JPH0336777Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention relates to a valve opening/closing mechanism for a gas meter with a built-in shutoff valve, and particularly relates to a mechanism to which a mechanism for displaying the valve opening/closing state is added.

<<Prior Art>> The applicant previously assembled a solenoid-type shutoff valve 2 to a gas meter 1 as shown in FIG. We have developed a mechanism that operates a shutoff valve in conjunction with the output of other devices, such as a gas leak detector or a seismic sensor.

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

A return mechanism is added to this type of cutoff valve 2. This return mechanism includes a return rod 5 that faces the valve body 2a protruding from the shutoff valve 2 with a nozzle 4 formed on the flow path side in between, and a spring 6 that urges the return rod 5 to a retreat position. The return rod 5 is made to protrude from the front part of the upper case 1a in an airtight manner,
When the valve body 2a releases the nozzle 4 with the nozzle 4 closed, if the return rod 5 is pressed against the spring pressure of the spring 6, the valve body 2a is pushed back.
Release the flow path.

<<Problem to be solved by the invention>> However, according to this structure, since the return rod 5 is always biased to the retracted position, it is impossible to directly check from the outside whether the valve body 2a is operating or not. However, when the gas supply stopped, it was not immediately possible to determine which part had been cut off, which meant that it would take time to restore the current situation and could lead to operational errors.

This invention is intended to solve the above problems, and its purpose is to immediately check from the outside whether or not the gas is shut off, thereby eliminating the above-mentioned problems. This provides a valve opening/closing mechanism for a gas meter.

<Means for Solving the Problems> In order to achieve the above-mentioned object, this invention includes a lower case incorporating a membrane-type suction/exhaust mechanism for sucking and discharging gas, and a flange jointed to the upper part of the lower case.
and an upper case having a built-in integration mechanism unit that converts the suction/exhaust operation into rotation and displays an integration value, and is provided with an upper case provided with a gas inlet and an exhaust port, and is provided in the flow path on the gas inlet side. a valve body of a shutoff valve disposed facing the nozzle; a return cam for the valve body rotatably held within the nozzle; and a return cam that is movably abutted against the other end of the cam. a return knob made of a transparent body mounted on the protruding end of the return rod on the front side of the upper case; a spring that biases the return knob toward the protruding side; A second spring is provided to urge the return rod to protrude toward the cam side, and the operating state of the shutoff valve is displayed at the approach/separation position of the return rod from the end face of the return knob.

<<Operation>> When the return rod is located on the forward side, it is pushing the cam, and when the return rod is in the backward position, the valve body is protruding and closing the flow path. Therefore, depending on these two states, the end of the return rod moves toward and away from the return knob, and the state of the return rod, that is, the open/closed state of the valve, can be confirmed from the outside through the return knob.

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

FIG. 1 is a partially cutaway side view of a gas meter according to this invention.

In the figure, the gas meter 10 has an upper case 12
The lower case 14 is airtightly connected via flanges 12a and 14a.

A gas inlet port 16 and an outlet port (not shown) are provided on both sides of the upper part of the upper case 12.
Gas introduced from the inlet port 16 enters the lower case 14 from the upper case 12, expands and contracts a membrane plate (not shown) for driving a meter installed in the lower case 14, and then passes through the upper case 12 again to the outlet. It is supplied from the port to the end equipment side.

Then, the expansion and contraction force of this membrane plate is applied to the upper case 12.
Integration chamber 1 provided on the front surface of upper case 12
8, the integrated amount of gas consumption is displayed.

A nozzle 20 that communicates the upper case 12 back and forth is disposed below the inlet port 16 and perpendicular to the inlet port 16 .

A solenoid-type shutoff valve 22 is arranged on the gas upstream side of the nozzle 20, and a cam 24 is disposed inside the nozzle 20.
is arranged so as to be swingable via a pivot shaft 26.

The cutoff valve 22 includes a solenoid 22a that is airtightly fixed to the back surface of the upper case 12, and a solenoid 22a that is airtightly fixed to the back surface of the upper case 12.
It consists of a valve body 22b that protrudes from the upper end of 2a and faces the nozzle 20.

The solenoid 22a is linked to a gas leak detector, a seismic sensor, etc., and is activated by the detection output of one or more of these.

The cam 24 is in contact with one end of a valve return rod 28 that passes through a shaft hole 18a formed diagonally in the lower part of the integration chamber 18 of the upper case 1 in an airtight manner and capable of advancing and retracting.

The externally protruding end of the return rod 28 is held by a return cover 30 that is diagonally connected to the lower part of the integration chamber 18, and is detachably connected to the outer periphery of the end of the return cover 30, as shown in detail in FIG. The operating state of the return rod 28 can be confirmed through the screw cap type transparent cap 32.

A return knob 34 made of a transparent material that supports the end of the return rod with a bearing is held within the return cover 30 so as to be movable forward and backward, and its protruding end is exposed to the end of the cap 32 together with the return rod 28. .
The return knob 3 is located inside the return cover 30.
A compression coil spring 36 is inserted that biases 4 toward the protruding side, that is, the retreating side.

Further, a second spring 40 is interposed between the return rod 28 and the return knob 34 and has one end in contact with an E-ring 38 coupled to the outer periphery of the return rod 28 and the other end in contact with the tip of the return knob 34. It is inserted.

Therefore, the return rod 28 is urged to the backward position together with the return knob 34 by the spring pressure of the spring 36, and is also urged forward by the relatively weak urging force of the second spring 40. This means that they are under pressure. It goes without saying that the spring pressure of the second spring 40 is set lower than the shutoff pressure of the valve body 22b.

In the above configuration, under normal conditions, the nozzle is open to allow gas to flow as shown in the figure.

In this state, the return rod 28 is connected to the second spring 4
The cam 24 is moved forward by the spring pressure of 0 to the nozzle 2.
0, the external protruding end of the return rod 28 separates from the display end on the cap 32 side, indicating the state in which gas is flowing.

If an abnormal situation occurs from this state, the shutoff valve 2
An exciting current is applied to the second solenoid 22a, and the valve body 22b protrudes, contacts the nozzle 20, closes it, and at the same time rotates the cam 24 counterclockwise.

As a result, the return rod 28 moves backward, and the return knob 3
4 and the cap 32, the rear end of the return rod 28 can be seen, and it can be confirmed that the return rod 28 has retreated.

When the flow path is to be released after the abnormality has been resolved, remove the cap 32 and press the return knob 34, the return rod 28 will move forward and the cam 24 will be connected to the nozzle 20.
As a result, the valve body 22b is retracted,
Open nozzle 20.

After that, when the return knob 34 is released, the return knob 34 projects to the end of the return cover 30. on the other hand,
Since the return rod 28 remains in the forward position due to the biasing force of the second spring 40, it is not visible in the display area, and it can be confirmed again that the flow path is open.

<<Effects>> As explained in detail using the embodiments above, in this device, when the return rod is located on the forward side, it is pushing the cam, and when the return rod is in the backward position In this case, the valve body protrudes and closes the flow path. Therefore, depending on these two conditions, the end of the return rod moves toward and away from the return knob, and the state of the return rod, that is, the open/closed state of the valve, can be confirmed from the outside through the return knob.

Therefore, with this invention, the current open/closed state of the shutoff valve can be immediately confirmed from the outside, and it can be immediately determined whether or not the shutoff position is at the gas meter when the gas supply is stopped, which saves time and effort. This eliminates the risk of slippage and erroneous operation.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a gas meter according to this invention, Fig. 2 is an exploded perspective view showing the component configuration of the part of the return rod protruding from the gas meter, and Fig. 3 is a part of a gas meter with a conventional gas opening/closing mechanism. It is a partial notch side view. 10...Gas meter, 12...Upper case, 12
a...Flange, 14...Lower case, 14a...
Flange, 16...Gas inlet port, 20...Nozzle, 22...Shutoff valve, 22b...Valve body, 24...
...Cam, 28...Valve return rod, 34...Return knob, 36...Compression coil spring, 40...Second spring.

Claims (1)

[Scope of utility model registration request] A lower case has a built-in membrane-type suction/drainage mechanism for sucking and exhausting gas, and an integration mechanism part is connected to the upper part of the lower case by a flange and converts the suction/drainage operation into rotation and displays the cumulative value. An upper case provided with a gas inlet and an exhaust port, a valve body of a shutoff valve disposed in the gas inlet side flow path and facing a nozzle provided in the flow path, and a valve body rotatable within the nozzle. A return cam for the valve body held in the valve body, a return rod that is movably abutted against the other end of the cam, and a transparent body mounted on the protruding end of the return rod on the front side of the upper case. a return knob; a spring that biases the return knob toward the protruding side; and a second spring that is located between the return knob and the return rod and biases the return bar to protrude toward the cam side. 1. A valve opening/closing mechanism for a gas meter with a built-in cutoff valve, characterized in that the operating state of the cutoff valve is displayed at the approach/separation position of a return rod with respect to an end face of the cutoff valve.