JP2016138857A - Fitting structure for gas meter and case body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting structure for a gas meter that can prevent a shot ball of a shot blast from entering a reverse surface side of a web plate to be accumulated.SOLUTION: The present invention is directed to a web plate fitting structure for a gas meter that comprises a case body 1 provided with a recessed part 15 for a metering chamber in the front, and is fitted with a web plate 4 so as to cover the recessed part 15 for the metering chamber including a web plate fitting part 5 from a front side while the web plate fitting part 5 swelling forward is formed at an outer peripheral edge part of the recessed part 15 for the metering chamber of the case body. In a front view of the case body 1, the web plate fitting part 5 is formed such that the entire periphery of an outer contour 5L of the web plate fitting part 5 is closed to a contour 4L of the web plate 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas meter belly plate mounting structure and a case body for measuring a gas flow rate.

  As a gas meter installed to measure the amount of gas used (flow rate) in each home, restaurant, etc., as shown in Patent Document 1, a mechanical type membrane gas meter that operates with gas pressure is generally used in many cases. Yes.

  FIG. 5 is a front view showing a case body in a conventional membrane gas meter, and FIG. 6 is a cross-sectional view showing a conventional abdominal plate mounting structure, which is a cross-sectional view corresponding to a cross section taken along line AA of FIG. In FIG. 5, the outline 94L of the abdomen 94 to be attached to the case body 9 is indicated by an imaginary line (two-dot chain line).

  As shown in both figures, a measurement chamber recess 91 is formed on the front surface of the case body 9, and the outer peripheral edge of the measurement chamber recess 91 is raised so that the outer periphery rises forward. A plate attachment portion 92 is formed. In a state where the measurement film 93 is arranged so as to close the measurement chamber recess 91, the abdomen 94 is screwed and fixed to the front surface of the case body 9 so as to cover the measurement film 93. In this state, the measurement membrane 93 is fixed by the outer peripheral edge portion 931 being sandwiched between the abdominal plate attachment portion 92 of the case body 9 and the outer peripheral edge portion on the back side of the abdominal plate 94.

  In such a conventional gas meter, a threaded hole 921 is formed in the abdominal plate mounting portion 92 of the case body 9 at intervals in the circumferential direction, and corresponds to the threaded hole 921 in the abdominal plate mounting portion 92. The portion (screwing portion) 922 projects outward and is formed with a wide width, while the portion other than the screwing portion 922 is formed with a narrow width.

  On the other hand, the outline 94L of the abdominal plate 94 is set so as to pass outside the screwing portion 922 so that the abdominal plate 94 can cover an area including the screwing portion 922 in the case body 9.

  For this reason, in the portion other than the screwing portion 922 in the abdominal plate attachment portion 92, the interval between the contour line 94L of the abdominal plate 94 and the outer contour line 92L of the abdominal plate attachment portion 92 is widened. A wide gap 95 (see FIG. 6) that opens to the outside of the meter is formed on the back side.

JP 2006-177805 A

  By the way, the gas meter as described above has a set expiration date, and when the expiration date has passed, it is replaced with a new gas meter. On the other hand, gas meters (used gas meters) after the expiration date are often inspected and repaired or repaired as necessary, but they are generally used. When checking a gas meter, the paint on the meter surface is removed by shot blasting.

  However, when the coating of the gas meter is peeled off by shot blasting, if a wide gap 95 is formed on the back side of the outer peripheral edge of the abdomen 94 as shown in FIG. (Shot ball) gets in and accumulates. If shot balls accumulate in the gap portion 95 on the back side of the abdomen, the troublesome work of removing the shot balls accumulated in the gap portion 95 is necessary, and it is difficult to perform inspection and repair work on the gas meter. The problem that it is.

  The present invention has been made in view of the above problems, and is a gas meter that can prevent shot balls from entering the back side of the outer peripheral edge of the abdominal plate when surface-treating the gas meter by shot blasting. An object of the present invention is to provide a belly plate attachment structure and a case body.

  In order to solve the above problems, the present invention comprises the following means.

[1] A case main body provided with a concave portion for the measurement chamber is provided on the front surface, and an abdominal plate mounting portion that protrudes forward is formed on the outer peripheral edge of the concave portion for the measurement chamber in the case main body. A gas meter belly plate mounting structure in which a belly plate is mounted so as to cover the concave portion for the measurement chamber including the portion from the front side,
In the front view when the case body is viewed from the front, the abdominal plate mounting portion is formed so that the entire circumference of the outer contour line of the abdominal plate mounting portion is close to the contour line of the abdominal plate. Characteristic gas meter belly plate mounting structure.

  [2] The gas meter belly plate mounting structure according to the above item 1, wherein a meat stealing recess opened forward is formed in the belly plate mounting portion.

[3] On the outer peripheral edge of the concave portion for the measuring chamber provided on the front surface, a belly plate mounting portion that protrudes forward is formed, and the concave portion for the measuring chamber is covered from the front side including the belly plate mounting portion. A gas meter case body to which a belly plate can be attached,
The gas meter is characterized in that the abdominal plate mounting portion is formed so that the entire circumference of the outer contour line of the abdominal plate mounting portion is close to the contour line of the abdominal plate when viewed from the front. Case body.

  According to the gas meter belly plate mounting structure of the invention [1], the outer contour line of the belly plate mounting part of the case body is arranged so as to be close to the contour line of the belly plate over the entire circumference. It is possible to prevent a gap from being formed between the abdominal plate and the case main body on the back side of the outer peripheral edge. For this reason, when performing surface treatment of the gas meter by shot blasting, it is possible to prevent the shot ball from entering the back side of the outer peripheral edge of the abdomen, eliminating the need to remove the shot ball and checking the gas meter accordingly. Work and repair work can be performed easily.

  According to the gas meter belly plate mounting structure of the invention [2], since the meat stealing recess is formed in the belly plate mounting part, it is possible to remove excess material (bare meat) and to reduce the material used and cost. In addition, the weight of the case body can be reduced.

  According to the gas meter case body of the invention [3], similar effects can be obtained in the same manner as described above.

FIG. 1 is a front view showing a case body of a gas meter to which an abdominal plate mounting structure according to an embodiment of the present invention can be applied. FIG. 2 is an exploded perspective view for explaining the abdominal plate mounting structure of the embodiment. FIG. 3 is a cross-sectional view showing the abdominal plate mounting structure of the embodiment, and is a cross-sectional view corresponding to the cross section taken along the line BB of FIG. 4A and 4B show a metering membrane applied to the gas meter of the embodiment. FIG. 4A is a front view and FIG. 4B is a side view. FIG. 5 is a front view showing a case body of a conventional gas meter. 6 is a cross-sectional view showing a conventional abdominal plate mounting structure, and is a cross-sectional view corresponding to a cross section taken along line AA of FIG.

  FIG. 1 is a front view showing a case body 1 of a gas meter to which an abdominal plate attachment structure according to an embodiment of the present invention is applicable, FIG. 2 is an exploded perspective view for explaining the abdominal plate attachment structure of the embodiment, and FIG. It is sectional drawing equivalent to the BB line cross section of FIG.

  In FIG. 1, for easy understanding of the invention, the outline 4L of the abdomen 4 to be attached to the case body 1 is indicated by an imaginary line (two-dot chain line).

  Further, in the gas metering portion of the case main body 1 in the gas meter of the present embodiment, the configuration of the front half has a plane symmetry with respect to the configuration of the rear half and substantially the same configuration. Therefore, in the description of the present embodiment, the configuration of the front half will be described in detail, and only the main part of the configuration of the rear half will be described as necessary. Furthermore, in the present invention, as described above, the weighing portion of the case body 1 is symmetrical in shape, so that the “front surface” of the case body 1 can be replaced with the “rear surface” of the case body 1. It is also possible to replace the “front surface” of the case body 1 with the “front surface and rear surface” of the case body 1.

  As shown in FIGS. 1-3, the case main body 1 is comprised by the casting (casting) formed by the casting process, and the front surface of the case main body 1 is comprised as a measurement chamber by the gas meter assembly state. A measuring chamber recess 15 is formed. Further, an intake / exhaust port 2 which is one end opening of the intake / exhaust passage is opened at the upper right of the measurement chamber recess 15 on the front surface of the case body 1.

  An abdominal plate mounting portion 5 is formed on the outer peripheral edge of the weighing chamber recess 15 and the outer peripheral edge of the intake / exhaust port 2 on the front surface of the case body 1. The abdominal plate mounting portion 5 is formed integrally with the case body 1 so as to rise forward. In the present embodiment, a portion of the abdominal plate mounting portion 5 that is disposed along the outer peripheral edge of the measurement chamber recess 15 is referred to as a measurement chamber side abdominal plate mounting portion 51, and the outer peripheral edge of the intake / exhaust port 2. A portion arranged along the portion is referred to as an intake / exhaust port side abdomen attachment portion 52.

  A measuring chamber outer circumferential groove 51a is formed along the circumferential direction on the front surface of the measuring chamber side belly plate mounting portion 51, and intake and exhaust air along the circumferential direction is formed on the front surface of the intake / exhaust port side belly plate mounting portion 52. A mouth outer peripheral groove 52a is formed.

  Further, a plurality of screwing portions 55 are formed at appropriate intervals in the circumferential direction outside the outer peripheral grooves 51a and 52a on the front surface of the abdominal plate attachment portion 5. Each screwing portion 55 is formed with a threaded hole 56 into which a female screw is cut.

  In the present embodiment, the screwing portion 55 of the abdominal plate attachment portion 5 is not shaped to partially protrude outward as in the conventional gas meter of FIG. 5 described above, and includes the screwing portion 55. The entire circumference of the outer contour line 5L of the abdominal plate mounting portion 5 is formed in a smooth shape. In other words, in this embodiment, the region between the screwing portions 55 and 55 adjacent to each other in the abdominal plate attachment portion 5 has a shape that is built up on the outside as compared with the case main body of the conventional gas meter in FIG. Yes.

  As will be described in detail later, the outer contour line 5L of the abdominal plate mounting portion 5 in the present embodiment is formed following the contour line 4L of the abdominal plate 4 over the entire circumference.

  Moreover, in this embodiment, the meat steal which opens ahead in the part (part other than a screwing part) in which the screwing part 55 is not formed in the outer side of the measurement chamber outer periphery groove | channel 51a in the front side of the abdominal-plate attachment part 5 is carried out. A recess 57 is formed. Needless to say, the opening of the meat stealing recess 57 is blocked by the abdominal plate 4.

  FIG. 4 is a view showing the metering membrane 3. As shown in FIGS. 2 to 4, the measurement film 3 is arranged in the case body 1 so as to close the measurement chamber recess 15.

  The measuring membrane 3 projects outwardly to a disc-shaped membrane main body 35, a measuring chamber outer peripheral edge portion 31 formed along the outer peripheral edge portion of the membrane main body 35, and a portion in the circumferential direction of the measuring chamber outer peripheral edge portion 31. And an intake / exhaust port outer peripheral edge portion 32 formed along the outer peripheral edge portion of the intake / exhaust port 2. A measuring chamber outer peripheral seal member 31 a that corresponds to the measuring chamber outer peripheral groove 51 a of the case body 1 and functions as an O-ring is provided on the back surface side of the measuring chamber outer peripheral edge 31. Further, an intake / exhaust port outer peripheral seal member 32a corresponding to the intake / exhaust port outer peripheral groove 52a of the case body 1 and functioning as an O-ring is provided on the back side of the outer peripheral edge portion 32 of the intake / exhaust port.

  The sealing members 31 a and 32 a of the measurement membrane 3 are arranged corresponding to the outer peripheral grooves 51 a and 52 a of the case main body 1, and the outer peripheral edge portions 31 and 32 of the measurement membrane 3 are the belly plate attachment portions of the case main body 1. 5 is arranged.

  As shown in FIGS. 2 and 3, the abdomen 4 is formed in a shape that can cover almost the entire region of the region on the front side of the case body 1, and the abdomen of the case body 1 is formed on the outer peripheral edge thereof. An outer peripheral attachment portion 40 that corresponds to the attachment portion 5 and that can be placed on the abdominal plate attachment portion 5 is formed. Further, an outer edge portion 40 of the abdominal plate 4 is formed with an edge bent portion 45 (see FIG. 3) by bending the outer portion thereof toward the back surface side.

  Further, screw insertion holes 46 are formed in the outer peripheral mounting portion 40 of the abdominal plate 4 so as to correspond to the respective thread cutting holes 56 of the case body 1.

  In the present embodiment, the contour line 4L of the abdominal plate 4 is formed so as to be close to the outer contour line 5L of the abdominal plate attachment portion 5 of the case body 1 as will be described in detail later.

  In the present embodiment, as shown in FIG. 2, the portion corresponding to the measuring chamber side belly plate mounting portion 51 of the case body 1 in the outer peripheral mounting portion 40 of the belly plate 4 is referred to as a measuring chamber side outer peripheral mounting portion 41. A portion corresponding to the intake / exhaust port side belly plate mounting portion 52 is referred to as an intake / exhaust port side outer peripheral mounting portion 47.

  The abdominal plate 4 covers the measurement chamber recess 15 and the intake / exhaust port 2 of the case main body 1 via the measurement membrane 3, and the outer peripheral mounting portion 40 of the belly plate 4 is connected to the abdominal plate mounting portion 5 of the case main body 1. In this state, a screw (not shown) inserted through the screw insertion hole 46 of the abdominal plate 4 is screwed into the threading hole 56 of the case body 1 and fixed. As a result, the abdominal plate 4 is fastened and fixed to the case main body 1, and the measuring membrane 3 is clamped and fixed to the case main body 1 and the abdominal plate 4 at the outer peripheral edge 31 of the measuring chamber and the outer peripheral edge 32 of the intake / exhaust port. Further, the measurement chamber outer peripheral seal member 31a and the intake / exhaust port outer peripheral seal member 32a of the measurement membrane 3 are press-fitted into the measurement chamber outer peripheral groove 51a and the intake / exhaust port outer peripheral groove 52a of the case body 1 in a compressed state. Airtightness around the outer peripheral edge portions 31 and 32 of the measuring film 3 between the plates 4 is ensured.

  In this abdominal plate attachment state, as shown in FIG. 1, in the front view state of the case main body 1 viewed from the front (front), the outline 4L of the abdominal plate 4 is the outer outline of the abdominal plate attachment portion 5 of the case main body 1. With respect to 5L, it arrange | positions slightly outside over the perimeter. In other words, almost no gap is formed between the inner peripheral surface of the edge bending portion 45 of the abdominal plate 4 and the outer contour line 5L of the abdominal plate attachment portion 5 of the case main body 1, and the abdominal plate attachment portion of the case main body 1 5 is arranged so that the entire circumference of the outer contour line 5L is close to the contour line 4L of the abdominal plate 4 inside the contour line 4L of the abdominal plate 4.

  In the present embodiment, the space portion surrounded by the measurement chamber recess 15 and the measurement membrane 3 of the case body 1 is configured as an inner measurement chamber, and the space surrounded by the measurement membrane 3 and the abdomen 4. The part is configured as an outer weighing chamber.

  In the gas meter of the present embodiment having the above configuration, the outer contour line 5L of the abdominal plate mounting portion 5 of the case body 1 is disposed so as to be close to the contour line 4L of the abdominal plate 4 over the entire circumference. On the back side of the outer peripheral edge of the belly plate 4, almost no gap is formed between the belly plate 4 and the case main body 1, and it is possible to prevent a gap from being formed therebetween. For this reason, even when the surface coating of the gas meter is peeled off by shot blasting when checking the gas meter after the expiration date (used), the blast (shot ball) remains on the back side of the outer peripheral edge of the abdominal plate 4 Intrusion can be prevented. Therefore, in the gas meter of this embodiment, there is no need for troublesome work such as removing shot balls that have entered and accumulated on the back side of the outer peripheral edge of the abdominal plate, and the inspection work and repair work of the gas meter are easily performed accordingly. be able to.

  Here, in the present embodiment, the distance S1 (see FIG. 3) between the contour line 4L of the abdominal plate 4 and the outer contour line 5L of the abdominal plate mounting portion 5 is 2.3 mm or less, more preferably 1.8 mm or less. In the case of 1.6 mm or less, it is defined that the outer contour line 5L of the abdominal plate mounting portion 5 is close to the contour line 4L of the abdominal plate 4 in the front view state. That is, when this interval S1 is too large, a large gap is formed on the back side of the outer peripheral edge of the abdomen, and shot balls may enter and accumulate in the gap, which is not preferable. For reference, in the conventional abdominal plate mounting structure shown in FIGS. 5 and 6, the widest portion of the interval between the abdominal plate contour line and the outer contour line of the abdominal plate mounting portion is set to about 7.8 mm. Has been.

  Moreover, in this embodiment, since the thickness of the edge bending part 45 of the abdominal plate 4 is 1.2 mm, when calculating from the space | interval S1 between the said outlines, the outer peripheral end surface ( The clearance S2 between the outer contour line 5L) and the outer contour line 5L) is set to 1.1 mm or less, more preferably 0.6 mm or less, and even more preferably 0.4 mm or less over the entire circumference.

  Moreover, in the gas meter of this embodiment, since the meat stealing recessed part 57 opened ahead is formed in parts other than the screwing part 55 of the abdominal-plate attachment part 5, it is abbreviate | omitting an excess material (vain). Thus, the material used and cost can be reduced, and the case body 1 can be reduced in weight, and the gas meter can be reduced in weight.

  Furthermore, since the opening of the meat stealing recess 57 is closed by the abdomen plate 4, it is possible to reliably prevent a problem that a shot ball due to shot blast enters the meat stealing recess 57.

  Moreover, in the abdominal plate attachment structure of this embodiment, compared with the conventional abdominal plate attachment structure, it can form by only building up the outer peripheral edge of the abdominal plate attachment part 5 of the case main body 1 outside. That is, the abdominal plate mounting structure of the present embodiment can be easily realized without performing a large-scale design change or the like.

  In the present embodiment, as described above, two pairs of inner and outer measuring chambers are provided at the front of the case body 1, and two pairs of inner and outer measuring chambers are provided at the rear as well as the front. A total of four weighing chambers are provided side by side. Further, an upper case is attached to the case body 1 so as to cover the upper part thereof. The upper case is partitioned into an inflow chamber and an outflow chamber, and a gas inflow port is formed corresponding to the inflow chamber and a gas outflow port is formed corresponding to the outflow chamber. And the gas introduced from the outside of the meter into the inflow chamber of the upper case through the gas inlet is sequentially introduced into each measuring chamber and sequentially weighed, and then introduced into the outflow chamber of the upper case, and the gas is further introduced. The gas is discharged outside the meter through the gas outlet.

  By the way, in the said embodiment, although the case where the abdominal plate attachment structure of this invention was applied to the front side of the case main body was mentioned as an example and demonstrated, it is not restricted to it, The abdominal plate attachment structure of this invention is the case main body. The same can be applied to the rear side as well. Furthermore, the abdominal plate attachment structure of the present invention may be employed on both the front side and the rear side of the case body, or may be employed on only one of them.

  In the present invention, the shape, the number of formations, and the formation positions of the meat stealing recesses are not particularly limited.

  The abdominal plate mounting structure of the gas meter of the present invention can be suitably employed for a mechanical type gas meter that operates by gas pressure.

1: Case body 15: Measuring chamber recess 4: Abdominal plate 40: Outer peripheral attachment portion 4L: Contour line 5: Abdominal plate attachment portion 5L: Outer contour line 55: Screwing portion 57: Meat stealing portion

Claims (3)

A case main body provided with a concave portion for the measurement chamber is provided on the front surface, and an abdominal plate mounting portion that protrudes forward is formed on the outer peripheral edge of the concave portion for the measurement chamber in the case main body. A gastric belly plate mounting structure to which a belly plate is mounted so as to cover the concave portion for the measurement chamber from the front side,
In the front view when the case body is viewed from the front, the abdominal plate mounting portion is formed so that the entire circumference of the outer contour line of the abdominal plate mounting portion is close to the contour line of the abdominal plate. Characteristic gas meter belly plate mounting structure.   The gas meter belly plate mounting structure according to claim 1, wherein a meat stealing recess opened forward is formed in the belly plate mounting portion. A belly plate mounting portion that protrudes forward is formed at the outer peripheral edge portion of the concave portion for the measurement chamber provided on the front surface, and the belly plate so as to cover the concave portion for the measurement chamber including the belly plate mounting portion from the front side. Is a gas meter case body that can be attached,
The gas meter is characterized in that the abdominal plate mounting portion is formed so that the entire circumference of the outer contour line of the abdominal plate mounting portion is close to the contour line of the abdominal plate when viewed from the front. Case body.

Images