JPS5863813A - Gas meter provided with interrupting mechanism - Google Patents

Abstract

PURPOSE:To simplify an interrupting mechanism and to smooth restoring operation by providing a gas meter with a detaining mechanism checking reciprocating or rotational motion by an interrupting signal and a restoring mechanism releasing the detaining mechanism. CONSTITUTION:Since a permanent magnet 24 for a detaining lever 22 is attracted by an iron 26, a detaining part 23 is separated by a crank arm 8' and the rotation of crank arm 8' due to the reciprocating motion of a measuring film 2 is protected at a mormal time, gas is sent out from a gas meter while being measured. At an abnormal time, current flows into an electromagnet in a moment, a driving part 27 is separated from an iron core 26 and a detaining part 23 is projected, so that the rotation of the crank arm 8' is stopped and gas feeding is interrupted. At the time of restoration, a restoring cam 29 is rotated clockwise by the clockwise rotation of an operating lever 32, a driving part 27 is pushed up and the permanent magnet 24 is again attracted by the iron core 26, restoring the magnet 24 to the normal position. Consequently the interrupting mechanism of rotational motion is simplified and its restoring operation is also smoothed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas meter having a mechanism for shutting off gas when the gas flow rate deviates from a specified range or in an emergency.

In indoor gas piping, gas is automatically shut off for safety reasons, such as in emergencies such as earthquakes, power outages, leaks of unburned gas, or when the gas flow rate is outside the specified range. An automatic gas shutoff device has been proposed. As a means of this, it is common to install a solenoid valve in the gas pipe near the gas meter, and operate the solenoid valve in response to a cutoff signal from a gas leak detector, earthquake sensor, gas usage status monitor, etc. On the other hand, a method has also been proposed in which a shutoff valve is built into the gas meter and the gas meter is operated by a shutoff signal. In the former case, solenoid valves are expensive, and it takes a lot of work to install them in piping, and there may be problems with the installation location, especially in the case of existing piping.
In the latter case, a shutoff valve device is further incorporated into the complicated gas meter mechanism, which makes the gas meter even more complicated, and the gas meter becomes larger.

In view of this point, the present invention has three round trips inside the gas meter.

The shutoff mechanism is simplified by providing a locking mechanism that blocks movement or rotational movement by a shutoff signal and a return mechanism that releases the locking mechanism, and also eliminates the IE force difference of the measuring membrane of the gas meter during the return operation. Therefore, a mechanism is provided that makes the return operation smooth, such as eliminating the impact movement at the time of return and reducing the return operation force.

The invention will be described in detail below based on examples.

In Figures 1 and 2, 1 is a main body, 2 is a measuring membrane made of a gono, a diaphragm, etc. inserted in the measuring chamber 3 in the main body, and the measuring membrane 2 is a measuring membrane in Figure 2. The chamber 3 is divided into front and rear sections, and the difference in pressure between the gases entering the chamber 3 causes a back and forth movement; The rotational vibration is transmitted to the integrally formed large armrest 6. There is another metering chamber a1 at the rear of the main body 1 in Fig. 2, and in the same way, the movement of the other set of metering membranes is transmitted as the coaxial rocking of the large armrest 6'. The rotational swing of 6 and 6' is small old gold 7
, 7', the crank arm 8 swings at a constant angle in its rotational direction, which can be said to be the rotational movement of the crank arm 8. The rotation of the crank arm 8 is similar to the rotation of the crank arm 8' with 9 as the axis, and the rotation of the crank arm 9 is as follows.
One side is decelerated through the worm gear box 1° and the rotation of the metering transmission shaft 11 is transmitted to the metering mechanism.
Slide pulp 14 that opens and closes gas flowing into and out of the measuring chambers 3 and 3' (back side not shown) through 3'.
, 14' are oscillated about shafts 15, 15', 16, 16' is the valve port thereof, and 17 is the outlet of the gas body. That is, the membrane movement of the autopsy membrane is converted into rotational movement, and the rotational movement is transmitted to the metering mechanism and the slide valve section, which are integrally formed in the main body 1. 18 is the upper body of the main body 1, which serves as a case for the rotating mechanism section, etc., and the gas population 19. In addition to the gas outlet 20, a metering unit case 21 in which a metering mechanism is housed is integrally formed.

Next, 22 is a locking lever of a locking mechanism, one end of which is integrally provided with a locking portion 23 capable of stopping the rotation of the crank arm 8', and the other end of which is integrally provided with a permanent magnet 24. --- has a driving part 27 adsorbed to the iron core 26 of one magnet 25,
It swings around the metering transmission 111111. The electromagnet 25 is provided in the upper body 18. Reference numeral 28 denotes an operating shaft of a return mechanism that releases the state in which rotation of the crank arm 8' is blocked by the locking lever.
] Valve operating cam 31 that operates the valve opening lever 30 to
The operating lever 32 is rotated to the right in the figure in the return operating direction, and the operating shaft is always biased in the counterclockwise direction by a spring (not shown) and locked by a stopper. Reference numeral 33 denotes a valve opening portion of a valve opening lever 3o that can lift the slide pulp via a bin 34 provided on the side of the slide pulp 14 and open the valve opening.
0 is always locked in the right rotation direction by its own weight around the axis 11 of the axis 111, and the other end is brought into contact with the lower side of the valve operating cam 31 by its driving portion 35.

The present invention has the above configuration, and the operation will be explained in FIG.
This will be explained with reference to FIG. 2 and FIGS. 3 and 46t, which enlarge the main parts. Under normal conditions, the gas flow enters the upper body 18 through the inlet 19, enters the respective metering chambers 3 and 3' through the valve ports 16 and 16', and the metering membrane 2, due to the pressure difference between the inlet pressure and the outlet 17. 2/ (on the back side, not shown) moves back and forth, and once the gas enters the metering chamber, it passes through the valve ports 16, 16.
It is pushed out to the main body outlet 17 through a passage (not shown) formed on the valve side of the slide pulp 14 and slide pulp 14, 14', and is supplied to the indoor gas supply port from the outlet 20. On the other hand, the movement of the instrument membrane is the wing shaft 5.5', the large armrest 6.6', and the small armrest 7,7'.
The rotational motion of the crank arm 8 is converted through the rotational movement of the crank arm 8. One side of this rotation is the shaft 9, the worm gear, and the metering transmission shaft 11.
The gas usage amount is displayed through the metering mechanism, and the crankshaft 12 rotates around the shaft 9, and the slide pulp 14, 1 is transmitted through the connecting plates 13, 13'.
4', the valve ports 16 and 16' slide open and close to move in and out of the gas metering chambers 3 and 3', thereby continuing the operation. At this time, the electromagnet 25 and the non-energized 26 are simply an iron core, and the permanent magnet 24 of the locking lever 22 is attracted to the iron core, and the locking portion 23 escapes from the rotation range of the beam 7 - the crank arm 8', and the crank arm 8' can rotate freely. That is, it is in the state shown by the solid line in FIG. In fact, the valve opening lever 30 is locked in the clockwise rotation direction due to the balance of its own weight, and the valve opening [-] portion 33 is also in a state away from the bin 34, so that it does not interfere with the operation of the slide pulp.

Next, when an abnormality occurs, for example when the gas flow rate deviates from the specified range (
When it is necessary to shut off the gas in an emergency due to a sensor or microcomputer (not shown) or a gas leak detector or earthquake sensor, a single current flows through the electromagnet 25 (41-1 iron core 26). Permanent magnet 2 in the magnetic circuit consisting of
40 repulsion magnetic field causes the giant drive section 27 to detach from the iron core 26 in an instant, and due to the weight of the locking lever 22 in the direction of the drive section, it rotates counterclockwise around the metering transmission shaft 11, causing the return cam 29 to move in the direction of the smaller diameter. At this time, the locking portion 23 rotates to the left and projects into the rotation range of the crank arm 8', and finally stops the rotation of the crank arm 8'. Fourth
The dashed line in the figure shows this state. By stopping the crank arm 8', the crank 13.13' and the slide pulp 14
, 14' stops, the gas supply to each measuring chamber becomes correct, the operation of the dividing membrane also becomes correct, and the gas supply starts from slide valves 14 and 14' and valve ports 16 and 16'. It will be stopped at certain points to ensure safety. When safety is ensured and the return is made, the return cam 29 is similarly rotated clockwise by a half-turn to the right of the operating lever 32, pushing up the driving portion 27 of the locking lever 22, and the permanent magnet 24 is attracted to the iron core 26 again. The locking part 23 escapes from the rotation range of the crank arm 8', and the connection between the locking part 23 and the crank arm 8' is released, and the crank arm 8' is free to rotate and the operation begins. The flow is resumed, but at this time, that is, when the locking lever 22 is returned, the crank arm 8 acting on the locking portion 23
A considerable amount of force is required to overcome the locking force of '' and release the engagement.

The force acting on the locking part is originally the force that stops the metering membrane, and the metering membrane has gas inlet pressure and outlet pressure (mostly). In addition, immediately after the lock is released, the operation opens with an impact movement.

Therefore, the characteristic operation of the present invention will be explained. 1. When the operating lever 32 is rotated, the rotation range is from 0 to 9 oot because the large diameter direction of the return cam 29 is downward at the operating point Sfl and becomes horizontal to the left at 900 rotations. This has no relation to the return operation of the locking lever 22. The 900 rotation state is shown by the dashed line in FIG. On the other hand, the valve operating cam 3 related to the pressure relief device
1 is the state shown by the solid line in FIG. 3 before the return operation, and if the cam is rotated 900 degrees clockwise from this point, the direction of the larger diameter of the cam will already displace the driving part 35 of the valve opening lever 30 in one direction. , the valve opening lever 30 rotates counterclockwise around the metering transmission shaft 11, pushes the bottle 34 with the valve opening 33 at the tip of the lever 110, and slides the pulp 14 from the valve seat of the valve opening 16. Lift and open the valve.

When the valve is opened, there is no differential pressure between the gas inlet pressure and the main body outlet 17, so that the locking portion 23 by the crank arm 8'
The locking force will no longer act on it, and on the contrary, a slight reverse rotational force will occur. This state is shown by the dashed line in FIG. 3, and in this state, the V operation lever 32 is
By being rotated to 0, the valve operating cam 31 continues to act on the valve opening lever 30, and the slide valve continues to keep the valve open, and the return cam 29 rotates the locking lever 22ff clockwise with a slight force to lock it. The stop portion 23 escapes from the rotation range of the crank arm 8' and easily returns to the state shown by the solid line in FIG. and crank arm 8'
begins to rotate, the operated lever 32 which was bent returns to its original state by the reversing spring, and both cams similarly return to their pre-operated state. At the same time, the valve opening lever 30 also rotates clockwise and the slide valve returns to its normal position. It will return and normal operation will continue. As shown in 2 below, in this embodiment, a valve opening lever 3o is added to the locking lever mechanism, and a simple key 11 is added.
- The return operation can be performed extremely smoothly by a simple and reliable method of opening the slide valve in combination with a one-way mechanism.

Next, another embodiment of the pressure difference eliminating means will be described.

FIG. 5 is a cross-sectional view of a gas meter as an example of a shutoff mechanism, in which the locking mechanism and the like are omitted, and only the pressure difference eliminating means is shown. 36 ← M (Section that divides chamber 3: A connection that communicates each chamber partitioned by II 2) 11' 1 hole, each chamber has a slide valve and valve port (not shown) The communication hole 36 also serves as a through hole for the slide valve section leading from the inlet 19 to the outlet 1.
A valve body 3 is provided in the middle of the hole 36 and is always closed by a spring. The valve body 37 can be opened and closed by a valve operating rod 38 from outside the communication hole.

Furthermore, the valve operating rod 38 is movable by the valve operating cam 39'J1.
The operation of the valve operating cam 39 is locked.
It is fixed to the operating shaft 28 coaxially with tl. To explain only the operation when the gas meter is restored after shutting off during an abnormality, when the cam operates and the operating shaft 28 rotates by 90 degrees from O, the valve operating cam 39 acts and the valve operating rod 38
The valve body 37 is opened through the opening, and the communication hole 36 is communicated with the valve body 37 . The pressure difference between the front and rear of the can membrane 2 is eliminated by the communication hole.
At the same time, as mentioned above, the pressure difference after the metering membrane 2 via the outlet side is also eliminated, the locking force of the locking portion (not shown) is released, and the low torque at 1800-i from 90° of the operating shaft 28 is released. The locking lever can be easily returned to its original position by rotating the lever. The bypass hole in this system has the same effect no matter where it is placed on the meter in relation to the return method, and has the advantage of increasing the degree of freedom in installation.

Note that the locking means, locking release means, pressure difference eliminating means, etc. are not limited to the configurations of the above embodiments.

As described in -1- below, the present invention provides a complete gas meter with a shut-off mechanism that can reliably shut off gas using a simple means in the event of an abnormality, and that can be easily reset after safety has been confirmed. It has the following effects:

3. 1) Without changing the original structure of the gas meter (2), the shutoff/return mechanism is internally installed within the meter using simple means, and there is no risk of failure and is highly reliable. Furthermore, it is a quick and simple means to eliminate the pressure difference acting on the tear membrane during the return operation, which is a feature of the present invention. In addition to being able to perform a return operation, there is no impact movement or return operation, and it has excellent safety, durability, and reliability.

2 Regarding the locking mechanism, the purpose can be achieved with a simple locking lever, and it provides a shutoff mechanism with reliable operation and simple structure.In addition, an external solenoid valve can be installed as an emergency shutoff device. There is no need to do this, and it is superior in terms of ease of construction as it adds lv to existing piping.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a gas meter with a shutoff mechanism of the present invention, FIG. 2 is a partial front view of the same gas meter, and FIG.・・・・・・Drying membrane, 6・・・・ Wing axis, 6, 6′・・・・Dog elbow metal, 7,7′・・・・・Kojirigane, 8,8 '・・・・・・
・Crank arm, 11... Metering transmission shaft, 12
・・・・・・Crankshaft, 13, 13'・・・・・・
Connecting plate, 14.14'...Slide valve, 1
6, 16'... Valve port, 22... Locking lever, 24... Permanent magnet, 25...
Electromagnet, 26... Iron core, 28... Operating shaft, 29... Return cam, 30... Valve opening lever, 卍... Valve Operating cam, 32... Instep/operating lever, 34... Pin, 36... Communication hole, 37... Valve body, 38... Valve operating rod , 39... Valve operation cam.

Claims (3)

[Claims] (1) A mechanism that converts the membrane motion of the autopsy membrane that reciprocates due to a pressure difference into a rotational motion, a mechanism that transmits the rotational motion to a metering mechanism and a slide valve section that opens and closes the gas passage, and the reciprocation or rotation. A circuit breaker rental gas meter comprising: a locking mechanism for inhibiting movement; a return mechanism for releasing the locking mechanism; and means for eliminating the pressure difference between the counting membranes during the return operation of the return mechanism. (2) The gas meter with a shutoff mechanism according to claim 1, wherein the pressure difference eliminating means lifts the valve body of the slide valve portion during the return operation of the return mechanism. (3) The pressure difference eliminating means forms a binox passage in the slide valve portion during the return operation of the return mechanism.
A gas meter with a shutoff mechanism as described in .