JP7388862B2 - Gas meter and gas meter manufacturing method - Google Patents

Description

The present invention relates to a gas meter and a method for manufacturing a gas meter in which foreign matter contained in gas piping is removed in front of a flow rate measuring section.

This type of gas meter is disclosed in Patent Document 1. This gas meter has a shutoff valve and a flow rate measuring section disposed in a flow path that communicates with a gas inlet and an outlet. A filter for removing foreign matter is provided upstream of the shutoff valve and the flow rate measuring section, and this filter removes foreign matters such as dust in front of the flow rate measuring section, thereby improving the accuracy of flow rate measurement.

Further, Patent Document 2 discloses a gas meter equipped with a labyrinth structure and a mesh structure that equalizes the positional flow velocity distribution and temporal pulsating flow changes within the cross section of the gas passage on the upstream side of the flow measurement sensor of the gas passage. has been done.

Japanese Patent Application Publication No. 2004-101303 Japanese Patent Application Publication No. 11-183208

However, in the conventional gas meter, a filter for removing foreign matter is installed on the upstream side of the shutoff valve and the flow rate measuring section, and a labyrinth structure and a mesh structure are arranged. Therefore, the measurement function may be inhibited due to an increase in gas pressure loss or blockage of the gas passage due to clogging of the filter, mesh structure, or the like.

Therefore, the present invention has been made to solve the above problems, and provides a gas meter that can remove foreign substances contained in gas, suppress increase in gas pressure loss, and maintain measurement function. and to provide a method for manufacturing a gas meter.

A gas meter according to an aspect of the present invention includes a casing having a gas inlet and an outflow port, a flow rate measuring section that measures the flow rate of the gas flowing within the casing, and a cutoff that blocks the flow of gas within the casing. a valve, wherein at least one wall for removing foreign matter contained in the gas and at least one slope are provided at a portion where the gas flowing from the inflow port in the housing hits. It is provided with a flow path having a section.

It is preferable to have a flow path provided with a plurality of walls and sloped portions for removing the foreign matter.

It is preferable that a continuous porous member for adsorbing foreign matter contained in the gas is provided between the flow path having the wall for removing foreign matter and the inclined part and the flow rate measuring section.

The flow path having a wall for removing foreign matter and an inclined portion is a flow path assembly installed below from the gas inlet in the housing, and the flow path assembly includes a bottom wall portion and a front wall portion. a passage main body that forms an upper surface opening and a rear surface opening with a portion and both side walls; a lid body having a cylindrical portion that covers the upper surface opening of the passage body; a cylindrical inlet passage structure serving as an inlet for gas; a plurality of walls for removing foreign matter are provided on the upper surface of the bottom wall portion of the passage main body; and walls for removing foreign matter are provided on the lower surface of the lid body; It is preferable that a plurality of inclined parts are provided so as to alternately face the foreign matter removal wall.

It is preferable that the passage main body has a member accommodating portion that holds the continuous porous member.

It is preferable that the cylindrical part of the lid body has an engaging part, and the inlet passage structure has a locking part that is engaged with and detached from the engaging part.

A method of manufacturing a gas meter according to another aspect of the present invention is a method of manufacturing a gas meter including the flow path assembly, wherein a cylindrical passage portion of the inlet passage structure is connected to a gas inlet of the casing. The continuous porous member is inserted and assembled from the inside of the casing, then the continuous porous member is accommodated and held in the member accommodating portion of the passage main body, and then the lid body is assembled to the passage main body to combine. Later, by engaging the engaging portion of the lid assembled to the passage main body with the locking portion of the inlet passage structure assembled to the inlet, the flow path is closed. This is a manufacturing method in which assemblies are assembled.

According to the present invention, when gas containing foreign matter passes through a flow path, the foreign matter can be removed by the foreign matter removal wall and the inclined portion, and an increase in gas pressure loss can be suppressed. and a method for manufacturing a gas meter.

1 is a schematic cross-sectional view showing an example of a gas meter according to a first embodiment of the present invention. (a) is a perspective view of a channel assembly used in the gas meter, and (b) is a plan view of the channel assembly. (a) is a side view of the channel assembly, (b) is a rear view of the channel assembly, and (c) is a sectional view taken along the line XX in the same figure (b). (a) is a perspective view of the passage main body of the passage assembly, (b) is a plan view of the passage main body, (c) is a side view of the passage main body, and (d) is a rear view of the passage main body. (a) is a perspective view of the lid of the channel assembly, (b) is a plan view of the lid, (c) is a side view of the lid, and (d) is a rear view of the lid. (a) is a perspective view of the inlet passage structure of the channel assembly, (b) is a plan view of the inlet passage structure, (c) is a side view of the inlet passage structure, and (d) is a perspective view of the inlet passage structure. FIG. It is a schematic sectional view showing an example of the gas meter concerning a 2nd embodiment of the present invention. It is a schematic sectional view showing an example of a gas meter concerning a 3rd embodiment of the present invention. It is an exploded perspective view of the gas meter of the above-mentioned 3rd embodiment. (a) is a plan view of the passage main body of the flow path assembly used in the gas meter of the third embodiment, (b) is a sectional view taken along the line BB in figure (a), and (c) is the same as figure (a). FIG. 3 is a sectional view taken along the middle line CC. (a) is a side view of the passage body of the passage assembly of the third embodiment, (b) is a bottom view of the passage body, (c) is a rear view of the passage body, and (d) is D in Figure (a). -D is a cross-sectional view taken along line D, and (e) is a cross-sectional view taken along line E-E in Figure (a). (a) is a plan view of the lid of the flow path assembly of the third embodiment, (b) is a cross-sectional view taken along line BB in FIG. (a), and (c) is a rear view of the lid. (a) is a side view of the lid of the flow path assembly of the third embodiment, (b) is a bottom view of the lid, and (c) is a sectional view taken along line CC in FIG. 3(a). (a) is a plan view of the inlet passage structure of the flow path assembly, (b) is a side view of the inlet passage structure, (c) is a sectional view taken along line CC in figure (b), (d) is a sectional view taken along the line DD in FIG. (a) is a rear view of the inlet passage structure of the flow path assembly of the third embodiment, (b) is a bottom view of the inlet passage structure, and (c) is an enlarged view of portion C in figure (b). (a) is a schematic sectional view showing a state in which the inlet passage structure is being assembled to the gas inlet of the gas meter casing of the third embodiment, and (b) is a schematic sectional view showing the state in which the inlet passage structure is being assembled to the inlet passage structure. FIG. 3 is a schematic cross-sectional view showing a state in which the passage main bodies are assembled and combined.

EMBODIMENT OF THE INVENTION Hereinafter, the gas meter based on embodiment of this invention is demonstrated in detail using drawing.

FIG. 1 is a schematic sectional view showing an example of a gas meter according to the first embodiment of the present invention, FIG. 2(a) is a perspective view of a flow path assembly used in the gas meter, and FIG. 2(b) is a plan view of the flow path assembly. , FIG. 3(a) is a side view of the flow path assembly, FIG. 3(b) is a rear view of the flow path assembly, FIG. 3(c) is a sectional view taken along line XX in FIG. 3(b), FIG. (a) is a perspective view of the passage main body of the channel assembly, Fig. 4 (b) is a plan view of the passage main body, Fig. 4 (c) is a side view of the passage main body, and Fig. 4 (d) is a rear view of the passage main body, 5(a) is a perspective view of the lid of the channel assembly, FIG. 5(b) is a plan view of the lid, FIG. 5(c) is a side view of the lid, and FIG. 5(d) is a rear view of the lid. 6(a) is a perspective view of the inlet passage structure of the channel assembly, FIG. 6(b) is a plan view of the inlet passage structure, and FIG. 6(c) is a side view of the inlet passage structure. (d) is a rear view of the inlet passage structure.

As shown in FIG. 1, the gas meter 10 includes a housing 11 having an inlet 15 and an outlet 16 for gas G, a flow rate measuring section 17 that measures the flow rate of gas G flowing inside the housing 11, and a housing. A cutoff valve 18 that cuts off the flow of gas G in 11 is provided. Further, the gas meter 10 is arranged between a portion (bottom wall portion 11c) where the gas G flowing in from the inlet 15 in the housing 11 hits and the inlet 15, and is configured to remove foreign substances P contained in the gas G. A channel assembly (channel) 20 having a removal wall 27 and an inclined portion 28c is provided.

The casing 11 includes a rectangular cylindrical main body 11a with a bottom (bottom wall 11c) and a side opening 11b, and a rectangular plate-like body assembled to close the side opening 11b of the main body 11a. It has a lid body (not shown). A cylindrical inlet 15 and a cylindrical outlet 16 are respectively projected from the upper wall portion 11d of the housing 11. Further, a channel assembly 20 having an L-shaped side surface is detachably assembled below the inlet 15 in the housing 11 . Further, a flow rate measuring section 17 is attached to the upper wall portion 11d of the housing 11 on the outlet port 16 side via a cutoff valve 18.

The flow rate measurement unit 17 measures the flow rate of the gas G flowing through the gas passage 13 from the gas G inlet 15 to the gas outlet 16 using, for example, an ultrasonic sensor (not shown). Further, the shutoff valve 18 shuts off the gas G flowing toward the outlet 16 by pressing a valve rubber body (not shown) against a valve seat (not shown).

As shown in FIGS. 2(a), (b) and 3(a), (b), and (c), the channel assembly 20 as a channel has a wall 27 for removing foreign matter and an inclined portion 28c. , are arranged extending from the gas G inlet 15 side of the upper wall portion 11d of the housing 11 to the bottom wall portion 11c side of the main body portion 11a. As shown in FIGS. 2(a), (b) and 3(a), (b), and (c), the channel assembly 20 includes a channel body 21, a lid 28, and an inlet channel structure. 29.

As shown in FIGS. 4(a), (b), (c), and (d), the passage main body 21 includes a rectangular plate-shaped bottom wall 22, a curved front wall 23, both side walls 24, 24, and a top opening 25 and a rear opening 26 are formed between these parts. A pair of walls 27 for removing foreign matter are provided on the upper surface of the bottom wall portion 22 of the passage main body 21 at a predetermined distance apart. The pair of walls 27, 27 for removing foreign matter are integrally formed in a rectangular plate shape between the side wall parts 24, 24 so as to stand vertically from the upper surface of the bottom wall part 22. Moreover, triangular notches 24a are formed at the center of the upper surface opening 25 and on the rear surface opening 26 side of each inner surface of the side walls 24,24. Furthermore, as shown in FIG. 4(c), the walls 27 for removing foreign matter and the triangular notches 24a are located alternately (in a staggered manner).

As shown in FIGS. 5(a), (b), (c), and (d), the lid 28 has a square shape that covers the curved front wall 23 side of the upper opening 25 of the passage main body 21. It has a cylindrical portion 28a and a rectangular plate portion 28b that covers the rear side of the upper surface opening 25 from the center thereof. On the lower surface of this rectangular plate portion 28b, a pair of triangular convex inclined portions 28c, 28c, which fit between each pair of triangular notches 24a, 24a of the side walls 24, 24 of the passage main body 21, are integrally protruded. has been done. As shown in FIG. 3(c), a triangular convex inclined portion 28c of the lid body 28 is disposed between a pair of walls 27, 27 for removing foreign matter in the passage main body 21. A zigzag passage for the gas G is formed by the pair of inclined parts 28c, 28c of the lid body 28 and the pair of walls 27, 27 for removing foreign matter of the passage main body 21. Thereby, the foreign matter P contained in the gas G hits the foreign matter removal wall 27 and the inclined portion 28c, accumulates on the bottom wall portion 22 of the passage main body 21, and is removed.

As shown in FIGS. 6(a), (b), (c), and (d), the inlet passage structure 29 serves as the inlet 15, which is an inlet passage for the gas G. That is, the inlet passage structure 29 includes a cylindrical passage part 29a that is above the inlet 15 for the gas G, and is integrally formed with this passage part 29a via an upper wall part 29b. It has a rectangular cylindrical passage portion 29c which is assembled into the gas G inflow port 15 and forms the lower side of the gas G inflow port 15.

As shown in FIG. 1, a gas supply pipe (meter connection pipe) 12 is connected to the gas G inlet 15 (29) of the casing 11 of the gas meter 10, and a gas G outflow port of the casing 11 is connected to the gas G inlet 15 (29) of the casing 11 of the gas meter 10. 16 is connected to the gas exhaust pipe 14. Then, foreign matter P such as rust on the gas supply pipe 12 contained in the gas G is removed by the pair of foreign matter removal walls 27, 27 of the flow path assembly 20 and the pair of inclined portions 28c, 28c. Furthermore, as shown by the dotted line in FIG. 1, the gas passage 13 in the housing 11 extends from the inlet 15 for the gas G, passes through the passage assembly 20, and curves downward to the cutoff valve 18 and the flow rate measuring section 17. The flow path is from the flow rate measurement section 17 to the outflow port 16 via the cutoff valve 18.

According to the gas meter 10 of the first embodiment, as shown in FIG. The gas flows into the flow path assembly 20, which is a gas flow path. Due to this inflow, the foreign matter P is removed by the pair of foreign matter removal walls 27, 27 provided in the passage main body 21 of the channel assembly 20 and the pair of inclined parts 28c, 28c, and the foreign matter P is removed from the bottom wall part 22 of the passage main body 21. Foreign matter P accumulates in the area. Specifically, the wall 27 for removing foreign matter projects vertically from above the bottom wall portion 22 of the passage main body 21, and the inclined portion 28c for removing foreign matter projects obliquely from the lower surface of the lid body 28. Gas G containing foreign matter P such as rust collides with the foreign matter removal wall 27 and the inclined portion 28c. At this time, foreign matter P is deposited on the bottom wall portion 22 around the foreign matter removal wall 27. Further, the gas passage 13 in the passage assembly 20 is a zigzag passage between the wall 27 for removing foreign matter and the inclined portion 28c. However, unlike the conventional case where a filter or the like is installed, the gas passage 13 is not narrowed and is open, so an increase in pressure loss of the gas G can be suppressed.

In this way, when the gas G containing foreign matter P such as rust passes through the gas passage 13 in the flow path assembly 20, the foreign matter P is deposited on the bottom wall portion 22 around the foreign matter removal wall 27. By removing the foreign matter P from the gas G, the amount of foreign matter P flowing into the flow rate measuring section 17 is reduced as much as possible. This reduction makes it possible to suppress the influence of the foreign matter P on flow measurement (such as an increase in measurement error due to the foreign matter P). Further, since it is possible to prevent foreign matter P from adhering to the cutoff valve 18, it is possible to prevent gas from leaking toward the outlet 16 when the cutoff valve 18 shuts off the gas.

FIG. 7 is a schematic cross-sectional view showing an example of a gas meter according to the second embodiment of the present invention.

The gas meter 10' of the second embodiment has an open cell that adsorbs foreign matter P such as rust of the gas supply pipe 12 contained in the gas G in the gas passage 13 between the flow path assembly 20 and the flow rate measuring section 17. This embodiment differs from the first embodiment in that it includes a continuous porous member 30 such as a sponge. Note that the other configurations are similar to those of the first embodiment, so the same components are denoted by the same reference numerals and detailed explanations will be omitted.

In the gas meter 10' of the second embodiment, as in the first embodiment, when the gas G containing foreign matter P such as rust passes through the gas passage 13 in the flow path assembly 20, the foreign matter P is The foreign matter P deposited on the bottom wall portion 22 around the removal wall 27 is removed from the gas G. By this removal, the amount of foreign matter P flowing into the flow rate measuring section 17 can be reduced as much as possible, and the influence of foreign matter P on flow measurement (such as an increase in measurement error due to foreign matter P) can be suppressed. .

Further, by arranging the continuous porous member 30 that adsorbs foreign matter P on the downstream side of the gas passage 13 of the flow path assembly 20, the amount of foreign matter P can be further removed and reduced. In this case, even if the inside of the porous portion of the continuous porous member 30 is filled with foreign matter P, the gas passage 13 is not blocked, so that the function as the gas meter 10' can be maintained.

FIG. 8 is a schematic cross-sectional view showing an example of a gas meter according to a third embodiment of the present invention. FIG. 9 is an exploded perspective view of the gas meter. 10(a) is a plan view of the passage main body of a flow path assembly used in a gas meter, FIG. 10(b) is a sectional view taken along line BB in FIG. 10(a), and FIG. a) A sectional view taken along the middle line CC. 11(a) is a side view of the passage main body of the channel assembly, FIG. 11(b) is a bottom view of the passage main body, FIG. 11(c) is a rear view of the passage main body, and FIG. 11(d) is FIG. 11(a). 11(e) is a sectional view taken along line EE in FIG. 11(a). FIG. 12(a) is a plan view of the lid of the channel assembly, FIG. 12(b) is a sectional view taken along line BB in FIG. 12(a), and FIG. 12(c) is a rear view of the lid. . 13(a) is a side view of the lid, FIG. 13(b) is a bottom view of the lid, and FIG. 13(c) is a sectional view taken along line CC in FIG. 13(a). 14(a) is a plan view of the inlet passage structure of the channel assembly, FIG. 14(b) is a side view of the inlet passage structure, and FIG. 14(c) is taken along line CC in FIG. 14(b). 14(d) is a sectional view taken along the line DD in FIG. 14(a). 15(a) is a rear view of the inlet passage structure of the channel assembly, FIG. 15(b) is a bottom view of the inlet passage structure, and FIG. 15(c) is an enlarged view of portion C of FIG. 15(b). . FIG. 16(a) is a schematic cross-sectional view showing a state in which the inlet passage structure is being assembled to the gas inlet of the gas meter housing, and FIG. 16(b) is a passage in which the lid is assembled to the inlet passage structure. It is a schematic cross-sectional view showing a state in which the main body is assembled and combined.

In the gas meter 10A of the third embodiment, a flow path assembly 20 accommodates and holds a continuous porous member 30 such as an open-cell sponge that adsorbs foreign matter P such as rust of the gas supply pipe 12 contained in the gas G. This embodiment differs from the first embodiment in that it includes a member accommodating portion 22a. Note that the other configurations are the same as those of the first embodiment, so the same components will be described with the same reference numerals.

As shown in FIGS. 8 and 9, a gas meter 10A according to the third embodiment includes a metal housing 11 having an inlet 15 and an outlet 16 for gas G, and a flow rate of gas G flowing inside the housing 11. It includes a flow rate measurement section 17 that measures the flow rate, and a cutoff valve 18 that blocks the flow of gas G within the housing 11. The gas meter 10A also includes a foreign matter removal wall 27 that is disposed between the inlet 15 and a portion where the gas G flowing in from the inlet 15 in the housing 11 hits, and that removes foreign matter P contained in the gas G. It further includes a channel assembly 20 having an inclined portion 28c and an inclined plate portion 28d.

As shown in FIGS. 8 and 9, the casing 11 includes a bottomed (bottom wall portion 11c), rectangular cylindrical body portion 11a having a side opening 11b, and a side opening 11b of the body portion 11a. It has a rectangular plate-shaped metal cover (lid body) 19 assembled so as to be closed. A cylindrical inlet 15 and a cylindrical outlet 16 are respectively projected from the upper wall portion 11d of the housing 11. Further, a channel assembly 20 having an L-shaped side surface is detachably assembled below the inlet 15 in the housing 11 . Further, a flow rate measuring section 17 is attached to the upper wall portion 11d of the housing 11 on the outlet port 16 side via a cutoff valve 18.

Further, as shown in FIG. 8, a gas supply pipe (meter connection pipe) 12 is connected to the gas G inlet 15 of the casing 11. Further, a gas exhaust pipe 14 is connected to the gas G outlet 16 of the housing 11 .

The flow rate measurement unit 17 measures the flow rate of the gas G flowing through the gas passage 13 from the gas G inlet 15 to the gas outlet 16 using, for example, an ultrasonic sensor (not shown). Further, the shutoff valve 18 shuts off the gas G flowing toward the outlet 16 by pressing a valve rubber body (not shown) against a valve seat (not shown). Note that, as shown by the dotted line in FIG. 8, the gas passage 13 inside the housing 11 allows the gas G to pass through the flow path assembly 20 from the inlet 15 and diffuse throughout the interior of the housing 11 before measuring the flow rate. The flow path is formed by flowing into the flow rate measuring section 17, passing through the cutoff valve 18, and passing through the outlet 16 from the flow rate measuring section 17.

As shown in FIG. 9, the cover 19 is formed into a rectangular plate shape and closes the side opening 11b of the main body 11a of the housing 11. As shown in FIG. That is, the peripheral edge 19a of the cover 19 is fitted into the side opening 11b of the main body 11a, and closes the side opening 11b of the main body 11a without any gap through a sealing material (not shown). Further, the lower side of the cover 19 is provided with a concave portion 19b in which a battery (not shown) is installed.

Further, as shown in FIG. 8, the flow path assembly 20 as a flow path has a wall 27 for removing foreign matter, an inclined portion 28c, and an inclined plate portion 28d. It is arranged from the inlet 15 side to the bottom wall portion 11c side of the main body portion 11a. As shown in FIGS. 8 and 9, the channel assembly 20 made of synthetic resin is assembled into the casing 11 from the side opening 11b, and includes a channel body 21, a lid 28, and an inlet channel structure. It is equipped with 29 and.

As shown in FIGS. 9, 10(a) to 10(c), and 11(a) to (e), the passage main body 21 includes a bottom wall portion 22 having a substantially rectangular plate shape and a front wall portion 23 having a curved surface shape. and both side wall parts 24, 24, and a top opening 25 and a rear opening 26 are formed between these parts. A pair of walls 27 for removing foreign matter are provided on the upper surface of the bottom wall portion 22 of the passage main body 21 at a predetermined distance apart. The upstream wall 27 of the pair of foreign matter removal walls 27, 27 has an inclined piece part 27a and an upright piece part 27b, and the both side wall parts 24, 24 are arranged so as to stand up from the upper surface of the bottom wall part 22. It is integrally formed with an inverted V-shaped cross section between them. Further, the downstream wall 27 of the pair of foreign matter removal walls 27, 27 is integrally formed in a rectangular plate shape between the both side wall parts 24, 24 so as to stand vertically from the upper surface of the bottom wall part 22. There is. Further, a pair of triangular notches 24a are formed at the center of the upper surface opening 25 and on the rear surface opening 26 side of each inner surface of the side walls 24,24. The upstream notch 24a of the pair of notches 24a, 24a is cut out in a triangular concave shape. Furthermore, the downstream notch 24a of the pair of notches 24a, 24a is completely cut out in a triangular shape. Furthermore, as shown in FIG. 10(b), the walls 27 for removing foreign matter and the triangular notches 24a are located alternately (in a staggered manner).

Further, as shown in FIGS. 9, 10(a) and 10(b), the bottom wall portion 22 of the passage main body 21 is larger than the bottom wall portion 22 of the passage main body 21 of the first embodiment. It extends downward, and this extension serves as a member accommodating portion 22a that accommodates and holds the continuous porous member 30. That is, the member accommodating portion 22a is provided in the shape of a square frame from the notch 24a on the downstream side to the rear opening 26. A pair of front and rear locking protrusions 24b, 24b are integrally formed on both side wall portions 24, 24 forming a frame portion of the member accommodating portion 22a so as to be elastically deformable. Further, a pair of locking protrusions 24c, 24c are integrally formed on the front and rear of the pair of foreign matter removal walls 27, 27 of the side wall portions 24, 24 so as to be elastically deformable. These locking protrusions 24b, 24c are used for locking and fixing when assembling a lid 28, which will be described later.

As shown in FIGS. 9, 12(a) to 12(c), and 13(a) to (c), the lid body 28 is located on the side of the curved front wall portion 23 of the upper surface opening 25 of the passage main body 21. , and a rectangular plate portion 28b that covers the center side of the upper surface opening 25. Furthermore, the lid body 28 includes an inclined plate part 28d that covers the rear side of the upper surface opening 25 of the passage main body 21 from the center thereof, and a widened and extended plate part 28e that covers the upper surface opening 25 from the rear side to the rear end side. It has so that it may continue in a row to the rectangular plate part 28b.

As shown in FIGS. 9, 12(b), and 13(a), the lower surface of the rectangular plate portion 28b of the lid body 28 has a triangular upstream notch on both side walls 24, 24 of the passage main body 21. A triangular convex inclined portion 28c that fits into the portion 24a is integrally formed to protrude. Thereby, the triangular convex inclined portion 28c of the lid body 28 is arranged between the pair of walls 27, 27 for removing foreign matter of the passage main body 21. Further, the lower surface of the inclined plate portion 28d of the lid body 28 contacts the notch portion 24a on the downstream side of the both side wall portions 24, 24 of the passage main body 21, and projects downwardly. As shown in FIG. 8, a zigzag passage for the gas G is formed by the inclined part 28c and the inclined plate part 28d of the lid 28 and the pair of walls 27, 27 for removing foreign matter of the passage main body 21. Thereby, the foreign matter P contained in the gas G hits the foreign matter removal wall 27, the inclined portion 28c, and the inclined plate portion 28d, accumulates on the bottom wall portion 22 of the passage main body 21, and is removed.

As shown in FIGS. 9 and 12(a), the widening extension plate portion 28e of the lid body 28 covers the upper surface opening 25 above the member accommodating portion 22a of the bottom wall portion 22 of the passage main body 21. . A pair of engagement recesses 28f, 28f that engage with a pair of locking protrusions 24b, 24b on both sides of the member accommodating portion 22a of the passage main body 21 are formed at the front and back on both sides of the width expanding extension plate portion 28e. has been done. In addition, the front and rear sides of both sides of the rectangular plate portion 28b of the lid body 28 are engaged with a pair of locking protrusions (locking portions) 24c, 24c, respectively, at the front and back of both sides of the center of both side wall portions 24, 24 of the passage main body 21. A pair of engagement holes 28g, 28g are formed.

Furthermore, as shown in FIGS. 9 and 13(a) to (c), a rectangular notch 28h is formed on one side wall of the square cylindrical portion 28a of the lid body 28, which is located on the opposite side of the cover 19. It is formed. Moreover, a pair of slide grooves 28i, 28i are formed in the front and rear walls of the square tube-shaped tube portion 28a in a concave shape so as to be continuous with both ends of the notch portion 28h. Further, a pair of engagement holes (engagement portions) 28j are formed in the other side wall of the square tube portion 28a of the lid body 28, which is located on the cover 19 side.

As shown in FIGS. 8, 9, 14(a) to 14(d), and 15(a) to (c), the inlet passage structure 29 communicates with the inlet 15, which is an inlet passage for gas G. It is something. That is, the inlet passage structure 29 has a cylindrical passage portion (cylindrical passage portion) 29a that is inserted into the cylindrical inlet 15 for the gas G. In addition, the inlet passage structure 29 further includes a square cylindrical passage part 29c that is integrally formed with the cylindrical passage part 29a via the upper wall part 29b and is assembled to the square cylindrical part 28a of the lid body 28. are doing.

As shown in FIGS. 9, 14(a) to 14(d), and 15(a) to (c), the square cylindrical passage portion 29c of the inlet passage structure 29 is connected to the square cylindrical portion of the lid body 28. It is formed in a size that can be fitted into the portion 28a. A pair of rail parts 29d that slide in the pair of slide grooves 28i, 28i of the square cylindrical part 28a of the lid body 28 are integrally formed on the lower end side of the front and rear walls of the square cylindrical passage part 29c. There is. A locking protrusion (locking portion) 29e that locks into each engagement hole 28j of the rectangular cylinder portion 28a of the lid body 28 is integrally and elastically deformable at each tip of the pair of rail portions 29d, 29d. It is formed protrudingly. When each locking protrusion 29e is locked in each engagement hole 28j, the locking piece 29f of the square cylindrical passage 29c is fitted into the notch 28h of the square cylindrical portion 28a of the lid body 28. It looks like this.

Next, a procedure for assembling the channel assembly 20 will be described using FIG. 9 and FIGS. 16(a) and 16(b).

As shown in FIGS. 9 and 16(a), first, the cylindrical passage portion 29a of the inlet passage structure 29 is inserted into the cylindrical inlet 15 of the casing 11 from inside the casing 11 and assembled. . Next, as shown in FIG. 9, the continuous porous member 30 is accommodated and held in the frame-shaped member accommodating portion 22a of the passage main body 21.

Next, each pair of engagement recesses 28f, 28f and each pair of engagement holes 28g, 28g is engaged, and the lid body 28 is assembled to the passage main body 21 to be combined. After this combination, a pair of locking protrusions 29e, 29e of the inlet passage structure 29 assembled to the cylindrical inlet 15 are fitted with a pair of locking protrusions 29e, 29e of the lid 28 assembled and combined with the passage main body 21. By engaging the matching holes 28j, 28j, assembling of the channel assembly 20 is completed, as shown in FIG. 16(b).

When assembling this channel assembly 20, the pair of slide grooves 28i, 28i of the lid body 28 are inserted into the pair of rail parts 29d, 29d of the inlet passage structure 29, and the notch 28h of the lid body 28 forms the inlet passage. Push the lid 28 deep into the housing 11 until it hits 29f of the body 29. By sliding and pushing the lid 28, the entrance passage structure 29 and the lid 28 are positioned without any gap, and the engagement hole 28j of the lid 28 is smoothly engaged with the locking protrusion 29e of the entrance passage construction 29. can be done. Moreover, the channel assembly 20 can be assembled easily and reliably without the operator having to put his/her hands into the narrow housing 11.

Furthermore, since the continuous porous member 30 can be accommodated and held in the frame-shaped member accommodating portion 22a of the channel body 21 at the stage of assembling the channel assembly 20, parts for fixing the continuous porous member 30 are not required. Accordingly, the number of parts can be reduced and costs can be reduced.

According to the gas meter 10A of the third embodiment, as shown in FIG. The gas flows into the flow path assembly 20, which is a gas flow path having an inclined plate portion 28d. With this inflow, the foreign matter P is removed by the pair of foreign matter removal walls 27, 27 provided in the passage main body 21 of the passage assembly 20, the inclined portion 28c and the inclined plate portion 28d, and the foreign matter P is removed from the bottom wall portion 22 of the passage main body 21. Foreign matter P accumulates on top. Specifically, the wall 27 for removing foreign matter projects vertically from above the bottom wall 22 of the passage main body 21, and the inclined part 28c and the inclined plate part 28d for removing foreign matter are inclined from the lower surface of the lid body 28. The gas G containing foreign matter P such as rust collides with the foreign matter removal wall 27, the inclined portion 28c, and the inclined plate portion 28d. At this time, foreign matter P is deposited on the bottom wall portion 22 around the foreign matter removal wall 27. Further, the gas passage 13 in the passage assembly 20 is a zigzag passage between the foreign matter removal wall 27, the inclined part 28c, and the inclined plate part 28d. However, unlike the conventional case where a filter or the like is installed, the gas passage 13 is not narrowed and is open, so an increase in pressure loss of the gas G can be suppressed.

In this way, when the gas G containing foreign matter P such as rust passes through the gas passage 13 in the flow path assembly 20, the foreign matter P is deposited on the bottom wall portion 22 around the foreign matter removal wall 27. By removing the foreign matter P from the gas G, the amount of foreign matter P flowing into the flow rate measuring section 17 is reduced as much as possible. This reduction makes it possible to suppress the influence of the foreign matter P on flow measurement (such as an increase in measurement error due to the foreign matter P). Further, since it is possible to prevent foreign matter P from adhering to the cutoff valve 18, it is possible to prevent gas from leaking toward the outlet 16 when the cutoff valve 18 shuts off the gas.

In addition, according to each of the above embodiments, two walls and inclined parts for foreign matter removal are provided so as to be located alternately, but three or more walls and inclined parts may be provided. The walls may be provided at an angle. Furthermore, the casing and flow path assembly may be made of metal or synthetic resin.

Further, according to each of the above embodiments, a gap (space) is provided between the bottom wall of the housing and the bottom wall of the passage main body of the flow path assembly. The wall portion may be placed in contact with the bottom wall portion of the casing without any gap.

Furthermore, according to the third embodiment, the locking protrusion as the locking part is formed on the passage main body, and the engaging recess and the engaging hole as the engaging part are formed on the lid body. A locking recess or a locking hole may be formed as a locking portion, and an engaging protrusion may be formed on the lid as an engaging portion.

10, 10', 10A Gas meter 11 Housing 11c Bottom wall (part where gas hits)
15 Inflow port 16 Outflow port 17 Flow rate measurement unit 18 Shutoff valve 20 Channel assembly (channel with wall and slope for removing foreign matter)
21 Passage body 22 Bottom wall 22a Component housing 23 Front wall 24, 24 Both side walls 25 Top opening 26 Rear opening 27 Wall for removing foreign matter 28 Lid 28a Cylindrical portion 28c Inclined portion for removing foreign matter 28j Mating hole (engaging part)
29 Inlet passage structure (inlet)
29a Cylindrical passage (cylindrical passage)
29e Locking protrusion (locking part)
30 Continuous porous member G Gas P Foreign matter

Claims (6)

a casing having a gas inlet and an outlet;
a flow rate measurement unit that measures the flow rate of the gas flowing within the housing;
a shutoff valve that shuts off the flow of gas within the housing;
A gas meter comprising:
comprising a flow path having a wall for removing foreign matter and an inclined part for removing foreign matter contained in the gas flowing from the inlet in the casing ;
The flow path having a wall for removing foreign matter and an inclined portion is a flow path assembly, and the flow path assembly includes:
a passageway body in which a bottom wall, a front wall, and both side walls form a top opening and a rear opening;
a lid body having a cylindrical portion that covers the upper opening of the passage main body;
a cylindrical inlet passage structure that is assembled to the cylindrical portion of the lid and serves as an inlet for the gas;
A plurality of walls for removing foreign matter are provided on the upper surface of the bottom wall portion of the passage main body,
A gas meter, wherein a plurality of inclined parts for removing foreign matter are provided on a lower surface of the lid so as to alternately face the walls for removing foreign matter . 2. The gas meter according to claim 1 , further comprising a continuous porous member for adsorbing foreign matter contained in the gas, between the flow path having the wall for removing foreign matter and an inclined part, and the flow rate measuring section. 3. The gas meter according to claim 1 , wherein the flow path having the wall for removing foreign matter and the inclined portion is installed below from the gas inlet in the housing. 2. The gas meter according to claim 1 , wherein the passage main body has a member accommodating portion that holds a continuous porous member that adsorbs foreign substances contained in the gas . The cylindrical part of the lid has an engaging part,
The gas meter according to any one of claims 1 to 4 , wherein the inlet passage structure includes a locking portion that is engaged and disengaged from the engagement portion. A method for manufacturing a gas meter comprising the flow path assembly according to claim 5 ,
Assembling the cylindrical passage portion of the inlet passage structure by inserting it into the gas inlet of the casing from the inside of the casing;
Next, a continuous porous member is accommodated and held in the member accommodating portion of the passage main body,
Next, after the lid body is assembled and combined with the passage main body, the lid body that has been assembled with the passage main body and combined with the locking portion of the inlet passage structure assembled with the inflow port is then A method for manufacturing a gas meter, in which the flow path assembly is assembled by engaging an engaging portion of a lid.

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