JP2018205130A - Film-type gas meter - Google Patents

Abstract

To provide a film-type gas meter in which the internal diameter of the hole for attaching an isolation valve is increased so that pressure loss is reduced as much as possible in a gas inflow passage from an entrance-side ferrule.SOLUTION: In an inflow route on the gas entrance side and a gas isolation valve activated in the emergency in the inflow route, the internal diameter of a flange hole 11 for attaching an isolation valve is increased in such a manner that a packing groove 16a formed along the circumferential direction of the flange hole 11 and a packing groove 16b formed along the circumferential direction of a screw hole 12 for attaching an isolation valve are integrally and continuously formed so that a packing groove 16 is formed.SELECTED DRAWING: Figure 4

Description

In the present invention, a metering chamber is formed in a lower case of a gas meter body formed of a die-cast body, and an upper side is formed with an inlet side base and an outlet side base on the upper surface thereof, and further in the upper case, in an emergency situation. The present invention relates to a so-called membrane gas meter in which a shutoff 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 base and the shutoff valve. The present invention relates to a membrane gas meter that can reduce the flow resistance (pressure loss) of a gas as much as possible by enlarging the inner diameter of the mounting hole to increase the space volume.

In the case of a conventional membrane gas meter, as shown in FIG. 6, in front of the shut-off valve mounting space 103 formed so as to partially cover the lower end of the longitudinal channel 102 formed in the vertical direction from the gas inlet gold 101. A shut-off valve mounting flange hole 105 is formed in the wall 104.

A packing groove 106 is formed in the front wall 104 along the circumferential direction of the shut-off valve mounting flange hole 105, and a side wall 107 is erected from the inner edge of the packing groove 106 and the packing groove 106. A packing 108 made of an O-ring is fitted into the.

The front wall 104 is formed with a shut-off valve mounting screw hole 109 around the packing groove 106, and the shut-off valve is tightened into the screw hole 109 and through the shut-off valve flange 110. Attached to the front wall 104.

Thus, since the conventional shut-off valve mounting hole uses a packing made of an O-ring, the shape of the packing groove formed around the hole is limited, and up to the position related to the shut-off valve mounting screw hole. Since the packing groove could not be formed, there was a problem that the inner diameter could not be enlarged for the purpose of reducing the gas flow resistance.

Further, since the packing made of the O-ring has a small frictional resistance against the inside of the packing groove due to its shape, there is a problem that it is easily displaced from the packing groove after fitting.

An object of the present invention is to provide a membrane gas meter in which the inner diameter of the shut-off valve mounting hole is enlarged in order to reduce pressure loss as much as possible in the gas inflow path from the inlet side cap.

In order to achieve the above-mentioned object, the invention described in claim 1 is to assemble a pair of measurement membranes in a measurement chamber formed in the lower case of the gas meter main body and to control the gas flowing into the measurement chamber formed in the upper case of the gas meter main body. In a membrane gas meter in which an inflow path on the inlet side and a gas shut-off valve that operates in an emergency are assembled in the inflow path, a vertical flow formed in a vertical direction from a gas inlet gold formed on the upper surface of the upper case A shut-off valve mounting space is formed so as to partially cover the lower end of the passage, and a shut-off valve mounting flange hole is formed on the front wall of the shut-off valve mounting space, and the shut-off valve mounting space facing the shut-off valve mounting hole is formed. A valve seat is formed on the rear wall, and a packing groove is formed in the front wall of the shut-off valve mounting space along the circumferential direction of the shut-off valve mounting flange hole. A seal groove that is continuously formed integrally with the seal groove recessed along the circumferential direction of the screw hole for mounting the shut-off valve formed around the flange hole for use, and having an elastic packing in the seal groove A portion related to the packing groove recessed along the circumferential direction of the shut-off valve mounting screw hole at the inner edge of the packing groove recessed along the circumferential direction of the shut-off valve mounting flange hole. Except for the feature that the side wall is protruded.

According to the present invention, in the membrane gas meter, the packing groove recessed along the circumferential direction of the shut-off valve mounting flange hole and the packing groove recessed along the circumferential direction of the shut-off valve mounting screw hole are continuously provided. Thus, by forming them integrally and enlarging the inner diameter of the shut-off valve mounting flange hole, it is possible to increase the space volume of the inlet side gas inflow path and reduce the gas pressure loss.

Also, a packing groove recessed along the circumferential direction of the shut-off valve mounting flange hole and a packing groove recessed along the circumferential direction of the shut-off valve mounting screw hole are integrally formed. Therefore, the area where the packing is in contact with the packing groove is large, the shape of the packing is complicated, and the frictional resistance is also increased. Therefore, the fitting force is larger than that using a conventional packing made of an O-ring. The packing can be prevented from shifting from the packing groove.

It is explanatory drawing of the external appearance of a membrane type gas meter. It is A-A 'sectional drawing. It is explanatory drawing which shows the installation space of an entrance side inflow path and a cutoff valve. It is explanatory drawing which shows the packing groove, the screw hole, and side wall which were formed around the flange hole for cutoff valve attachment. (A) It is explanatory drawing of packing. (B) is explanatory drawing which shows the state which fitted packing to the packing groove | channel. (C) is sectional drawing which shows the screw hole for shut-off valve attachment of the state which fitted packing to the packing groove | channel. (D) is explanatory drawing which shows the state which attached the cutoff valve. These are explanatory drawings which show the packing groove | channel etc. which were formed around the flange hole for the conventional cutoff valve attachment.

An embodiment 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 measuring film is assembled in the measuring chamber, and a machine chamber, a measuring circuit, and the like are assembled in the inside. It consists of the upper case 3.

Further, in the upper case 3, an inflow path 6 through which gas entering from the inlet side cap 4 reaches the shutoff valve 14 and a gas outflow path 7 from which gas exiting the measurement chamber reaches the outlet base 5 are formed.

Explaining the inflow path 6, a vertical flow path 8 is formed in the vertical direction below the inlet base 4, and a shut-off valve mounting space 9 is formed so as to partially cover the lower end of the vertical flow path 8. Has been.

The front wall 10 of the shut-off valve mounting space 9 is formed with a shut-off valve mounting flange hole 11 and a shut-off valve mounting screw hole 12 and the shut-off valve mounting space 9 facing the shut-off valve mounting flange hole 11 is formed. A valve seat 15 is formed on the rear wall 13 so that the valve 14a of the shutoff valve 14 is in close contact therewith.

As shown in FIGS. 4 to 7, the front wall 10 has a packing groove 16 a recessed along the circumferential direction of the shut-off valve mounting flange hole 11 and the circumferential direction of the shut-off valve mounting screw hole 12. A packing groove 16 is formed by integrating the packing groove 16 b that is recessed along the packing groove 16 b, and a packing 17 is fitted into the packing groove 16.

Reference numeral 18 denotes a side wall, and this side wall 18 protrudes from the inner edge of the packing groove 16a except for the portion related to the packing groove 16b.

The shut-off valve 14 is attached to the front wall 10 by tightening a screw 19 into the shut-off valve mounting screw hole 12 and is operated by a signal from an earthquake sensor (not shown) or a gas pressure sensor (not shown). The valve 14a of the shut-off valve 14 comes into close contact with the valve seat 15 and stops the gas reaching the measuring chamber.

20 is a shut-off valve reset button, and 21 is a display window.

As described above, according to the present invention, by forming the packing groove 16 at the position related to the shut-off valve mounting screw hole 12, the inner diameter of the shut-off valve mounting flange hole 11 is expanded to increase the space volume of the shut-off valve mounting space 9. Since it can be increased, the pressure loss of the gas from the inlet base 4 to the measuring chamber via the inflow path 6 can be reduced as compared with the conventional case.

Also, a packing groove recessed along the circumferential direction of the shut-off valve mounting flange hole and a packing groove recessed along the circumferential direction of the shut-off valve mounting screw hole are integrally formed. For this reason, it is difficult for the fitted packing to be displaced from the packing groove.

DESCRIPTION OF SYMBOLS 1 Gas meter 2 Lower case 3 Upper case 4 Inlet side cap 5 Outlet side cap 6 Gas inflow path 7 Gas outflow path 8 Vertical flow path 9 Shut-off valve mounting space 10 Front wall 11 Shut-off valve mounting flange hole 12 Shut-off valve mounting Screw hole 13 Rear wall 14 Shut-off valve 14a Valve 15 Valve seat 16 Packing groove 16a Packing groove 16b Packing groove 17 Packing 18 Side wall 19 Screw 20 Reset button 21 Display window

Claims (1)

A pair of measurement membranes are assembled in a measurement chamber formed in the lower case of the gas meter body, and an inflow path on the inlet side of gas flowing into the measurement chamber formed in the upper case of the gas meter body and the emergency operation in the inflow path In a membrane gas meter with a gas shut-off valve assembled,
A shutoff valve mounting space is formed so as to partially extend from the gas inlet gold formed on the upper surface of the upper case to the lower end of the vertical flow path formed in the vertical direction, and the shutoff valve is formed on the front wall of the shutoff valve mounting space. Forming a flange hole for mounting and forming a valve seat on a rear wall of the shut-off valve mounting space facing the shut-off valve mounting hole;
A packing groove is formed in the front wall of the shut-off valve mounting space along the circumferential direction of the shut-off valve mounting flange hole, and the packing groove is formed around the shut-off valve mounting flange hole. Fitting an elastic packing that is formed integrally with the packing groove that is recessed along the circumferential direction of the screw hole and that is elastic to the packing groove;
Except for the portion related to the packing groove recessed along the circumferential direction of the shut-off valve mounting screw hole at the inner edge of the packing groove recessed along the circumferential direction of the shut-off valve mounting flange hole Projecting side walls,
A membrane gas meter.

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