JPH0217062B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a gas meter with a shroud cutoff device that cuts off gas flow in the event of an earthquake or gas leak, for example.

[Technical background of the invention and its problems]

Earthquake sensors that detect earthquakes and gas leak alarms that detect gas leaks are known. In addition, a safety device has been put into practical use that combines the above-mentioned seismic sensor, gas leak alarm, and a sintering device, and activates the sintering device in the event of an earthquake or gas leak, thereby cutting off the flow of gas. has been done.

However, the conventional shredder device is provided in the middle of a gas pipe connecting a gas meter and a gas appliance. In addition, earthquake sensors and gas leak alarms are installed on indoor walls near gas appliances.
Then, the above-mentioned earthquake sensor, gas leak alarm, and sheath cutoff device are connected electrically or mechanically by wire, and the sheath cutoff device is activated in the event of an emergency such as an earthquake or a gas leak. The gas flow has been cut off.

Therefore, it is necessary to install the shredder to the gas pipe, and it also needs to be installed midway between the gas meter and the gas appliance.
The drawback is that the installation location is also restricted.

Therefore, it is conceivable to provide a shear breaker inside the gas meter, combine this shear breaker with the above-mentioned earthquake sensor or gas leak alarm, and disconnect the shear breaker in an emergency. However, gas meters have recently been downsized due to demands for reduced installation space and cost reduction, and their components are packed tightly together inside the case body. Therefore, in order to incorporate a shear cutter into this type of gas meter,
It is necessary to change the design of a part or the whole of the case body, and the gas meter becomes larger, which does not satisfy the original requirements and causes an increase in costs, making it unsuitable for practical use.

[Purpose of the invention]

This invention was made in view of the above-mentioned circumstances, and its purpose is to enable a shredder device to be incorporated into the gas meter body without significantly changing the configuration of the gas meter body, and to improve the performance of large-sized gas meters. It is an object of the present invention to provide a gas meter with a shroud breaker that is suitable for practical use without causing any increase in cost or increase in cost.

[Summary of the invention]

In this invention, a valve seat is provided at the gas inlet of an upper case that houses a crank mechanism, a valve mechanism, etc., and a valve body and a self-holding solenoid for driving this valve body are provided opposite to this valve seat. By bending the large elbow that constitutes the shearing device and forming the above-mentioned crank mechanism to prevent interference with the shearing device, the shearing device can be installed while making effective use of a narrow space. That's what I did.

[Embodiments of the invention]

The present invention will be described below based on an embodiment shown in the drawings. Reference numeral 1 in FIGS. 1 and 2 is the case body of the gas meter, which is composed of a lower case 2 and an upper case 3. A pair of metering chambers 4 are provided within the lower case 2, and a metering membrane 5 that reciprocates by gas pressure is mounted within these metering chambers 4. These metering membranes 5 are provided with rotating blades 7 via membrane plates 6, and the rotating blades 7 are fixed to blade shafts 8, 8, respectively. These wing shafts 8, 8 are provided vertically in the lower case 2, and the upper ends of these wing shafts 8, 8 penetrate into the upper case 3 through a partition plate 9 provided at the upper part of the lower case 2. ing. These wing shafts 8, 8 are spaced apart and installed parallel to each other, and the base ends of large armrests 11, 11 constituting the crank mechanism 10 are fixed to the upper ends thereof. These large armrests 11, 11 are bent outward in a substantially arc shape to form a space 12, and intersect with each other at their midpoints. Further, the tips of the large armrests 11, 11 are connected to a rotating plate 14 via small armrests 13, 13, and the rotating plate 14 is configured to rotate around a crankshaft 15. Further, the crankshaft 15 is linked to an integrating mechanism 16 provided on the front surface of the upper case 3, and the rotary plate 14 is linked to a valve mechanism 17 inside the upper case 3. Inside the upper case 3 configured in this way is a gas flow passage 18.
A gas inlet 19 is provided on one side of the upper surface of the upper case 3, and a gas outlet 20 is provided on the other side. A shear cutting device 21, which will be described later, is installed in the upper case 3 facing the gas inlet 19, that is, in the space 12 between the large armrests 11.

This shredding device 21 is constructed as shown in FIGS. 3 to 5. That is, 22 is a valve seat fixed to the gas inlet 19. This valve seat 22
A mounting plate 24 fixed by mounting bolts 23, 23 is installed at the lower part opposite to the mounting plate 24. A valve body 25 facing the valve seat 22 is attached to the upper part of the mounting plate 24, and a self-holding solenoid 26 for driving the valve element 25 is attached to the lower part. The valve body 25 is formed by a disk-shaped valve seat 28 mounted on a support disk 27. This valve seat 28 is made of an elastic material such as rubber or synthetic resin, and is adapted to come into close contact with the valve seat 22. moreover,
A coil spring 29 is interposed between the valve body 25 and the mounting plate 24, and constantly urges the valve body 25 toward the valve seat 22. The self-holding solenoid 26 also includes a coil 31 wound around a coil bobbin 30 and a yoke 3 surrounding the coil 31.
2. It is composed of a plunger 33 slidably provided within the coil bobbin 30 and a magnet 35 fixed to the bottom of the yoke 32 via a core piece 34. Furthermore, this plunger 3
3 is swingably connected to the valve body 25 via a ball joint 36. and,
In this self-holding solenoid 26, when the coil 31 is not energized, the plunger 33 overcomes the coil spring 29 and is attracted to the magnet 35, and the valve body 25 is separated from the valve seat 22 and is in the open state. When the coil spring 29 is momentarily energized to apply a reverse magnetic field, the restoring force of the coil spring 29 presses the valve body 25 against the valve seat 22 and holds the valve in the closed state. Note that 37, 37 are terminals electrically connected to the coil 31.

Further, the shearing device 21 is provided with a return operation mechanism 38 for manually returning the valve body 25 to the open state. This return operation mechanism 38
The operating shaft 39 is rotatably inserted into a through hole 40 that extends through the upper case 3 in the front-rear direction.
One end of the operating shaft 39 protrudes inward in a direction perpendicular to the gas inlet 19, and a return cam 41 is fixed to its tip. The cam surface 42 of the return cam 41 is formed into an involete curve, and rotates downward as the operating shaft 39 rotates, protrudes downward from the valve seat 22 and closes the valve seat 2.
The valve body 25 that is in close contact with the coil spring 2
It is designed so that it can be pushed down against the restoring force of 9. In this case, since the cam surface 42 of the return cam 41 has an involute curve, it is always in contact with the center of the valve body 25, that is, the axis of the support disk 27 corresponding to the ball joint 36. The other end of the operating shaft 39 extends to a counter mount 43 formed at the front of the upper case 3.
3 has a recess 4 in which the end of the operating shaft 39 is accommodated.
4 is formed. A gasket 45 for airtightly sealing the operating shaft 39 and a mainspring spring 46 for returning the operating shaft 39 in one direction, that is, returning the return cam 41 into the gas inlet 19, are provided in the recess 44. Furthermore, a terminal box 47 is provided on the counter mounting base 43, and this terminal box 4
7 is the terminal 3 of the self-holding solenoid 26.
A terminal pin 48 is provided to electrically connect to the terminals 7 and 37. The counter mounting base 43 is fitted with a counter cover 49, and the counter cover 49 is provided with an operation port 50 for operating the operation shaft 39. Note that 51 is a cap that closes the operating port 50, and 52 is a cable that connects to the terminal pin 48. and,
This cable 52 is connected to an abnormality detector (not shown) such as a seismic sensor for detecting an earthquake or a gas leak alarm for detecting a gas leak, and is connected to a self-holding type by the output signal from the abnormality detector. It has a function of instantaneously energizing the coil 31 of the solenoid 26.

Next, the operation of the gas meter with a shingle breaker configured as described above will be explained. First, in normal use, the coil 31 of the self-holding solenoid 26 of the shearing device 21 is in a non-energized state, so the plunger 33 is connected to the coil spring 29.
It overcomes the restoring force and is attracted to the magnet 35. Therefore, the valve body 25 is spaced apart from the valve seat 22 and in the open state, and gas flows through the gas inlet 19→
The gas flows in the order of gas flow path 18 → valve mechanism 17 → metering chamber 4 → valve mechanism 17 → gas outlet 20. The gas pressure flowing through the metering chamber 4 causes the metering membrane 5 to reciprocate, and this movement is transmitted to the blade shafts 8, 8 via the rotary blades 7. The rotational movement of the wing shafts 8, 8 is linked to the integrating mechanism 16 and the valve mechanism 17 via the crank mechanism 10 including the large armrests 11, 11.
The gas flow rate is instructed to the integrating mechanism 16.

In this way, in normal use, the abnormality detector detects an abnormality and the output signal is cut off by the device 21.
When the magnetic field is input to the self-holding solenoid 26, that is, when the coil 31 is instantaneously energized and a reverse magnetic field is applied, the attraction of the magnet 35 is released.
Therefore, the plunger 33 protrudes from the coil bobbin 30 due to the restoring force of the coil spring 29, and the valve body 25 is pressed against the valve seat 22 to close the valve. The restoring force of the coil spring 29 holds the valve in the closed state, and gas that attempts to flow into the gas meter from the gas inlet 19 is immediately cut off, thereby preventing gas leakage in the event of an abnormality. can.

Further, when the abnormal condition is canceled and the gas appliance is to be used again, the cap 51 is removed and the operating port 50 is opened. When the operating shaft 39 is rotated against the restoring force of the mainspring spring 46 using, for example, a screwdriver, the return cam 41 is rotationally displaced within the gas inlet 19 . Therefore,
The cam surface 42 of the return cam 41 abuts the center of the upper surface of the valve body 25, that is, the axis of the support disk 27. When the return cam 41 is further rotated, the valve body 25 is pushed down against the restoring force of the coil spring 29, separated from the valve seat 22, and moved toward the plunger 3.
3 is attracted to the magnet 35. Therefore, the valve body 25 is held in an open state, and when the driver is removed from the operating shaft 39, the operating shaft 39 is moved by the mainspring spring 46.
The restoring force causes the return cam 41 to rotate in the opposite direction to the operating direction, and the return cam 41 is rotated upward and returned to the inside of the gas inlet 19 .

In the above-mentioned embodiment, the shunt disconnection device 21 is activated by an output signal from an abnormality detector such as a seismic sensor or a gas leak alarm, but if the gas flow rate deviates from a specified range, It can also be applied to automatically cut off the gas supply for safety reasons when in use.

〔Effect of the invention〕

As explained above, this invention utilizes the dead space in the upper case of the gas meter to install the shearing device, so it can be incorporated into the case of a conventional gas meter without changing the design. Since the gas meter only needs to be replaced, it is practical and does not increase the size or cost of the gas meter. Furthermore, since the gas inflow port of the gas meter is cut off, the inside of the gas meter will not be filled with gas in the event of an abnormality, resulting in an effect of safety.

[Brief explanation of drawings]

The drawings show one embodiment of the invention.
The figure is a vertical front view of the gas meter, Figure 2 is a plan view with the upper case removed, Figure 3 is a vertical side view showing the relationship between the cutter and the gas inlet, and Figure 4 is Figure 3. 5 is a longitudinal sectional front view of the self-holding solenoid. 2... Lower case, 3... Upper case, 4... Measuring chamber, 5... Measuring membrane, 8... Wing shaft, 10... Crank mechanism, 11... Large armrest, 16... Integrating mechanism, 1
7... Valve mechanism, 19... Gas inlet, 20...
...Gas outlet, 21...Shrinking device, 22...Valve seat, 25...Valve body, 26...Self-holding solenoid.

Claims (1)

[Claims] 1. A lower case forming a metering chamber having a pair of metering membranes that reciprocate by gas pressure, an upper case provided on the upper part of the lower case and having a gas inlet and a gas outlet on the upper surface; A pair of blade shafts provided in the upper case and converting the reciprocating motion of the metering membrane into rotational motion, and a crank mechanism that works in conjunction with these blade shafts to convert the rotational motion into rotational motion and transmits it to the integrating mechanism and the valve mechanism. In a gas meter consisting of
A valve seat is provided at the gas inlet of the upper case, and a valve element that can move toward and away from the valve seat and a self-holding solenoid that drives the valve element are provided in the upper case opposite to the valve seat. A large elbow that constitutes the shear cutting device and that constitutes the crank mechanism is bent outward in a horizontal plane, and the shear cutting device is installed in the space formed by this bent portion. Gas meter with cut-off device.