JPH0419476Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a gas meter, particularly a dry gas meter for medium and high pressure.

Conventionally, in dry gas meters with independent internal units, the outer casing is made airtight by fixing the lower case with screws via sheet packing to the upper case where the inner unit is suspended and fixed. What is done and what is done. In addition, in the case of the internal unit integrated type, the outer case is made airtight by tightening and fixing the belly plate with screws through sheet packing to both sides of the main body case with the internal unit installed. There is.

Conventionally, when any of the above-mentioned gas meters is used for normal low pressure, only the main body case is made of a die-cast molded product with high strength, and the lower case and belly plate are made of a die-cast molded product with high strength. Due to the request of
However, in medium- or high-pressure gas meters, when using the above-mentioned outer case, the strength of the lower case and belly plate made of sheet metal is insufficient, so the airtightness cannot be achieved at the screw-fastened joint with the main case. There is a great risk that the gas leakage may occur due to the incompleteness of the gas. For this reason, in such gas meters for medium pressure and above, the lower case and belly plate are required to be made of die-cast molded products in the same way as the main body case. Since the belly plate cannot be used in common and must be manufactured separately, there is a regret that the cost including the manufacturing cost of the mold for manufacturing it will increase.

In view of the above-mentioned matters, this idea was developed to use the outer casing of a low-pressure gas meter as it is, and to create a system that eliminates the risk of gas leakage even in medium- or higher-pressure gas meters, thereby reducing manufacturing costs. It was done for that purpose.

For this purpose, this invention is designed to create an airtight exterior by fixing the lower case or belly plate to the main body case made of a die-cast molded product to which the inner engine is attached, by screwing the mounting periphery of the lower case or belly plate through sheet packing. In the gas meter in which a box is formed, the lower case or the belly plate is made of a press-molded sheet metal product, and the mounting flange is applied to the outer surface of the flange around the entire circumference of the flange. The device is characterized in that it is fastened and fixed to the main body case with a fixing screw via an annular presser washer.

This will be explained below with reference to the illustrated embodiment.

FIGS. 1 and 2 show an embodiment of an independent internal type medium pressure gas meter. In these figures, 1 is an outer case, which is composed of an upper main body case 2 and a separate lower case 3. The upper case 2 is made of a die-cast molded product and has an open bottom surface.The inner unit 4 is suspended and fixed inside the upper case 2, and a counter portion 5 is provided on the front surface of the upper part. On the other hand, the lower case 3 is made of a press-formed steel plate and has an open upper surface, and has a peripheral flange portion 3a for mounting that projects outward in the shape of a flange at the upper end. Reference numeral 6 denotes an annular presser washer placed around the circumferential flange 3a and in contact with the outer surface thereof, and a fixing screw 7 is inserted from the lower surface side of the washer 6 through the mounting flange 3a to the upper main body case. By being screwed into the second side,
The main body case 2 and the lower case 3 are integrally joined in an airtight manner via a sheet packing 8. The screw 7 is usually an oval head screw with a circular head.

FIGS. 3 and 4 show an embodiment of a medium-pressure gas meter integrated with the internal unit. In these figures, reference numeral 11 denotes an outer case, which includes a main body case 12 to which an inner unit 14 is fixed, an upper case 12a which is attached to the upper surface of the case through a sheet packing 19 and fixed by tightening with screws 20, and the main body. A pair of belly plates 13, 13 that cover both side opening surfaces of the case 12
It becomes more. Main case 12 and upper case 1
2a are both made of die-cast molded products, while the belly plates 13, 13 are plate-shaped made of press-formed steel plates, and the mounting peripheral flange 13a is inserted through the sheet packing 18. An annular presser washer 16 surrounding the peripheral flange 13a is placed in contact with the main body case 12 and on the outer surface thereof, and a fixing screw 17 is inserted from the outside via the washer 16.
are screwed into the main body case 12 side so that they are integrally joined to each other in an airtight state.

Since this invention has the above-mentioned configuration, in the configuration of the outer cases 1 and 11, regardless of whether a sheet metal press-formed product is used for the lower case 3 or the belly plate 13, the mounting circumference is not required. Flange part 3a,
13a is restrained from the outside by the annular holding washers 6, 16, the strength of the peripheral flange is supplemented, and the peripheral flange does not deform even when the internal pressure inside the outer case increases. Therefore, the airtightness in the joined state with the main body cases 2 and 12 is reliably maintained, gas leakage is prevented, and high safety can be guaranteed. In this way, by using press-molded products for the lower case 3 and belly plate 13, and maintaining the required pressure-tightness and airtightness for the outer case of a medium- and high-pressure gas meter, it is possible to maintain the required pressure-tightness and airtightness for the outer case of a conventional low-pressure gas meter. This has the advantage that it becomes possible to use the gas meter as it is, and by using these members in common, it becomes possible to manufacture and provide a medium-high pressure gas meter at a low cost.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a longitudinal sectional view of the embodiment of an internal unit independent gas meter, and FIG. 2 is a sectional view taken along the line shown in FIG. 1.
FIG. 3 is a partially exploded side view of an embodiment of an integrated gas meter, and FIG. 4 is a front view thereof. 1, 11... Outer case, 2, 12... Main case, 3... Lower case, 13... Belly plate, 4, 14
... Inner machine, 6, 16 ... Annular presser washer, 7,
17...Fixing screw.

Claims (1)

[Scope of utility model registration request] In a gas meter, the lower case or belly plate is screwed to the main body case made of a die-cast molded product to which the inner unit is attached, and the mounting flange thereof is screwed through sheet packing to form an airtight outer case. , the lower case or the belly plate is made of a press-molded sheet metal product, and the peripheral flange for attachment thereof is
A gas meter for medium and high pressures, characterized in that the gas meter is fastened and fixed to the main body case with a fixing screw via an annular presser washer applied to the outer surface of the circumferential flange.