JP4062813B2 - Gas shut-off device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas shut-off device for ensuring safety in use of gas when a gas is used after a gas meter.
[0002]
[Prior art]
Conventionally, as shown in FIG. 3, this type of gas shut-off device includes a shut-off magnetism detecting means 1 using a reed switch for inspecting a system abnormality or starting / stopping the system, and a shut-off magnetism detecting means 1. A shutoff magnet 2 for applying a magnetic field change, a control means 3 using a microcomputer for outputting a shutoff valve closing signal upon receiving a shutoff signal sent from the shutoff magnetism detecting means 1 due to a magnetic field change of the shutoff magnet 2, and a lead The return magnetism detecting means 5 using the switch, the return magnet 6 for changing the magnetic field to the return magnetism detecting means 5, and the return signal sent from the return magnetism detecting means 5 due to the magnetic field change of the return magnet 6 are received. And a control means 3 for outputting a shut-off valve opening signal, and a shut-off valve 4 for closing the gas passage when receiving the shut-off valve closing signal and opening the gas passage when receiving the shut-off valve opening signal.
[0003]
[Problems to be solved by the invention]
However, in such a gas shut-off device, both the shut-off magnetism detecting means and the return magnetism detecting means are operated by the magnetic change of the magnet, so that a return signal is sent from the return magnetism detecting means to the control means by the shut-off magnet. The control means sends a shut-off valve return signal to the bidirectional shut-off valve and opens the gas passage. Also, there is a risk of malfunction such as a shut-off signal is sent from the shut-off magnetism detection means to the control means by the return magnet, and the control means sends a shut-off valve return signal to the bidirectional shut-off valve to close the gas passage. was there.
[0004]
In addition, if the shut-off magnetic detection means and return magnetism detection means can be installed at positions that are not affected by the magnetic field change of the shut-off magnet and the return magnet, malfunction will not occur, but the meter case of the existing gas shut-off device will be reused Therefore, it is necessary to install the magnetic detecting means for blocking and the magnetic detecting means for return close to each other.
[0005]
The present invention solves the above-described conventional problems, and an object of the present invention is to provide a gas cutoff device having a function of preventing malfunction of the magnetic detection means for cutoff and the magnetic detection means for return.
[0006]
[Means for Solving the Problems]
To achieve the above object, a shutoff valve provided in the gas flow path, a control means for driving the shutoff valve, a shutoff magnetic detection means for outputting a shutoff signal to the control means by a magnetic field change, A return magnetic detection means for outputting a return signal to the control means due to a magnetic field change, and an output from the return detection means to the control means when the cutoff detection means outputs a cutoff signal to the control means. And a return determination unit that ignores the return signal.
[0007]
According to the above invention, since both the magnetic detecting means for breaking and the magnetic detecting means for returning operate by the magnetic change of the magnet, the return signal is sent from the returning magnetic detecting means to the control means by the breaking magnet, and both control means A shutoff valve return signal is sent to the direction shutoff valve, and the gas passage is opened. Also, the function of preventing malfunction such as a shutoff signal is sent from the shutoff magnetism detection means to the control means by the return magnet, and the control means sends a shutoff valve return signal to the bidirectional shutoff valve to close the gas passage. A gas shut-off device provided can be provided.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
A shut-off valve provided in the gas flow path; a control means for driving the shut-off valve; a shut-off magnetic detection means for outputting a shut-off signal to the control means by a magnetic field change; A return magnetic detection means for outputting a return signal, and a return signal output from the return detection means to the control means is ignored when the cutoff detection means outputs a cutoff signal to the control means. It has a return determination part.
[0009]
【Example】
Example 1
FIG. 1 is a configuration diagram of a gas cutoff device according to Embodiment 1 of the present invention.
[0010]
In FIG. 1, a test switch 7 using a reed switch as a magnetic detection means for interruption, a return switch 8 using a reed switch as a magnetic detection means for return, a cutoff magnet 2 that applies a magnetic field change to the test switch 7, A control circuit 9 using a microcomputer as a control means for outputting a shut-off valve closing signal upon receiving a shut-off signal sent from the test switch 7 due to a change in the magnetic field of the shut-off magnet 2, and a return magnet for changing the magnetic field to the return switch 8 6 are provided. When the control circuit 9 receives a return signal sent from the return switch 8 due to a change in the magnetic field of the return magnet 6, it outputs a shut-off valve open signal. When the shutoff valve closing signal is received, the gas passage is closed, and when the shutoff valve opening signal is received, the shutoff valve 4 that opens the gas passage and when the shutoff signal is output from the test switch 7 to the control circuit 9, The return determination unit 10 ignores a return signal output from the return switch 8 to the control circuit 9.
[0011]
In this embodiment, the return determination unit 10 is provided in the control circuit 9.
[0012]
Next, the operation will be described. When shutting off, the shutoff valve 4 is shut off by outputting a shutoff signal from the test switch 7 to the control circuit 9 due to the magnetic field change of the shutoff magnet 2. When the return is performed, when the return signal is output from the return switch 8 to the control circuit 9 due to the magnetic field change of the return magnet 6, the return determination unit 10 determines whether the cutoff signal is output to the control circuit 9, and the cutoff is performed. When there is a signal, the shut-off valve 4 is not returned, and when there is no shut-off signal, the shut-off valve 4 is returned.
[0013]
【The invention's effect】
As is apparent from the above description, the gas barrier device of the present invention provides the following effects.
[0014]
When it is necessary to close the gas passage, the return signal is sent to the shut-off valve by the shut-off magnet via the return magnetism detecting means, and the malfunction of opening the gas passage can be prevented. At the same time, when it is necessary to open the gas passage, a shut-off signal is sent to the shut-off valve by the return magnet via the shut-off magnetic detection means to prevent the malfunction of closing the gas passage. Can do.
[Brief description of the drawings]
FIG. 1 is a block diagram of a gas shut-off device according to a first embodiment of the present invention. FIG. 2 is a block diagram of a gas shut-off device according to another embodiment of the present invention. Explanation】
2 shut-off magnet 4 shut-off valve 6 return magnet 7 test switch (shut-off magnetic detection means)
8 Return switch (returning magnetic detection means)
9 Control circuit (control means)
10 Return determination unit 11 Function determination unit

Claims (1)

  A shut-off valve provided in the gas flow path; a control means for driving the shut-off valve; a shut-off magnetic detection means for outputting a shut-off signal to the control means by a magnetic field change; A return magnetic detection means for outputting a return signal, and a return signal output from the return detection means to the control means is ignored when the cutoff detection means outputs a cutoff signal to the control means. A gas shut-off device comprising a return determination unit.

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