JPH0245582Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention relates to a valve open/close display mechanism for a gas meter with a built-in shutoff valve.

<Prior Art> The applicant previously assembled a solenoid-type shutoff valve in a gas meter, and used it to detect the reduced pressure state of gas supplied into the housing of the gas meter, and to use it for other purposes such as gas leak detectors and sensors. We have developed a mechanism that operates a shutoff valve in conjunction with the output of a seismic device.

The advantage of this structure is that the gas can be shut off at the gas source.

A return device is added to this type of shutoff valve, and the shutoff valve is opened by operating the device to push back the valve body of the shutoff valve each time gas is released.

《Problem that the invention aims to solve》 However, since this return device is provided solely for the purpose of return, the front of the operation part is usually covered with a blind screw, so if you are unfamiliar with it, it may be difficult to use. If it is unclear which part to operate, or if the piping is complicated, it takes time to determine whether the gas meter is shutting off or another part. In addition, it was not possible to judge whether the gas had returned until the gas was actually flowing.

This invention is intended to solve the above problems, and aims to eliminate the above disadvantages by simply adding a simple display function to this type of return mechanism.

<<Means for solving the problem>> In order to achieve the above-mentioned object, this invention includes a shutoff valve that is located in the flow path on the gas inlet side and that opens and closes the flow path, and a valve body of the shutoff valve that contacts the valve body of the shutoff valve. A cam that rotates and
a return operation knob that rotates with the cam shaft of the cam and displays its rotational displacement on the front of the gas meter; a return positioning cam that positions the knob to an open or closed position; and a return cam. It is characterized by comprising a spring that is interposed between the knobs and biases the knobs to rotate in the closing direction.

<<Operation>> By rotating the operating knob according to the position of the valve body, it is possible to visually confirm from the outside whether the valve is actually shut off or restored.

<<Example>> Hereinafter, an example of this invention will be described in detail using the drawings.

Fig. 1 is a partially cutaway front view of the gas meter according to this invention, Fig. 2 is a side sectional view of the same main part, Fig. 3 is a front explanatory view showing the display part, and Fig. 4 shows the connection between the knob and the return cam. FIG. In the figure, gas meter GM has upper case 1 and lower case 2.
are airtightly connected via flanges 1a and 2a.

The upper case 1 is provided with a gas inlet port 3 and an outlet port 4, and the gas introduced from the inlet port 3 enters the lower case 2 from the upper case 1 and passes through a meter-driven meter built in the lower case 2. A membrane plate (not shown) for this purpose is expanded and contracted, and then the liquid is supplied from the outlet port 4 to the end equipment side via the upper case 1 again.

Then, the expansion and contraction force of this membrane plate is taken out via the power transmission mechanism 5 disposed inside the upper case 1,
A display board 6 provided on the front surface of the upper case 1 displays an integrated amount of gas consumption.

A nozzle 7 that communicates the upper case 1 back and forth is arranged at a lower portion of the inlet port 3 so as to be perpendicular to the inlet port 3.

A solenoid-type cutoff valve 8 is arranged on the gas downstream side of the nozzle 7, and a return cam 9 is installed inside the nozzle 7.
is placed.

The cutoff valve 8 is located inside the upper case 1, and
A bracket portion 7 vertically installed around the nozzle 7
Sealed case 81 fixed to 1 via screw B
, a solenoid 82 airtightly housed inside a case 81 , a valve body 84 provided at the upper end of a plunger 83 that protrudes from the solenoid 82 , and a space between the case 81 and the valve body 84 on the outer periphery of the plunger 83 . It consists of an interposed spring 85.

In the normal state, the plunger 83 of the shutoff valve 8 is retracted against the spring pressure of the spring 85, and as a result, a gas passage is formed between the nozzle 7 and the valve body 84 as shown.

When a cutoff signal is input, the plunger 83 is projected by the spring pressure of the spring 85, and the valve body 84 closes the nozzle 7 to cut off the gas.

The cam 9 has a cam shaft 91 that passes through the upper case 1 in the front and rear directions and is airtightly and rotatably supported.
It is provided at the bearing end on the nozzle 7 side.

An externally protruding end of the camshaft 91 protrudes toward the surface of the display panel 6 provided on the front surface of the upper case 1.

A knob 92 for return operation that also serves as a display is integrated into this protruding end.

A return positioning cam 93 that is freely rotatably inserted through the camshaft 91 is arranged on the back of the knob 92, and a coiled spring 94 is interposed between the return cam 93 and the knob 92.

On the outer periphery of the camshaft 91, the return cam 93
A compression coil spring 95 is inserted between the end face of the upper case 1 and the end face of the upper case 1.
is pressed against the back of the

As a result, the coiled spring 94 urges the knob 92 and the return cam 93 to rotate in opposite directions.

A locking protrusion 93 is provided on the outer periphery of the return cam 93.
-1 is provided in a protruding manner, and rotation is prevented by engaging the locking protrusion 93-1 with a groove (not shown) formed in the upper case 1. Therefore, only the knob 92 is relatively biased to rotate counterclockwise.

Further, a pair of open position stoppers 93-2 and a pair of closed position stoppers 93-3 are formed in two stages protruding from the end surface of the return cam 93 in the circumferential direction. On the other hand, each stopper 93-
Locking protrusions 92-1, 92 meshing with 2, 93-3
-1 is provided in a protruding manner and engaged with the return cam 93 side by the spring pressure of the spring 95 in the form of an end face clutch.

As a result, in the valve open state, the knob 92 is held at a predetermined rotation angle counterclockwise by the locking protrusion 92-1 coming into contact with the stopper 93-2.
The cam 9 is maintained at a position slightly apart from the valve body 84.

The periphery of the protruding end of the knob 92 from the display panel 6 is covered with a screw-in transparent protective cap 10.

Around the protective cap 10 are "closed",
Open/close display marks 11 indicated by "open" and "arrow" are engraved at predetermined positions.

An index 12 is engraved on the end face of the knob 92 in accordance with the display mark 11.

When the shutoff valve 8 is in the non-operating state, the indicator 12 indicates "open".

When a cutoff pulse is output to the solenoid 82 in this state, the valve body 84 rises and closes the nozzle 7. Following this, the cam 9 rotates, and the cam shaft 91
and the knob 92 rotates counterclockwise.

When the knob 92 rotates, the locking protrusion 92-
1 climbs over the slope of the open position stopper 93-2,
It hits the closed position stopper 93-3 and is held at that position.

As a result, the indicator 12 indicates the "closed" position.

Therefore, depending on the position of this indicator 12, it is possible to visually confirm whether the shutoff valve 8 is in operation or not.

To return from the valve closed state, the cap 1
0 and turn the knob 92 clockwise in the direction of the arrow, the valve body 84 will descend and open the nozzle 7.
is opened and held in that state by the solenoid 82.

The reference numeral 14 in FIG. 2 is a terminal plate airtightly fixed to the front surface of the upper case 1, and the terminal 1 provided on this terminal plate
The solenoid 82 is connected to the external lead wire 15 through 4a.

<<Effects of the invention>> As explained above, according to this invention, the gas can be shut off at the gas source in an emergency. Moreover, by turning the operating knob, it is possible to visually confirm whether the gas is actually shut off or restored at a glance from the outside, and the gas shut off position can be immediately identified.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the gas meter according to this invention, Fig. 2 is a side sectional view of the same main part, Fig. 3 is a front explanatory view showing the display part, and Fig. 4 shows the connection between the knob and the return cam. FIG. GM...Gas meter, 1...Upper case, 2...
Lower case, 3...Gas inlet port, 4...Outlet port, 7...Nozzle, 8...Shutoff valve, 9...Cam, 11...Display mark, 12...Index, 84...
... Valve body, 91 ... Camshaft, 92 ... Return operation knob, 93 ... Return positioning cam, 94 ... Winding spring.

Claims (1)

[Scope of utility model registration request] A shutoff valve located in the flow path on the gas inlet side that opens and closes the flow path, a cam that rotates in contact with the valve body of the shutoff valve, and a cam that rotates with the cam shaft of the cam and its rotational displacement. a return operation knob that is displayed on the front of the gas meter, a return positioning cam that positions the knob in the open or closed position, and a return positioning cam that is interposed between the return cam and the knob to rotate the knob in the closing direction. A valve open/close display mechanism for a gas meter with a built-in shutoff valve, characterized by comprising a biasing spring.