JP2533963B2 - Gas meter with built-in shutoff valve - Google Patents

Description

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 in which parts of left and right inlet meters can be shared.

(Prior Art) Seismic sensors and gas leak alarms are known as safety devices for gas appliances, and the shutoff valve is operated in conjunction with the operation of these safety devices to prevent gas outflow. It is being appreciated.

There is also known a gas meter with a built-in shutoff valve that facilitates piping by incorporating this shutoff valve in a gas meter.

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

9 is a rear view showing a state where the back plate 6 of the upper case 3 is removed, and FIG. 10 is a sectional view taken along the line AA of FIG. A valve seat 8 is provided in a gas passage 7 that connects the gas inlet 4 and the metering chamber of the meter body 2, and a shutoff valve 9 is attached to face the valve seat 8. When the shutoff valve 9 is operated, the valve body 10 comes into contact with the valve seat 8 to close the gas passage 7.

(Problems to be Solved by the Invention) However, according to the conventional gas meter having the above-described structure, the shutoff valve 9 is generally installed on the gas inlet 4 side and shuts off while facing the valve seat 8 provided in the gas flow path 7. Since the valve 9 is directly attached to the upper case 3, the upper case 3 has two types, a left inlet system in which the gas inlet 4 is provided on the left side when viewed from the front of the meter and a right inlet system in which the gas inlet 4 is provided on the right side. It was That is, it is necessary to exclusively use the upper case 3 having two types of the left entrance method and the right entrance method.

Further, since the upper case 3 is usually formed by die casting, according to the above structure, the mold needs to be a two-way split mold shown by arrows B and C in FIG. 10, and further shown by arrows D and E. It must be a two-way slide type, and there is a problem that the die is complicated and expensive. Moreover, there is a problem that defects are likely to occur during molding.

The present invention has been made in view of the above points, and it is possible to make the upper case common to the left inlet and the right inlet, and to simplify the mold structure for molding. An object of the present invention is to provide an inexpensive gas meter with a built-in shutoff valve.

[Structure of Invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a lower case that constitutes a measuring chamber, and a pair of detachably mounted on the lower case and communicates with the measuring chamber. A gas meter with a built-in shutoff valve, comprising an upper case having a gas outflow inlet and a left symmetrical position and provided with a meter main body, and a shutoff valve provided in a gas flow path on the gas inflow side of the upper case. , One end of each of the inlet pipe and the outlet pipe communicating with the measuring chamber is airtightly and symmetrically fixed to the upper surface of the lower case, and the other ends of the inlet pipe and the outlet pipe are respectively connected to the upper side. It is replaceably and airtightly connected to either one of a pair of gas outflow / inlet ports provided in the case, and the shutoff valve is attached to the inlet pipe line. The end of the gas outflow It is characterized in that the gas inlet can be changed to the left and right positions by removing it from the inlet and rotating the lower case 180 °.

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

(Operation) According to the above configuration, the other end of the inlet pipe line and the other end line of which one end is fixed to the lower case are removed from the gas outflow port of the upper case, and they are rotated 180 degrees and the gas outflow port of the opposite side is rotated. The gas meter can be used by changing the left inlet method and the right inlet method by respectively airtightly mounting the gas meter.

Further, the mold used for molding the upper case can be composed of a split mold and a unidirectional slide mold.

Further, by forming either the inlet pipe line or the outlet pipe line integrally with the inner unit case, the number of parts can be reduced, the assemblability can be improved, and the gas passage can be enlarged.

Embodiment 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, FIG. 2 is a sectional view taken along the line FF of FIG. 1, and the cutoff valve 9 is shown without a sectional view. The lower case 1 has the same structure as the conventional example shown in FIGS. 7 and 8, and therefore the illustration thereof is omitted. An inner unit case 11 is attached on the lower case 1, and an inlet conduit communicating with the lower case 1 is mounted on the inner unit case 11.
Pack the 12 and the outlet line 13 at symmetrical positions with respect to the center line.
It is attached airtightly via 14, 15.

The upper case 16 is formed in a substantially rectangular box shape, and a gas inlet 17 and a gas outlet 18 are integrally formed on the upper surface at positions symmetrical with respect to the center line. Also upper case 16
When installed in the lower case 1, the inlet line 12 and the outlet line
At the position of the inner surface of the upper case 16 with which the upper end of 13 abuts, mounting seats 16a and 16b are formed integrally with which the upper ends of the inlet pipe line 12 and the outlet pipe line 13 are airtightly fitted via packings 19 and 20, respectively. ing. The inlet pipe 12 is provided with a valve seat 21 parallel to the center line of the gas inlet 17, and a valve body facing the valve seat 21.
A shut-off valve 9 having 22 is attached to the inlet line 12. Reference numeral 23 shown in FIG. 1 is a gear train for driving the meter main body 2 shown in FIG. 5, and reference numeral 24 is a link mechanism for transmitting the operation of the measuring chamber in the lower case 1 to the gear train 23.

In the above structure, the upper ends of the inlet pipe line 12 and the outlet pipe line 13 have a common shape, and the packings 19 and 20 also have a common shape. At the same time, the mounting seats 16a and 16b have a common shape. Therefore, the lower case 1 is 18 times the upper case 16.
Rotate by 0 degrees to move the inlet pipe 12 to the mounting seat 16b on the gas outlet pipe 18 side.
It is possible to fit the outlet pipe line 13 to the mounting seat 16a on the gas inflow pipe 17 side.

According to this embodiment, as shown in FIG.
A gas meter for the left inlet can be constructed by assembling the inlet conduit 12 on the left side and the outlet conduit 13 on the right side of the front surface of the upper case as shown in FIG.
A gas meter for the right inlet can be constructed by removing the lower case 1 with respect to 16 and rotating it by 180 degrees, and assembling the inlet conduit 12 on the right side and the outlet conduit 13 on the left side. Therefore, the upper case 16 can be commonly used for the left inlet gas meter and the right inlet gas meter, and the cost can be reduced.

Also, since the upper case 16 is a simple box shape,
The die used for die casting of 16 can be composed of only a split mold in the vertical direction and a slide mold in one direction in the figure. Therefore, the mold structure is simplified, and the mold cost can be reduced and the mold life can be improved.

5 and 6 show another embodiment of the present invention. In these figures, the parts corresponding to those of the embodiment shown in FIGS. 1 and 2 are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, the inner unit case 11 and the inlet pipe line 12 are integrally formed.

According to this embodiment, since the inlet pipe 12 in the first embodiment is separate from the inner unit case 11, the packing 14 is unnecessary and the number of parts can be reduced. Further, the management of the shape and size of the parts and the assembling can be simplified, and the cost can be reduced. Further, in this embodiment, the shut-off valve 9 is attached to the meter body in opposite directions for the left and right inlets, but there is no hindrance to the assembly work and wiring is easy. Further, the gas passage can be expanded by the integration to reduce the pressure loss.

The inlet pipe 12 and the outlet pipe 13 are both connected to the inner unit case 11
If it is integrally formed with the upper case 16, a dimensional error between the positions of the mounting seats 16a, 16b and the positions of the conduits 12, 13 may be accumulated when the upper case 16 is mounted, and assembling may be impossible. Therefore, in this embodiment, only the inlet pipe 12 is formed integrally with the inner unit case 11.

Instead of the inlet pipe 12, the outlet pipe 13 is replaced with the inner unit case 11
It may be formed integrally with.

〔The invention's effect〕

As described above, according to the present invention, the inlet pipe line and the outlet pipe line that are symmetrically provided in the lower case can be replaced with either one of the pair of gas outflow and inlet ports provided in the upper case. , And the shutoff valve was attached to the inlet pipe, remove the other end of the inlet pipe and the outlet pipe from the gas outflow inlet, and rotate the lower case 180 ° to turn the upper case into the left inlet. Also, the gas meter for the right inlet can be used in common, and the cost can be reduced.

In addition, the mold structure for molding the upper case is simplified, and the mold cost can be reduced and the mold life can be improved.

Furthermore, according to the second aspect of the invention, the number of parts can be further reduced, the management of the shape of the parts and the dimensions of the mold and the assembling can be simplified, and the cost can be further reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an essential part of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line FF of FIG. 1, and FIGS. 3 and 4 are explanatory views showing the operation of this embodiment. 5 and 5 are longitudinal sectional views showing the main part of another embodiment of the present invention, and FIG. 6 is a sectional view taken along line GG of FIG.
FIG. 7 is a front view and a side view showing the appearance of a conventional gas meter, FIG. 9 is a rear view of the same, and FIG. 10 is a sectional view taken along the line AA of FIG. . 1 …… Lower case 2 …… Meter body 9 …… Shutoff valve 12 …… Inlet line 13 …… Outlet line 16 …… Upper case 17 …… Gas inlet 18 …… Gas outlet

Claims (2)

(57) [Claims] 1. A lower case constituting a measuring chamber, and a pair of gas outflow / removable ports, which are detachably mounted on the lower case and communicate with the measuring chamber, at symmetrical positions, and a meter body is provided. A gas meter with a shut-off valve provided in a gas flow path on the gas inlet side in the upper case, wherein an inlet communicating with the measuring chamber is provided on an upper surface of the lower case. One ends of the pipeline and the outlet pipeline are airtightly and symmetrically fixed, and the other ends of the inlet pipeline and the outlet pipeline are respectively connected to one of a pair of gas outflow inlets provided in the upper case. It is exchangeably and airtightly connected, and the shutoff valve is attached to the inlet pipe line, and the other ends of the inlet pipe line and the outlet pipe line are removed from the gas outlet / inlet port, and the lower case is opened by 180 °. To rotate Ri, shut-off valve internal gas meter, characterized in that to enable changing the gas inlet to the left and right positions. 2. The shutoff valve according to claim 1, wherein one end of either the inlet pipe line or the outlet pipe line is formed integrally with an inner unit case attached to the upper surface of the lower case. Built-in gas meter.