JPH07233942A - Gas interruption equipment - Google Patents

Abstract

PURPOSE:To detect the states of opening and closing of a gas emergency trip valve being different in a characteristic impedance and thereby to improve convenience. CONSTITUTION:In the case when a storage instruction signal from a storage instruction means 6 (a switch input from outside or the like) is present, a difference in a characteristic impedance between opening and closing of a gas emergency trip valve 1 is detected by a valve opening-closing state detecting means 5. An opening-closing determination value storage means 7 stores determination values of opening and closing of the valve on the basis of opening-closing signals of the detected opening and closing. The difference in the characteristic impedance of the valve 1 is detected by the valve opening-closing state detecting means 5 immediately after the opening and closing of the valve 1 are executed by a valve driving means 4 or on other occasions. A control part 3 compares the detected opening-closing signals with opening-closing determination signals stored in the opening-closing determination value storage means 7, conducts judgement on the opening and closing of the valve 1 and makes an alarm information means 8 execute information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas shutoff device for preventing gas accidents.

[0002]

2. Description of the Related Art A conventional gas shutoff device of this type will be described with reference to FIG. In the figure, 1 is a shutoff valve for shutting off the gas passage, 2 is flow rate measuring means for measuring the flow rate corresponding to the flow rate of the passing gas, 4 is valve driving means for opening / closing the shutoff valve 1, and 5 is for opening / closing the shutoff valve 1. A valve open / closed state detecting means for detecting a difference in characteristic impedance and outputting an open / close signal, 12 outputs a drive signal to the valve drive means 4 to turn off the shutoff valve 1 when the gas flow rate measured by the flow rate measuring means is abnormal. A control unit that detects the opening / closing of the shutoff valve 1 by driving and determining the opening / closing signal from the valve opening / closing state detection unit 5 by a fixed determination value;
Reference numeral 8 denotes a warning notifying unit that gives a warning about the open / closed state of the shutoff valve 1.

Further, as shown in FIG. 4, the shut-off valve 1 has a different characteristic impedance (equivalent inductance) because the position of the plunger (iron core) is different in the open / closed state. The valve open / closed state detecting means 5 detects the difference in the equivalent inductance as a transient response characteristic with respect to the limiting resistance (by switching by the transistor in FIG. 5) by a circuit as shown in FIG. 5, and as shown in FIG. An open / close signal is output as times T1 and T2 at which a certain level is exceeded. Control unit 12
Compares the open / close signals T1 and T2 with a fixed determination value Ts to determine open and close.

[0004]

However, in such a gas shutoff device, when the shutoff valve 1 is changed in design, or when shutoff valves 1 having different configurations (having the same performance) are connected, the control unit is controlled. It was necessary to change the judgment value Ts of 12 frequently. If this judgment value is stored in a microcomputer or the like, it is necessary to change the microcomputer. Alternatively, it may not be possible to make a determination based on the determination value Ts of the control unit 12. The equivalent inductance when the shutoff valve 1 is opened and closed is determined by the magnetic circuit of the shutoff valve 1 as shown in FIG. Even if the performance is the same, the equivalent inductance easily changes depending on how the magnetic circuit is assembled,
In the extreme case, the equivalent inductance at opening and closing may even be reversed. In such a case, it is necessary to change the determination value Ts when the control unit 12 is open and closed according to the magnetic circuit of the shutoff valve 1.

Therefore, in the gas shutoff device of the present invention, the open / close determination can be easily performed even when the magnetic circuit of the shutoff valve is changed by design change, or when shutoff valves having the same performance but different magnetic circuit configurations are connected. Therefore, the object is to improve the usability of the gas shutoff device by detecting the open / closed state of the shutoff valve of the gas shutoff device.

[0006]

In order to achieve the above object, a gas shutoff device of the present invention comprises a flow rate measuring means for measuring a flow rate corresponding to a passing gas flow rate, a shutoff valve for shutting off a gas passage, and the shutoff. From the valve driving means for opening and closing the valve, the valve opening / closing state detecting means for detecting the characteristic impedance of the shutoff valve and outputting the opening / closing signal at the time of opening / closing, and the opening / closing signal output from the valve opening / closing state detecting means. Open / close determination value storage means for storing the open / close determination value, storage instructing means for externally instructing the open / close determination value storage means to open / close, and if the gas flow rate is abnormal due to the flow rate measuring means, valve drive A drive signal for driving the means is output. On the other hand, a control means for comparing the opening / closing signal output from the valve opening / closing state detecting means with an opening / closing determination signal stored in the opening / closing determination value storage means to determine opening / closing, and a warning notification signal from the control section. And a warning notifying means for notifying a warning by.

[0007]

In the gas shutoff device of the present invention having the above-described configuration, when there is a storage instruction signal from the storage instruction means (external switch, etc.), the valve open / closed state detection unit detects the difference in the characteristic impedance when the shutoff valve is opened and closed. The open / close determination value storage means stores a valve open / close determination value based on the detected open / close opening / closing signals. Immediately after opening and closing the shutoff valve by the valve driving means, the difference in the characteristic impedance of the shutoff valve is detected by the valve open / closed state detecting section, and the control section stores the detected open / close signal and the open / close determination value storage means. The open / close judgment signal is compared to determine whether the shutoff valve is open / closed, and the notification means notifies the change of the magnetic circuit of the shutoff valve due to a design change, or a shutoff valve with the same performance but a different magnetic circuit configuration is connected. Even if
Opening / closing can be easily determined, and the usability of the gas shutoff device can be improved by detecting the open / closed state of the shutoff valve of the gas shutoff device.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gas shutoff device of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is a shutoff valve for shutting off the gas passage, 2 is flow rate measuring means for measuring the flow rate corresponding to the flow rate of passing gas, 4 is valve driving means for opening and closing the shutoff valve, and 5 is the same as the conventional one. The difference in equivalent inductance of the shutoff valve 1 is detected as a transient response characteristic with respect to the limiting resistance (by switching by the transistor in FIG. 5), and the opening / closing signal is set as the times T1 and T2 when a certain level is cut as shown in FIG. The valve open / closed state detecting means 7 for outputting calculates the open / close judgment value T's from the open / close signals T1, T2 output from the valve open / closed state detecting means 5 as T's = (T1 + T2) / 2, and calculates this value. An open / close determination value storage means for storing, a switch 6 as a storage instructing means for externally instructing the open / close determination value storage means 7 to open and close, and 3 for the gas flow rate abnormality by the flow rate measuring means 2. In this case, the drive signal for driving the valve drive means 4 is output, while the open / close determination signal Ti output from the valve open / close state detection means 5 is compared with the open / close determination signal Ts stored in the open / close determination value storage means 7. Is a control means for judging whether to open or close, and 8 is a warning notification means for issuing a warning by a warning notification signal from the control section 3.

When the equivalent inductance of the shutoff valve 1 changes (when the design of the shutoff valve 1 is changed or when the shutoff valve 1 having a different configuration is connected), it is stored by pressing the switch of the storage instruction means 6 from the outside. An instruction signal is output, and the open / close determination value storage means 7 determines the determination value T's from the closing time T1 and the opening time T2 detected from the valve open / closed state, and stores it.

When there is an abnormality in the gas flow rate from the flow rate measuring means 2, the control section 3 sends a drive signal to the valve driving means 4 to close the shutoff valve 1. At this time, whether the shutoff valve 1 has operated reliably is compared with an open / close determination signal T's stored in the open / close determination value storage means 7 by comparing the open / close signal Ti sent from the valve open / closed state detection means 5. If Ti <T's, it means that the shutoff valve 1 has certainly operated, and if reverse Ti>T's, it detects that it has not operated. Further, even when the shut-off valve 1 is driven to open, it is possible to detect whether or not the shut-off valve 1 is surely opened. The open / close determination value storage unit 7 and the control unit 3 described above are
It can be realized by using a calculation function and a judgment function by a program operation of a microcomputer or the like.

The above-mentioned opening / closing judgment value storage means 7 and control section 3
FIG. 2 shows a program flow chart up to the detection of the open / closed state of the shutoff valve 1. In the figure, in process 20, it is determined whether or not there is a storage instruction signal from the switch of the storage instruction means 6. If there is no storage instruction signal, T'in step 21.
Determine if s is stored. If T's is not stored, the process returns to step 20. On the other hand, when there is a storage instruction signal from the switch of the storage instruction means 6 in processing 20, T's = (T1 + T2) / 2 is calculated in processing 22 and processing 23
To memorize T's.

Next, the process returns to the process 20, and since Ts is stored in the process 21, the process proceeds to the process 24. In process 24, the open / close signal Ti from the valve open / closed state detecting means 5 is received, and in process 25 T
i is compared with Ts and the valve is opened or closed to proceed to step 26. In the process 26, display of the open / closed state of the shutoff valve 1,
Or, it will not close when it should be closed, or it will not open when it should be opened.

The timing of detecting the open / closed state may be other than immediately after the shutoff valve 1 is opened / closed, and shock detection means (for example, an electromotive force generated when the plunger of the shutoff valve 1 is moved by a shock is detected). For example, immediately after impact detection is possible. The current state of the shutoff valve 1 can be detected from the outside of the gas shutoff device by means of communication with the outside. As the valve open / closed state detecting means 7, there is a method using an equivalent inductance and a resonance frequency of a capacitor. In this case, the above configuration can be adopted by using the pulse number of a predetermined time as the open / close signal.

[0015]

As apparent from the above invention, in the gas shutoff device of the present invention, the magnetic circuit of the shutoff valve is changed by design change, or shutoff valves having the same performance but different magnetic circuit configurations are connected. In this case, the storage instructing means causes the detection signal of the valve open / closed state detecting means to be updated and stored in the open / close determination value storage means, and the open / close determination reference value of the changed shutoff valve can be changed so that the open / close determination can be easily performed. The usability of the breaker can be improved.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a gas shutoff device according to an embodiment of the present invention.

FIG. 2 is a flowchart of the device.

FIG. 3 is a conventional functional block diagram.

[Fig. 4] (a) Sectional view with the shutoff valve open (b) Sectional view with the shutoff valve closed

FIG. 5 is a general transient response detection circuit diagram.

FIG. 6 is a characteristic diagram showing a transient response waveform when the shutoff valve is closed. (B) A characteristic diagram showing a transient response waveform when the shutoff valve is open.

[Explanation of symbols]

 3 Control Means 4 Valve Driving Means 5 Valve Opening / Closing State Detecting Means 6 Memory Instructing Means 7 Opening / Closing Judgment Value Storage Means 8 Warning Informing Means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor ▲ Yoshi ▼ Miho Tada 1006, Kadoma, Kadoma-shi, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A flow rate measuring means for measuring a flow rate corresponding to a passing gas flow rate, a shutoff valve for shutting off a gas passage, a valve driving means for opening / closing the shutoff valve, and a characteristic impedance of the shutoff valve are detected. A valve open / closed state detection means for outputting an open / closed signal when opened / closed, an open / closed determination value storage means for storing an open / closed determination value from the open / closed signal output from the valve open / closed state detection means, and the open / closed determination value storage means. A storage instructing means for externally instructing opening and closing, and a drive signal for driving the valve driving means when the gas flow rate is abnormal by the flow rate measuring means, while the valve opening / closing state detecting means A control means for comparing the open / closed signal output from the open / closed determination value storage means with the open / closed determination signal to determine open / close, and a warning notification hand for issuing a warning by a warning notification signal from the control means. Gas shutoff device with steps.