JP2020134510A - Gas meter and manufacturing method of gas meter - Google Patents

Abstract

To provide a gas meter which can remove foreign matters included in gas, suppresses an increase in pressure loss of gas, and maintains a measuring function.SOLUTION: A gas meter 10 includes a housing 11 having an inflow port 15 and an outflow port 16 of gas G, a flow rate measurement section 17 for measuring a flow rate of the gas G flowing in the housing 11, a shut-off valve 18 for shutting off a flow of the gas G in the housing 11, and a channel 20 including at least one wall 27 for foreign matter removal to remove a foreign matter P contained in the gas G and at least one inclined portion 28c in a region 11c to which the gas G flowing from the inflow port 15 in the housing 11 bumps.SELECTED DRAWING: Figure 1

Description

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

As a gas meter of this kind, there is one disclosed in Patent Document 1. This gas meter is provided with a shutoff valve and a flow rate measuring unit in a flow path communicating with a gas inlet and outlet. A filter for removing foreign matter is provided on the upstream side of the shutoff valve and the flow rate measuring unit, and the filter removes foreign matter such as dust in front of the flow rate measuring unit to improve the flow rate measurement accuracy.

Further, Patent Document 2 discloses a gas meter provided with a labyrinth structure and a mesh structure on the upstream side of the flow rate measuring sensor of the gas passage to equalize the positional flow velocity distribution and the temporal pulsation change in the cross section of the gas passage. Has been done.

Japanese Unexamined Patent Publication No. 2004-101303 Japanese Unexamined Patent 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 unit, and a labyrinth structure and a mesh structure are arranged. Therefore, the measurement function may be impaired 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-mentioned problems, and is a gas meter capable of removing foreign substances contained in gas, suppressing an increase in gas pressure loss, and maintaining a measurement function. And to provide a method of manufacturing a gas meter.

The gas meter according to the aspect of the present invention includes a housing having a gas inlet and outlet, a flow rate measuring unit for measuring the flow rate of the gas flowing in the housing, and a cutoff for blocking the gas flow in the housing. A gas meter including a valve, which has at least one wall and at least one inclination for removing foreign matter contained in the gas at a portion of the housing where the gas flowing in from the inflow port abuts. It is provided with a flow path having a portion.

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

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

The flow path having the wall for removing foreign matter and the inclined portion is a flow path assembly installed below the gas inflow port in the housing, and the flow path assembly is a bottom wall portion and a front wall. A passage body that forms an upper surface opening and a rear surface opening with the portion and both side wall portions, a lid body having a tubular portion that covers the upper surface opening of the passage body, and the tubular portion of the lid body are assembled to the above. It has a tubular inlet passage structure that serves as a gas inflow port, a plurality of walls for removing foreign matter are provided on the upper surface of the bottom wall portion of the passage body, and the lower surface of the lid is for removing foreign matter. It is preferable that a plurality of inclined portions of the above are provided so as to alternately face the wall for removing foreign matter.

The passage body preferably has a member accommodating portion for holding the continuous porous member.

It is preferable that the tubular portion of the lid body has an engaging portion, and the inlet passage component has a locking portion that is engaged with and disengaged from the engaging portion.

A method for manufacturing a gas meter according to another aspect of the present invention is a method for manufacturing a gas meter provided with the flow path assembly, wherein a tubular passage portion of the inlet passage structure is used as a gas inflow port of the housing. It was inserted from the inside of the housing and assembled, then the continuous porous member was accommodated and held in the member accommodating portion of the passage body, and then the lid was assembled and united in the passage body. Later, by engaging the engaging portion of the lid body assembled and united with the passage body with the locking portion of the inlet passage configuration assembled to the inflow port, the flow path is described. This is a manufacturing method in which an assembly is assembled.

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

It is schematic sectional drawing which shows an example of the gas meter which concerns on 1st Embodiment of this invention. (A) is a perspective view of the flow path assembly used in the gas meter, and (b) is a plan view of the flow path assembly. (A) is a side view of the flow path assembly, (b) is a rear view of the flow path assembly, and (c) is a cross-sectional view taken along line XX in the figure (b). (A) is a perspective view of the passage body of the flow path assembly, (b) is a plan view of the passage body, (c) is a side view of the passage body, and (d) is a rear view of the passage body. (A) is a perspective view of the lid of the flow path 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 entrance passage structure of the flow path assembly, (b) is a plan view of the entrance passage structure, (c) is a side view of the entrance passage structure, and (d) is a side view of the entrance passage structure. It is a rear view. It is schematic cross-sectional view which shows an example of the gas meter which concerns on 2nd Embodiment of this invention. It is schematic sectional drawing which shows an example of the gas meter which concerns on 3rd Embodiment of this invention. It is an exploded perspective view of the gas meter of the said 3rd Embodiment. (A) is a plan view of the passage body of the flow path assembly used in the gas meter of the third embodiment, (b) is a sectional view taken along line BB in FIG. (A), and (c) is FIG. It is sectional drawing along the middle CC line. (A) is a side view of the passage body of the flow path 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 FIG. A cross-sectional view taken along the line −D, (e) is a cross-sectional view taken along the line EE in FIG. (A) is a plan view of the lid of the flow path assembly of the third embodiment, (b) is a 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 cross-sectional view taken along the line CC in FIG. (A) is a plan view of the entrance passage structure of the flow path assembly, (b) is a side view of the entrance passage structure, (c) is a cross-sectional view taken along the line CC in FIG. Is a cross-sectional view taken along the line DD in FIG. (A) is a rear view of the entrance passage structure of the flow path assembly of the third embodiment, (b) is a bottom view of the entrance passage structure, and (c) is an enlarged view of FIG. (B) C portion. (A) is a schematic cross-sectional view showing a state in which the inlet passage component is being assembled to the gas inflow port of the housing of the gas meter of the third embodiment, and (b) is the assembly of the lid body to the inlet passage component. It is a schematic cross-sectional view which shows the state which assembled and united the passage main body.

Hereinafter, the gas meter according to the embodiment of the present invention will be described in detail with reference to the drawings.

1 is a schematic cross-sectional view showing an example of a gas meter according to the first embodiment of the present invention, FIG. 2A is a perspective view of a flow path assembly used in the gas meter, and FIG. 2B is a plan view of the flow path assembly. 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), and FIG. (A) is a perspective view of the passage body of the flow path assembly, FIG. 4 (b) is a plan view of the passage body, FIG. 4 (c) is a side view of the passage body, and FIG. 4 (d) is a rear view of the passage body. 5 (a) is a perspective view of the lid of the flow path 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 the back surface of the lid. 6 (a) is a perspective view of the entrance passage structure of the flow path assembly, FIG. 6 (b) is a plan view of the entrance passage structure, and FIG. 6 (c) is a side view of the entrance passage structure. (D) is a rear view of the entrance 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 unit 17 for measuring the flow rate of gas G flowing in the housing 11, and a housing. A shutoff valve 18 for shutting off the flow of the gas G in the 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 inflow port 15 in the housing 11 abuts and the inflow port 15, and removes the foreign matter P contained in the gas G. A flow path assembly (flow path) 20 having a wall 27 for removal and an inclined portion 28c is provided.

The housing 11 has a bottomed surface (bottom wall portion 11c) having a side opening portion 11b, and has a rectangular tubular shape assembled so as to close the square tubular main body portion 11a and the side opening portion 11b of the main body portion 11a. It has a lid (not shown). Then, a cylindrical inflow port 15 and a cylindrical outlet 16 are projected from the upper wall portion 11d of the housing 11, respectively. Further, a side L-shaped flow path assembly 20 is detachably assembled below the inflow port 15 in the housing 11. Further, a flow rate measuring unit 17 is assembled via a shutoff valve 18 on the outlet 16 side of the upper wall portion 11d of the housing 11.

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

As shown in FIGS. 2 (a) and 2 (b) and 3 (a), (b) and (c), the flow path assembly 20 as a flow path having a wall 27 for removing foreign matter and an inclined portion 28c , The upper wall portion 11d of the housing 11 is arranged from the gas G inflow port 15 side to the bottom wall portion 11c side of the main body portion 11a. Then, as shown in FIGS. 2 (a) and 2 (b) and 3 (a), (b) and (c), the flow path assembly 20 includes the passage body 21, the lid 28, and the entrance passage component. It has 29 and.

As shown in FIGS. 4 (a), (b), (c), and (d), the passage body 21 has a rectangular plate-shaped bottom wall portion 22, a curved surface-shaped front wall portion 23, and both side wall portions 24. 24, and an upper surface opening 25 and a rear surface opening 26 are formed between the respective portions. A pair of walls 27 for removing foreign matter are provided on the upper surface of the bottom wall portion 22 of the passage body 21 at a predetermined distance. The pair of walls 27, 27 for removing foreign matter are integrally formed in a rectangular plate shape between the side wall portions 24, 24 so as to stand vertically from the upper surface of the bottom wall portion 22. Further, a triangular notch 24a is formed at the center of the upper surface opening 25 on each of the inner surfaces of the side wall portions 24 and 24 and on the rear surface opening 26 side. Further, as shown in FIG. 4C, the wall 27 for removing foreign matter and the triangular notch 24a are located alternately (mismatched).

As shown in FIGS. 5 (a), 5 (b), (c), and (d), the lid 28 has a rectangular shape that covers the curved front wall 23 side of the upper surface opening 25 of the passage body 21. It has a tubular portion 28a and a rectangular plate portion 28b that covers the rear side of the upper surface opening 25 from the center. On the lower surface of the rectangular plate portion 28b, a pair of triangular convex portions 28c and 28c are integrally projected so as to fit between the pair of notched portions 24a and 24a in the triangular shape of the side wall portions 24 and 24 of the passage body 21. Has been done. As shown in FIG. 3C, the triangular convex inclined portion 28c of the lid 28 is arranged between the pair of foreign matter removing walls 27 and 27 of the passage body 21. A zigzag passage of gas G is formed by a pair of inclined portions 28c and 28c of the lid 28 and a pair of walls 27 and 27 for removing foreign matter of the passage main body 21. As a result, the foreign matter P contained in the gas G hits the wall 27 and the inclined portion 28c for removing the foreign matter, and is collected and removed on the bottom wall portion 22 of the passage body 21.

As shown in FIGS. 6 (a), 6 (b), (c), and (d), the inlet passage structure 29 is an inflow port 15 which is an inlet passage of the gas G. That is, the inlet passage component 29 is integrally formed with the cylindrical passage portion 29a above the inflow port 15 of the gas G and the passage portion 29a via the upper surface wall portion 29b, and the tubular portion 28a of the lid 28. It has a square tubular passage portion 29c which is assembled to the lower side of the inflow port 15 of the gas G.

As shown in FIG. 1, a gas supply pipe (meter connection pipe) 12 is connected to the gas G inflow port 15 (29) of the housing 11 of the gas meter 10, and the gas G outflow port of the housing 11 is connected. A gas discharge pipe 14 is connected to 16. Then, the pair of walls 27, 27 for removing foreign matter and the pair of inclined portions 28c, 28c of the flow path assembly 20 remove the foreign matter P such as rust of the gas supply pipe 12 contained in the gas G. Further, as shown by the dotted line in the middle of FIG. 1, the gas passage 13 in the housing 11 passes through the flow path assembly 20 from the inflow port 15 of the gas G and bends below the shutoff valve 18 and the flow rate measuring unit 17. It is a flow path that passes from the flow rate measuring unit 17 through the shutoff valve 18 and the outflow port 16.

According to the gas meter 10 of the first embodiment, as shown in FIG. 1, the gas G containing foreign matter P such as rust on the gas supply pipe 12 forms a wall 27 and an inclined portion 28c for removing foreign matter from the inflow port 15. It flows into the flow path assembly 20 which is a gas flow path provided. With this inflow, the foreign matter P is removed by the pair of foreign matter removing walls 27, 27 and the pair of inclined portions 28c, 28c provided on the passage main body 21 of the passage assembly 20, and the foreign matter P is removed on the bottom wall portion 22 of the passage main body 21. Foreign matter P collects in. More specifically, the wall 27 for removing foreign matter vertically projects from above the bottom wall portion 22 of the passage body 21, and the inclined portion 28c for removing foreign matter projects inclined from the lower surface of the lid 28. The gas G containing the foreign matter P such as rust abuts on the wall 27 for removing the foreign matter and the inclined portion 28c. At this time, the foreign matter P is deposited on the bottom wall portion 22 around the wall 27 for removing the foreign matter. Further, the gas passage 13 in the flow path assembly 20 is a zigzag flow path between the wall 27 for removing foreign matter and the inclined portion 28c. However, unlike the case where a filter or the like is installed as in the conventional case, the gas passage 13 is not narrowed and is open, so that an increase in the pressure loss of the gas G can be suppressed.

As described above, when the gas G containing the 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 wall 27 for removing the foreign matter. By removing the foreign matter P in the gas G, the amount of the foreign matter P flowing into the flow rate measuring unit 17 is reduced as much as possible. Due to this reduction, the influence of the foreign matter P on the flow rate measurement (increased measurement error due to the foreign matter P, etc.) can be suppressed. Further, since it is possible to prevent the foreign matter P from adhering to the shutoff valve 18, it is possible to prevent the occurrence of gas leakage to the outflow port 16 side when the gas is shut off by the shutoff valve 18.

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

In the gas meter 10'of the second embodiment, open cells that adsorb foreign matter P such as rust on the gas supply pipe 12 contained in the gas G into the gas passage 13 between the flow path assembly 20 and the flow rate measuring unit 17. It differs from the first embodiment in that it has a continuously porous member 30 such as a sponge. Since the other configurations are the same as those in the first embodiment, the same components are designated by the same reference numerals and detailed description thereof will be omitted.

In the gas meter 10'of the second embodiment, as in the first embodiment, when the gas G containing the 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. Foreign matter P in the gas G is removed by accumulating on the bottom wall portion 22 around the wall 27 for removal. By this removal, the amount of the foreign matter P flowing into the flow rate measuring unit 17 can be reduced as much as possible, and the influence of the foreign matter P on the flow rate measurement (increased measurement error due to the foreign matter P, etc.) can be suppressed. ..

Further, by arranging the continuous porous member 30 for adsorbing the foreign matter P on the downstream side of the gas passage 13 of the flow path assembly 20, the amount of the 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 the 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 the flow path assembly used for the gas meter, FIG. 10 (b) is a cross-sectional view taken along the line BB in FIG. 10 (a), and FIG. 10 (c) is FIG. 10 (c). a) It is sectional drawing which follows the middle CC line. 11 (a) is a side view of the passage body of the flow path assembly, FIG. 11 (b) is a bottom view of the passage body, FIG. 11 (c) is a rear view of the passage body, and FIG. 11 (d) is FIG. 11 (a). ) A cross-sectional view taken along the line ED in FIG. 11 (e) is a cross-sectional view taken along the line EE in FIG. 11 (a). 12 (a) is a plan view of the lid of the flow path assembly, FIG. 12 (b) is a cross-sectional view taken along the 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 cross-sectional view taken along the line CC in FIG. 13 (a). 14 (a) is a plan view of the entrance passage structure of the flow path assembly, FIG. 14 (b) is a side view of the entrance passage structure, and FIG. 14 (c) is along the line CC in FIG. 14 (b). A cross-sectional view, FIG. 14 (d) is a cross-sectional view taken along the line DD in FIG. 14 (a). 15 (a) is a rear view of the entrance passage structure of the flow path assembly, FIG. 15 (b) is a bottom view of the entrance passage structure, and FIG. 15 (c) is an enlarged view of the 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 inflow port 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 which shows the state which the main body was assembled and united.

In the gas meter 10A of the third embodiment, the flow path assembly 20 accommodates and holds a continuous porous member 30 such as an open cell sponge for adsorbing foreign matter P such as rust on the gas supply pipe 12 contained in the gas G. It is different from the first embodiment in that the member accommodating portion 22a is provided. Since the other configurations are the same as those in the first embodiment, the same components will be described with the same reference numerals.

As shown in FIGS. 8 and 9, the gas meter 10A of the third embodiment measures the flow rate of the gas G flowing through the housing 11 and the metal housing 11 having the gas G inlet 15 and the gas outlet 16. A flow rate measuring unit 17 for measuring and a shutoff valve 18 for shutting off the flow of gas G in the housing 11 are provided. Further, the gas meter 10A is arranged between the portion where the gas G flowing in from the inflow port 15 in the housing 11 abuts and the inflow port 15, and has a wall 27 for removing foreign matter P contained in the gas G. A flow path assembly 20 having an inclined portion 28c and an inclined plate portion 28d is further provided.

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

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

The flow rate measuring unit 17 measures the flow rate of the gas G flowing through the gas passage 13 from the inflow port 15 to the outflow port 16 of the gas G by, for example, an ultrasonic sensor (not shown). Further, the shutoff valve 18 shuts off the gas G flowing to the outlet 16 side by pressing a valve rubber body (not shown) against a valve seat (not shown). As shown by the dotted line in the middle of FIG. 8, the gas passage 13 in the housing 11 passes through the flow path assembly 20 from the inflow port 15 of the gas G, diffuses into the entire inside of the housing 11, and then measures the flow rate. It is a flow path that flows into the section 17 and passes through the flow rate measuring section 17 through the shutoff valve 18 and the outflow port 16.

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

Further, as shown in FIG. 8, the flow path assembly 20 as a flow path having the wall 27 for removing foreign matter, the inclined portion 28c, and the inclined plate portion 28d is the flow of the gas G of the upper wall portion 11d of the housing 11. It is arranged from the entrance 15 side to the bottom wall portion 11c side of the main body portion 11a. Then, as shown in FIGS. 8 and 9, the synthetic resin flow path assembly 20 assembled inside from the side opening 11b of the housing 11 includes a passage body 21, a lid 28, and an entrance passage component. 29 and.

As shown in FIGS. 9, 10 (a) to 10 (c) and 11 (a) to 11 (e), the passage body 21 has a substantially rectangular plate-shaped bottom wall portion 22 and a curved surface-shaped front wall portion 23. And both side wall portions 24, 24, and an upper surface opening 25 and a rear surface opening 26 are formed between the respective portions. A pair of walls 27 for removing foreign matter are provided on the upper surface of the bottom wall portion 22 of the passage body 21 at a predetermined distance. Of the pair of walls 27, 27 for removing foreign matter, the upstream wall 27 has an inclined piece portion 27a and an upright piece portion 27b, and both side wall portions 24, 24 so as to stand up from the upper surface of the bottom wall portion 22. It is integrally formed between them in an inverted V shape in cross section. Further, of the pair of walls 27, 27 for removing foreign matter, the wall 27 on the downstream side is integrally formed in a rectangular plate shape between the side wall portions 24, 24 so as to stand vertically from the upper surface of the bottom wall portion 22. There is. Further, a pair of triangular notches 24a are formed at the center of the upper surface opening 25 on the inner surfaces of the side wall portions 24 and 24 and on the rear surface opening 26 side. Of the pair of notches 24a, 24a, the notch 24a on the upstream side is notched in a triangular concave shape. Further, the notch portion 24a on the downstream side of the pair of notch portions 24a, 24a is completely cut out in a triangular shape. Further, as shown in FIG. 10B, the wall 27 for removing foreign matter and the triangular notch 24a are located alternately (inconsistently).

Further, as shown in FIGS. 9, 10 (a) and 10 (b), the bottom wall portion 22 of the passage main body 21 has a shutoff valve 18 as compared with the bottom wall portion 22 of the passage main body 21 of the first embodiment. It extends downward, and this extension portion serves as a member accommodating portion 22a for accommodating and holding the continuous porous member 30. That is, the member accommodating portion 22a is provided in a square frame shape from the notch portion 24a on the downstream side to the rear opening portion 26. A pair of front and rear locking projections 24b, 24b are integrally projected on the side wall portions 24, 24 forming the frame portion of the member accommodating portion 22a so as to be elastically deformable. Further, each pair of locking projections 24c and 24c are elastically deformably integrally formed on the front and rear of the pair of foreign matter removing walls 27 and 27 on both side wall portions 24 and 24. Each of these locking projections 24b and 24c is for locking and fixing when assembling the lid 28, which will be described later.

As shown in FIGS. 9, 12 (a) to 12 (c) and 13 (a) to 13 (c), the lid 28 is the curved front wall portion 23 side of the upper surface opening 25 of the passage body 21. It has a square tubular portion 28a that covers the above surface, and a rectangular plate portion 28b that covers the central side of the upper surface opening 25. Further, the lid 28 includes an inclined plate portion 28d that covers the rear side of the upper surface opening 25 of the passage body 21 from the center, and a widening extension plate portion 28e that covers the rear end side of the upper surface opening 25. It is provided so as to be connected to the rectangular plate portion 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 of the side wall portions 24 and 24 of the passage body 21. A triangular convex inclined portion 28c that fits into the portion 24a is integrally projected. As a result, the triangular convex inclined portion 28c of the lid 28 is arranged between the pair of foreign matter removing walls 27, 27 of the passage body 21. Further, the lower surface of the inclined plate portion 28d of the lid body 28 hits the notch portions 24a on the downstream side of the side wall portions 24, 24 of the passage main body 21 and is inclined downward to project. Then, as shown in FIG. 8, a zigzag passage of gas G is formed by the inclined portion 28c and the inclined plate portion 28d of the lid 28 and the pair of walls 27 and 27 for removing foreign matter of the passage main body 21. As a result, the foreign matter P contained in the gas G hits the wall 27 for removing the foreign matter, the inclined portion 28c, and the inclined plate portion 28d, and is collected and removed on the bottom wall portion 22 of the passage body 21.

As shown in FIGS. 9 and 12 (a), the widening extension plate portion 28e of the lid 28 covers the upper surface opening 25 above the member accommodating portion 22a of the bottom wall portion 22 of the passage body 21. .. A pair of engaging recesses 28f and 28f that engage with each pair of locking projections 24b and 24b on both sides of the member accommodating portion 22a of the passage body 21 are formed on the front and rear sides of the widening extension plate portion 28e. Has been done. Further, the front and rear sides of the rectangular plate portion 28b of the lid 28 are engaged with a pair of locking projections (locking portions) 24c and 24c on both sides of the center of the side wall portions 24 and 24 of the passage body 21. A pair of engaging holes 28g and 28g are formed.

Further, as shown in FIGS. 9 and 13 (a) to 13 (c), a rectangular notch 28h is provided on one side wall of the lid 28 located on the opposite side of the cover 19 of the square tubular portion 28a. It is formed. Further, a pair of slide grooves 28i and 28i are formed in a concave shape on the front and rear wall portions of the square tubular tubular portion 28a so as to be continuous with both ends of the notch portion 28h. Further, a pair of engaging holes (engaging portions) 28j connected to the pair of slide grooves 28i and 28i are formed on the other side wall of the lid 28 located on the cover 19 side of the square tubular portion 28a.

As shown in FIGS. 8, 9, 14 (a) to 14 (d), and 15 (a) to 15 (c), the inlet passage structure 29 communicates with the inflow port 15 which is the inlet passage of the gas G. It is a thing. That is, the inlet passage component 29 has a cylindrical passage portion (cylindrical passage portion) 29a that is inserted into the cylindrical inflow port 15 of the gas G. Further, the entrance passage component 29 is integrally formed with the cylindrical passage portion 29a via the upper surface wall portion 29b, and further has a square tubular passage portion 29c to be assembled to the square tubular portion 28a of the lid 28. are doing.

As shown in FIGS. 9, 14 (a) to 14 (d) and FIGS. 15 (a) to 15 (c), the square tubular passage portion 29c of the entrance passage component 29 is a square cylinder of the lid 28. It is formed in a size that fits into the portion 28a. Then, on the lower end side of the front and rear wall portions of the square tubular passage portion 29c, a pair of rail portions 29d that slide the pair of slide grooves 28i and 28i of the square tubular portion 28a of the lid 28 are integrally projected. There is. At the tips of the pair of rail portions 29d and 29d, a locking projection (locking portion) 29e that is locked to each engaging hole 28j of the square tubular portion 28a of the lid 28 is elastically deformably integrated. It is overhanging. When each of the locking projections 29e is locked in each engagement hole 28j, the locking piece portion 29f of the square tubular passage portion 29c is fitted into the notch portion 28h of the square tubular portion 28a of the lid 28. It has become like.

Next, the procedure for assembling the flow path assembly 20 will be described with reference to FIGS. 9 and 16 (a) and 16 (b).

As shown in FIGS. 9 and 16A, first, the cylindrical passage portion 29a of the inlet passage configuration 29 is inserted into the cylindrical inflow port 15 of the housing 11 from the inside of the housing 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 body 21.

Next, in each pair of locking projections 24b, 24b and each pair of locking projections 24c, 24c of the passage body 21, each pair of engaging recesses 28f, 28f and each pair of engaging holes 28g of the lid 28, The lid 28 is assembled and united with the passage body 21 by engaging 28 g. After this combination, a pair of locking projections 29e and 29e of the inlet passage component 29 assembled to the cylindrical inflow port 15 and a pair of lids 28 assembled to the passage body 21 and combined. By engaging the holes 28j and 28j, the assembly of the flow path assembly 20 is completed as shown in FIG. 16B.

When assembling the flow path assembly 20, the pair of slide grooves 28i and 28i of the lid 28 are inserted into the pair of rail portions 29d and 29d of the inlet passage configuration 29, and the notch 28h of the lid 28 constitutes the entrance passage. The lid 28 is pushed into the housing 11 until it hits 29f of the body 29. By pushing the lid body 28 by sliding, the entrance passage structure 29 and the lid body 28 are positioned without a gap, and the engaging hole 28j of the lid body 28 is smoothly engaged with the locking projection 29e of the entrance passage structure 29. Can be made to. Further, the flow path assembly 20 can be easily and surely assembled without the operator having to put his / her hand in the narrow housing 11.

Further, at the stage of assembling the flow path assembly 20, the continuous porous member 30 can be accommodated and held in the frame-shaped member accommodating portion 22a of the passage body 21, so that a component for fixing the continuous porous member 30 becomes unnecessary. By that amount, the number of parts can be reduced and the cost can be reduced.

According to the gas meter 10A of the third embodiment, as shown in FIG. 8, the gas G containing foreign matter P such as rust on the gas supply pipe 12 enters the wall 27 and the inclined portion 28c for removing foreign matter from the inflow port 15. It flows into the flow path assembly 20 which is a gas flow path having the inclined plate portion 28d. With this inflow, the foreign matter P is removed by the pair of foreign matter removing walls 27, 27, the inclined portion 28c, and the inclined plate portion 28d provided on the passage main body 21 of the passage assembly 20, and the bottom wall portion 22 of the passage main body 21. Foreign matter P collects on the top. More specifically, the wall 27 for removing foreign matter projects vertically from above the bottom wall portion 22 of the passage body 21, and the inclined portion 28c and the inclined plate portion 28d for removing foreign matter are inclined from the lower surface of the lid 28. The gas G containing foreign matter P such as rust abuts on the wall 27 for removing foreign matter, the inclined portion 28c, and the inclined plate portion 28d. At this time, the foreign matter P is deposited on the bottom wall portion 22 around the wall 27 for removing the foreign matter. Further, the gas passage 13 in the flow path assembly 20 is a zigzag flow path between the wall 27 for removing foreign matter, the inclined portion 28c, and the inclined plate portion 28d. However, unlike the case where a filter or the like is installed as in the conventional case, the gas passage 13 is not narrowed and is open, so that an increase in the pressure loss of the gas G can be suppressed.

As described above, when the gas G containing the 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 wall 27 for removing the foreign matter. By removing the foreign matter P in the gas G, the amount of the foreign matter P flowing into the flow rate measuring unit 17 is reduced as much as possible. Due to this reduction, the influence of the foreign matter P on the flow rate measurement (increased measurement error due to the foreign matter P, etc.) can be suppressed. Further, since it is possible to prevent the foreign matter P from adhering to the shutoff valve 18, it is possible to prevent the occurrence of gas leakage to the outflow port 16 side when the gas is shut off by the shutoff valve 18.

According to each of the above-described embodiments, two walls and two inclined portions are provided so as to be staggered, but three or more may be provided, and for foreign matter removal so that the gas inflow side has an acute angle. The wall may be provided at an acute angle. Further, the housing and the flow path assembly may be made of metal or synthetic resin.

Further, according to each of the above-described embodiments, a gap (space) is provided between the bottom wall portion of the housing and the bottom wall portion of the passage body of the flow path assembly, but the bottom of the passage body of the flow path assembly. The wall portion may be arranged so as to be in contact with the bottom wall portion of the housing without a gap.

Further, according to the third embodiment, a locking projection as a locking portion is formed in the passage main body, and an engaging recess and an engaging hole as an engaging portion are formed in the lid body, but the passage main body is engaged. A locking recess or a locking hole may be formed as a stopping portion, and an engaging protrusion as an engaging portion may be formed on the lid.

10, 10', 10A gas meter 11 Housing 11c Bottom wall (part where gas hits)
15 Inflow port 16 Outlet 17 Flow rate measuring unit 18 Shutoff valve 20 Flow path assembly (flow path with a wall and inclined part for removing foreign matter)
21 Passage body 22 Bottom wall 22a Member housing 23 Front wall 24, 24 Both side walls 25 Top opening 26 Rear opening 27 Wall for foreign matter removal 28 Lid 28a Cylinder 28c Inclined part for foreign matter removal 28j Joint hole (engagement part)
29 Entrance passage structure (inflow)
29a Cylindrical passage (cylindrical passage)
29e Locking protrusion (locking part)
30 Continuous porous member G gas P foreign matter

Claims (7)

A housing with gas inlets and outlets,
A flow rate measuring unit that measures the flow rate of the gas flowing in the housing,
A shutoff valve that shuts off the flow of gas in the housing,
It is a gas meter equipped with
A gas meter having a flow path having at least one wall for removing foreign matter and at least one inclined portion for removing foreign matter contained in the gas at a portion of the housing where the gas flowing in from the inflow port abuts. The gas meter according to claim 1, further comprising a wall for removing foreign matter and a flow path provided with a plurality of inclined portions. The gas meter according to claim 1 or 2, further comprising a continuously porous member for adsorbing foreign substances contained in the gas between the flow path having a wall for removing foreign substances and an inclined portion and the flow rate measuring unit. The flow path having the wall for removing foreign matter and the inclined portion is a flow path assembly installed below the gas inflow port in the housing.
The flow path assembly
A passage body that forms an upper surface opening and a rear surface opening with a bottom wall portion, a front wall portion, and both side wall portions.
A lid having a tubular portion that covers the upper surface opening of the passage body, and
It has a tubular inlet passage structure that is assembled to the tubular 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 body.
The gas meter according to any one of claims 1 to 3, wherein a plurality of inclined portions for removing foreign matter are provided on the lower surface of the lid so as to face the wall for removing foreign matter in a staggered manner. The gas meter according to claim 4, wherein the passage body has a member accommodating portion for holding a continuously porous member. The tubular portion of the lid has an engaging portion and has an engaging portion.
The gas meter according to claim 4, wherein the inlet passage component has a locking portion that is engaged with and disengaged from the engaging portion. The method for manufacturing a gas meter provided with the flow path assembly according to claim 4.
The tubular passage portion of the inlet passage structure is inserted into the gas inflow port of the housing from the inside of the housing and assembled.
Next, the continuous porous member is accommodated and held in the member accommodating portion of the passage body.
Next, after the lid body is assembled and united with the passage body, the above is assembled and united with the passage body at the locking portion of the inlet passage component assembled with the inflow port. A method for manufacturing a gas meter to which the flow path assembly is assembled by engaging an engaging portion of a lid body.

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