JP6991881B2 - Gas meter - Google Patents

Description

The present invention relates to a gas meter having a built-in pressure sensor for detecting a gas pressure abnormality.

The pressure sensor of this type of gas meter is generally structured to detect an abnormality in gas pressure by comparing gas pressure with atmospheric pressure. Further, as a conventional gas meter, there is known that the accommodating portion of the pressure sensor is provided with a vent hole for taking in atmospheric pressure on the lower surface (see, for example, Patent Document 1).

Jikkenhei 4-43223 (pages 10 to 11, 13 to 15)

However, in the above-mentioned conventional gas meter, rainwater traveling on the outer surface may wrap around to the lower surface and enter the ventilation holes.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas meter capable of suppressing the intrusion of rainwater into the ventilation holes.

The invention of claim 1 made to achieve the above object measures the flow rate of gas passing through the meter case, and also uses a pressure sensor housed in an accessory room adjacent to the gas flow path to enter the flow path. In a gas meter that detects abnormalities in gas pressure in comparison with atmospheric pressure, a groove end opening that is formed on the lower surface of the meter case and extends horizontally, and its end is opened at a lower position on the outer surface of the meter case. A lower surface groove that has become It is formed in a stepped shape at the lower end of the extending band-shaped area, is inclined with respect to the width direction of the band-shaped area, receives rainwater flowing down the band-shaped area, and guides it to one side of the band-shaped area. An inclined guide surface, a vertical blocking surface that rises upward from the lower end of the laterally inclined guide surface and blocks rainwater guided by the laterally inclined guide surface, and the laterally inclined guide surface and the vertical dam surface. It is a gas meter located at one end of the intersecting portion and having a rainwater discharging portion for discharging rainwater from above on one side edge portion of the groove end opening.

The first aspect of the present invention is the first aspect of the present invention, which is formed by being recessed in the band-shaped region, has the laterally inclined guide surface at the inner lower portion thereof, and has a recess having the vertical damming surface on one inner side portion thereof. It is a gas meter.

The invention of claim 3 has a rib shape protruding from the lower surface of the meter case, and one surface of the front and back thereof constitutes an inner surface of the lower surface groove on the one side edge side of the groove end opening. The gas meter according to claim 1 or 2, further comprising a lower surface rib.

The invention according to claim 4 is the gas meter according to claim 3, wherein the other surface of the front and back surfaces of the lower surface rib is extended from the lower end portion of the laterally inclined guide surface to the upper side.

According to the fifth aspect of the present invention, the accessory room is provided with a first accessory room for accommodating the pressure sensor and the first accessory room next to each other across a partition wall, and the ventilation hole penetrates the bottom portion. A second accessory room is provided, and a communication hole communicating between the first and second accessory rooms penetrates the upper end portion of the partition wall according to any one of claims 1 to 4. The gas meter according to the claim.

According to a sixth aspect of the present invention, the second ancillary chamber has a lid that opens horizontally to close the opening, and the lower surface groove is formed on the lower opening edge of the second ancillary chamber. The gas meter according to claim 5, further comprising a groove cover that extends along and is bent at a right angle from the lower end of the lid to cover the lower surface groove from below.

In the gas meter of claim 1, a ventilation hole for taking in atmospheric pressure in the pressure sensor is opened on the ceiling surface of the lower surface groove provided on the lower surface of the meter case. Here, on the lower end of the strip-shaped region extending upward from the groove end opening of the lower surface groove on the outer surface of the meter case, a laterally inclined guide surface inclined in the width direction of the strip-shaped region is formed in a stepped manner and laterally inclined. A vertical weir stop surface rises from the lower end of the guide surface. As a result, the rainwater flowing down the belt-shaped region is guided to one side of the belt-shaped region by the laterally inclined guide surface, and then blocked by the vertical weir surface, and the laterally inclined guide surface and the vertical weir surface are used. It is discharged from the rainwater discharge portion at one end of the intersection to one side edge of the groove end opening, and further flows down along the ridgeline of the one side edge and falls below the lower surface groove. That is, in the present invention, the rainwater flowing down the strip-shaped region can be transmitted to the ceiling surface of the lower surface groove if the laterally inclined guide surface is not provided. It can be guided to the portion and the one side edge thereof can be used as a rain gutter to guide it below the lower surface groove. As a result, it is possible to regulate the transmission of rainwater to the ceiling surface of the lower surface groove, and the infiltration of rainwater into the ventilation holes is suppressed.

The laterally inclined guide surface and the vertical damming surface may be provided as the upper surface or the side surface of the protrusion on the outer surface of the meter case, or a recess formed in the outer surface of the meter case as in the configuration of claim 2. It may be provided as the inner surface of the. According to the second aspect, it is not necessary to provide a protrusion for providing the laterally inclined guide surface and the vertical damming surface on the outer surface of the meter case, and the foreign matter can be prevented from being caught.

The lower surface groove may be formed in a state of being depressed in the lower surface of the meter case, but as in the gas meter of claim 3, the lower surface rib protruding from the lower surface of the meter case constitutes one inner surface of the lower surface groove. If one side edge of the groove end opening is composed of the side edge of the lower surface rib, the two ridges on the front and back of the side edge of the lower surface rib can be used to stably verticalize rainwater. It can be guided downwards. Further, as in the invention of claim 4, if the other surface of the front and back surfaces of the lower surface rib is extended from the lower end portion of the laterally inclined guide surface to the upper side, one of the above two ridge lines can be used as the rainwater discharge portion. It is possible to approach to, and the transmission of rainwater from the rainwater discharge part to one side edge of the groove end opening is stable.

In the gas meter of claim 5, the communication hole penetrates the upper part of the partition wall between the adjacent first and second accessory rooms, and the ventilation hole penetrates the bottom of the second accessory room. Even if water enters the second accessory room through the pores, it is possible to prevent water from entering the first accessory room that houses the pressure sensor.

In the gas meter of claim 5, the lower surface groove is covered from below by a groove cover bent at a right angle from the lower end of the lid that closes the opening of the second accessory room. Infiltration is suppressed.

Perspective view of a gas meter according to an embodiment of the present invention An exploded perspective view of the gas meter Regular cross section of gas meter Perspective view with the front cover and receiving palate of the gas meter removed Perspective view of the gas meter from the rear Perspective view of the gas meter from the rear Perspective view of the gas meter from the rear Rear view of a part of the gas meter Perspective view of a conventional gas meter from the rear

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 9. The gas meter 10 of the present embodiment shown in FIG. 1 has a shutoff valve 20 (see FIG. 2), a measuring tube 50 (see FIG. 3), and a rectifier 70 (see FIG. 3) in a meter case 11 connected in the middle of a gas pipe 99. (See Fig. 3), etc. are accommodated and provided.

The meter case 11 is, for example, a cast aluminum part, and has a substantially rectangular parallelepiped duct portion 12 extending in the lateral direction. Hereinafter, the first horizontal direction in which the duct portion 12 extends is referred to as "horizontal direction H1", and the second horizontal direction orthogonal to it is referred to as "front-back direction H2". Further, of the front-rear direction H2, the side having the front flange 16 described later is referred to as "front side" or the like, and the opposite side thereof is referred to as "rear side" or the like.

As shown in FIG. 2, a hood portion 13 is provided on the left side of the duct portion 12 when viewed from the front, and the inside of the hood portion 13 is the second accessory room 10K according to the present invention. Further, chamfered inclined walls 35 are provided at the four corners of the hood portion 13. Further, a quadrangular hood portion flange 36 projects in all directions from the tip end portion of the hood portion 13. The hood portion flange 36 is formed with an annular O-ring groove 37 slightly larger than the opening of the hood portion 13, and screw holes are formed at four corners outside the O-ring groove 37. Then, with the O-ring (not shown) accommodated in the O-ring groove 37, the plate-shaped lid 15 is addressed to the hood portion flange 36 and screwed. As a result, the opening 13K of the second accessory room 10K is sealed.

The hood portion 13 and the duct portion 12 are partitioned by a valve mounting wall 14. Further, the inside of the duct portion 12 is arranged in the same order by the first to third partition walls 25, 26, 27 which are arranged in order from the valve mounting wall 14 side in the lateral direction H1, the blocking room 30, the inflow room 31, and the middle. It is divided into a room 32 and an outflow room 33.

A pair of pipe connection portions 23, 24 are projected from the left and right ends of the upper surface of the duct portion 12 to communicate with the cutoff room 30 and the outflow room 33. Then, the pipe 99 (see FIG. 2) on the fuel gas supply source side is connected to one of the pipe connection portions 23 communicating with the cutoff room 30, while the fuel gas is connected to the other pipe connection portion 24 communicating with the outflow chamber 33. The user-side piping 99 is connected.

As shown in FIG. 3, a circular through hole 14A is formed in the valve mounting wall 14, and a circular through hole 25A slightly smaller than the through hole 14A is formed in the first partition wall 25. Then, as shown in FIG. 2, the flange 20F of the shutoff valve 20 is addressed to the opening edge of the valve mounting wall 14 on the hood portion 13 side and screwed, and the valve body 21 of the shutoff valve 20 is housed in the shutoff chamber 30. ing. Then, as shown in FIG. 3, normally, the valve body 21 is separated from the through hole 25A, and when an abnormality occurs in the flow rate of fuel gas or the like, the valve body 21 closes the through hole 25A.

As shown in FIG. 4, a front flange 16 is provided on the front surface of the meter case 11. The front flange 16 has an outer edge portion that forms a horizontally long rectangle, projects vertically from the duct portion 12, and one end portion in the lateral direction H1 is integrated with the hood portion 13. Further, on the front surface of the front flange 16, a recessed portion 16A is formed by recessing the entire surface except the outer edge portion in a stepped manner, and the front surface of the inflow chamber 31, the intermediate chamber 32, and the outflow chamber 33 is formed in the recessed portion 16A. A component receiving port 17 that opens the whole is formed.

The above-mentioned rectifier 70 is housed in the inflow chamber 31 from the component receiving port 17, so that the gas flow can be made uniform. Further, the second and third partition walls 26 and 27 are provided with rectangular notches 29 and 29 having an opening on the component receiving port 17 side. On the other hand, the measuring tube 50 has a square cylinder shape, and a pair of frame-shaped sealing members 60, 60 fitted at positions near both ends thereof are fitted into the rectangular notches 29, 29, so that the measuring tube 50 is formed. The inflow room 31 and the outflow room 33 are in contact with each other. Further, the measuring tube 50 contains a pair of ultrasonic elements (not shown), and the propagation time of the ultrasonic waves transmitted from one ultrasonic element propagates through the fluid and is received by the other ultrasonic element. Based on the above, the control circuit on the circuit board 98 (see FIG. 2) described later calculates the amount of gas used.

As shown in FIG. 2, the receiving palate 18 has a rectangular plate shape slightly larger than the component receiving port 17, and its outer peripheral portion is screwed to the meter case 11. Further, a packing (not shown) is laid on the inner surface of the receiving palate 18 to partition the space between the inflow room 31 and the intermediate room 32 and the space between the intermediate room 32 and the outflow room 33 in an airtight state.

A cable insertion hole 18A is formed in the portion of the receiving palate 18 facing the intermediate chamber 32, and a cable (not shown) of the ultrasonic element of the measuring tube 50 is pulled out to the front side of the receiving palate 18 through the cable insertion hole 18A. ..

As shown in FIG. 4, a communication hole 77 communicating with the inside of the hood portion 13 is provided on the upper left side of the recessed portion 16A, and a cable (not shown) of the shutoff valve 20 is placed on the front side of the recessed portion 16A through the communication hole 77. It has been pulled out.

An internal pressure detection hole 78 communicating with the shutoff chamber 30 is formed in the middle portion of the left side of the recessed portion 16A, and a pressure sensor 80 shown in FIG. 2 is attached so as to close the internal pressure detection hole 78. The pressure sensor 80 has a built-in diaphragm (not shown) that receives the gas pressure and the atmospheric pressure in the shutoff chamber 30 on one of the front and back sides and the other side.

A circuit board 98 is superposed on the recessed portion 16A on the front side of the receiving palate 18. A box-shaped front cover 81 is attached so as to cover the entire front flange 16, and a first accessory room 10J according to the present invention is formed in the front cover 81.

An ultrasonic element, a shutoff valve 20, and a pressure sensor 80 are connected to the circuit board 98, and a battery (not shown) housed in the first accessory room 10J is connected to the circuit board 98 as a power source. Then, the flow rate of the fluid is measured by the control circuit mounted on the circuit board 98 by using the ultrasonic element as described above.

Further, the shutoff valve 20 is supplied with power via the switch of the circuit board 98, and the valve body 21 is usually separated from the through hole 25A. Then, when the pressure sensor 80 detects an abnormality in the gas pressure, the energization to the shutoff valve 20 is cut off, and the valve body 21 closes the through hole 25A. Further, a vibration detector is also mounted on the circuit board 98, and even when the vibration detector detects a vibration exceeding a reference value, the energization to the shutoff valve 20 is cut off and the through hole 25A is closed. ..

FIG. 5 shows the shapes of the lower surface and the rear surface of the meter case 11. A pair of lower surface ribs 61 and 62 hang down from both ends of the lateral direction H1 on the lower surface of the duct portion 12. The lower surface ribs 61 and 62 extend over the entire front-rear direction H2 on the lower surface of the duct portion 12, and the front end portion is connected to the front flange 16. Further, the lower surfaces of the lower surface ribs 61 and 62 are arranged flush with the lower surface of the front flange 16, and the lower surface of the hood portion flange 36 is located slightly above the lower surfaces of the lower surface ribs 62 and the like. Further, one lower surface rib 62 is located directly below the valve mounting wall 14 between the duct portion 12 and the hood portion 13. The lower surface groove 64 according to the present invention is formed between the lower surface rib 62 and the hood portion flange 36.

As shown in FIG. 6, a pair of ventilation holes 13B and 13B are formed side by side on the ceiling surface 64A of the lower surface groove 64. Then, as shown in FIG. 1, through these ventilation holes 13B and 13B, the second accessory room 10K in the hood portion 13, and the communication hole 77 described above, the first accessory room 10J accommodating the pressure sensor 80 is formed. Atmospheric pressure is taken in.

As shown in FIG. 6, the front end of the lower surface groove 64 is closed by the front flange 16, while the rear end of the lower surface groove 64 opens rearward as the groove end opening 65 according to the present invention. Further, the lower surface opening of the lower surface groove 64 is covered with a groove cover 15A bent at a right angle from the lower end portion of the lid body 15. As shown in FIG. 7, the groove cover 15A has a strip-like shape extending in the front-rear direction H2, and is abutted at a position near the lower end of one of the lower surface grooves 64 formed by the lower surface rib 62. .. Further, the lateral width of the groove cover 15A gradually decreases toward the front, and the gap between the tip of the groove cover 15A and the groove inner side surface 62B gradually increases toward the front. Further, the total length of the groove cover 15A is slightly shorter than the total length of the lower surface rib 62 in the front-rear direction H2, and a slight gap is formed between the front flange 16 and the front end portion of the groove cover 15A. There is. Further, the groove cover 15A is slightly inclined so as to gradually descend toward the front.

The hood portion flange 36 projects greatly rearward from the lower surface rib 62. Further, the outer surface of the chamfered inclined wall 35 at the lower end of the rear portion of the hood portion 13 has its lower portion located on the front side of the rear end of the lower surface rib 62, while the upper portion of the chamfered inclined wall 35 is located behind the rear end of the lower surface rib 62. Is located in. A stepped wall portion 82 is formed at the lower end of the outer surface of the chamfered inclined wall 35.

The lower surface of the step wall portion 82 constitutes a part (rear end portion) of the ceiling surface 64A of the lower surface groove 64. Further, the rear surface of the stepped wall portion 82, the rear surface of the lower surface rib 62, and the rear surface of the entire duct portion 12 are flush with each other and form a vertical outer surface 83 that is continuous and orthogonal to the front-rear direction H2. The upper end of the outer surface of the chamfered inclined wall 35 at the lower end of the rear portion of the hood portion 13 is located behind the vertical outer surface 83, and the rear surface 13D of the hood portion 13 (hereinafter referred to as “hood rear surface 13D”) is located above the vertical outer surface 83. It extends in a strip shape in the vertical direction, and further, the outer surface of the chamfered inclined wall 35 at the upper end of the rear portion of the hood portion 13 continues to the upper end of the rear surface 13D of the hood portion 13. A stepped surface 13E between the vertical outer surface 83 and the vertical outer surface 83 is formed on one side edge of the hood rear surface 13D.

A recess 84 according to the present invention is formed between the step wall portion 82 and the hood rear surface 13D. The upper surface of the stepped wall portion 82 located in the recess 84 forms the laterally inclined guide surface 90 according to the present invention, and one side surface in the recess 84 formed by the lower surface rib 62 is the vertical dam according to the present invention. It forms a plane 91.

As shown in FIG. 9, the laterally inclined guide surface 90 is parallel to the front-rear direction H2 and is inclined downward as it approaches the lower surface rib 62 with respect to the lateral direction H1. Further, the inclination angle of the laterally inclined guide surface 90 with respect to the lateral direction H1 is, for example, 5 to 30 degrees. On the other hand, the vertical weir blocking surface 91 is flush with one of the groove inner side surfaces 62B of the lower surface groove 64. One end of the intersection of the laterally inclined guide surface 90 and the vertically inclined surface 92 on the vertical outer surface 83 side is the rainwater discharge portion 93 according to the present invention. The ridge line R1 formed by the intersection of the groove inner side surface 62B of the lower surface groove 64 and the vertical outer surface 83 extends in the vertical direction at a position directly below the rainwater discharge portion 93. Further, the ridgeline R2 of the outer surface 62A of the lower surface rib 62 opposite to the groove inner side surface 62B of the lower surface groove 64 and the vertical outer surface 83 extends from the upper position of the rainwater discharge portion 93 to the lower end portion of the lower surface rib 62. There is. The outer surface of the chamfered inclined wall 35 above the laterally inclined guide surface 90 is hereinafter referred to as "vertically inclined surface 92".

This concludes the description of the configuration of the gas meter 10 of the present embodiment. Next, the operation and effect of the gas meter 10 of the present embodiment will be described. The gas meter 10 of the present embodiment may be installed outdoors in a place exposed to rainwater. Further, as shown in FIG. 6, the gas meter 10 includes ventilation holes 13B and 13B, but since these ventilation holes 13B and 13B are open to the ceiling surface 64A of the lower surface groove 64 of the meter case 11. Normally, rainwater does not enter the ventilation holes 13B and 13B. However, for example, when the weather suddenly changes from fine weather to rainy weather, the gas meter 10 is cooled and becomes a negative pressure state in the meter case 11. At this time, if rainwater is transmitted to the ceiling surface 64A of the lower surface groove 64, the ventilation holes 13B, A situation may occur in which rainwater enters the meter case 11 from 13B.

On the other hand, in the gas meter 10 of the present embodiment, the lower end of the band-shaped region extending upward with substantially the same lateral width from the groove end opening 65 of the lower surface groove 64 of the meter case 11 is inclined laterally with respect to the lateral direction H1. The guide surface 90 is formed in a stepped shape, and the vertical dam surface 91 rises from the lower end of the laterally inclined guide surface 90. As a result, as shown in FIG. 8, rainwater flowing down in the band-shaped region (specifically, the hood rear surface 13D, the vertically inclined surface 92) is moved to one side of the band-shaped region by the laterally inclined guide surface 90. After being guided, it is dammed by the vertical weir surface 91, and is discharged from the rainwater discharge portion 93 at one end of the intersection of the laterally inclined guide surface 90 and the vertical dam surface 91 to one side edge of the groove end opening 65. Then, rainwater flows down along the ridges R1 and R2 of the one side edge portion and falls below the lower surface groove 64.

That is, as shown in FIG. 9, if the laterally inclined guide surface 90 is not provided, rainwater flowing down the hood rear surface 13D and the vertically inclined surface 92 in the strip-shaped region can be transmitted to the ceiling surface 64A of the lower surface groove 64. In the gas meter 10 of the present embodiment, as shown in FIG. 8, by providing the laterally inclined guide surface 90, rainwater is guided to one side edge portion of the groove end opening 65, and the one side edge portion thereof is rained. It can be used as a gutter and guided below the lower surface groove 64. As a result, the transmission of rainwater to the ceiling surface 64A of the lower surface groove 64 is restricted, and the infiltration of rainwater into the ventilation holes 13B and 13B is suppressed.

Further, the laterally inclined guide surface 90 and the vertical damming surface 91 may be provided as the upper surface or the side surface of the protruding portion protruding from the rear surface of the meter case 11, but may be provided as the inner surface of the recess 84 as in the present embodiment. , It is possible to prevent the protrusion from being caught by a foreign object.

The lower surface groove 64 may be formed in a state of being depressed in the lower surface of the meter case 11, but in the present embodiment, the lower surface rib 62 protruding from the lower surface of the meter case 11 is a groove inner surface 62B of one of the lower surface grooves 64. Since one side edge portion of the groove end opening 65 described above is composed of the side edge portion of the lower surface rib 62, the two ridge lines R1 and R2 on the front and back sides of the side edge portion of the lower surface rib 62 are used. Therefore, rainwater can be stably guided vertically downward. Moreover, since one of the ridgelines R2 extends above the rainwater discharge portion 93 and an intermediate portion thereof approaches the rainwater discharge portion 93, the ridgeline R2 is transmitted from the rainwater discharge portion 93 to one of the groove end openings 65. Rainwater is stably transmitted to the side edges.

Further, in the present embodiment, the communication hole 77 penetrates the upper part of the wall portion partitioning between the first and second accessory rooms 10J and 10K, and the ventilation holes 13B and 13B penetrate the bottom of the second accessory room 10K. Since it penetrates, even if water enters the second accessory room 10K from the ventilation holes 13B and 13B, it is possible to prevent water from entering the first accessory room 10J accommodating the pressure sensor 80. .. Moreover, since the lower surface groove 64 is covered from below by the groove cover 15A bent at a right angle from the lower end of the lid 15 that closes the opening 13K of the second accessory room 10K, the ventilation holes 13B and 13B are also covered in this respect. Infiltration of rainwater into the water is suppressed. Even if rainwater falls on the groove cover 15A, the groove cover 15A is inclined so that the rainwater does not collect on the groove cover 15A.

[Other embodiments]
The present invention is not limited to the above-described embodiment, and for example, embodiments as described below are also included in the technical scope of the present invention, and various other than the following, as long as they do not deviate from the gist. It can be changed and implemented.

(1) The gas meter 10 of the above embodiment is configured to measure the flow rate of gas by using a pair of ultrasonic elements, but what is the principle of measuring the flow rate of the gas meter according to the present invention? There may be.

(2) The laterally inclined guide surface 90 of the embodiment is inclined in the lateral direction H1 which is the width direction of the band-shaped region, and is parallel to the front-rear direction H2, but is inclined with respect to the front-rear direction H2. May be. Further, the vertical dam surface 91 may also be inclined with respect to the vertical direction.

(3) The laterally inclined guide surface 90 of the embodiment was arranged inside the recess 84 provided on the rear surface of the meter case 11, but the recess is not provided, and for example, the protrusion protruding from the rear surface of the meter case 11. A laterally inclined guide surface 90 and a vertical weir surface 91 may be provided on the upper surface and the side surface of the above.

10 Gas meter 10J 1st accessory room 10K 2nd accessory room 11 Meter case 13B Vent 13K Opening 15 Lid 15A Groove cover 61, 62 Bottom rib 62A Outer side surface (the other side of the front and back)
62B Groove inner side surface (one side of front and back)
64 Bottom groove 64A Ceiling surface 65 Groove end opening 77 Communication hole 80 Pressure sensor 84 Recessed 90 Horizontally inclined guide surface 91 Vertical weir stop surface 93 Rainwater discharge part

Claims (6)

In a gas meter that measures the flow rate of gas passing through the meter case and detects abnormalities in gas pressure in the flow path by comparing it with atmospheric pressure by a pressure sensor housed in an accessory room adjacent to the gas flow path. ,
A lower surface groove formed on the lower surface of the meter case, extending horizontally, and having a groove end opening whose end is an opening at a lower position on the outer surface of the meter case.
A ventilation hole that opens to the ceiling surface in the lower surface groove and takes in atmospheric pressure in the accessory room,
The outer surface of the meter case is formed in a stepped manner at the lower end of a band-shaped region extending upward from the groove end opening with substantially the same width as the groove end opening, and is inclined with respect to the width direction of the band-shaped region to form the band-shaped region. A laterally inclined guide surface that receives rainwater flowing down and guides it to one side of the band-shaped region,
A vertical dam surface that rises upward from the lower end of the laterally inclined guide surface and blocks rainwater guided by the laterally inclined guide surface.
A gas meter having a rainwater discharge portion located at one end of an intersection of the laterally inclined guide surface and the vertical weir stop surface and discharging rainwater from above on one side edge of the groove end opening. The gas meter according to claim 1, further comprising a recess formed in the band-shaped region, having the laterally inclined guide surface at the inner lower portion thereof, and having the vertical damming surface at the inner one side portion. 1. Claim 1 having a rib shape protruding from the lower surface of the meter case, and one surface of the front and back surfaces thereof includes a lower surface rib constituting one inner surface of the lower surface groove on the one side edge side of the groove end opening. Or the gas meter according to 2. The gas meter according to claim 3, wherein the other surface of the front and back surfaces of the lower surface rib is extended from the lower end portion of the laterally inclined guide surface to the upper side. The ancillary room includes a first ancillary room for accommodating the pressure sensor, and a second ancillary room provided adjacent to the first ancillary room across a partition wall and having a bottom through which the vent hole penetrates. The gas meter according to any one of claims 1 to 4, wherein a communication hole communicating between the first and second accessory rooms penetrates the upper end portion of the partition wall. The second accessory room has a lid that opens horizontally and closes the opening.
The bottom groove extends along the lower opening edge of the second accessory chamber.
The gas meter according to claim 5, further comprising a groove cover that is bent at a right angle from the lower end of the lid and covers the lower surface groove from below.

Images