 11 of the rectifying mesh unit 11 are configured to rectify the mesh for rectifying the fluid whose flow rate is detected.
A method of fixing the same to the outer peripheral surface of the tubular frame 11a having a predetermined length forming the outer shape of the rectifying mesh unit 11 at the outer edge smaller than the outer surface of the medium frame 11a. A tapered surface 11a2 having a diameter is provided around the tapered surface 11a2 to cover the opening.
A plurality of bent pieces 15A1 formed by bending are attached to
Further, the outer frame body 11b is fitted to the tapered surface 11a2 such that the plurality of bent pieces 15A1 are sandwiched between the inner wall of the outer frame body 11b and the tapered surface 11a2.

According to the fourth aspect of the invention, a tapered surface 11a2 having an outer diameter smaller than that of the outer surface of the middle frame 11a forming the outer shape of the rectifying mesh unit 11 is provided around the tapered surface 11a2. The bent piece 15A1 of the rectifying mesh 15A is additionally provided, and the outer frame body 11b is fitted to the tapered surface 11a2 such that the inner wall of the outer frame body 11b and the tapered surface 11a2 sandwich the plurality of bent pieces 15A1. Therefore, the rectifying mesh 15A can be reliably fixed to the inner frame body 11b of the mesh unit 1 while maintaining the tension of the rectifying mesh 15A uniform.

A rectifying mesh unit according to a fifth aspect of the present invention, which has been made to solve the above problems, is a fluid which is mounted in the flow path of a flow rate measuring device and whose flow rate is detected by a flow rate sensor, as shown in FIG. A rectifying mesh unit 11 'for rectifying the fluid, the tubular frame 11a' having a predetermined length through which the fluid passes, and the frame 11a 'in at least one opening of the frame 11a'. The triangular rib 115 'having a triangular cross-section formed so as to circulate slightly larger than the inner side surface of the same, and the same shape as the part surrounded by the triangular rib 115', and fitted in this part, the rectifying mesh 15A ′ And the rectifying mesh 15A ′
Is welded to the inner surface of the triangular rib 115 'and a part of the opening.

According to the fifth aspect of the present invention, in the present rectifying mesh unit 11 ', a part of the opening of the frame 11a' and the triangular rib 115 'having a triangular cross section formed in the opening are formed. Since the rectifying mesh 15A 'is configured to be welded to the inner side surface, the rectifying mesh 15A' can be reliably held while maintaining a uniform tension with a simple structure.
Can be fixed to the frame 11a '. In particular, the triangular rib 115 'having a triangular cross section improves the initial biting of the rectifying mesh 15A'.

A rectifying mesh unit according to a sixth aspect of the present invention, which has been made to solve the above-mentioned problems, as shown in FIG.
The frame 11a 'also has the triangular rib 1 in the other opening.
A triangular rib similar to that of 15 'and a pair of locking pieces 111', 11 locked in the locking groove 131 of the other rectifying unit 13
3'and another rectifying mesh 15B 'similar to the rectifying mesh 15A' is welded to the inner surface of the triangular rib of the other opening and a part of this opening. Characterize.

According to the sixth aspect of the invention, the frame body 11a 'of the present rectifying mesh unit 11' has a triangular rib similar to the triangular rib 115 'in the other opening, and another rectifying unit 13'. A pair of locking pieces 1 locked in the locking groove 131
Since 11 'and 113' are provided, in addition to the rectifying mesh 15A ', the rectifying mesh 15B' can also be used as a rectifying element. In particular, the rectifying mesh unit 11 'is
Since the locking pieces 111 'and 113' are locked in the locking grooves 131 of the other rectifying unit 13, the rectifying unit 13 such as the rectifying plate unit can also be connected.

In order to solve the above-mentioned problems, the method for fixing a rectifying mesh according to claim 7 is, as shown in FIG. 3, mounted in the middle of a flow path of a flow rate measuring device and the flow rate is detected by a flow rate sensor. A method of fixing a mesh for rectifying a fluid to a frame body of the rectifying mesh unit 11 ', which is provided in an opening of a tubular frame body 11a' having a predetermined length which constitutes an outer shape of the rectifying mesh unit 11 '. A triangular rib 115 'having a triangular cross section is formed so as to circulate slightly larger than the inner side surface of the frame 11a', and a rectifying mesh 15A 'having the same shape as the portion surrounded by the triangular rib 115' is formed in the triangular shape. It is characterized in that it is welded to the inner surface of the rib 115 'and a part of the opening.

According to the seventh aspect of the present invention, the triangular rib 11 having a triangular cross section at the opening of the tubular frame 11a 'having a predetermined length which constitutes the outer shape of the rectifying mesh unit 11.
Since 5'is formed and the rectifying mesh 15A 'is welded to the inner side surface of the triangular rib 115' and a part of the opening, the tensioning condition is kept uniform by a simple method.
The rectifying mesh 15A 'can be surely fixed to the frame 11a'.

In order to solve the above-mentioned problems, the method for fixing the rectifying mesh according to claim 8 is as shown in FIG. 3, in the method for fixing the rectifying mesh according to claim 7, the triangular rib 115 'is provided. It is characterized in that the welding strength is controlled by adjusting the cross-sectional area of.

According to the invention of claim 8, the triangular rib 1
Since the welding strength can be controlled by adjusting the cross-sectional area of 15 ', the rectifying mesh 15 made of various materials is used.
It is possible to easily deal with A'and the frame 11a '.

The rectifying mesh unit according to claim 9 made to solve the above-mentioned problems, as shown in FIG. 5, is a fluid which is mounted in the middle of the flow path of the flow rate measuring device and whose flow rate is detected by the flow rate sensor. A first rectifying mesh unit 3 for rectifying the rectifier, which is integrated and combined to form an outer shape of the rectifying mesh unit 3.
The outer frame body 31, the second outer frame body 32, the middle frame body 33, and the inner frame body 34 are formed corresponding to one opening of the first outer frame body 31 and the middle frame body 33, respectively. Inclined portion 31a,
A first rectifying mesh 15D whose ends are sandwiched and fixed between 33a, a groove 33b provided around an edge of the middle frame 33 near one opening, and the first outer frame. 31
And a claw portion 31b formed in the groove 33b and engaged with the groove portion 33b,
A second fitting part 33c, 34c, which is formed so as to be fitted into the other opening part of the middle frame body 33 and one opening part of the inner frame body 34, has its end part sandwiched and fixed. Ends of the rectifying mesh 15E and second fitting portions 34d, 32d formed so as to be fitted to the other opening of the inner frame 34 and part of the inner surface of the second outer frame 32, respectively. The third rectifying mesh 15F sandwiched between and fixed, and inclined side surfaces 34e, 32e formed corresponding to the outer side surface of the inner frame body 34 and the inner side surface of the second outer frame body 32, respectively.
And an edge near the other opening of the middle frame 33 and the second
The outer frame 32 is provided with resin inflow flanges 33f and 32f that are respectively provided at the edges of the outer frame 32. The first inflow mesh 15D is sandwiched between the groove 33b and the claw portion 31.
b so that the first outer frame body 31 and the middle frame body 3 are engaged with each other.
3 is combined with the second rectifying mesh 15E.
The inner frame body 33 and the inner frame body 34 are combined so that the second outer frame body 32 is sandwiched between the inner frame body 33 and the third rectifying mesh 15F and the inclined side surfaces 34e and 32e are used. The second outer frame body 32 so as to cover 34
And the inner frame 34 are combined with each other, and a resin 36 is poured into a resin inflow portion 35 formed by the resin inflow flanges 33f and 32f to be integrated.

According to the invention described in claim 9, in the present rectifying mesh unit 3, the tubular first outer frame body 31, second outer frame body 32, middle frame body 33, and inner frame body 34 are The first rectifying mesh 15D, the second rectifying mesh 15E and the first rectifying mesh 15D are sandwiched and integrated. That is, the first outer frame body 31 and the middle frame body 33 are combined so that the first rectifying mesh 15D is sandwiched and the groove portion 33b and the claw portion 31b are engaged with each other, and the second rectifying mesh 15E is sandwiched in between. Frame 33 and inner frame 3
4, the second outer frame body 32 and the inner frame body 34 are sandwiched so that the second outer frame body 32 covers the inner frame body 34 by using the inclined side surfaces 34e and 32e. And the resin 3 is attached to the resin inflow portion 35 formed by the resin inflow flanges 33f and 32f.
6 is poured and integrated. With such a configuration, it is possible to reliably fix the plurality of rectifying meshes 15D, 15E, 15E in the mesh unit 3 while maintaining the tensioned condition uniformly.

A method for fixing a rectifying mesh according to a tenth aspect of the present invention, which is made to solve the above-mentioned problems, is as shown in FIG. A method of fixing a mesh for rectifying a fluid to the rectifying mesh unit 3, which is provided around one opening of a cylindrical middle frame body 33 forming a part of the outer shape of the rectifying mesh unit 3. One end of the middle frame body 33 is formed by sandwiching the end portion of the first rectifying mesh 15D between the inclined portion 33a and the inclined portion 31a of the first outer frame body 31 formed corresponding to the inclined portion 33a. The inwardly facing claw portion 31b formed on the first outer frame body 31 is engaged with the groove portion 33b provided around the edge portion near the opening.

According to the tenth aspect of the invention, between the inclined portion 33a provided around the opening of the middle frame body 33 constituting the rectifying mesh unit 3 and the inclined portion 31a of the first outer frame body 31. The end portion of the first rectifying mesh 15D is sandwiched between, and the inwardly facing claw portion 31b formed on the first outer frame body 31 is engaged with the groove portion 33b provided around the edge portion near the opening of the middle frame body 33. Therefore, it is possible to reliably fix the rectifying mesh 15D to the first outer frame 31 while keeping the tension of the rectifying mesh 15D uniform.

According to a method of fixing a rectifying mesh according to claim 11 which has been made to solve the above-mentioned problems, as shown in FIG. 5, in the method of fixing a rectifying mesh according to claim 10, the middle frame 33 is provided. First fitting portions 33c, 34c formed so as to be fitted into one opening portion of the cylindrical inner frame body 34 having the other opening portion and the inclined outer side surface 34e, respectively.
The inner frame body 33 is attached to the inner frame body 34 so that the end portion of the second rectifying mesh 15E is sandwiched between the inner frame body 34 and the other opening portion of the inner frame body 34 and the cylindrical second outer frame body 32. The third rectifying mesh 15F is formed on the second fitting portions 34d and 32d, which are formed so as to be fitted to a part of the inner surface of the
Of the second outer frame body 32, and the second outer frame body 32 is attached so that the second outer frame body 32 covers the inner frame body 34, and the edge of the middle frame body 33 near the other opening and the edge of the second outer frame body 32. It is characterized in that the resin 36 is poured into the resin inflow portion 35 formed by the resin inflow flanges 33f and 32f which are respectively provided on the portions.

According to the invention described in claim 11, the middle frame 3
The inner frame body 33 is configured such that the end portions of the second rectifying mesh 15E are sandwiched between the first fitting portions 33c and 34c that are formed so as to be fitted into the opening portions of the inner frame body 34 and the inner frame body 33, respectively. The second fitting portions 34d, 32d formed on the opening of the inner frame 34 and the second outer frame 32 while being attached to the body 34
Is attached so that the end portion of the third rectifying mesh 15F is sandwiched between the second outer frame body 32 and the inner frame body 34, and the resin inflow flanges 3 of the middle frame body 33 and the second outer frame body 32 are attached.
Since the resin 36 is poured into the resin inflow portion 35 formed by 3f and 32f, the plurality of rectifying meshes 1
It is possible to securely fix the 5E and 15E in the mesh unit 3 while maintaining a uniform tension condition.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First Embodiment First, a first embodiment of a rectifying mesh unit and a method of fixing a rectifying mesh of the present invention will be described with reference to FIGS. 1 and 2. 1 and 2 are a perspective view and an exploded perspective view showing a first embodiment of a rectifying mesh unit of the present invention, respectively.

As shown in FIGS. 1 and 2, the first aspect of the present invention is as follows.
The first and second mesh units 11 and 12 according to the embodiment form the rectifier 1 by being integrated with the rectifying plate unit 13, for example. These units 11, 12 and 13
Both have essentially the outline of a frame, which are made of heat-resistant plastic, for example. And
The units 11, 12 and 13 are separately formed, and are assembled and integrated to form one rectifier 1. The rectifier 1 including the first and second mesh units 11 and 12 as described above is mounted, for example, in the middle of a flow path where a flow rate sensor of a gas meter described later is installed.

In the first mesh unit 11, a rectangular tubular middle frame body 11a having a predetermined length, an outer frame body 11b and an outer frame body 11c with a locking piece are integrated so as to sandwich the rectifying meshes 15A and 15B. It is configured. Both of these
Made of heat resistant plastic.

The inner frame 11a has a first taper surface 11a1 and a second taper surface 1 that are provided around the outer edge of the opening and have a smaller outer diameter than the outer surface of the inner frame 11a.
1a2. The first taper surface 11a1 and the second taper surface 11a2 are formed to have a step slightly smaller than the thickness of the bent piece 15A1 of the rectifying mesh 15A. The outer diameter of the first tapered surface 11a1 is larger than the outer diameter of the second tapered surface 11a2 by the amount corresponding to this step.

The outer frame body 11b is composed of a quadrangular frame body so as to fit into the first tapered surface 11a1. That is, this length is substantially equal to the sum of the widths of the first tapered surface 11a1 and the second tapered surface 11a2.

The rectifying mesh 15A has a predetermined number of metal mesh structures for rectifying the fluid whose flow rate is to be detected, and has a quadrilateral main rectifying section and the above-mentioned second section on each side of the main rectifying section. A plurality of, in this example, four bending pieces 15A1 are formed to be attached to the tapered surface 11a2.

When assembling the inner frame body 11a and the outer frame body 11b, these four bent pieces 15A1 are first attached to the second tapered surface 11a2. And the outer frame 1
A plurality of bent pieces 15A1 of the rectifying mesh 15A are sandwiched between the inner wall of 1b and the second tapered surface 11a2,
The outer frame body 11b is fitted to the first tapered surface 11a1.

As described above, the first tapered surface 11a1 and the second tapered surface 11a2 have a step slightly smaller than the thickness of the bent piece 15A1 of the rectifying mesh 15A,
Since this is sandwiched between the outer frame body 11b and the second tapered surface 11a2, the rectifying mesh 15A is securely fixed at a predetermined position. In addition, the mesh 15 should be tensioned with a proper tension to maintain the tension.
Since A is fixed, the rectification accuracy and the detection accuracy are stable, and the individual difference of the flow rate measuring device such as the gas meter can be made very small. Further, unlike the conventional case, the occurrence of the disturbance due to the step is eliminated. Furthermore, since the outer frame body 11b may be assembled so as to fit into the inner frame body 11a, the number of assembling steps can be reduced.

On the other hand, although not shown here, the middle frame 11
a is the same as the first tapered surface 1 on the outer edge of the other opening.
1a1 and the third taper surface 11a2 and the same third
It has a taper surface and a fourth taper surface. Then, on the opening side, an outer frame body with a locking piece 11c having a pair of locking pieces 111 and 113 that are locked with another rectifying unit 13, for example, the locking groove 131 of the rectifying plate unit 13 or the like. Is installed. The locking pieces 111 and 113 are flexible and extend forward like arms.

The outer frame 11c with locking pieces is a pair of locking pieces 1.
Except having 11, 11, 113, it has the same structure as the outer frame body 11b. The outer frame body 11c with the locking piece, the inner frame body 11a, and the assembling method are also the same as the inner frame body 11a and the outer frame body 11b.
The same as the assembling method of. That is, the outer frame body 11c with the locking piece is arranged so that the bent piece of the rectifying mesh 15B similar to the above rectifying mesh 15A is sandwiched, and the outer frame body 11c with the locking piece is formed.
It is fitted to a.

Therefore, in addition to the rectifying mesh 15A, the rectifying mesh 15B can be used as a rectifying element, and a higher rectifying effect can be obtained with a simple structure. Further, the locking pieces 111, 11 which are locked in the locking groove 131 of the current plate unit 13 and the like in the middle frame 11a.
By fitting the outer frame body 11c with a locking piece having 3 and sandwiching the rectifying mesh 15B, the rectifying plate unit 13 and the like can be connected to the first mesh unit 11 as well, and a higher rectifying effect can be obtained. It also becomes possible to obtain.

Further, the outer surfaces of the inner frame body 11a and the outer frame body 11b, and the inner frame body 11a and the outer frame body 11c with locking pieces form the same surface when they are integrated. Therefore, it becomes easy to mount the gas meter in a predetermined housing portion.

The rectifying plate unit 13 connected to the outer frame body 11c with the locking piece has an outer frame portion having a predetermined length and a concave cross section, and the inner wall of the outer frame portion has a uniform flow passage cross section. It has a plurality of thin plate-shaped straightening vanes 14 arranged in parallel at equal intervals so as to be divided into. Both the outer frame portion and the current plate 14 are made of heat-resistant plastic, for example.
The straightening plate unit 13 is formed with four locking grooves 131, 132 and the like (locking grooves corresponding to the locking pieces 113, 124 are shown) such that the opposing outer side walls are hollowed out. In detail, the locking groove 131 is the same as the locking piece 1 described above.
Slide groove 1 in which the locking protrusion 111a of 11 can slide
31b and a locking recess 131a having a shape corresponding to the locking projection 111a. Further, a plurality of grooves 135 into which the plurality of thin plate-shaped rectifying plates 14 are slidably inserted are formed on the inner walls of the outer frame portion of the rectifying plate unit 13 which face each other. By utilizing these grooves 135, the plurality of current plate 14 can be easily attached. The same applies to the other locking grooves 132 and the like.

Further, the locking groove 1 of the current plate unit 13
A second having a mesh 15C continuously arranged via 32 and the like
The mesh unit 12 can be similarly formed by diverting the configuration of the second mesh unit 12 described above. This second
Flexible arm-shaped locking pieces 122 and 124 are also projected from both side edge portions of the mesh unit 12. Inward locking projections 122a and 124a are formed near the tips of the locking pieces 122 and 124, respectively.

Then, the first mesh unit 11 and the second mesh unit 12 are assembled so as to sandwich the straightening vane unit 13 from both sides to form the straightener 1. The rectifier 1 assembled in this way is fixed at a predetermined position of the flow path of the gas meter main body 5 described later to rectify the gas flow from the upstream side or finely vortex the vortex generated in the gas flow to obtain a flow velocity. The distribution is made uniform and the back flow of gas is prevented to improve the flow rate detection accuracy. First mentioned above
The embodiment corresponds to the invention described in claims 1 to 4.

Second Embodiment Next, a second embodiment of the rectifying mesh unit and the method of fixing the rectifying mesh of the present invention will be described with reference to FIGS. 3 and 4. 3 (A) and 3 (B) are respectively an exploded perspective view showing a second embodiment of the rectifying mesh unit of the present invention and an enlarged sectional view taken along line AA of FIG. 3 (A). FIG. 4 is a schematic perspective view showing an example of a horn of the ultrasonic welding machine according to the second embodiment of FIG.

As shown in FIG. 3A, the first mesh unit 11 'according to the second embodiment of the present invention is the first mesh unit 11' described above.
Similar to the embodiment, the rectifier 1 ′ is configured with the second mesh unit 12 and the rectifying plate unit 13. Both of these units 11 ', 12 and 13 basically have the outer shape of a frame body, and they are formed of, for example, heat resistant plastic. And each unit 11 ', 12 and 13
Are separately formed, and these are assembled and integrated to form one rectifier 1 '. Such a first
The rectifier 1 including the mesh unit 11 'is mounted, for example, in the middle of a flow path in which a flow rate sensor of a gas meter described later is installed. The second mesh unit 12 may also have the same configuration as the first mesh unit 11 ', but here, in order to simplify the description, the first mesh unit 11'
The description will be made assuming that the first mesh unit 11 in the embodiment is replaced with the first mesh unit 11 '.

The first mesh unit 11 'is shown in FIG.
As shown in (A), it includes a rectangular tubular frame 11a 'of a predetermined length through which the fluid passes. In one opening of the frame body 11a ', a triangular cross section that circulates slightly larger than the inner side surface of the frame body 11a' (see the enlarged cross-sectional view of FIG. 3B).
A triangular rib 115 'is formed.

A rectifying mesh 15A 'having the same shape as this portion is attached to the portion surrounded by the triangular rib 115'. The rectifying mesh 15A 'has a predetermined number of quadrilateral metal mesh structure for rectifying the fluid whose flow rate is detected. The end of the rectifying mesh 15A 'extends over the entire circumference, and the triangular rib 11 is formed.
It is welded to the inner surface of 5'and part of the opening.

For this welding, for example, a horn 2 of an ultrasonic welding machine as shown in FIG. 4 is used. In the figure, horn 2
The front end portion 21 of the is a contact portion 22 that is opened in a square shape. After the rectifying mesh 15A 'is attached to the portion surrounded by the triangular rib 115', the contact portion 22 is ultrasonically vibrated in contact with the inside of the triangular rib 115 'and the rectifying mesh 15A' for welding. , Rectifying mesh 1
5A 'is welded to the frame 11a'.

As described above, the rectifying mesh 15A 'is welded to a part of the opening of the frame 11a' and the inner surface of the triangular rib 115 'having a triangular cross section formed in the opening. As a result, the straightening mesh 15A 'is securely held while maintaining a uniform tension with a simple structure.
Can be fixed to the frame 11a '. That is, since the mesh 15A 'is fixed in a state in which a proper tension is applied and the tension is uniformly maintained, the rectification accuracy,
Further, the detection accuracy is stable, and the individual difference of the flow rate measuring device such as a gas meter can be made very small. Further, unlike the conventional case, the occurrence of the disturbance due to the step is eliminated. Furthermore,
Due to the triangular rib 115 'having a triangular cross section, the flow regulating mesh 15A' has a good initial bite and the melted frame 11
It becomes easy for part of a'to rotate. Further, since the welding strength can be controlled by adjusting the cross-sectional area of the triangular rib 115 ', it is possible to easily deal with the rectifying mesh 15A' and the frame 11a 'of various materials.

On the other hand, although not shown here, the frame 11
a'is also provided with the triangular rib 11 on the outer edge of the other opening.
It has triangular ribs similar to 5 '. Similar to the above-mentioned method, a rectifying mesh 15B 'similar to the rectifying mesh 15A' is welded here. Further, on this side, a pair of locking pieces 111 ′, 11 ′ that are locked in the locking groove 131 of another rectifying unit 13, for example, the rectifying plate unit 13.
3'is formed. These locking pieces 111 ', 11
3'is flexible and extends forward like an arm.

As described above, the frame 11a 'has a triangular rib similar to the triangular rib 115' in the other opening, and a pair of locking pieces locked in the locking grooves 131 of the other rectifying unit 13. Since it has 111 'and 113', it becomes possible to use not only the rectifying mesh 15A 'but also the rectifying mesh 15B' as a rectifying element, and it is possible to obtain a higher rectifying effect with a simple structure. Become. Particularly, since the rectifying mesh unit 11 ′ has the locking pieces 111 ′ and 113 ′ which are locked in the locking grooves 131 of the rectifying plate unit 13,
For example, by connecting the rectifying unit 13 also, it is possible to obtain a higher rectifying effect.

Although not shown here, it is possible to weld the rectifying mesh 15C to the second mesh unit 12 in the same manner as the first mesh unit 11 '. In addition, the straightening plate unit 13 which is continuously provided between the mesh unit 11 ′ and the mesh unit 12
Since the configuration and the continuous installation method by locking are the same as those in the first embodiment, the description thereof will be omitted here.

Then, the rectifier 1'constituted in this way
Is fixed at a predetermined position in the flow path of the gas meter main body 5 described later to rectify the gas flow from the upstream side, to finely vortex the gas flow to make the vortex uniform, and to Prevents backflow and improves flow rate detection accuracy. The second embodiment described above corresponds to the invention described in claims 5-8.

Third Embodiment Next, a third embodiment of the rectifying mesh unit and the method of fixing the rectifying mesh of the present invention will be described with reference to FIG. FIG. 5 is a sectional view showing a third embodiment of the rectifying mesh unit of the present invention.

As shown in FIG. 5, the mesh unit 3 according to the third embodiment of the present invention has a tubular first outer frame body 31,
The second outer frame body 32, the middle frame body 33, and the inner frame body 34 are the first
The rectifying mesh 15D, the second rectifying mesh 15E, and the third rectifying mesh 15F are sandwiched and integrated.

That is, the first outer frame body 31 and the middle frame body 33 are combined so that the first rectifying mesh 15D is sandwiched and the groove portion 33b and the claw portion 31b are engaged, and the second rectifying mesh 15E is sandwiched. Thus, the inner frame body 33 and the inner frame body 34 are combined, and the third rectifying mesh 15F
And the inclined side surfaces 34e and 32e are used for the second
The second outer frame body 32 and the inner frame body 34 are combined so that the outer frame body 32 covers the inner frame body 34, and the resin 36 is placed in the resin inflow portion 35 formed by the resin inflow flanges 33f and 32f. It is poured and integrated.

Specifically, the first rectifying mesh is provided between the sloping portion 33a provided around the opening of the middle frame body 33 constituting the rectifying mesh unit 3 and the sloping portion 31a of the first outer frame body 31. The end portion of 15D is sandwiched, and the inwardly facing claw portion 31b formed on the first outer frame body 31 is engaged with the groove portion 33b provided around the edge portion near the opening of the middle frame body 33.

Further, the first fitting portion 33 formed so as to be fitted into the opening portion of the middle frame body 33 and the opening portion of the inner frame body 34, respectively.
The inner frame body 33 is attached to the inner frame body 34 such that the end portions of the second rectifying mesh 15E are sandwiched between c and 34c, and the opening formed in the inner frame body 34 and the second outer frame body 32 are formed. The second rectifying mesh 15 is attached to the two fitting portions 34d and 32d.
The end portion of F is sandwiched, and the second outer frame body 32 has an inner frame body 34.
It is attached to cover. Then, in this state, the resin inflow flange 33 of the middle frame 33 and the second outer frame 32
The resin 36 is poured into the resin inflow portion 35 formed by f and 32f.

In this way, the inclined portion 3 provided around the opening of the inner frame body 33 constituting the rectifying mesh unit 3 is provided.
The end of the first rectifying mesh 15D is sandwiched between the 3a and the inclined portion 31a of the first outer frame body 31, and the first outer portion is formed in the groove portion 33b provided around the edge portion in the vicinity of the opening portion of the middle frame body 33. Frame 31
Since the inwardly facing claw portion 31b formed on the ridge is engaged, the rectifying mesh 15D is securely fixed to the first outer frame body 31 while maintaining the tension of the rectifying mesh 15D uniform. can do. That is, since the mesh mesh 15D is fixed in a state in which a proper tension is applied and the tension is uniformly maintained, the rectification accuracy and the detection accuracy are stable, and the rectification mesh unit 3 is mounted. The individual difference of the flow rate measuring device used can be made very small. Further, unlike the conventional case, the occurrence of the disturbance due to the step is eliminated. Furthermore, since the first outer frame body 31 is fixed to the middle frame body 33 with the rectifying mesh 15D sandwiched only by the engagement of the claw portions 31b and the groove portions 33b, the number of assembling steps can be reduced.

Each of the frames 31 to 34 is made of, for example, heat-resistant plastic, and the mesh 15D to
15F has a predetermined number of metal mesh structures. Also,
The mesh unit 3 may have, for example, a quadrangular prism shape or a cylindrical shape. Then, in accordance with this, the meshes 15D to 15F also have a square or circular shape.

The rectifying mesh unit 3 thus constructed is fixed at a predetermined position of the flow path in the flow rate measuring device such as a gas meter to rectify the gas flow flowing in the direction of the arrow in the drawing, The vortex generated in the gas flow is finely crushed to make the flow velocity distribution uniform, and the backflow of gas is prevented to improve the flow rate detection accuracy. The third embodiment described above corresponds to the invention described in claims 9 to 11.

Finally, with reference to FIGS. 6, 7 and 8, an example of a gas meter equipped with the rectifiers 1 and 1 ′ including the rectifying mesh unit shown in the first and second embodiments. explain. 6, FIG. 7, and FIG. 8 are a plan view, a rear view, and a cross-sectional view taken along line XX in FIG. 6, showing an example of a gas meter main body of a gas meter to which the rectifier shown in the first embodiment and the second embodiment is attached, respectively. is there.

The gas meter to which the above-mentioned rectifiers 1 and 1'are attached is composed of a gas meter body 5 shown in FIGS. 6, 7 and 8 and a gas meter cover (not shown) which is provided on the front side of the gas meter body 5. It In addition, here
The gas meter is assumed to be an electronic gas meter equipped with a microcomputer to detect a flow rate, that is, to detect a gas usage amount, or to detect a gas flow abnormality and perform abnormality processing.

As shown in FIGS. 6, 7 and 8, the gas meter body 5 has a box-shaped outer shape, and is made of, for example, aluminum die cast. On the upper surface of the gas meter main body 5, there are a cylindrical inlet 51 and an outlet 52 which are connected to respective gas pipes extending to the gas supply source side and the gas consumption source side.
Is provided. The gas flowing in from the inflow port 51 flows out to the outflow port 52 side through the flow path 53 formed in the U-shaped gas meter body 5 when viewed from the front. This channel 5
A rectifier accommodating portion 54 corresponding to the shapes of the rectifiers 1 and 1'is formed in the middle of 3.

The rectifier accommodating portion 54 is, in detail, the first mesh unit 11, the second mesh unit 12 and the rectifying plate unit 13 which compose the rectifier 1, or the first mesh unit 11 'which composes the rectifier 1'. , A first mesh unit accommodating portion 541, a second mesh unit accommodating portion 542, and a rectifying plate unit accommodating portion 5 respectively corresponding to the second mesh unit 12 and the rectifying plate unit 13.
It is composed of 43. In particular, the flow-rectifying unit accommodating portion 543 is provided with a circular sensor hole 544 corresponding to the measurement surface of a flow rate sensor for detecting the flow rate of gas passing through the flow path 53, for example, a microflow sensor (not shown). It is being done.

The gas meter body 5 also includes related parts 55A, 55 such as a shutoff valve device, a pressure detector, and a vibration sensor.
B and 55C are arranged at predetermined positions. Further, a plurality of batteries 56 for supplying power to the above-mentioned related components 55A, 55B, 55C and a microcomputer for performing various processes such as flow rate detection are arranged in the central portion of the gas meter body 5. Further, the gas meter body 5 includes the related parts 55A, 55B, 55C and
A plurality of screw fastening portions 57A, 57B, 57C, 57D for fixing the front cover and the back cover (not shown) with screws.
Is provided.

The above-described rectifiers 1 and 1'can be mounted on the gas meter main body 5 having such a shape. That is,
The rectifying plate 141 included in the rectifiers 1 and 1'is the sensor hole 54 of the rectifier housing portion 54 of the gas meter body 5 shown in FIG.
The rectifiers 1 and 1 ′ are mounted from the rear surface of the gas meter body 5 so as to face the gas meter 4.

Then, in this way, the rectifiers 1 and 1 '
On the back side of the gas meter body 5 to which is mounted, a back cover (not shown) is covered here, and is screwed using a plurality of screw fastening portions 57B. Similarly, on the front side of the gas meter main body 5 as well, a surface on which a display window, a reset switch, etc. are arranged, with an electronic board on which an indicator (not shown here) for displaying an integrated flow rate, the microcomputer, etc., is sandwiched. The cover is covered and screwed by using the plurality of screw fastening portions 57D. In this way, the assembly of the gas meter with the rectifiers 1 and 1'installed is completed.

In such a gas meter, the gas flow rate passing through the flow path 53 detected by the flow rate sensor is
Here, a microcomputer (not shown) integrates and the value is displayed on the display. Further, when the flow rate or the like is abnormal, the flow path 53 is shut off by the shut-off valve device instructed by the microcomputer.

The rectifier equipped with the gas meter as described above and including the mesh unit shown in the first and second embodiments operates effectively. That is, as described above, since the mesh is fixed in a state where an appropriate tension is applied and the tension is uniformly maintained, the rectification accuracy and the detection accuracy are stable, and the flow rate of a gas meter or the like is stable. The individual difference of the measuring device can be made very small. Further, unlike the conventional case, the occurrence of the disturbance due to the step is eliminated.
Further, similarly in the third embodiment, since a plurality of meshes are fixed in a state where the tension is kept uniform, the rectification accuracy and the detection accuracy are stable, and the individual difference of the flow rate measurement device is extremely small. You will be able to make it smaller.

The present invention does not limit the shape of the frame, the shape of the mesh, the number of meshes, etc. to those shown in the above embodiment, and can be changed as appropriate without departing from the spirit of the present invention. is there. In addition to the gas meter, the mesh unit of each of the above-described embodiments can be applied to other flow rate measuring devices such as a conventional membrane meter.

[0072]

As described above, according to the first aspect of the invention, the inner frame body 11a is formed at the outer edge of the opening of the inner frame body 11a which constitutes the present rectifying mesh unit 11.
The first taper surface 11a1 and the second taper surface 11a2 are provided so as to have an outer diameter smaller than that of the outer surface. Then, the first taper surface 11a1 and the second taper surface 1
1a2 is formed to have a step slightly smaller than the thickness of the bent piece 15A1, and the outer diameter of the first tapered surface 11a1 is equal to the step, and the outer diameter of the first tapered surface 11a1 is equal to that of the second tapered surface 11a2.
Larger than the outer diameter of. Then, the outer frame body 11b is fitted to the first tapered surface 11a1 such that the inner wall of the outer frame body 11b and the second tapered surface 11a2 sandwich the plurality of bent pieces 15A1 of the rectifying mesh 15A. . Therefore,
The rectifying mesh 15A can be reliably fixed to the outer frame body 11b forming the mesh unit 1 while maintaining the tension of the rectifying mesh 15A uniform. As a result,
The rectification accuracy and the flow rate detection accuracy are stable, and individual differences in the flow rate measuring device can be reduced. Further, since the outer frame body 11b may be assembled so as to fit into the inner frame body 11a, the number of assembling steps can be reduced.

According to the second aspect of the present invention, in the middle frame body 11a of the present rectifying mesh unit 11, the first tapered surface 11a1 of the other opening is also provided on the outer edge of the other opening.
Also, since the third taper surface 11a2 and the second taper surface 11a2 have the same third taper surface and fourth taper surface, respectively, another rectifying mesh 15B can be similarly sandwiched here. Therefore, in addition to the rectifying mesh 15A, the rectifying mesh 15B can be used as a rectifying element, and a higher rectifying effect can be obtained with a simple configuration. In particular, the other rectifying unit 13 is attached to the middle frame 11a.
The outer frame body 11c with the locking pieces having the locking pieces 111 and 113 locked in the locking groove 131 of the above is fitted to hold the rectifying mesh 15B, so that the rectifying mesh unit 11 can be provided with other Rectifier unit (rectifier plate unit, etc.) 13
Can also be connected, and a higher rectification effect can be obtained.

According to the third aspect of the invention, the middle frame body 11
The outer surface of each of the a and the outer frame body 11b and the inner frame body 11a and the outer frame body with a locking piece 11c forms the same plane when they are integrated. In addition to the effects of the first and second aspects of the invention, mounting on the flow rate measuring device becomes easy.

According to the invention described in claim 4, a tapered surface 11a2 having an outer diameter smaller than that of the outer surface of the middle frame 11a forming the outer shape of the rectifying mesh unit 11 is provided around the tapered surface 11a2. The bent piece 15A1 of the rectifying mesh 15A is additionally provided, and the outer frame body 11b is fitted to the tapered surface 11a2 such that the inner wall of the outer frame body 11b and the tapered surface 11a2 sandwich the plurality of bent pieces 15A1. Therefore, the rectifying mesh 15A can be reliably fixed to the inner frame body 11b of the mesh unit 1 while maintaining the tension of the rectifying mesh 15A uniform. As a result, the rectification accuracy and the flow rate detection accuracy are stable, and individual differences in the flow rate measurement device can be reduced. Further, since the outer frame body 11b may be assembled so as to fit into the inner frame body 11a, the number of assembling steps can be reduced.

According to the fifth aspect of the present invention, in the present rectifying mesh unit 11 ', a part of the opening of the frame 11a' and the triangular rib 115 'having a triangular cross section formed in the opening are formed. Since the rectifying mesh 15A 'is configured to be welded to the inner side surface, the rectifying mesh 15A' can be reliably held while maintaining a uniform tension with a simple structure.
Can be fixed to the frame 11a '. As a result, the rectification accuracy and the flow rate detection accuracy are stable, and individual differences in the flow rate measurement device can be reduced. In particular, the triangular rib 115 'having a triangular cross-section ensures good initial biting of the rectifying mesh 15A' and allows a part of the melted frame 11a 'to rotate sufficiently.

According to the sixth aspect of the invention, the frame body 11a 'of the present rectifying mesh unit 11' has a triangular rib similar to the triangular rib 115 'in the other opening, and another rectifying unit 13'. A pair of locking pieces 1 locked in the locking groove 131
Since 11 'and 113' are provided, not only the rectifying mesh 15A 'but also the rectifying mesh 15B' can be used as a rectifying element, and a higher rectifying effect can be obtained with a simple structure. Become. Particularly, since the rectifying mesh unit 11 'has the locking pieces 111' and 113 'which are locked in the locking grooves 131 of the other rectifying unit 13,
The rectifying unit 13 such as a rectifying plate unit can also be connected, and a higher rectifying effect can be obtained.

According to the seventh aspect of the present invention, the triangular rib 11 having a triangular cross section at the opening of the tubular frame 11a 'having a predetermined length which constitutes the outer shape of the rectifying mesh unit 11.
Since 5'is formed and the rectifying mesh 15A 'is welded to the inner side surface of the triangular rib 115' and a part of the opening, the tensioning condition is kept uniform by a simple method.
The rectifying mesh 15A 'can be surely fixed to the frame 11a'. As a result, the rectification accuracy and the flow rate detection accuracy are stable, and individual differences in the flow rate measurement device can be reduced.

According to the invention described in claim 8, the triangular rib 1
Since the welding strength can be controlled by adjusting the cross-sectional area of 15 ', the rectifying mesh 15 made of various materials is used.
It is possible to easily deal with A'and the frame 11a '.

According to the ninth aspect of the present invention, in the present rectifying mesh unit 3, the tubular first outer frame body 31, second outer frame body 32, middle frame body 33, and inner frame body 34 are The first rectifying mesh 15D, the second rectifying mesh 15E and the first rectifying mesh 15D are sandwiched and integrated. That is, the first outer frame body 31 and the middle frame body 33 are combined so that the first rectifying mesh 15D is sandwiched and the groove portion 33b and the claw portion 31b are engaged with each other, and the second rectifying mesh 15E is sandwiched in between. Frame 33 and inner frame 3
4, the second outer frame body 32 and the inner frame body 34 are sandwiched so that the second outer frame body 32 covers the inner frame body 34 by using the inclined side surfaces 34e and 32e. And the resin 3 is attached to the resin inflow portion 35 formed by the resin inflow flanges 33f and 32f.
6 is poured and integrated. With such a configuration, it is possible to reliably fix the plurality of rectifying meshes 15D, 15E, 15E in the mesh unit 3 while maintaining the tensioned condition uniformly. As a result, the rectification accuracy and the flow rate detection accuracy are stable, and individual differences in the flow rate measurement device can be reduced.

According to the tenth aspect of the invention, between the inclined portion 33a provided around the opening of the middle frame body 33 constituting the rectifying mesh unit 3 and the inclined portion 31a of the first outer frame body 31. The end portion of the first rectifying mesh 15D is sandwiched between, and the inwardly facing claw portion 31b formed on the first outer frame body 31 is engaged with the groove portion 33b provided around the edge portion near the opening of the middle frame body 33. Therefore, it is possible to reliably fix the rectifying mesh 15D to the first outer frame 31 while keeping the tension of the rectifying mesh 15D uniform. Also,
Since the first outer frame body 31 is fixed to the middle frame body 33 with the rectifying mesh 15D sandwiched only by the engagement of the claw portion 31b and the groove portion 33b, the number of assembling steps can be reduced.

According to the invention of claim 11, the middle frame 3
The inner frame body 33 is configured such that the end portions of the second rectifying mesh 15E are sandwiched between the first fitting portions 33c and 34c that are formed so as to be fitted into the opening portions of the inner frame body 34 and the inner frame body 33, respectively. The second fitting portions 34d, 32d formed on the opening of the inner frame 34 and the second outer frame 32 while being attached to the body 34
Is attached so that the end portion of the third rectifying mesh 15F is sandwiched between the second outer frame body 32 and the inner frame body 34, and the resin inflow flanges 3 of the middle frame body 33 and the second outer frame body 32 are attached.
Since the resin 36 is poured into the resin inflow portion 35 formed by 3f and 32f, the plurality of rectifying meshes 1
5E and 15E can be reliably fixed in the mesh unit 3 while maintaining the tensioned condition uniformly.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a rectifying mesh unit of the present invention.

FIG. 2 is an exploded perspective view of the rectifying mesh unit of FIG.

3 (A) and FIG. 3 (B) are an exploded perspective view showing a second embodiment of a rectifying mesh unit of the present invention and an enlarged sectional view taken along line AA of FIG. 3 (A), respectively.

FIG. 4 is a schematic perspective view showing an example of a horn of the ultrasonic welding machine according to the second embodiment of FIG.

FIG. 5 is a cross-sectional view showing a third embodiment of a rectifying mesh unit of the present invention.

FIG. 6 is a plan view showing an example of a gas meter main body of a gas meter to which the rectifier shown in the first embodiment and the second embodiment is attached.

FIG. 7 is a rear view of the gas meter of FIG.

8 is a sectional view taken along line XX in FIG.

9 (A) and 9 (B) are a schematic perspective view showing a first conventional example and a schematic cross-sectional view showing a second conventional example, respectively.

[Explanation of symbols]

1 rectifier 11 1st mesh unit 11a Middle frame 11a1 first tapered surface 11a2 second taper surface 11b outer frame 11c Outer frame with locking piece 12 2nd mesh unit 13 Rectifying plate unit 14 Current plate 15A, 15B, 15C Rectifying mesh 15A1 bent piece 111 locking piece 131 locking groove

Claims (11)

[Claims] 1. A rectifying mesh unit that is installed in the flow path of a flow rate measuring device and rectifies a fluid whose flow rate is detected by a flow rate sensor, wherein the fluid has a tubular shape of a predetermined length through which the fluid passes. A frame body, and a first taper surface and a second taper surface circumferentially provided at an outer edge portion of at least one opening of the middle frame body with an outer diameter smaller than an outer surface of the middle frame body. An outer frame body fitted to the first tapered surface; and a rectifying mesh having a bending piece attached to the second tapered surface and covering the opening, the first tapered surface and The second tapered surface is formed so as to have a step slightly smaller than the thickness of the bent piece, and the outer diameter of the first tapered surface is the outer diameter of the second tapered surface by an amount corresponding to this step. The bent piece is sandwiched between the inner wall of the outer frame and the second tapered surface. As described above, the rectifying mesh unit, wherein the outer frame body is fitted to the first tapered surface. 2. The rectifying mesh unit according to claim 1, wherein the middle frame body has a third taper on the outer edge of the other opening, which is similar to the first taper surface and the second taper surface, respectively. An outer frame body with a locking piece, which has a surface and a fourth tapered surface, and which is fitted to the third tapered surface and has a pair of locking pieces that are locked in the locking grooves of another rectifying unit, A bending mesh attached to the fourth tapered surface, further comprising a rectifying mesh covering the other opening, and the inner wall of the outer frame with the locking piece and the fourth tapered surface. The outer frame body with the locking piece is fitted to the third tapered surface so as to sandwich a bent piece of another rectifying mesh similar to the rectifying mesh that covers the other opening. A rectifying mesh unit characterized by that. 3. The rectifying mesh unit according to claim 2, wherein the outer surface of each of the inner frame body and the outer frame body, and the inner frame body and the outer frame body with the locking piece are A rectifying mesh unit characterized by forming the same surface when integrated. 4. A method for fixing a mesh for rectifying a fluid, whose flow rate is detected by a flow sensor, to a frame of a rectifying mesh unit, the mesh being mounted in the flow path of a flow measuring device, the rectifying mesh unit comprising: A tapered surface having a smaller outer diameter than the outer surface of the middle frame is provided around the outer edge of the opening of the cylindrical middle frame having a predetermined length, and the opening is formed on the tapered surface. A bent piece formed by bending is formed on the rectifying mesh covering the rectifying mesh, and the bent piece is sandwiched between the inner wall of the outer frame body and the tapered surface, and the outer frame body is formed on the tapered surface. A method for fixing a rectifying mesh, which is characterized by fitting. 5. A rectifying mesh unit that is installed in the flow path of a flow rate measuring device and rectifies a fluid whose flow rate is detected by a flow rate sensor, the tubular frame having a predetermined length through which the fluid passes. A body, a triangular rib having a triangular cross-section formed in at least one opening of the frame body so as to circulate slightly larger than the inner side surface of the frame body, and the same shape as the portion surrounded by the triangular rib. And a rectifying mesh fitted in this portion, wherein the rectifying mesh is welded to the inner side surface of the triangular rib and a part of the opening. . 6. The rectifying mesh unit according to claim 5, wherein the frame body is also locked to a triangular rib similar to the triangular rib in the other opening and a locking groove of another rectifying unit. A pair of locking pieces, and another rectifying mesh similar to the rectifying mesh is welded to the inner side surface of the triangular rib of the other opening and a part of the opening. A rectifying mesh unit to be used. 7. A method for fixing a mesh for rectifying a fluid, whose flow rate is detected by a flow sensor, to a frame body of a rectifying mesh unit, the mesh being mounted in the flow path of a flow measuring apparatus, the rectifying mesh unit comprising: A triangular rib having a triangular cross-section is formed in the opening of a tubular frame body having a predetermined length to form the outer shape of the frame body so as to circulate slightly larger than the inner side surface of the frame body,
A method for fixing a rectifying mesh, characterized in that a rectifying mesh having the same shape as a portion surrounded by the triangular rib is welded to an inner surface of the triangular rib and a part of the opening. 8. The rectifying mesh unit according to claim 7, wherein the welding strength is controlled by adjusting the cross-sectional area of the triangular rib. 9. A rectifying mesh unit that is installed in a flow path of a flow rate measuring device and rectifies a fluid whose flow rate is detected by a flow rate sensor. And a tubular first outer frame body, second outer frame body, middle frame body, and inner frame body that form the first outer frame body, and one opening portion of the first outer frame body and the middle frame body, respectively. A first rectifying mesh whose ends are sandwiched and fixed between the inclined portions, a groove portion provided around an edge portion near one opening of the middle frame body, and the first outer frame body A claw portion that is formed on the first fitting portion that is engageable with the groove portion and the other opening portion of the inner frame body and one opening portion of the inner frame body, respectively. A second rectifying mesh that is sandwiched and fixed, and the other opening of the inner frame and the first rectifying mesh. 2 A third rectifying mesh whose ends are sandwiched and fixed to second fitting portions which are respectively formed so as to be able to be fitted to a part of the inner surface of the outer frame, and the outer surface of the inner frame and the mesh. Sloped side surfaces formed respectively corresponding to the inner side surfaces of the second outer frame body, resin inflows protruding from the edge portion near the other opening of the middle frame body and the edge portion of the second outer frame body, respectively. A second flange, and the first outer frame body and the middle frame body are combined so as to sandwich the first rectifying mesh and engage the groove portion and the claw portion, and the second rectifying mesh is provided. The middle frame and the inner frame are combined so as to sandwich the
The second outer frame body and the inner frame body are combined so that the second outer frame body covers the inner frame body by sandwiching the rectifying mesh and utilizing the inclined side surface, and the resin inflow flange A rectifying mesh unit in which a resin is poured into a resin inflow portion formed by, and is integrated. 10. A method of fixing a mesh for rectifying a fluid, the flow amount of which is detected by a flow sensor, to a rectifying mesh unit, the mesh being mounted in a flow path of a flow measuring device, the outer shape of the rectifying mesh unit comprising: A first rectification is provided between an inclined portion that is provided around one opening of the tubular middle frame body that forms a part and an inclined portion of the first outer frame body that is formed corresponding to this inclined portion. An end portion of the mesh for use is sandwiched, and an inwardly facing claw portion formed on the first outer frame body is engaged with a groove portion provided around an edge portion near one opening of the middle frame body. How to fix the rectifying mesh. 11. The method for fixing a rectifying mesh according to claim 10, wherein the mesh can be fitted into the other opening of the middle frame and one opening of a cylindrical inner frame having an inclined outer surface. The inner frame body is attached to the inner frame body so that the end portion of the second rectifying mesh is sandwiched by the first fitting portion formed in the inner frame body, and the other opening portion of the inner frame body and the cylindrical first 2 The end of the third rectifying mesh is sandwiched between the second fitting portions that are formed so that they can be fitted to a part of the inner surface of the outer frame, and the second outer frame covers the inner frame. And then pouring the resin into the resin inflow portion formed by the resin inflow flanges protruding from the edge portion near the other opening of the middle frame body and the edge portion of the second outer frame body, respectively. A characteristic method for fixing the rectifying mesh.