JPS6190015A - Dry gas meter - Google Patents

Abstract

PURPOSE:To simplify assembly of the titled meter by providing a detaining device which contacts with a diaphragm of a gas meter and narrows a dia phragm operating area as a cutoff part to stop gas supply and providing a safety function part centralizingly. CONSTITUTION:The 1st diaphragm 16 and the 2nd diaphragm 17 are provided and chambers 19, 20, 21, 23 are formed to pass the gas. Further, the diaphragms 16, 17 are reciprocated by arms 24, 25 and the flow rate is detected by a position detector 12. Further, the detaining device 36 is composed of a solenoid 33, a spring 34 and a detaining piece 35. Then, in case of deviating from the normal operation, the detaining piece 35 of the detaining device 36 moves to the left and abuts on the 1st diaphragm 16 to detain its reciprocating movement and to cutoff the gas. Accordingly, since the cutoff pat is composed of the detaining device contacting with the diagramph, the components to perform the safety function can be provided centralizingly to the front face of the lower case and the assembly can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is capable of supplying gas by determining that it is an unsafe condition when the gas is being used in an abnormally large amount or for an abnormally long time compared to normal gas usage conditions. This relates to a dry gas meter that automatically stops.

Figures 5 and 6 show a conventional example with a safety function that detects the flow rate with a dry gas meter and stops the gas supply when it is determined that the flow rate has exceeded a predetermined normal usage range. Indicated. Fifth
The figure shows the appearance in the installed state, and FIG. 6 is a partial sectional view. The gas meter has a groove structure in which the upper part of a lower case 1 with a built-in measuring function is covered by an upper case 2 to which an inflow/output part is connected, and a counter case 3 is provided on the front of the upper case to indicate the integrated value of the gas flow rate. ing. A control box 6 containing a control section 4 and a display 5 is provided on the front surface of the lower case 1. The upper case 2 is provided with a shutoff valve 9 corresponding to a valve seat 8 formed at the lower end of the inlet cap 7. Further, a permanent magnet 11 is fixed to a part of a link mechanism 10 that operates in conjunction with the measuring section of the lower case 1, and operates a position detector 12. These cutoff valve 9 and position detector 12 are provided in an atmosphere through which gas flows, but must be electrically connected to the control unit 4 in the controller box 6 on the front surface of the lower case 1. Therefore, a signal line was drawn out to the outside of the gas atmosphere using an airtight terminal (not shown) and connected by a cable 13. Note that 14 is a return shaft for opening the valve for reuse after the shutoff operation, and 15 is an outlet cap that has passed through the gas meter.

Since the shutoff valve 9 and the position detector 12 are in a gas atmosphere as described above, soldering work to the airtight terminals as described above and wiring to prevent the busbar from touching the link mechanism 10 inside the upper case 2 are required. Processing work was required, and assembly work was troublesome. Furthermore, since the cable 13 is exposed, there is a risk that the device will not operate if it is cut for some reason.

Purpose of invention The present invention aims to solve the above-mentioned problems.

The purpose is to centrally install the safety function section, which consists of a position detector, a cutoff section, and a control section, to simplify assembly work and eliminate exposed signal wires.

Structure of the Invention In order to achieve the above-mentioned object, the present invention comprises a locking device that makes contact with the diaphragm of the gas meter to narrow the operating area of the diaphragm. When the operation of the diaphragm is forcibly stopped, the gas stops flowing, which is used to perform the cutoff operation, and by making it possible to provide the cutoff part on the front side of the diaphragm where the control part is located, electrical connection work is simplified. has been achieved.

DESCRIPTION OF THE EMBODIMENTS An embodiment according to the present invention is shown in FIGS. 1 to 4. Figure 3 is a front view, and Figure 1 is a cross-sectional view taken along line A-A.
FIG. 2 is a front view of the lower case from which the front control box cover and the printed circuit board constituting the control section are removed. FIG. 4 is a top view of FIG. 3 with the upper case removed.

Note that the same numbers are given to parts that are completely similar to those in FIGS. 5 and 6 showing the conventional example. In FIG. 1, the lower case 1 is provided with a first diaphragm 16 and a second diaphragm 17 in parallel. A chamber 2o is formed between the diaphragms 16. Similarly, a chamber 2) is formed between the lower case and the second diaphragm 17, and a chamber 23 is formed between the lower case 1, the abdominal plate 22, and the second diaphragm 17. The reciprocating motion of each diaphragm is transmitted by arms 24 and 25 to the rotational reciprocating motion of shafts 26 and 27. This operation, as shown in FIG. 4, drives the link mechanism 10 to rotate the connecting pin 28 for displaying the integration value, and also the first slide valve 29 and the chamber 2) that sequentially send gas to the chambers 18 and 20. The second slide valve 30, which sequentially sends gas to and 23, is reciprocated. The link mechanism 10 and the slide valves 29 and 30 allow gas to sequentially enter each chamber with a phase difference with respect to the two diaphragms.
Continuous metering operation is also performed by controlling the gas to exit sequentially to the outlet 31 connected to the outlet 15.

In this embodiment, a non-magnetic housing 32 is fixed at the center of the belly plate 19, and the position detector 12 detects the back and forth movement of the permanent magnet 11 provided on the arm 24. The central part of the housing 32 has a convex space, and is normally in a position where the reciprocating movement of the first diaphragm 16 is not restricted by the self-holding solenoid 33, but when the self-holding state is released by energization, the spring 34 A locking piece 35 is provided which moves to the left under the force of 1, enters into the operating area of the first diaphragm 16, and comes into contact with the first diaphragm 16. When the locking piece moves to the left as shown in FIG. 1, the first diaphragm 16 cannot move forward from that position and therefore stops there. As a result, the slide valves 29, 30 and the second diaphragm 17 are also forced to stop, so that the gas flow is substantially stopped with only a small amount of leakage occurring from the slide valve sliding surface. in this way,
The present invention focuses on the point that gas supply can be stopped by stopping the operation of the diaphragm for metering without providing a valve in the gas passage. Now, these self-holding solenoid 33, spring 34, and locking piece 35 constitute a locking device 36 for shutting off, but when reusing the locked state, turn the return 11tll137 clockwise. When the first diaphragm 16 is rotated and the locking piece 35 is pushed to the right by the cam 38 to cause the self-holding solenoid 33 to self-hold, the first diaphragm 16 is no longer restricted in its operation and can return to its normal operating state. If the self-holding solenoid 33 is configured to attract and hold using the force of a magnet, reduce the attracting and holding force by energizing the coil, and move the locking piece 35 using the force of the spring 34, it will become a movable part as shown in FIG. It is easy to install the coil facing the chamber 20 which is in a gas atmosphere, and to install the coil outside the gas atmosphere.

As a result, the position detector 12 and the coil of the self-holding solenoid 33 serving as a cutoff part are placed outside the gas path and in the lower case 1.
It can be installed in the front center of the

Therefore, by housing the control unit 4 in the control box case 39 fixed to the belly plate 19 and covering it with the control box cover 40, it is possible to centrally install all the safety functional components in one place.

In the locked state, the first diaphragm 16 is restrained while trying to move further forward in FIG. The locking piece 35 receives this through the shaft or link gutter groove, which may cause distortion of the shaft, arm, or link mechanism. Therefore, in the position 1 of slide valve 30 in Fig. 4,
If the first diaphragm 16 is locked at a position where the second diaphragm 17 is at the dead center of reciprocating motion and is not generating force, as in the position of the second diaphragm 17 in FIG. It will be resolved.

In addition, self-holding solenoids do not require electricity to be applied to the coil under normal operating conditions, so they are suitable when using a battery with a limited electrical capacity as a power source. A solenoid may be used, and the specific mechanism for locking and the configuration of the return operation are not limited to those in the embodiment.

Effects of the Invention As explained in detail with reference to the embodiments, in the present invention, the blocking portion is configured with a locking device that comes into contact with the diaphragm and narrows the diaphragm operating area, so the parts that perform the safety function are concentrated on the front surface of the lower case. Since it became possible to install it, the work of connecting electrical signal lines became significantly easier, and the fear of malfunction due to cable cuts was also eliminated.

Furthermore, since it is not placed in a gas atmosphere, there is no need for coil molding, and the structure is also effective in simplifying parts, as it does not require airtight screws or valves.

Furthermore, there is no need to add a valve to cut off the gas supply, and the purpose is simply to stop the operation, so there is no risk of increasing the gas pressure drop during normal use, especially when reducing the gas pressure drop. This configuration is suitable for large-capacity gas meters where

[Brief explanation of drawings]

FIG. 1 shows a third example of a dry gas meter according to an embodiment of the present invention.
Figure 2 is a front view of the lower case with the control box cover and control unit removed; Figure 3 is a front view of the lower case; Figure 4 is a top view of the lower case with the control unit removed; FIG. 5 is a perspective view of the conventional example, and FIG. 6 is a top view of the installed portion. 4...Control unit, 12...Position detector, 16.17.
...Diaphragm, 19... Belly plate, 33... Self-holding solenoid, 34... Spring, 35... Locking piece, 36... Locking device. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 3 Figure 4 Figure 5 Figure 6

Claims (3)

[Claims] (1) A position detector that detects mechanical operation, and a control unit that receives the signal from the position detector, calculates the gas flow rate, and issues a shut-off signal if an unsafe condition deviates from predetermined criteria. , a dry gas meter with a safety function having a cutoff part that stops gas supply upon receiving the cutoff signal, wherein the cutoff part is provided with a locking device that comes into contact with a diaphragm of the gas meter to narrow the diaphragm operating area. (2) The locking device is provided with respect to one diaphragm, and the positional relationship is such that the state in which the diaphragm abuts and locks is the dead center of the reciprocating motion of the other diaphragm. Dry gas meter. (3) The dry gas meter according to claim 1, wherein the locking device, the control unit, and the position detector for detecting the reciprocating motion of the diaphragm are housed in a control box provided on the belly plate in front of the diaphragm. .