JPH0223810B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a gas meter that includes a built-in shutoff valve and that opens and returns the valve again.

(Prior art) In gas shutoff valves, the shutoff action can be easily performed by changing the direction of magnetic lines of force using an electromagnetic device, but in order to open and return the closed valve again, a relatively strong spring or the like is used to close the valve. For compression or large loads, it was impractical to use an electromagnetic device because it would require a large excitation coil and a large current, so the shutoff valve must be returned to the open position manually, i.e. by compressing the valve closing spring. The valve was then opened and held in that position by a permanent magnet within an electromagnetic device.

(Problem to be Solved by the Invention) Manual operation as described above is extremely inconvenient when the shutoff valve is located at a high place or in a remote location. This problem will be solved if we can obtain powerful power.

(Means for Solving the Problems) In order to solve the above problems, a shutoff valve built into a gas meter is characterized in that the driving force of a gas meter operated by gas pressure is utilized within the gas meter. . That is, a pilot valve is installed before the shutoff valve, and when the gas from this pilot valve reaches a certain pressure, the diaphragm of the gas meter starts operating and drives the counter and switching valve via the large metal, and this driving force is used to turn off the clutch. The valve opening cam is rotated through the valve opening cam to press and open the valve body of the shutoff valve, which is then returned to the open state and held by a permanent magnet.

(Example) Next, an example of the present invention shown in the drawings will be described in detail.

Reference numeral 1 denotes a counting chamber provided at the upper part of the gas meter, and a measuring chamber having a known diaphragm (not shown) is provided at the lower part of this chamber. It also consists of a drive system 6 that operates a counter (not shown) from the blade shaft 4, which operates in conjunction with the operation of the diaphragm in the metering chamber, through a large elbow 5, etc., and a switching valve 7, etc. that supplies and discharges gas to the diaphragm. There is.

In the present invention, a pinion 11 is formed on the shaft 10 of the gear crank 9 in a drive system extending from the blade shaft 4 to the switching valve 7, for example, as shown in the figure, by engaging with a drive crank pin 8 of the switching valve 7. This pinion 11 meshes with one rotary ring 18 of the clutch 12, and the cam drive shaft 15 of the system derailing 14 having the other pilot permanent magnet 12a is provided with an iron core 16, a pilot valve 17, and a return cam 18. . Also, the above iron core 16
A pilot excitation coil 19 is provided for the pilot, 20 is a return spring, 21 is a pilot valve closing spring, and a pilot gas passage 27 is connected to the gas inlet 2.
A pilot valve seat 26 is formed corresponding to the pilot valve 17. Further, a cutoff valve 22, a valve closing spring 23, and an electromagnetic device 24 are provided corresponding to the return cam 18.

(Function) The figure shows a state where gas is being supplied normally, and at this time a gas leak occurs, which is detected and the electromagnetic device 2
When the excitation coil 24a of No. 4 is energized, the attraction and holding surface 24c of the permanent magnet 24b is released, so the shutoff valve 22 comes into pressure contact with the shutoff valve seat 25 of the gas inlet 2 due to the accumulated force of the valve closing spring 23, and the gas is closed. is closed and kept safe. When repairing the above-mentioned gas leak or returning the closed shutoff valve 22 to open, the pilot excitation coil 19 is energized, the iron core 16 moves to the right (Figs. 1 and 2), and the clutch 12 is engaged and closed. A permanent magnet 12a in the clutch 12 firmly attracts the rotating and engaging wheels 13 and 14 in close proximity using a magnetic field, thereby ensuring engagement of the clutch 12 and cutting off the current in the pilot excitation coil 19.

With this operation, the pilot valve 17 disengages from the pilot valve seat 26 and opens the pilot gas passage 27. Therefore, gas is supplied in small amounts and sent from the switching valve 7 to the diaphragm in the metering chamber, and then Not only does the counter integration and the gas switching operation of the switching valve 7 take place from the drive system 6 via the armature 5, etc., but also the pinion 11 rotates, and this rotation is transmitted from the clutch 12 to the cam drive shaft 15, and the return spring 20
The return cam 18 rotates while accumulating force, and the shutoff valve 2
2 is pulled away from the shutoff valve seat 25 to open the valve, and the shutoff valve 22 is pressed and bonded by the force transmitted by the gas meter drive until the shutoff valve 22 is held in the open state by the magnetic field of the permanent magnet 24b in the vicinity of the suction holding surface 24c. When the clutch is pressed and the pressure is further increased and exceeds a certain limit, the clutch portion slips and the permanent magnet 12 for the pilot
Since a is separated, the attraction force is attenuated, the clutch 12 is disengaged, and the return cam 18 is returned to its original position by the return spring 20. At the same time, the pilot valve 17, which is integral with the cam drive shaft 15, is pressed against the pilot valve seat 26 by the pilot valve closing spring 21 and closed, completing the return.

In addition, in the above action, the rotation of the clutch 12,
The rotary ring 13 is made to be able to rotate slightly or completely with respect to the shaft 28 so that the engagement teeth of the engagement and disengagement wheels 13 and 14 do not differ, and in order to allow this rotation, the crank pin 8 It is preferable that the engagement with the gear crank 9 can be disengaged. Furthermore, in order to solve the above-mentioned relationship between the clutch 12 and the crank pin 8, the rotary ring 13 and the engaging/disengaging ring 14 are made to have magnetism of N and S of permanent magnets in the diametrical direction, and these N and S are made to have magnetism in both wheels. When the clutches 13 and 14 are aligned with each other, they are attracted to each other and the clutches are connected, and the cam drive shaft 1
Other embodiments may also be used in which the permanent magnets N, N, S, and S repel each other and release the clutch 12 when the permanent magnets N, N, S, and S are brought back toward each other.

(Effects of the Invention) If the cutoff valve is reset using an excitation coil, a current 10 to 20 times the cutoff current and energization time are required, and the coil must also be large. Since it uses the power to meter, it does not require large amounts of electricity and is safe because it only instantaneously supplies a small amount of current to the excitation coil for a small pilot, and the gas metering mechanism can be used even with a small amount of gas. The meter is movable and therefore has a reliable return operation, and is most preferred for remote control systems when home automation and home security systems are required in the recent New Media era.

[Brief explanation of drawings]

The figures show an embodiment of the device of the present invention; FIG. 1 is a cutaway front view of the main part of the gas meter, FIG. 2 is a partially detailed cutaway front view, and FIG. 3 is a side view of the return cam portion. 2 is a gas inlet, 4 is a blade shaft, 7 is a switching valve, 8 is a crank pin, 9 is a gear crank, 11 is a pinion, 12 is a clutch, 13 is a rotating ring, 14 is an engagement/disengagement ring, 15 is a cam drive shaft, 17 is a pilot valve, 1
8 is a return cam, 19 is a pilot excitation coil, 20 is a return spring, 22 is a cutoff valve, 24 is an electromagnetic device, 25 is a cutoff valve seat, 26 is a pilot valve seat,
27 is a pilot gas path, and 12a is a permanent magnet for the pilot.

Claims (1)

[Claims] 1. In a gas meter having a cutoff valve seat communicating with the gas inlet and correspondingly configured with an electromagnetic device and a cutoff valve, forming a pilot gas path having a pilot valve seat communicating with the gas inlet, Attach the pilot valve corresponding to the pilot valve seat to the cam drive shaft of the return cam of the shutoff valve, form an iron core on this shaft, position it within the pilot excitation coil, and attach the cam drive shaft to the drive shaft. When more torque is generated, the connecting force becomes weaker, and the connection is connected to the gas meter's counter and switching valve drive system via a clutch that separates the connection, and the return power for the shutoff valve is extracted from the gas meter's metering mechanism. A return device for a shutoff valve with a built-in gas meter, characterized by: