JP2006349642A - Cabinet for gas meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cabinet of a gas meter which is prevented from being sealed by a water membrane. <P>SOLUTION: The cabinet main body 10 accommodates a gas flow path and an electronic equipment including a pressure sensor for measuring the difference pressure between the pressure of the flowing path and the atmospheric pressure. The interior and the exterior of the cabinet 10 are communicated with a ventilation hole. The cover 30 covers over the ventilation hole. Between the cabinet main body 10 and the cover 30, the clearances Ss and Sb reaching the whole periphery of the cover edge 30 from the ventilation hole are provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a housing for a gas meter, and in particular, a housing body in which an electronic device including a gas flow path through which gas flows and a pressure sensor that measures a pressure difference between the pressure in the gas flow path and atmospheric pressure is accommodated. In addition, the present invention relates to a gas meter casing including a vent hole for ventilating the inside and outside of the casing body and a cover that covers the vent hole.

  In recent gas meter housings, not only the gas flow path and the metering mechanism of the gas flowing through the gas flow path and its display mechanism, but also a pressure sensor for measuring the pressure in the gas flow path is built in to ensure safety. Yes. For example, a pressure sensor is used to detect an abnormal pressure in which gas that exceeds the normal pressure range flows, and the gas management company shuts off the gas flow path according to the detection of this abnormal pressure or reports that an abnormal pressure has occurred. To automatically report.

  The pressure sensor described above is arranged at the boundary between the gas flow path and the atmospheric pressure chamber maintained at atmospheric pressure, and measures the differential pressure between the pressure in the gas flow path and the atmospheric pressure, and from this differential pressure, the gas flow path Measure the pressure inside. For this reason, it is necessary to introduce the atmosphere into the gas meter casing, and it is necessary to provide a ventilation structure to the gas meter casing.

  Conventionally, as such a ventilation structure, a structure as shown in FIG. 7 has been proposed (for example, Patent Document 1). FIG. 7A is an exploded perspective view showing an example of a conventional gas meter casing, and FIG. 7B is a cross-sectional view of the gas meter casing shown in FIG. As shown in the figure, the casing body 100 has a recessed portion 110a formed on one side of the lower end of the back surface thereof. Then, the opening surface of the recessed portion 110a is closed with a back cover 300 as a cover through the packing 120, whereby a lead wire accommodating space 150 for the lead wire 140 having a predetermined volume is formed inside thereof. .

  In addition, a circular inner ventilation hole 400 is formed on the upper end side of the lead wire accommodating space 150 so as to communicate with the inside and outside by drilling the recessed portion 110 a of the housing body 100. Further, an outer vent hole 160 that opens downward is formed at the lower end of the lead wire accommodating space 150. The outer vent hole 160 is formed to be small in order to prevent entry of minute insects such as ants and moths.

  By the way, although a gas meter is generally often installed outdoors such as a garden, the inside of the gas meter may reach a high temperature of 60 ° in summer. In such a high temperature state, when water is sprayed nearby or when a sunset occurs, water jumps up from the ground and enters the outer vent hole 160 provided at the lower end, and a water film is put on the outer vent hole 160. The ventilation through the outer ventilation hole 160 is not possible, and the inside of the housing body 100 is sealed.

  When the inside 100 of the casing is rapidly cooled in such a state, the inside 100 of the casing is suddenly depressurized, and as soon as the water film that has entered the outer vent hole 160 is broken, water droplets and moisture from the outer vent hole 160 together with the outside air. Is sucked in vigorously. For this reason, electrical troubles such as dielectric breakdown and rusting have occurred in the built-in electronic devices and printed circuit boards, causing failure. In addition, there is a problem in that pressure cannot be measured by a pressure sensor when ventilation cannot be performed and the housing body 100 is in a sealed state.

Therefore, conventionally, the inner vent 400 is provided at a position 20 mm or more upward from the outer vent 160. However, in this case, there is a problem that the positions of the inner vent hole 400 and the outer vent hole 160 are limited. Further, the problem that a water film is applied to the outer vent hole 160 and the inside of the housing is sealed is still not solved.
Japanese Utility Model Publication No. 4-120330 Japanese Utility Model Publication No.6-2159 Japanese Utility Model Publication No. 6-80131 JP-A-8-327425 Japanese Patent Laid-Open No. 11-148850 JP-A-11-237270 JP 2001-24348 A

  Therefore, the present invention focuses on the above-described problems, and an object of the present invention is to provide a gas meter housing that prevents the gas meter housing from being sealed by a water film.

  The invention according to claim 1, which has been made in order to solve the above-described problem, contains an electronic device including a gas flow path through which a gas flows and a pressure sensor that measures a pressure difference between the pressure in the gas flow path and the atmospheric pressure. And a cover for covering the ventilation hole, wherein the cover is disposed between the casing body and the cover. The gas meter casing is characterized in that a gap is provided from the vent hole to the vertical upper end and the vertical lower end of the cover.

  According to the first aspect of the present invention, the gap reaching the vertical upper end and the vertical lower end of the cover from the air hole is provided between the housing body and the cover. Therefore, the water splashed from the ground does not reach the gap entrance formed at the vertical upper end of the cover, and can be ventilated from the gap reaching the vertical upper end. Further, the water poured from the vertical upper side does not reach the gap entrance formed at the vertical lower end of the cover, and can be ventilated from the gap reaching the vertical lower end. For this reason, even if water jumps from the ground or pours from the vertical upper side, the water film does not stretch on both the gap inlet formed at the vertical upper end and the gap inlet formed at the vertical lower end.

  The invention according to claim 2 is characterized in that the gap is provided so as to reach one end in the horizontal direction and the other end in the horizontal direction of the cover from the vent hole. Existing in the housing.

  According to the invention described in claim 2, the gap is provided so as to reach the horizontal one side end and the horizontal other side end of the cover from the vent hole. Therefore, the water that has been poured down from the vertical upper side to the vertical lower side or from the vertical lower side to the vertical upper side is poured into the gap inlet formed at the horizontal one end directly. The air can be ventilated from the gap reaching the other end in the horizontal direction without being blown. In addition, the water that has poured down and jumped up from the vertical upper side toward the vertical lower side or from the vertical lower side toward the vertical upper side is poured directly into the gap inlet formed at the end portion on the other side in the horizontal direction. The air can be ventilated from the gap reaching the other end in the horizontal direction without being blown. For this reason, even if the water is inclined to the other side in the horizontal direction and falls down or jumps up, or even if it is inclined to the one side and drops or jumps up, the gap inlet formed at the end on the one side in the horizontal direction and the horizontal direction A water film does not stick to both of the gap inlets formed on the other side.

  According to a third aspect of the present invention, there is provided the gas meter casing according to the first or second aspect, wherein the gap is provided so as to reach the entire circumference of the cover end from the vent hole.

  According to invention of Claim 3, the clearance gap was provided so that it might reach a cover edge part perimeter from a vent hole. Therefore, by providing a gap inlet around the entire periphery of the cover end, it is possible to provide a gap inlet portion where a water film does not come off reliably even if water falls into the casing from any direction.

  According to a fourth aspect of the present invention, there is provided a large gap inlet in which the gap is formed by making a gap width of a part of the gap inlet provided at the end of the cover larger than a gap width of other gap inlets. 4. A large gap portion that reaches the ventilation hole from the gap inlet and that is larger than the gap width of the other gap inlet, and has a mesh attached to the large gap portion. Or the gas meter housing according to claim 1.

  According to the fourth aspect of the present invention, the mesh is attached to the large gap portion that reaches the vent hole from the large gap inlet and is larger than the gap width of the other gap inlet. Therefore, the other gap inlets other than the large gap inlet can be made smaller to prevent the entry of minute insects from the other gap inlets. Furthermore, since the large gap inlet and the large gap portion are formed larger than the gap width of the other gap inlet, even if water enters the large gap portion from the large gap inlet, the large gap inlet and the large gap portion The water film is difficult to stretch, and it is possible to ensure the ventilation. In addition, by attaching a mesh to the large gap portion, it is possible to prevent microworms from entering the inside through the large gap.

  The invention according to claim 5 resides in the gas meter casing according to claim 4, wherein the mesh is mounted at a position shifted from a position exposed through the entrance of the large gap portion.

  According to the fifth aspect of the present invention, the mesh is mounted at a position shifted from the position exposed through the large gap portion entrance. Accordingly, since the mesh is mounted so as not to be exposed from the entrance of the large gap portion, even when water is sprayed from the entrance of the large gap portion toward the inside, the mesh is not directly blown. For this reason, it can prevent that a water film sticks on a mesh.

  A sixth aspect of the invention resides in the gas meter casing according to any one of the first to fifth aspects, wherein a plurality of the vent holes are provided.

  According to the invention of claim 6, a plurality of vent holes are provided. Therefore, even if any one of the vent holes is blocked, the remaining vent holes can be ventilated.

  As described above, according to the first aspect of the present invention, the water splashed from the ground does not reach the gap entrance formed at the vertical upper end of the cover, and vents from the gap reaching the vertical upper end. Can do. Further, the water poured from the vertical upper side does not reach the gap entrance formed at the vertical lower end of the cover, and can be ventilated from the gap reaching the vertical lower end. For this reason, even if water jumps up from the ground, even if it pours from the vertical upper side, the water film does not stretch on both the gap inlet formed at the vertical upper end and the gap inlet formed at the vertical lower end, The inside of the gas meter housing is not sealed by the water film.

  According to the second aspect of the present invention, the water that has been poured down or slanted in the horizontal direction from the vertical upper side toward the vertical lower side or from the vertical lower side toward the vertical upper side, The air is not directly blown into the gap inlet formed in the, and can be ventilated from the gap reaching the other end portion in the horizontal direction. In addition, the water that has poured down and jumped up from the vertical upper side toward the vertical lower side or from the vertical lower side toward the vertical upper side is poured directly into the gap inlet formed at the end portion on the other side in the horizontal direction. The air can be ventilated from the gap reaching the other end in the horizontal direction without being blown. For this reason, even if the water is inclined to the other side in the horizontal direction and falls down or jumps up, or even if it is inclined to the one side and drops or jumps up, the gap inlet formed at the end on the one side in the horizontal direction and the horizontal direction Since a water film does not stick to both of the gap inlets formed on the other side, it is possible to prevent the gas meter casing from being sealed even more reliably.

  According to the third aspect of the present invention, by providing the gap inlet around the entire periphery of the cover end, it is possible to provide the gap inlet portion where the water film does not come off reliably even if water falls into the casing from any direction. As a result, the gas meter casing can be more reliably prevented from being sealed.

  According to the fourth aspect of the present invention, it is possible to make the other gap inlets other than the large gap inlet smaller, thereby preventing minute insects from entering the other gap inlets. Furthermore, since the large gap inlet and the large gap portion are formed larger than the gap width of the other gap inlet, even if water enters the large gap portion from the large gap inlet, the large gap inlet and the large gap portion The water film is difficult to stretch, and it is possible to ensure the ventilation. In addition, by attaching a mesh to the large gap portion, it is possible to prevent microscopic insects from entering the inside through the large gap, thereby preventing the gas meter casing from being sealed more reliably. Invasion of minute worms can also be prevented.

  According to the fifth aspect of the present invention, since the mesh is mounted so as not to be exposed from the large gap portion entrance, even if water is sprayed from the large gap portion inlet toward the inside, the mesh can be directly blown. Absent. For this reason, since it can prevent that a water film sticks to a mesh, it can prevent the invasion of a minute insect while preventing the gas meter housing from being sealed more reliably.

  According to the sixth aspect of the present invention, even if any one of the vent holes is blocked, the remaining vent holes can be ventilated, so that venting can be performed reliably.

  Hereinafter, an embodiment of a gas meter casing of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a gas meter casing of the present invention. 2A is a front view of the housing main body 10 shown in FIG. 1, and FIG. 2B is a rear view of the cover 30 shown in FIG. FIG. 3 is a rear oblique view of the cover 30 shown in FIG. 4 is a partial cross-sectional view taken along the line II of the housing body 10 and the cover 30 shown in FIG. FIGS. 5A to 5D are respectively a top and bottom view and a left and right side view of the gas meter casing shown in FIG.

  As shown in FIGS. 1 and 2, a gas inlet 11 and a gas outlet 12 are provided on the top surface of the box-shaped housing body 10. In the housing body 10, a gas flow path communicated between the gas inlet 11 and the gas outlet 12, a measuring mechanism for the gas flowing in the gas flow path, a display for displaying the measured value, a gas A pressure sensor (none of which is shown) for measuring the pressure difference between the pressure in the flow path and the atmospheric pressure and a substrate on which various electronic components such as a display are mounted are accommodated.

  A substantially rectangular opening 14 is formed in the front surface 13 of the housing body 10 for inserting the above-described display mechanism, a substrate on which a pressure sensor is mounted, and the like. On the front surface 13 of the housing main body 10, a packing accommodating projection 15 is provided in which a groove for accommodating a rubber packing (not shown) is formed along the entire periphery of the opening 14.

  As shown in FIGS. 2B and 3, an exposure hole 31 for exposing the display is formed in the cover 30 that covers the front surface 13 of the housing body 10. The periphery of the exposure hole 31 is closed by a substrate on which a display is mounted. Further, an airtight protrusion 33 is provided on the back surface 32 of the cover 30 at a position facing the packing accommodating protrusion 15. By sandwiching the packing between the airtight projection 33 and the packing accommodating projection 15, the space between the periphery of the opening 14 and the cover 30 is kept airtight and watertight.

  Further, the airtight projection 33 is formed with a notch 33a penetrating from the outer periphery toward the inner periphery. Three notches 33a are provided in the horizontal direction Y1 at the lower end of the airtight projection 33. As shown in FIG. 4, the space between the above-described notch 33 a and the packing accommodating protrusion 15 facing the notch 33 a or the packing accommodated in the packing accommodating protrusion 15 is within the casing body 10. It becomes the ventilation hole 40 for ventilating and the exterior. Naturally, the vent hole 40 is covered with the cover 30 so as not to be exposed to the outside.

  Further, as shown in FIGS. 2B and 3, a U-shaped peripheral protrusion 34 is erected on the back surface 32 of the cover along the upper end and both ends in the horizontal direction Y <b> 1. The peripheral protrusion 34 does not reach the lower ends of the left and right ends in the horizontal direction Y1. The peripheral protrusion 34 has a low-stage protrusion 34a formed at the end and a high-stage protrusion 34b higher than the low-stage protrusion 34a. The height of the high-step protrusion 34 b is lower than the combined height of the packing accommodating protrusion 15 of the housing body 10 and the airtight protrusion 33 of the cover 30.

  Therefore, as shown in FIGS. 5A, 5C, and 5D, when the front surface 13 of the housing body 10 is covered with the cover 30, the peripheral protrusion 34 of the cover and the housing that faces the peripheral protrusion 34 are opposed. A gap is formed between the body 13 and the front surface 13. Moreover, since the low step protrusion 34a is formed lower than the high step protrusion 34b, the gap width between the low step protrusion 34a and the front surface 13 of the housing body 10 facing the low step protrusion 34a. Wb is larger than the gap width Ws between the high-stage protrusion 34b and the front surface 13 of the housing body 10 facing the high-stage protrusion 34b.

  Further, as shown in FIGS. 1 and 2A, the front end 13 of the housing body 10 has a lower end protrusion 16 extending from the center of the lower end of the packing accommodating protrusion 15 to the entire lower end of the case body 10. Is erected. The lower end protrusion 16 is formed higher than the packing accommodating protrusion 15 and is formed lower than the combined height of the packing accommodating protrusion 15 and the airtight protrusion 33. Accordingly, as shown in FIGS. 5B to 5D, a gap is formed between the lower end protrusion 16 of the housing body 10 and the back surface 32 of the cover 30 facing the lower end protrusion 16. The height of the lower end protrusion 16 is determined such that the gap width is the same as the gap width Ws between the high-stage protrusion 34 b and the front surface 13 of the housing body 10.

  Further, on the front surface 13 of the housing body 10, a protrusion 17 lower than the packing accommodation protrusion 15 is provided upright along both horizontal ends at the lower end of the packing accommodation protrusion 15. Accordingly, the gap width between the protrusion 17 and the back surface 32 of the cover 30 facing the protrusion 17 is larger than the gap between the lower end protrusion 16 and the cover 30 back surface 32.

  As is clear from the above configuration, a gap is formed between the casing body 10 and the cover 30 described above so that there is a gap between the packing housing projection 15 and the airtight projection 33. ing. That is, in the gas meter casing, as shown in FIG. 5, a gap S is formed between the casing body 10 and the cover 30 so as to reach the entire periphery of the end of the cover 30 from the vent hole 40.

  That is, as shown in FIGS. 5A and 5B, a gap is formed between the housing body 10 and the cover 30 so as to reach the vertical upper end Tus and the vertical lower end Tds of the cover 30 from the vent hole 40. Provided. As a result, water jumps up from the ground, reaches the inlet of the gap S formed at the vertically downward end Tds of the cover 30, and a water film is stretched around the inlet of the gap S to be blocked. However, the splashed water rarely reaches the vertical upper end Tus of the cover 30, and the outside air is surely discharged from the gap S inlet formed in the vertical upper end Tus through the vent hole 40 into the housing body 10. Can be captured.

  On the other hand, water may pour down from the vertical upper side toward the vertical lower side, and a water film may be stretched and blocked at the gap S inlet formed at the vertical upper end Tus of the cover 30. Further, when the water poured from the vertical upper side flows down the vertical direction along the side surface of the gas meter casing, the water enters the gap S formed in the left and right end portions Tls and Trs of the cover 30, and water enters the gap S inlet. The membrane may be stretched and blocked.

  However, since the water poured from the upper vertical side flows down vertically along the side surface of the gas meter casing, it does not reach the entrance of the gap S formed at the vertical lower end portion Tds of the cover 30, Outside air can be reliably taken into the inside of the housing body 10 through the vent hole 40 from the entrance of the gap S formed in the side end portion Tds.

  For this reason, even if the water jumps from the ground or pours from the vertical upper side toward the vertical lower side, both the gap S inlet formed in the vertical upper end Tus and the gap S inlet formed in the vertical lower Tds The film is not stretched and a water film is not stretched all over the gap S inlet at the end of the cover 30 to seal the inside of the gas meter housing, so that water can be prevented from entering the housing body 10. can do.

  Further, as shown in FIGS. 5C and 5D, the left end Tls and the right end Trs (= one side end in the horizontal direction) of the cover 30 from the ventilation hole 40 between the housing body 10 and the cover 30. Part, a horizontal direction other side edge part), and the clearance gap S which reaches is provided. As shown by arrows Y21 and Y22 in FIG. 2, when the water is poured down and jumps up from the vertical upper side to the vertical lower side or from the vertical lower side to the vertical upper side in the horizontal direction Y1, the left end Water may be sprayed directly on the entrance of the gap S formed in Tls, and a water film may be stretched and blocked at the entrance of the gap. However, water is not directly blown into the gap S inlet formed in the right end Trs, and the outside air enters the housing body 10 from the gap S inlet formed in the right end Trs through the vent hole 40. Can be imported.

  In addition, as shown by arrows Y31 and Y32 in FIG. 2, the water is poured down from the vertical upper side or vertically downward or from the vertical lower side toward the vertical upper side in the horizontal direction Y1 and splashes and jumps up to the right end Trs. Water may be sprayed directly on the formed gap S inlet, and a water film may be stretched and blocked at the gap S inlet. However, water is not directly blown into the gap S inlet formed in the left end Tls, and the outside air can be taken into the housing body 10 through the vent hole 40 from the gap S inlet.

  For this reason, even if water inclines down and jumps up to the right in the horizontal direction Y1, and even if it inclines down and jumps up to the left in the horizontal direction Y1, the gap S inlet and the left end formed at the right end Trs Water does not stretch on both inlets of the gap S inlet formed in the portion Tls, and a water film does not stretch on all the gap S inlets at the end of the cover 30 so that the inside of the gas meter casing is sealed. Water can be prevented from entering the housing body 10.

  Moreover, the gap described above is provided not to be a part of the end portion of the cover 30 but to reach the entire periphery of the end portion of the cover 30. For this reason, there is a gap entrance where water can not be directly sprayed even if water pours from any direction, and a water film rarely occurs in all the gap S inlets provided on the entire periphery of the cover 30 end. This prevents the gas meter casing from being sealed even more reliably and prevents water from entering the interior.

  Further, as shown in FIG. 5, the above-described high-stage protrusion 34b of the cover 30 and the front surface 13 of the housing body 10 facing the high-stage protrusion 34b, and the lower end protrusion 16 of the housing body 10 and the back surface of the cover 30 facing the same. 32 forms a small gap inlet Ss having a gap width Ws. The gap width Ws of the small gap inlet Ss is formed to be, for example, 0.5 mm or less, incapable of invading minute insects such as ants and moths. Further, a large gap inlet Sb having a gap width Wb is formed by the low step protrusion 34a of the cover 30 and the back surface 32 of the cover 30 facing the low protrusion 34a. The large gap inlet Sb is formed larger than the gap width Ws of the small gap width Ss.

  Further, the large gap inlet Sb is a gap between the front surface 13 of the housing body 10 and the back surface 32 of the cover 30 opposed thereto, as shown by an arrow Y4 in FIG. And the back surface 32 of the cover 30 opposed to the air hole 40 communicate with the vent hole 40. As is clear from the above-described configuration, the gap between the front surface 13 of the housing body 10 and the back surface 32 of the cover 30 facing the housing 13, the protrusion 17 of the housing body 10, and the cover 30 facing the housing 30. The gap width between the back surface 32 and the back surface 32 is formed larger than the gap width Ws of the small gap inlet Ss, and these gaps correspond to the large gap portion.

  According to the above configuration, it is possible to reduce the gap width Ws of the small gap inlet Ss and prevent the minute insects from entering the small gap inlet Ss. Further, since the large gap inlet Sb and the large gap portion described above are formed larger than the gap width of the small gap inlet Ss, even if water enters the large gap inlet Sb or the large gap portion, A water film is difficult to stick to the large gap inlet Sb. For this reason, the ventilation | gas_flowing in a housing | casing can be ensured still more reliably.

  By the way, the gap width of the large gap portion and the large gap inlet Sb is formed large in order to make it difficult to stretch the water film. For this reason, micro-worms such as ants and moths enter the vent 40 through the large gap inlet Sb and the large gap part, or the large gap part closes the large gap part by nesting in the large gap part. There is a fear. Therefore, as shown in the partial cross-sectional view shown in FIG. 6, the gas meter housing has a mesh 50 a formed in the gap between the front surface 13 of the housing body 10 having the largest gap width and the back surface of the cover 30. The mesh plate 50 is attached. The mesh plate 50 is opposed to a gap entrance between the protrusion 17 of the housing body 10 and the back surface 32 of the cover 30 that communicates with a gap between the front surface 13 of the housing body 10 and the back surface 32 of the cover 30. Thus, a mesh 50a is formed.

  Accordingly, since the mesh 50a formed on the mesh plate 50 closes the gap entrance between the protrusion 17 of the housing body 10 and the back surface 32 of the cover 30, the microworm that has entered through the large gap portion. Can be prevented from entering earlier and entering into the vent hole 40. For this reason, it is possible to prevent the entry of microscopic insects into the housing body 10 while preventing the gas meter housing from being sealed more reliably. Furthermore, since the mesh 50a is mounted at a position shifted from the position exposed through the large gap inlet Sb, the water blown into the inside from the large gap inlet Sb is not directly blown onto the mesh 50a. For this reason, it can prevent that a water film affixes on the mesh 50a and a large clearance gap part is block | closed.

  Further, by providing two ventilation holes 40 as described above, even if any one of the ventilation holes 40 is blocked, ventilation can be performed with the remaining ventilation holes, so that ventilation can be performed reliably. It has become. In the present embodiment, two vent holes 40 are provided, but the present invention is not limited to this, and three or more vent holes 40 may be provided.

  In the above-described embodiment, as shown in FIG. 4, the vent hole 40 is formed by the notch 33 a provided in the packing accommodating projection 15 erected on the periphery of the opening 14 and the airtight projection 33 of the cover 30. Was forming. However, the present invention is not limited to this, and any ventilation hole that ventilates the inside and outside of the casing body 10 and is covered by the cover 30 can be used. For example, as shown in FIG. The opening may be used as a vent hole.

  Further, in the above-described embodiment, between the cover 30 and the housing body 10, the air vent 40 extends to the entire edges of the vertical upper end Tus, the vertical lower end Tds, and the left and right end Tls, Trs of the cover 30. A reaching gap was formed. However, the present invention is not limited to this, and a gap reaching the vertical upper end Tus, the vertical lower end Tds and the left and right ends Tls, Trs of the cover 30 may be formed, and the vertical upper end Tus. The vertical lower end Tds and the left and right ends Tls and Trs may have portions where no gap entrance is formed.

  Further, in the above-described embodiment, the gaps that reach the vertical upper end Tus, the vertical lower end Tds, and the left and right ends Tls, Trs of the cover 30 from the vent hole 40 between the cover 30 and the housing body 10. However, the present invention is not limited to this, and it is sufficient that a gap reaching at least the vertical upper end Tus and the vertical lower end Tds of the cover 30 is formed, and a gap is formed between the vertical left and right ends Tls and Trs. The inlet may not be formed.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

It is a disassembled perspective view of the housing | casing for gas meters of this invention. (A) is a front view of the housing body 10 shown in FIG. 1, and (b) is a rear view of the cover 30 shown in FIG. It is a back side oblique view of the cover 30 shown in FIG. FIG. 3 is a partial cross-sectional view taken along the line II of the housing body 10 and the cover 30 illustrated in FIG. 2. (A)-(d) is respectively the upper-lower surface figure and right-and-left side view of the housing | casing for gas meters shown in FIG. FIG. 3 is a partial cross-sectional view taken along the line II-II of the housing body 10 and the cover 30 illustrated in FIG. 2. (A) is a disassembled perspective view which shows an example of the conventional housing | casing for gas meters, (b) is sectional drawing of the housing | casing for gas meters shown to (a).

Explanation of symbols

10 Housing Body 30 Cover 50a Mesh Tds Vertical Lower End Tus Vertical Upper End Tls Left End (Horizontal One End)
Trs Right end (horizontal other end)
Ss Small gap entrance (other part of gap entrance)
Sb Large gap entrance

Claims (6)

A casing main body in which an electronic device including a gas flow path through which a gas flows and a pressure sensor that measures a pressure difference between the pressure in the gas flow path and the atmospheric pressure is housed, and the inside and outside of the casing main body are ventilated. In a gas meter housing comprising a vent hole for the purpose and a cover covering the vent hole,
A gas meter casing, wherein a gap is provided between the casing body and the cover so as to reach a vertical upper end and a vertical lower end of the cover from the vent hole.   The gas meter casing according to claim 1, wherein the gap is provided so as to reach one end in the horizontal direction and the other end in the horizontal direction of the cover from the vent hole.   The gas meter casing according to claim 1, wherein the gap is provided so as to reach the entire circumference of the cover end from the vent hole. The gap reaches a vent from the large gap inlet formed by making the gap width of a part of the gap inlet provided at the end of the cover larger than the gap width of other gap inlets. And a large gap portion larger than the gap width of the other gap inlet,
The gas meter casing according to any one of claims 1 to 3, further comprising a mesh attached to the large gap portion.   The gas meter casing according to claim 4, wherein the mesh is mounted at a position shifted from a position exposed through the large gap portion entrance.   The gas meter casing according to claim 1, wherein a plurality of the vent holes are provided.

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