JP2010025702A - Diaphragm gas meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diaphragm gas meter which prevents degradation of sealing of the outer peripheral edge of a case body and a web plate, allowing a measurement space to have an airtight structure, and improves workability during repair. <P>SOLUTION: The diaphragm gas meter divides the measurement space formed between the case main unit 17 and the web plate 18 into two parts by a measurement diaphragm 19 and reciprocates the measurement diaphragm 19 through the pressure of inflow gas to measure the flow of the gas. The diaphragm gas meter is provided with gripping parts 17a, 18a for gripping an outer peripheral edge 20a of a web plate gasket 20 in the outer peripheral edge of the case main unit 17 and the web plate 18. A cap screw 21 is integrally provided in the gripping part 17a of the case main unit 17. A mounting hole 22 facing the cap screw 21 is provided in the web plate 18. A fixing screw 24 is inserted into the mounting hole 22 from the web plate 18 side, and is passed through an insertion hole 23 of the web plate gasket 20 to be fastened tightly into the cap screw 21, thereby gripping the web plate gasket 20 between the case main unit 17 and the web plate 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a membrane gas meter used for measuring household gas consumption.

  The measuring box of the membrane gas meter for instructing the amount of gas used is composed of a case main body and a stomach plate, and two measuring spaces are formed in the measuring box. Each metering space is partitioned into first and second metering chambers by a metering membrane, and communicates with a gas inlet and a gas outlet through a gas channel, respectively.

  The measurement membrane is movable in the front-rear direction within each measurement space, and a rotating blade is rotatably connected to the central portion thereof. The rotating blade is fixed to a rotating shaft in the case main body, and converts the movement of the measurement film into the rotation of the rotating shaft.

  A valve body for opening and closing the gas flow path is connected to the rotating shaft via a crank mechanism. This valve body is linked to the crank mechanism, and allows the metering chamber to communicate with either the gas inlet or the gas outlet or to shut off from both the inlet and the gas outlet.

  If gas is used when the first metering chamber and the gas inlet are in communication, the gas flows into the first metering chamber, and the metering membrane moves toward the second metering chamber due to the pressure of the gas. Thereby, the gas in the second measuring chamber flows out from the gas outlet through the gas flow path. Then, the movement of the measuring film is converted into a rotating motion of the rotating blade and transmitted to the valve body through the rotating shaft and the crank mechanism. Thereby, the opening and closing of the gas flow path is switched.

  When gas flows into the second measuring chamber by switching the gas flow path, the measuring membrane moves toward the first measuring chamber due to the pressure of the gas. Thereby, the gas in the second measuring chamber flows out from the gas outlet through the gas flow path. Then, the movement of the measuring film is converted into a rotating motion of the rotating blade and transmitted to the valve body through the rotating shaft and the crank mechanism. Thereby, the opening and closing of the gas flow path is switched.

  Therefore, when the above operation is repeated while the gas is used, and the number of reciprocations of the metering membrane is counted by a counter, the flow rate of the gas that has passed through the metering space, that is, the amount of gas used can be measured (see Patent Document 1). .

  By the way, the membrane gas meter including the patent document 1 is configured as shown in FIGS. That is, in the measuring chamber 1 of the membrane gas meter, the measuring space 4 formed between the case body 2 and the abdomen 3 is divided into two by the measuring membrane 5. The metering membrane 5 is reciprocated by the pressure of the gas flowing in to measure the gas flow rate. Therefore, the measurement space 4 needs to be configured in an airtight structure, and sandwiching portions 2 a and 3 a that sandwich the outer peripheral edge portion 6 a of the belly plate gasket 6 are provided on the outer peripheral edge portions of the case body 2 and the belly plate 3.

Further, a plurality of through screw holes 7 are provided in the sandwiching portion 2 a of the case body 2, and a mounting hole 8 that is opposed to the through screw holes 7 is provided in the stomach plate 3. Then, the fixing screw 8 is inserted into the mounting hole 9 from the side of the abdominal plate 3, penetrates the abdominal plate gasket 6 and is tightened to the through screw hole 7, and the abdominal plate gasket 6 is sandwiched between the case body 2 and the abdominal plate 3. ing.
JP 2006-177805 A

  However, since the screw hole provided in the clamping part 2a of the case body 2 is the through screw hole 7, it is difficult for the paint to enter the inside of the screw hole, and rainwater enters from the rear of the through screw hole 7, and the screw hole Since the gasket in the peripheral portion is likely to deteriorate, rainwater may enter the measurement space 4 from the through screw hole 7. Furthermore, the through screw hole 7 and the fixing screw 9 are corroded and difficult to disassemble, and unintended repair items such as thread breakage may increase.

  The present invention has been made paying attention to the above circumstances, and its purpose is to prevent deterioration of the seal in the outer peripheral edge of the case main body and the abdominal plate which make the measurement space an airtight structure, and improve workability at the time of repair. The object is to provide a membrane gas meter that can be improved.

  In order to solve the problems and achieve the object, claim 1 divides a measuring space formed between the case main body and the abdominal plate into two by a measuring membrane, and reciprocates the measuring membrane by the pressure of the inflowing gas. In the membrane gas meter for measuring the flow rate of the gas by moving, a holding portion for holding the outer peripheral edge portion of the belly plate gasket is provided at the outer peripheral edge portion of the case main body and the belly plate, and the holding portion of the case main body is provided with A bag screw part is provided integrally, a mounting hole facing the bag screw part is provided in the belly plate, a fixing screw is inserted into the mounting hole from the belly plate side, and the bag screw passes through the belly plate gasket. The belly plate gasket is clamped between the case main body and the belly plate by being tightened to a portion.

  According to the present invention, the cap screw part is integrally provided in the sandwiching part of the case body, and by preventing rainwater from entering the screw hole, the deterioration of the seal part around the screw hole can be prevented, thereby improving the reliability. As well as being effective, it is possible to improve workability during repair.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a front view showing a membrane gas meter according to the first embodiment, FIG. 2 (a) is a sectional view taken along the line AA in FIG. 1, and FIG. 2 (b) is an enlarged sectional view of a portion B. It is.

  As shown in FIGS. 1 and 2, the membrane gas meter includes an upper case 11 and a lower case 12. A gas inlet 13 and a gas outlet 14 are provided at the upper part of the upper case 11, and a counter 15 for displaying the integrated flow rate is provided at the front.

  The lower case 12 has two measuring spaces 16 arranged in front and rear. These measuring spaces 16 are composed of a case main body 17 and an abdominal plate 18, and a measuring film 19 for partitioning each measuring space 16 into a first measuring chamber 16a and a second measuring chamber 16b reciprocates in the front-rear direction. It is provided freely.

  Clamping portions 17 a and 18 a that sandwich the outer peripheral edge portion 20 a of the abdominal plate gasket 20 are provided on the outer peripheral edge portions of the case body 17 and the abdominal plate 18. A cap screw portion 21 is provided at the peripheral portion of the holding portion 17a of the case body 17 integrally at substantially equal intervals. That is, the bag screw portion 21 has a screw hole that opens from the clamping portion 17a, and the back portion of the screw hole is covered with the bag portion 21a.

  Further, the abdomen 18 is provided with a mounting hole 22 that opposes the opening of the cap screw 21. An insertion hole 23 is also formed in the outer peripheral edge portion 20 a of the abdominal plate gasket 20 interposed in the outer peripheral edge portion of the case body 17 and the abdominal plate 18 so as to face the attachment hole 22. A fixing screw 24 is inserted into the mounting hole 22 from the side of the abdomen plate 18, and further passed through the insertion hole 23 of the abdomen plate gasket 20 and fastened to the bag screw portion 21. That is, it is fastened and fixed by the fixing screw 24 with the belly plate gasket 20 being sandwiched between the case body 17 and the belly plate 18.

  The abdominal plate gasket 20 has an outer peripheral edge portion 20a formed in a seal portion sandwiched between the case main body 17 and the abdominal plate 18 to ensure the measurement space 16 in an airtight manner. Further, the bag screw portion 21 to which the fixing screw 24 is tightened has a shape in which the inner portion of the screw hole is covered with the bag portion 21a, and it is possible to prevent rainwater and foreign matter from entering and prevent deterioration of the seal portion. In addition, corrosion of the fixing screw 24 can be prevented, and no thread breakage or the like occurs at the time of repair, so that workability of repair can be prevented.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The front view which shows the 1st Embodiment of this invention and shows a membrane type gas meter. Sectional drawing which shows the same embodiment, (a) cut | disconnects and shows a membrane gas meter along the AA line in FIG. 1, (b) is sectional drawing to which the B section was expanded. The conventional film | membrane type gas meter is shown, (a) is sectional drawing cut | disconnected and shown along the AA line of FIG. 1, (b) is sectional drawing to which the C section was expanded.

Explanation of symbols

17 ... case body, 18 ... abdominal plate, 19 ... measuring membrane, 20 ... abdominal plate gasket, 21 ... bag screw portion, 22 ... mounting hole, 24 ... fixing screw

Claims (1)

In a membrane gas meter for measuring a flow rate of the gas by dividing a measurement space formed between the case body and the abdomen into two by a measurement membrane and reciprocating the measurement membrane by the pressure of the gas flowing in,
Provided with a sandwiching portion for sandwiching the outer peripheral edge of the belly plate gasket on the outer peripheral edge of the case body and the belly plate,
An integral bag screw portion is provided in the sandwiching portion of the case body, and an attachment hole facing the bag screw portion is provided in the belly plate,
A fixing screw is inserted into the mounting hole from the abdomen plate side, penetrated through the abdomen plate gasket, and tightened to the bag screw part to sandwich the abdomen plate gasket between the case body and the abdomen plate. Features a membrane gas meter.

Images