JP6457196B2 - Membrane gas meter - Google Patents

Description

  In the present invention, a metering chamber is formed in a lower case of a gas meter main body composed of a die-cast body, and an upper side is formed with an inlet side base and an outlet side base on the upper case. The present invention relates to a so-called membrane gas meter in which a shut-off valve for shutting off a gas flow (metering) is installed in a gas inflow path, and more specifically, in the gas inflow path formed between the inlet side cap and the shutoff valve. The present invention relates to a membrane gas meter that can reduce flow resistance (pressure loss) as much as possible.

  In the case of the conventional membrane gas meter, since the miniaturization is demanded as the request, the corner portion connecting the vertical flow path formed in the upper case from the inlet base toward the vertical direction and the shut-off valve mounting flow path is It is formed at a right angle.

  In addition, the lower case and upper case of the membrane gas meter are die-cast, so that the gas inflow channel is a pulling die that pulls out in the direction of the inlet base, and the channel that attaches the shutoff valve is in the front direction in the upper case. A punching die is used.

  In this way, when the gas inflow path is formed by the conventional method, the lightening direction is performed in the vertical direction and the horizontal direction, so the flow path at the corner portion is a right angle where the vertical direction and the horizontal direction intersect, and Since it does not exceed the path diameter, there is a problem that the pressure loss inevitably increases.

  Incidentally, the channel diameter of the membrane gas meter which is the subject of the present invention has a right-angled corner portion as seen in Japanese Patent Application Laid-Open No. 2011-169826.

JP 2011-169826 A

  An object of the present invention is to provide a membrane gas meter having a gas inflow path shape that reduces pressure loss as much as possible in an inlet-side flow path from an inlet-side base to a shut-off valve.

In order to achieve the above object, according to the first aspect of the present invention, in the membrane gas meter, a pair of metering membranes are assembled in the metering chamber formed in the lower stage of the gas meter body, and flow into the metering chamber in the upper stage of the gas meter body. In a membrane gas meter in which an inflow path of gas and a gas shut-off valve that operates in an emergency are assembled in the inflow path, from a gas inlet gold formed on the top surface of the upper case covering the upper stage of the gas meter body As soon as it enters, a gas inflow space having a square shape in front view is formed, a shut-off valve mounting port for mounting the shut-off valve is formed on the front wall of the inflow space, and a rear wall facing the shut-off valve mounting port A valve seat is formed, and the bottom of the inflow space is opened downward, and an inner lid is attached to the opening.

  In the above-described membrane gas meter, the present invention provides that the gas flowing in from the inlet side cap immediately enters the gas inflow space, there is no corner between the gas reaching the shutoff valve, and the gas filled in the space passes directly through the shutoff valve. To the weighing chamber side.

  As a result, since the gas is once depressurized in the inflow space, the flow resistance (pressure loss) of the gas can be greatly reduced as compared with the flow path shape having a right-angled corner.

Illustration of membrane gas meter A-A 'sectional view Illustration of gas inflow space Illustration of shut-off valve installation Explanatory drawing of the installation state of space and shut-off valve Explanatory drawing of the gas inflow space of Example 2 Explanatory drawing of the attachment state of the shut-off valve of Example 2 Explanatory drawing of planar view L-shaped space of Example 2 Illustration of punching die

  Embodiment 1 of the present invention will be described in detail with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a gas meter main body. The gas meter main body 1 has a measuring chamber formed therein, a lower case 2 in which a pair of measuring films are assembled in the measuring chamber, a machine chamber, a measuring circuit, and the like. The upper case 3 is assembled.

  Reference numeral 6 denotes a gas inflow space having a quadrangular cross section formed below the inlet side cap 4, and a mounting port 10 for the shutoff valve 9 is formed directly on the front side of the inflow space 6. A valve seat 12 to which the valve 11 of the shut-off valve 9 is in close contact is formed at a portion opposed to the opening 6 and the bottom surface 6a of the inflow space 6 is opened. An inner lid 13 is attached to the opening 6a with screws 13a. Yes.

  Reference numeral 14 denotes a reset button of the shut-off valve 9. In the case of the present embodiment as in the above configuration, the gas flowing directly into the gas inflow space 6 from the inlet side cap 4 is filled in the space 6 and then flows out from the valve seat 12 to the measuring chamber side. Therefore, almost no pressure loss occurs.

In the second embodiment, as shown in FIGS. 6 to 8, the gas inflow space formed under the inlet base 4 is formed in an L shape in plan view, and a shut-off valve 9 is attached to the L-shaped space 6b. The bottom of the L-shaped space 6b is opened in the same manner as in the first embodiment, and the inner lid 13 is attached to the opening 6a with screws 13a.
The basic effect of the second embodiment is the same as that of the first embodiment except that the shape of the L-shaped space 6b is different from that of the first embodiment.

  In the second embodiment, a circular curved surface 18 is formed at the corner 17 portion of the L-shaped space 6b to make the flow smooth as shown in FIG.

  In the gas meters of Examples 1 and 2 described above, the gas flowing in from the inlet side cap 4 once enters the wide space 6 and then reaches the measuring chamber side from the shutoff valve 9 via the valve seat 12.

  As a result, the gas pressure loss can be greatly reduced as compared with the conventional case.

  FIG. 9 is an explanatory diagram of a die for forming a space 6 that serves as a gas inflow path in the first embodiment. A is a die for the inlet side cap 4 portion, B is a die for the space 6, It is a punching die for the shut-off valve mounting port 10 and the valve seat 12.

DESCRIPTION OF SYMBOLS 1 Gas meter 2 Lower case 3 Upper case 4 Inlet side cap 5 Outlet side cap 6 Gas inflow space 6a Opening port 6b L-shaped space 7 Gas outflow passage 9 Shut-off valve 10 Mounting port 11 Valve 12 Valve seat 13 Inner lid 13a Screw 14 Reset button

Claims (1)

A pair of metering membranes are assembled in a metering chamber formed in the lower part of the gas meter body, and an inlet side inflow path of gas flowing into the metering chamber in the upper stage of the gas meter body and a gas shut-off valve that operates in an emergency in the inflow path In the membrane gas meter assembled with the gas meter, a rectangular gas inflow space is formed immediately after entering from the gas inlet gold formed on the top surface of the upper case that covers the upper stage of the gas meter main body. A shut-off valve mounting port for mounting the shut-off valve is formed on the front wall of the space, a valve seat is formed on the rear wall facing the shut-off valve mounting port, and the bottom of the inflow space is opened downward. A membrane gas meter with an inner lid attached to the opening.

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