JPH03255319A - Gas meter with built-in shut-off - Google Patents

Abstract

PURPOSE:To make it possible to use an upper case for gas meters for a left inlet and a right inlet commonly by connecting inlet and outlet pipes which are provided at a lower case in right and left symmetric patterns to either of a pair of gas outlet and inlet ports which are provided at the upper case so that the pipes can be replaced, and attaching a shut-off valve for controlling the inlet port. CONSTITUTION:The upper ends of an inlet pipe 12 housing a shut-off valve 9 and an outlet pipe 13 are formed in a common shape. Packings 19 and 20 have the common shape. Attaching seats 16a and 16b have also the common shape. Therefore, when a lower case 1 is rotated by 180 degrees with respect to an upper case 16, the inlet pipe 12 can be coupled with the attaching seat 16b on the side of a gas outlet pipe 18, and the outlet pipe 13 can be coupled with the attaching seat 16a on the side of a gas inlet pipe 17. In this way, the number of components can be reduced. Furthermore, the control of the shapes and the sizes of the components and assembling are simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a gas meter with a built-in shutoff valve, and more particularly to a gas meter with a built-in shutoff valve that can share the parts of the left and right inlet meters.

(Prior art) Seismic detectors and gas leak alarms are known as safety devices for gas appliances, and shutoff valves are activated in conjunction with the activation of these safety devices to prevent gas leakage. It is being said.

Furthermore, a gas meter with a built-in shutoff valve is also known, which incorporates this shutoff valve into the gas meter to facilitate piping.

FIG. 7 to FIG. 10 show a conventional shutoff valve inner membrane type gas meter. FIGS. 7 and 8 are a front view and a side view, respectively, showing the appearance of a conventional gas meter. In these figures, an upper case 3 with a meter main body 2 disposed on the front is airtightly attached to a lower case 1 forming a gas metering chamber. The upper case 3 is provided with a gas inlet 4 and a gas outlet 5 that communicate with the measuring chamber side, and a back plate 6 is attached to the back surface.

FIG. 9 is a back view of the upper case 3 with the back plate 6 removed, and FIG. 10 is a sectional view taken along line A--A in FIG. 9. A valve seat 8 is provided in a gas passage 7 that communicates the gas inlet 4 with the metering chamber of the meter body 2, and a cutoff valve 9 is attached opposite to the valve seat 8. When the shutoff valve 9 is activated, the valve body 10 comes into contact with the valve seat 8 and closes the gas flow path 7. (Problem to be solved by the invention) However, according to the conventional gas meter having the above structure,
The cutoff valve 9 is generally installed on the gas inlet 4 side, and is placed in the upper case 3 facing the valve seat 8 provided in the gas flow path 7.
Since the upper case 3 is directly attached to the gas inlet 4
The left entrance system is located on the left side when viewed from the front of the meter.
There were two types: a right entrance type that was installed on the right side.

In other words, the upper case 3 has two types: a left entrance system and a right entrance system.
It was necessary to use a specific type of product.

Moreover, since the upper case 3 is usually molded by die casting, the mold is shown in arrows B and C in FIG. 10 according to the above structure.
It is necessary to split the mold in two directions as shown by the arrows,
It was necessary to use a two-way sliding mold as shown in E, which caused the problem that the mold was complicated and expensive. Moreover, there was also the problem that defects were likely to occur during molding.

This invention has been made in view of the above points, and allows the upper case to be used in common for the left and right entrances, and also simplifies the structure of the mold for molding. The purpose of the present invention is to provide an inexpensive gas meter with a built-in shutoff valve.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a lower case constituting a measuring chamber, and a pair of gas inlets located on the lower case and communicating with the measuring chamber. In a gas meter with a built-in cutoff valve, the gas meter includes an upper case in which a meter body is provided, and a cutoff valve provided in a gas flow path on the gas inlet side in the upper case. One end of the inlet pipe and the outlet pipe communicating with the chamber are fixed airtightly and symmetrically, and the other ends of the inlet pipe and the outlet pipe are respectively connected to a pair of gas outflow inlets provided in the upper case. The invention is characterized in that the shutoff valve is connected to either one of the two in an exchangeable and airtight manner, and the shutoff valve is attached to the inlet pipe.

Further, either the inlet pipe line or the outlet pipe line may be formed integrally with the inner case attached to the upper surface of the lower case.

(Function) According to the above configuration, the other ends of the artificial pipe and the outlet pipe, each of which has one end fixed to the lower case, are removed from the gas outflow inlet of the upper case, rotated 180 degrees, and then connected to the gas outflow inlet on the opposite side. By airtightly attaching the gas meter to the gas meter, the gas meter can be used with either the left inlet method or the right inlet method.

Furthermore, the mold used when molding the upper case can be composed of a split mold and a one-way sliding mold.

In addition, by forming either the artificial pipe line or the outlet pipe line integrally with the internal case, the number of parts can be reduced.
The ease of assembly is improved, and the gas passage can be expanded.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line FF in FIG. The lower case 1 has the same structure as the conventional example shown in FIGS. 7 and 8, so illustration thereof is omitted. Lower case 1
An inner case 11 is attached to the upper part, and on the inner case 11, an artificial conduit 12 and an outlet conduit 13, which are connected to the lower case 1, are installed with gaskets 14 at symmetrical positions with respect to the center line. .15 and hermetically sealed.

The upper case 16 is formed into a substantially rectangular shape, and a gas inlet 17 and a gas outlet 18 are integrally formed on the upper surface of the upper case, projecting at symmetrical positions with respect to the center line. Furthermore, when the upper case 16 is attached to the lower case 1, the upper ends of the inlet pipe 12 and the outlet pipe 13 are fitted with gaskets at the positions on the inner surface of the upper case 16 where the upper ends of the inlet pipe 12 and the outlet pipe 13 contact, respectively. 19. Mounting seat 16 that fits airtight through 20
a.

16b is integrally formed. A valve seat 21 is provided in the inlet pipe 12 in parallel to the center line of the gas inlet 17, and a shutoff valve 9 has a valve body 22 facing the valve seat 21.
is attached to the inlet conduit 12. 1 is a gear train that drives the meter main body 2 shown in FIG. 5, and 24 is a link mechanism that transmits the operation of the metering chamber in the lower case 1 to the gear train 23.

In the above configuration, the upper ends of the inlet pipe line 12 and the outlet pipe line 13 have a common shape, and the gasket 19.20
They also have a common shape. At the same time, mounting seats 16a and 16b
They also have a common shape.

Therefore, the lower case 1 is rotated 180 degrees with respect to the upper case 16, and the inlet pipe line 12 is connected to the mounting seat 16b on the gas outlet pipe 18 side.
and connect the outlet pipe 13 to the mounting seat 1 on the gas inflow pipe 17 side.
6a.

According to this embodiment, as shown in FIG.
A gas meter for the left inlet can be constructed by assembling the inlet pipe line 12 on the left side with respect to the front surface of the case, and the outlet pipe line 13 on the right side with respect to the front surface of the case. Remove the lower case 1, rotate it 180 degrees, install the inlet pipe 12 on the right side, and install the outlet pipe 13 on the left side.
By assembling, a gas meter for the right inlet can be constructed. Therefore, the upper case 16 can be used commonly for gas meters for left inlet and right inlet.
Cost reduction can be achieved.

Further, since the upper case 16 has a simple surface shape, the mold used when die-casting the upper case 16 can be composed of only a split mold in the vertical direction in the figure and a sliding mold in one direction. Therefore, the mold structure becomes simple, and it is possible to reduce the mold cost and improve the life of the mold.

Other embodiments of the invention are shown in FIGS. 5 and 6. In these figures, parts corresponding to those in the embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and their explanations will be omitted.

In this embodiment, the inner case 11 and the artificial conduit 12 are integrally formed.

According to this embodiment, by integrating the inlet pipe line 12 which was separate from the inner case 11 in the first embodiment, the seal 14 is also unnecessary and the number of parts can be reduced. Furthermore, the management of component shapes and dimensions and assembly are simplified, and costs can be reduced. Further, in this embodiment, the direction in which the shutoff valve 9 is attached to the meter body is opposite for the left and right inlets, but this does not pose any problem in assembly work and wiring is easy. Furthermore, the gas passage is enlarged by the integration, and pressure loss can be reduced.

Note that if both the inlet pipe line 12 and the outlet pipe line 13 are integrally formed in the inner case 11, the positions of the mounting seats 16a and 16b and the pipe lines 12 and 13 will be adjusted when attached to the upper case 16.
Dimensional errors may accumulate and make assembly impossible. Therefore, in this embodiment, only the inlet pipe line 12 is formed integrally with the inner case 11.

Note that the outlet pipe line 13 may be formed integrally with the inner case 11 instead of the inlet pipe line 12.

〔Effect of the invention〕

As explained above, according to the present invention, the inlet pipe line and the outlet pipe line symmetrically provided in the lower case can be replaced with either one of the pair of gas outlet ports provided in the upper case. Since the upper case is connected to the gas meter and a cutoff valve is attached to the inlet pipe, the upper case can be used in common for the left inlet gas meter and the right inlet gas meter, thereby reducing costs.

Furthermore, the structure of the mold for molding the upper case is simplified, reducing the cost of the mold and improving the life of the mold.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing the essential parts of an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line FF in FIG. 1, and FIGS. 3 and 4 are explanations showing the operation of this embodiment. 5 is a vertical sectional view showing the main part of another embodiment of the present invention, and FIG. 6 is a line GG in FIG. 5.
7 and 8 are respectively a front view and a side view showing the external appearance of a conventional gas meter, FIG. 9 is a back view, and FIG. 10 is a sectional view taken along line A-A in FIG. 7. . 1...Lower case 2...Main body 9...Shutoff valve 12...Inlet pipe line 13...Outlet pipe line 16...Upper case 17...Gas inlet 18...・Gas outlet

Claims (1)

[Scope of Claims] 1. A lower case constituting a metering chamber; an upper case on the lower case and provided with a meter body having a pair of gas inlets and inlets communicating with the metering chamber; In a gas meter with a built-in shutoff valve, which is provided with a shutoff valve provided in a gas flow path on a gas inlet side in an upper case, one end of an inlet pipe and an outlet pipe that communicate with the measuring chamber are provided on the upper surface of the lower case, respectively. are airtightly and symmetrically fixed, and the other ends of the inlet pipe and the outlet pipe are respectively replaceably and airtightly connected to either one of the pair of gas outlet ports provided in the upper case. A gas meter with a built-in cutoff valve, characterized in that the cutoff valve is attached to the inlet pipe. 2. The gas meter with a built-in shutoff valve according to claim 1, wherein either one of the inlet pipe line and the outlet pipe line is formed integrally with an inner case attached to the upper surface of the lower case.