JPS623888B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a sliding valve type gas meter.

As shown in Figures 1 to 4 for a rotary valve type gas meter, a sliding valve type gas meter has a valve chamber 2 communicating with a gas inlet 1, an exhaust passage 4 communicating with a gas outlet 3, and a gas inlet.・Both the capacity chamber 5 whose volume changes within a certain range in response to exit, and the exhaust passage opening 6 and metering chamber opening 7 that communicate with the exhaust passage 4 and metering chamber 5 and open toward the valve chamber 2. A valve seat 8 that surrounds each other in isolation, and a valve seat 8 that is in the valve chamber 2 and slides in contact with the valve seat 8 so that the metering chamber opening 7 communicates directly with the valve chamber 2.
and a valve body 9 that alternately and alternatively switches between the valve body 9 and the exhaust passage 4 indirectly, and a valve body 9 that obtains power from the volume change of the metering chamber 5 and switches the communication destination near each end of the volume change. This is a gas meter having a valve regulating device 10 to be driven. This point is exactly the same for the reciprocating valve type.

This type of sliding valve type gas meter is currently the mainstream gas meter for city gas.

Typically, city gas is supplied to gas appliances at each consumer via a manual gas tank that is connected to the terminal of a supply pipe and is normally open, the slide valve type gas meter, and piping.

Recently, for security reasons, gas appliances are being used to maintain the combustion of gas when the supply pressure in the supply pipes drops due to sudden accidents such as power supply stoppages during earthquakes or power outages, or breakage of supply pipes. A shutoff device that automatically shuts off the gas flow in the middle of the piping before the pressure drops to the lowest possible pressure, and a shutoff device that automatically shuts off the gas flow at each customer independent of the supply source in the event of an earthquake with high vibrations. Proposed.

However, all conventional shutoff devices were separate from the gas meter. For this reason, installation requires a separate space, and the existing piping also requires modification work, and installation may not be possible due to lack of space, resulting in customers using gas for long periods of time. There were drawbacks such as forced suspension.

In view of this, the present invention is the above-mentioned sliding valve type gas meter, which utilizes its characteristics to also function as a gas shutoff device, and thereby provides the above-mentioned sliding valve type gas meter, compared to the case where a separate shutoff device is installed. The aim is to realize a system that significantly alleviates the drawbacks.

In the above-mentioned sliding valve type gas meter as illustrated in each of Figs. 1 to 4, the present invention allows the normal operation of the valve regulating device 10 as shown in the released state in Fig. 4 and the restrained state in Fig. 5. A restraining device 11 is provided that can take two states: a release state that allows the operation and a restraining state that inhibits the operation, and by switching the state of the restraining device 11, switching between gas flow and interruption from the inlet 1 to the outlet 3 is provided. This is a gas meter that can also be used as a shutoff device.

This embodiment is applied to a four-chamber rotary valve type sliding valve type gas meter. As the measuring chamber 5, 2
The movable membranes 12-1, 2, 12-
A total of 4 measuring chambers 5-1, 5-2, 5- divided into 2 sets of 2 and 4 measuring chambers 5-1, 5-2, 5- whose volumes change reciprocally.
There are 3,5-4. As the measuring chamber opening 7, 7-1, 7-3 and 7-2, 7-4 communicating with each measuring chamber 5-1, 5-2, 5-3, 5-4 are exhausted in this order. A valve seat 8 is arranged surrounding each passage opening 6 in a generally circular manner, and surrounding each opening is a valve seat 8. The valve body 9 rotates on the valve seat 8 concentrically with the circle to perform a predetermined switching operation.

The valve regulating device 10 includes movable membranes 12-1, 2, 12-
From the movable parts 3 and 4, membrane arms 13-1, 2, 13-
3, 4, Membrane axis 14-1, 2, 14-3, 4, Hikindai 15-1, 2, 15-3, 4, Higukin small 16-
1, 2, 16 - 3, 4, an eccentric valve drive pin 2 that transmits power to the crankshaft 19 via the crank pin 17 and the crank arm 18 and is integral with the crankshaft 19;
0 directly drives the valve bodies 9-1, 2, 9-3, and 4.

Then, as shown in FIG.
A stopping end 22 is provided at the upper end thereof and extends upward.

As the restraint device 11, a restraining pawl 23 is provided directly above the passing position of the restraining end 22 as the crankshaft 19 rotates, and is movable up and down.The restraining pawl 23 does not interfere with the restraining end 22 in the raised position and is a valve regulator. 10 is in a released state that allows normal operation, but in the lowered position, it is in a restrained state that inhibits the movement.

In the embodiment shown in FIG. 5, the stop pawl 23 is biased by its own weight toward the lowered position shown by the straight line, and the drive shaft 23
4 toward the raised position shown by the solid line.

In the lowered position, as shown in FIG. 6, the normal operation of the valve adjusting device 10 is stopped, the operation of the valve body 9 and the metering chamber 5 is stopped, and the gas flow from the valve chamber 2 to the exhaust path 4 is stopped. is blocked by the contact portion between the valve body 9 and the valve seat 8. Due to this contact, direct communication between the valve chamber 2 and the exhaust passage opening 6 is always blocked, and the metering chamber opening 7 is prevented from communicating with both the valve chamber 2 and the exhaust passage opening 6 at the same time. , movable membrane 12
This is because the measuring chambers -1, 2, 12-3, and 4 are always isolated from each other against the pressure difference. The contact pressure of the contact portion is generated by the pressure difference between the upper and lower sides of the valve body 9 in the area surrounded by the contact portion while isolating the pressure portion of the valve chamber 2 and the pressure portion of the exhaust passage 4. Since it is a force, the entrance 1 associated with the interruption
Due to the elimination of the pressure loss before and after the outlet 3, the barrier properties increase as the pressure difference increases. Therefore,
By adding the restraint device 11 to the sliding valve type gas meter, it is possible to exhibit the same shutoff function as when a separate shutoff device is provided.

Moreover, the increase in the occupied space due to the addition of the restraining device 11 is small and almost no changes are required to the piping associated with the gas meter, so that the above-mentioned objective is fully achieved.

The embodiments shown in FIGS. 5 and 6 are gas meters having a shutoff function that automatically shuts off gas flow at a constant pressure when the supply pressure decreases.

In the released state shown in FIG. 5, the working pressure chamber 2
5 communicates with the valve chamber 12 via a communication passage 26, and when the supply pressure is sufficiently high, the operating membrane 27 rises against the biasing means 28 due to the differential pressure with the upper atmospheric pressure. , the drive shaft 24 maintains the stop claw 23 as the stop device 11 in the raised position shown by the solid line in the figure, that is, in the released state, and the valve regulating device 10 freely rotates in the forward direction.

However, as the supply pressure decreases, the drive shaft 24 gradually descends, and when it reaches a certain value, the attractive magnetic force between the magnetic plate 29 and the permanent magnet 30 acts, and as shown in FIG. 31b closes the upstream valve seat 31a, and at the same time separates the downstream valve body 33b from the downstream valve seat 33a via the transmission lever 32, thereby communicating the operating pressure chamber 25 with the exhaust path 4. At the same time, the drive shaft 24 descends, and the restraint device 11 enters the restraint state.

Even if the supply pressure is restored thereafter, the internal pressure of the working pressure chamber 25 is equal to the pressure of the outlet 3, so the restraining device 11 continues to remain in the restrained state.

After the supply pressure is restored, when the cover 34 is removed and the assembly screw 35 is slightly pushed down, the return communication valve body 36b fixed to the drive shaft 24 separates from the return communication valve seat 36a forming the lower surface of the upstream valve boss 37. The operating pressure chamber 25 has an inlet via a gap 38 between the drive shaft 24 and the upstream valve boss 37, between the return communication valve seat 36a and the return communication valve body 36b, the communication passage 26, and the valve chamber 2. 1, and gas gradually flows in. At this time, if there is a leakage greater than this inflow downstream of the exhaust path 4, the internal pressure of the working pressure chamber 25 will not rise and the restraint device 11 will continue to be in the restraint state, but if there is no such leakage, The internal pressure of the working pressure chamber 25 gradually rises, and finally the restraint device 11 is released and returns to the state shown in FIG. 5.

In this way, the embodiments shown in Figures 5 and 6 have the function and effect of a gas meter that doubles as an automatic shutoff for safety when the supply pressure drops, and furthermore, even after the supply pressure is restored, specific operations must be performed. Since the supply will not be restarted if this happens, the risk of unburned gas being released can be avoided.

Although the above embodiment is applied to a gas meter having a rotary valve, the same operation and effect can be obtained even if the present invention is applied to a gas meter having a reciprocating valve.

[Brief explanation of the drawing]

1 to 4 are a front cross-sectional view, a plan view taken along arrow A-A in FIG. 1, and an upper part of FIG. B-B with only the outer box removed
They are an arrow plan view and a CC arrow plan view. 5 and 6 are sectional views of only the upper part of an embodiment of the present invention, with FIG. 5 showing the restraining device in its released state and FIG. 6 showing its restrained state. 1...Inlet, 2...Valve seat, 3...Outlet, 4...
Exhaust path, 5...Measuring chamber, 6...Exhaust path opening, 7...
...Measuring chamber opening, 8... Valve seat, 9... Valve body, 10...
...Restraint device, 11...Restraint device.

Claims (1)

[Claims] 1 A valve chamber 2 that communicates with the gas inlet 1, an exhaust passage 4 that communicates with the gas outlet 3, a metering chamber 5 whose volume changes within a certain range according to the entry and exit of gas, and an exhaust passage 4 and a metering chamber 5. A valve seat 8 that surrounds both the exhaust passage opening 6 and the metering chamber opening 7 which communicate with each of the chambers 5 and open toward the valve chamber 2 in a manner that isolates them from each other; The valve body 9 slides and alternately and selectively switches the communication destination of the metering chamber opening 7 directly to the valve chamber 2 and indirectly to the exhaust path 4, and the valve body 9 obtains power from the change in volume of the metering chamber 5. In a sliding valve type gas meter having a valve regulating device 10 that drives the valve body 9 so that switching of the communication destination occurs near each terminal of volume change, the release state that allows the valve regulating device 10 to operate normally and its operation are A restraining device 11 is provided which can take two states, a restraining state and a restraining state, and the restraining device 1
1. A gas meter for shutting off and shutting off, characterized in that by switching the state of No. 1, gas flow from an inlet 1 to an outlet 3 can be switched between flowing and shutting off.