JP2010071784A - Metering film structure of film type gas meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metering film structure of a film type gas meter that prevents misalignment of attachment positions of a metering film and a film plate for causing reduction in metering accuracy of a flow rate, and certainly can block movement of fluid on the front and rear sides of the metering film without applying a sealing agent or arranging a packing member. <P>SOLUTION: This metering film 1 has a central plane section 3 for attaching film plates 2a and 2b, and the central plane section 3 has engaging columns 4a and 4b. In the film plates 2a and 2b, through-holes 5a and 5b of the same shape as the outer shape of the engaging columns 4a and 4b are disposed at positions corresponding to the engaging columns 4a and 4b. The film plates 2a and 2b are attached to the metering film 1 in a state where the engaging columns 4a and 4b are inserted into through-holes 5a and 5b. The tips of the engaging columns 4a and 4b have tip sections 6a and 6b larger than the shape of the through-holes 5a and 5b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a measuring membrane structure in a membrane gas meter that measures a flow rate by reciprocating a measuring membrane in a measuring chamber.

  The membrane gas meter has a measuring membrane for partitioning the measuring chamber in the measuring chamber, and the measuring membrane is reciprocated by the inflow of the fluid to be measured, and the reciprocating motion is detected by the detection mechanism. Measure the flow rate. Conventionally, there is a structure as shown in FIG.

  The metering membrane 31 is formed into a truncated cone shape as indicated by the central plane portion 33 and the oblique side portion 38, and the central plane portion 33 has two membrane plates 32a, 32b. One of the membrane plates 32a and 32b (here illustrated by the membrane plate 32a) is provided with a hinge-shaped projection 37 for transmitting the reciprocating motion of the measurement membrane 31 to the interlocking mechanism that is a part of the detection mechanism. ing. Further, a through hole 35 is provided at a common position in the center of the measurement film 31 and the film plates 32a and 32b. By passing the screw 34 through the through hole 35 and tightening the two membrane plates 32a and 32b arranged on both sides of the measurement membrane 31 with the screw 34, the measurement membrane 31 is sandwiched between the membrane plates 32a and 32b. The mounting position of 31 and the membrane plates 32a and 32b is regulated.

  In addition, the measurement membrane 31 needs to reliably block the movement of fluid on the front and back of the measurement membrane 31 in order to ensure measurement accuracy in a minute flow rate region. In order to block the fluid movement in the through hole 35 provided in the center of the measurement membrane 31 and the membrane plates 32a and 32b for tightening with the screw 34, is a sealing agent 39 applied to the position where the screw 34 is provided? Alternatively, a packing member such as an O-ring 40 is provided.

In Patent Document 1, a measuring chamber is provided so as to be divided into a first measuring chamber and a second measuring chamber, and is reciprocated by fluid alternately introduced into the first measuring chamber and the second measuring chamber. And the other membrane plate, which stabilizes the reciprocation of the same membrane, and sandwiches each of these membrane plates and the central portion of the capsule. A metering membrane structure of a membrane gas meter having a coupling means for coupling in a compressed manner is disclosed. In this metering membrane structure, one and the other membrane plates are fixed by sandwiching the membrane at the central bulge portion that bulges at the center, and against the membrane at the guide portion outside these central bulges Thus, the same film is guided while leaving a predetermined gap.
Japanese Patent No. 3104497

  However, in the measurement membrane structure described with reference to FIG. 6, the measurement membrane and the membrane plate are fixed only by the force by which the membrane plate by screwing in the central portion sandwiches the measurement membrane. When the membrane is pulled in the radial direction and the mounting position of the measurement membrane and the membrane plate is shifted, the measurement membrane may be wrinkled. This wrinkle makes the shape of the metering membrane unstable when the metering membrane is operated, and causes a decrease in metering accuracy in the membrane gas meter.

  Further, in the measuring membrane structure described in FIG. 6 and the measuring membrane structure described in Patent Document 1, a screw for fixing the membrane plates attached to both sides of the measuring membrane is passed through, so that a through hole is formed at the center of the measuring membrane. In order to reliably block the movement of fluid from the through hole, it is necessary to apply a sealant or dispose a packing member such as an O-ring at the screw portion.

  The present invention has been made in view of the above-described circumstances, and prevents displacement of the mounting position of the metering membrane and the membrane plate, which causes a reduction in the flow rate metering accuracy, and also applies a sealing agent or a packing member. It is an object of the present invention to provide a metering membrane structure of a membrane gas meter that can reliably block the movement of fluid on the front and back sides of the metering membrane without arranging the above.

  In order to solve the above-mentioned problem, the first technical means of the present invention is a metering membrane structure in a membrane gas meter having a metering chamber, wherein the metering chamber is partitioned and a reciprocating motion is caused by fluid alternately flowing into the metering chamber. A measuring membrane to be performed and two membrane plates provided so as to sandwich the measuring membrane to stabilize the shape of the measuring membrane, and the measuring membrane has a central flat part for attaching the membrane plate. The center plane portion has a fitting column, and the membrane plate is provided with a through-hole having the same shape as the outer shape of the fitting column at a position corresponding to the fitting column, and the fitting is inserted into the through-hole. The fitting column is attached to the measuring membrane, and the tip of the fitting column has a tip portion larger than the shape of the through hole.

  According to a second technical means, in the first technical means, the tip portion is attached after the fitting column is inserted into the through hole.

  According to a third technical means, in the first technical means, the tip has a size larger than the shape of the through hole and can be pushed into the through hole. The membrane plate is attached to the measurement membrane by pushing the fitting column into the hole.

  According to the metering membrane structure of the membrane gas meter according to the present invention, the displacement of the mounting position of the metering membrane and the membrane plate, which causes a reduction in the flow rate metering accuracy, is prevented, and the sealing agent is applied or the packing member is disposed. It is possible to reliably block the movement of the fluid on the front and back of the measurement membrane without performing the above.

  FIG. 1 is a perspective view showing an example of a metering membrane structure in a membrane gas meter according to the present invention. FIG. 2 is a cross-sectional view showing an example of a metering membrane structure in a membrane gas meter according to the present invention, and is a cross-sectional view showing a structure in which membrane plates are attached to both sides of the metering membrane of FIG. FIG. 3 is an enlarged view of a fitting column portion in the measurement membrane structure of FIG.

  The metering membrane 1 of the membrane gas meter is installed so as to partition the metering chamber of the membrane gas meter body. And the measurement film | membrane 1 reciprocates with the fluid which flows alternately into a measurement chamber, This reciprocation is transmitted to an interlocking mechanism, and a flow volume is measured.

  The measuring membrane 1 is formed into a truncated cone shape by bonding a synthetic rubber to a polyester base fabric, for example. The measuring film 1 can be smoothly reciprocated because its hypotenuse 8 is bendable. In addition, in order to reliably transmit the reciprocating motion of the measuring membrane 1 to the interlocking mechanism, it is necessary to stabilize the shape of the measuring membrane 1 during the reciprocating motion, and therefore the measuring membrane 1 is provided with two membrane plates 2a and 2b. The center plane portion 3 is provided with two membrane plates 2a and 2b so as to be sandwiched from both sides. One of the membrane plates 2a and 2b (illustrated by the membrane plate 2a in FIG. 2) is provided with a hinge-shaped projection 7 for transmitting the reciprocating motion of the measuring membrane 1 to the interlocking mechanism of the gas meter. In addition, the hinge-shaped projection part 7 is abbreviate | omitted in FIG.

  In the metering membrane structure of the membrane gas meter configured as described above, in the present invention, the fitting columns 4a and 4b molded integrally with the metering membrane 1 from the central planar portion 3 of the metering membrane 1 3. A plurality of bulges are formed along the outer periphery. In the example of FIGS. 1 and 2, an example is shown in which four fitting columns 4 a and four fitting columns 4 b are formed so as to rise. An example in which the fitting columns 4a and 4b are raised from the central plane portion 3 will be described. However, the fitting columns 4a and 4b may be provided on both surfaces of the central plane portion 3 of the measuring film 1, respectively. Further, the fitting columns 4a and 4b do not need to be formed integrally with the measuring film 1, and may be attached to the central plane portion 3 by adhesion or the like.

  The membrane plates 2a and 2b are provided with through holes 5a and 5b at positions corresponding to the fitting columns 4a and 4b, respectively. The through holes 5a and 5b have the same shape as the outer shape of the fitting columns 4a and 4b. The membrane plates 2a and 2b may be molded from resin, and the through holes 5a and 5b may be formed at the time of molding or may be formed later.

  In the central plane portion 3, the membrane plates 2a and 2b are arranged so as to sandwich the measuring membrane 1, with the fitting columns 4a and 4b inserted (fitted) into the through holes 5a and 5b, respectively. The membrane plates 2 a and 2 b are attached to the central flat portion 3 of the measuring membrane 1. Thus, by providing the fitting columns 4a and 4b and the through holes 5a and 5b for inserting the fitting columns 4a and 4b, it is possible to regulate the mounting positions of the measurement film 1 and the two film plates 2a and 2b.

  Since the measurement membrane 1 and the membrane plates 2a and 2b are fixed by such attachment, the attachment positions of the measurement membrane 1 and the membrane plates 2a and 2b remain regulated, for example, measurement is performed by vibration during transportation of the meter. It is possible to prevent such a situation that the membrane 1 is pulled and the mounting position of the measurement membrane 1 and the membrane plates 2a and 2b is shifted.

  Further, in the present invention, the tip end (head) larger than the shape of the through holes 5a, 5b (the diameter of the through holes 5a, 5b when the through holes 5a, 5b are circular) at the tips of the fitting columns 4a, 4b. ) 6a, 6b. For example, the tip portions 6a and 6b may be provided at the tips of the fitting columns 4a and 4b in a tapered shape such as an umbrella shape or a hemispherical shape.

  The tip portions 6a and 6b may be attached by bonding or the like after the fitting columns 4a and 4b are inserted into the through holes 5a and 5b. As an alternative, the tip portions 6a and 6b are attached to the fitting columns 4a and 4b by bonding or the like so as to have a size larger than the shape of the through holes 5a and 5b and capable of being pushed into the through holes 5a and 5b. May be. Then, the membrane plates 2a and 2b may be attached to the measuring membrane 1 by pushing the fitting columns 4a and 4b into the through holes 5a and 5b.

  By providing the tip portions 6a and 6b, the measuring film 1 and the film plates 2a and 2b can be fixed, and the film plates 2a and 2b from the measuring film 1 can be prevented from coming off (dropping off). Accordingly, the screw tightening at the center of the membrane plate as in the prior art is not required, and the through hole at the center of the metering membrane is not required, so that the movement of the fluid on the front and back sides of the metering membrane is reliably blocked. This eliminates the need for screws and reduces the number of parts used, and eliminates the need for applying a sealant or using a packing member for blocking the movement of fluid on the front and back of the measurement membrane as in the prior art.

  As described above, according to the present invention, the fitting positions of the metering membrane 1 and the membrane plates 2a and 2b are securely fixed by fitting the fitting columns 4a and 4b and the through holes 5a and 5b. It is possible to prevent a deviation between the measurement film 1 and the film plates 2a and 2b, which causes a decrease in accuracy.

  In addition, the material of the fitting columns 4a and 4b is not limited to the same material as the material of the measuring film 1, and the same effect can be obtained even when different materials are used. The shape of the measurement membrane 1 is not limited to the truncated cone shape, and may be other shapes such as a quadrangular shape, a polygonal shape, and a track shape. Further, the material of the membrane plates 2a and 2b is not limited to a resin molding member, and the same effect can be obtained with a metal.

  As described above, with reference to FIGS. 1 to 3, the fitting columns 4 a and 4 b and the through holes 5 a and 5 b are formed on the central plane portion 3 as a more preferable example for securely fixing the measuring membrane 1 and the membrane plates 2 a and 2 b. Although the example provided with two or more along the outer peripheral part of both surfaces was demonstrated, the arrangement | positioning is not restricted to this. Another arrangement will be described with reference to FIGS. FIG. 4 and FIG. 5 are diagrams showing other examples of the measuring film applicable to the measuring film structure according to the present invention.

  As illustrated in FIG. 4, even if one fitting column 14 (of course, a tip is provided) is provided at the center of both surfaces of the measurement film 11, and the through hole of the film plate is provided correspondingly, The same effect as the example in FIGS. 1 to 3 can be obtained. In order to obtain further effects, the example in FIG. 4 may be combined with the example in FIGS. 1 to 3 as illustrated in FIG. That is, by providing the center fitting column 14 and the plurality of fitting columns 24 along the outer peripheral portion on both surfaces of the measurement membrane 21, and providing the through holes of the membrane plate correspondingly, the measurement membrane and the membrane plate are further provided. Can be prevented from shifting.

It is a perspective view which shows an example of the measurement film | membrane structure in the film | membrane type gas meter based on this invention. It is sectional drawing which shows an example of the measurement film | membrane structure in the membrane-type gas meter based on this invention, and is sectional drawing which shows the structure which attached the film board to both surfaces of the measurement film | membrane of FIG. It is an enlarged view of the fitting pillar part in the measurement film | membrane structure of FIG. It is a figure which shows the other example of the measurement film | membrane applicable to the measurement film | membrane structure which concerns on this invention. It is a figure which shows the other example of the measurement film | membrane applicable to the measurement film | membrane structure which concerns on this invention. It is sectional drawing which shows the measurement film | membrane structure in the conventional film | membrane type gas meter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11,21 ... Metering membrane, 2a, 2b ... Membrane plate, 3 ... Center plane part, 4a, 4b ... Fitting pillar, 5a, 5b ... Through-hole, 6a, 6b ... Tip part, 7 ... Hinge-shaped protrusion Part, 8 ... oblique side part, 14, 24 ... fitting column.

Claims (3)

In the measurement membrane structure in a membrane gas meter having a measurement chamber,
A measuring membrane that partitions the measuring chamber and reciprocates by a fluid alternately flowing into the measuring chamber, and two membrane plates that are provided so as to sandwich the measuring membrane and stabilize the shape of the measuring membrane Prepared,
The metering membrane has a central plane portion for attaching the membrane plate, the central plane portion has a fitting column,
The membrane plate is provided with a through hole having the same shape as the outer shape of the fitting column at a position corresponding to the fitting column, and the membrane plate is attached to the measuring membrane with the fitting column inserted into the through hole. And
A metering membrane structure for a membrane gas meter, wherein a tip of the fitting column has a tip that is larger than the shape of the through hole.   The metering membrane structure of the membrane gas meter according to claim 1, wherein the tip portion is attached after the fitting column is inserted into the through hole.   The tip portion has a size that is larger than the shape of the through hole and can be pushed into the through hole, and the measurement membrane structure is configured to push the fitting column into the through hole, thereby The membrane membrane of a membrane gas meter according to claim 1, wherein the membrane plate is attached to the membrane gas meter.

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