JP4029506B2 - 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. 6, 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, since such a gas shut-off device is operated by the magnetic change of the magnet for both the shut-off magnetic detection means and the return magnetism detection means, a return signal is sent from the return magnetism detection 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. In addition, a malfunction may occur in which a shut-off signal is sent from the shut-off magnetism detecting 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. there were.
[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 has been developed to solve the above-described conventional problems, and an object thereof is to provide a gas cutoff device having a function of preventing malfunction of the cutoff magnetic detection means and the return magnetic detection means.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, a shutoff valve arranged in a 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, and others A return magnetic detection means for outputting a return signal to the control means in response to a change in magnetic field, and a magnetic shield means made of a soft magnetic material disposed between the blocking magnetic detection means and the return magnetic detection means. It has been done.
[0007]
According to the above-described invention, the magnetic detecting means for breaking and the magnetic detecting means for returning operate by the magnetic field change from each predetermined direction, and the magnetic shielding means shields the magnetism by the magnetic shielding means when the magnetic field changes from other directions. Gas shut-off device capable of preventing detection means and return magnetism detection means from operating, and preventing malfunction of shutoff magnetism detection means by return magnet and malfunction of return magnetism detection means by shutoff magnet Can be provided.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention includes a shutoff valve provided in a 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, and another magnetic field change. It comprises a return magnetic detection means for outputting a return signal to the control means, and a magnetic shielding means provided between the blocking magnetic detection means and the return magnetic detection means.
[0009]
The magnetic shielding means is constructed in a cubic shape with one magnetic field change direction left open.
[0010]
The magnetic shielding means is constructed integrally with the exterior housing of the return magnetic detection means.
[0011]
Further, the shielding magnetic detection means and the return magnetic detection means are provided on the printed wiring board, and a non-magnetic exterior case capable of storing the printed wiring board, and a magnetic shield integrally provided on the exterior case. Means are provided.
[0012]
The printed wiring board is provided with a groove, and the magnetic shielding means is provided on the front and back surfaces of the printed wiring board through the groove.
[0013]
The magnetic shielding means is provided on the front and back surfaces of the printed wiring board through a groove provided in the printed wiring board.
[0014]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0015]
Example 1
Fig.1 (a) is a block diagram of the gas interruption | blocking apparatus of Example 1 of this invention, FIG.1 (b) is a perspective view of a shield board.
[0016]
In FIG. 1, a test switch 7 using a reed switch as a magnetic detection means for interruption, a return switch 9 using a reed switch as a magnetic detection means for return, and a cutoff magnet 2 for applying a magnetic field change to the test switch 7 When a cut-off signal sent from the test switch 7 is received due to a change in the magnetic field of the test cut-off magnet 2, a control circuit 9 using a microcomputer as a control means for outputting a cut-off valve closing signal, and a return for changing the magnetic field to the return switch 9 When receiving the return signal sent from the return switch 9 due to the change in the magnetic field of the return magnet 6 and the return magnet 9, the control circuit 8 outputs the cutoff valve opening signal. When the cutoff valve closing signal is received, the gas passage is closed and the cutoff valve is closed. When the open signal is received, the shutoff valve 4 for opening the gas passage, between the test switch 7 and the return magnet 6 and for the return switch 9 and the shutoff are provided. In magnetic metal in the order of 1mm thick, such as steel plate at a position between the stones 2, in which to install the shield plate 10 as a magnetic shielding means it has a shape to cover the return switch 9 on the printed circuit board 11.
[0017]
Next, the operation will be described. When the interruption is performed, an interruption signal is output from the test switch 7 to the control circuit 8 due to a change in the magnetic field of the interruption magnet 2, and the return switch 9 is magnetized by the shield plate 10 between the interruption magnet 2 and the return switch 9. Since it is shielded, no return signal is output to the control circuit 8. When the return is performed, a return signal is output from the return switch 9 to the control circuit 8 due to a change in the magnetic field of the return magnet 6, and the test switch 7 is magnetized by the shield plate 10 between the return magnet 6 and the test switch 7. Is not output to the control circuit 8. Therefore, the malfunction of the test switch 7 due to the return magnet 6 and the malfunction of the return switch 9 due to the cutoff magnet 2 can be prevented.
[0018]
In the embodiment, the blocking magnetic detection means and the return magnetic detection means both use reed switches, but other magnetic detection means such as a magnetoresistive element, a Hall element, a magnetic sensor using the Barkhausen effect, etc. Even if is used, the same effect is obtained.
[0019]
Moreover, although the magnet was used for the external magnetic field, an electromagnet may be used.
[0020]
The magnetic shielding means uses a magnetic metal such as a steel plate. However, a magnetic material may be deposited on a non-magnetic skeleton, or a magnetic material dispersed in a resin binder may be formed.
[0021]
The control means receives the shut-off signal and the return signal, and shuts off and returns the shut-off valve. However, even if the memory means in the microcomputer is switched without driving the shut-off valve, the signal is sent to the external control means (not shown). May be issued.
[0022]
(Example 2)
Fig.2 (a) is a block diagram of the gas cutoff device of Example 2 of this invention. FIG. 2B is a perspective view of the magnetic shielding means according to the second embodiment of the present invention.
[0023]
In FIG. 2, the shield plate 10 having the soldering terminals 13 that can be inserted into the soldering holes 12 provided in the printed wiring board 11 is provided. A reliable fixing method can be realized by soldering the shield plate 10 to the printed wiring board 11, and at the same time, by connecting the soldering terminal 13 in the same pattern as the circuit ground or the like, electrical noise entering from the outside is attenuated. It is possible. Moreover, by solder plating the shield plate 10, the solderability of the shield plate 10 and the printed wiring board 11 is improved, and the rust resistance of the shield plate 10 is improved. The solder plating may be tin plating or zinc plating.
[0024]
(Example 3)
FIG. 3 is a structural diagram of the return switch 9 according to the third embodiment of the present invention.
[0025]
In FIG. 3, the shield plate 10 is used as a casting container, and the return switch 9 is filled with the resin material 14 and the reed switch 15 is fixed.
By using the shield plate 10 as a casting container and fixing the reed switch 15, it is not necessary to mold the return switch 9 in a resin case. Further, the mounting space on the printed wiring board 11 and the mounting man-hours can be reduced.
[0026]
Example 4
FIG. 4 is a schematic diagram showing an outer case 16 and magnetic shielding means according to a fourth embodiment of the present invention.
[0027]
In FIG. 4, a shield part 17 plated with a magnetic material between the test switch 7 and the return switch 9 is attached to the printed wiring board 11 as a magnetic shielding means.
[0028]
By integrating the outer case and the magnetic shielding means, there is no need to provide a shield plate on the printed wiring board 11.
[0029]
(Example 5)
FIG. 5 is a schematic view showing a method for assembling the outer case 16 and the printed wiring board 11 according to the fifth embodiment of the present invention.
[0030]
In FIG. 5, by providing a groove 18 in the printed wiring board 11, the shield portion 10 is provided so as to extend across the front and back surfaces of the printed wiring board 11 through the groove 18.
[0031]
Since it covers the front and back surfaces of the printed wiring board 11, the shield part 10 can be enlarged, and a more reliable magnetic shielding effect can be obtained.
[0032]
【The invention's effect】
As is apparent from the above description, the gas barrier device of the present invention provides the following effects.
[0033]
By providing magnetic shielding means, when a plurality of magnetic detection means to detect by magnetic field change are installed close to each other, the magnetic detection means operates by magnetic change from each predetermined direction, and magnetic change from other directions Then, since the magnetism is shielded and the magnetic detection means does not operate, it is possible to prevent the malfunction of the interruption magnetic detection means by the return magnet and the malfunction of the return magnetic detection means by the interruption magnet.
[0034]
In addition, a secure fixing method can be realized by soldering the shield plate to the printed wiring board, and at the same time, the electrical noise entering from the outside is attenuated by connecting the soldering terminal to the same pattern as the exterior case or circuit ground. Is possible.
[0035]
Also, by using the shield plate as a casting container and fixing the reed switch, it is not necessary to mold the return switch with a resin case. Further, it is possible to reduce the mounting space on the printed wiring board and the mounting man-hours.
[0036]
Further, by integrating the outer case and the magnetic shielding means, there is no need to provide a shield plate on the printed wiring board.
[0037]
Moreover, since it covers the front and back surfaces of the printed wiring board, the shield plate can be enlarged, and a more reliable magnetic shielding effect can be obtained.
[Brief description of the drawings]
FIG. 1A is a configuration diagram of a gas shut-off device according to a first embodiment of the present invention. FIG. 2B is a perspective view of magnetic shielding means of the device. FIG. 2A is a diagram of a gas shut-off device according to a second embodiment of the present invention. Configuration diagram (b) Perspective view of magnetic shielding means of the apparatus. FIG. 3 is a configuration diagram of a return switch in the gas cutoff device of Embodiment 3 of the invention. FIG. 4 is an exterior of the gas cutoff device of Embodiment 4 of the invention. Fig. 5 is a schematic perspective view showing a case and magnetic shielding means. Fig. 5 is a schematic perspective view showing a method for assembling an exterior case, a pudding, and a wiring board in a gas shutoff device according to Embodiment 5 of the present invention. Block diagram of the shut-off device 【Explanation of symbols】
4 Shut-off valve 7 Test switch 8 Control circuit 9 Return switch 10 Shield plate 11 Printed wiring board 15 Reed switch 16 Exterior case 17 Shield part 18 Groove

Claims (5)

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 gas cutoff device comprising a return magnetic detection means for outputting a return signal, and a magnetic shielding means provided between the cutoff magnetic detection means and the return magnetic detection means. 2. The gas cutoff device according to claim 1, wherein the magnetic shielding means is formed in a cubic shape with one magnetic field change direction being vacant. The shielding magnetic detection means and the return magnetic detection means are provided on a printed wiring board, and include a non-magnetic exterior case capable of storing the printed wiring board, and a magnetic shielding means integrally provided on the exterior case. The gas shut-off device according to claim 1 provided. 3. The gas shut-off device according to claim 2, wherein the magnetic shielding means is formed integrally with the exterior casing of the return magnetic detection means. The gas cutoff device according to claim 1 or 3, wherein a groove is provided in the printed wiring board, and the magnetic shielding means is provided on the front and back surfaces of the printed wiring board through the groove.

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