JP2008234540A - Gas shut-off device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shut off gas, according to a plurality of gas detection statuses and flow rates, in stages up to an alarm. <P>SOLUTION: A gas shut-off device includes a plurality of alarm units 7 having a detection means 9 for detecting the gas, a plurality of detection thresholds, and a detection signal transmission means for outputting a signal according to a detection level, when the detection level exceeds or becomes less than each threshold; a shut-off means 3 for supplying and shutting off the gas; a detection signal receiving means 5 for inputting a signal from the alarm units 7; a control means 2 for processing an output signal from the detection signal receiving means 5; and a flow rate detection means 4 for detecting a flow rate. The control means 2 outputs a signal to the shut-off means 3 to shut off the gas, according to a combination of detection levels from the plurality of alarm units 7, even when each output signal from the plurality of alarm units 7 is not a shut-off signal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas cutoff device that performs gas cutoff according to a detection level of an alarm device.

  Conventionally, this type of gas shut-off device shuts off gas when there is an alarm output from an alarm device (see, for example, Patent Document 1).

As shown in FIG. 6, it is composed of an alarm device 7 that gives an alarm when gas is detected and a gas shut-off device 1. In the figure, 6 is an alarm control means, 8 is a detection signal transmission means for transmitting a signal to the gas shut-off device when the gas concentration reaches an alarm level, 9 is a detection means for detecting gas, and 10 is an alarm. This is an alarm output means.
Japanese Patent Laid-Open No. 6-139486

  However, in the configuration of the conventional example, even if a plurality of alarm devices are installed, gas is not shut off until an alarm signal is output from any one of the alarm devices. At the same time, there is a problem that when a serious problem occurs in which the gas concentration increases, a dangerous state may occur.

  The present invention solves the above-described conventional problems, and uses a plurality of alarm devices having a plurality of detection thresholds to send a signal to the shut-off means even at the stage of reaching an alarm according to each detection level. Provides a gas shut-off device configured to shut off the gas by outputting a signal to the shut-off means in the case of a large flow rate by an output signal from the flow-rate detecting means, even if the gas is shut off by the output. The purpose is to do.

  In order to solve the above-described conventional problems, the shut-off device of the present invention includes a detection means for detecting gas and a plurality of detection thresholds, and outputs a signal corresponding to the level when the detection level is equal to or higher than each threshold value. A plurality of alarm devices provided with detection signal transmitting means, a shut-off means for supplying and shutting off gas, a detection signal receiving means for inputting a signal from the alarm device, and an output signal from the detection signal receiving means In addition to the control means and the flow rate detection means for detecting the flow rate, the control means responds to combinations of detection levels from the plurality of alarm devices even when output signals from the plurality of alarm devices are not cut-off signals, respectively. Even if the gas is shut off by outputting a signal to the shut-off means, and the gas is not shut off according to the combination of detection levels from a plurality of alarm devices, the flow-rate detecting means When the flow rate was more detected is above a predetermined value, outputs a signal to the blocking means is obtained by a structure for blocking gas.

  Thus, even before the alarm level is reached, the gas can be shut off, and the safety can be improved by shutting off at an earlier stage when the flow rate is detected and the flow rate is large.

The gas shut-off device of the present invention is configured to determine gas shut-off according to a combination of detection levels from a plurality of alarm devices. The gas concentration is simultaneously measured at a plurality of locations even in a low concentration state until reaching the alarm level. When a serious problem occurs, the gas can be shut off to increase safety.

  The first invention comprises a plurality of alarms comprising a detection means for detecting gas and a plurality of detection thresholds, and a detection signal transmitting means for outputting a signal corresponding to the level when the detection level is greater than or less than the respective threshold. A shutoff means for supplying and shutting off gas, a detection signal receiving means for inputting a signal from the alarm device, a control means for processing an output signal from the detection signal receiving means, and a flow rate for detecting a flow rate In addition to detecting means, the control means outputs a signal to the shut-off means in accordance with a combination of detection levels from the plurality of alarm devices, even when output signals from the plurality of alarm devices are not shut-off signals, respectively. However, the gas is shut off.

  As a result, when a serious problem occurs in which the concentration of gas increases simultaneously at a plurality of locations even in a low concentration state up to the alarm level, the gas can be shut off to increase safety.

  In the second invention, in particular, even when the control means of the first invention does not shut off the gas according to the combination of detection levels from the plurality of alarm devices, the flow rate detected by the flow rate detection means is not less than a predetermined value. In this case, the gas is shut off by outputting a signal to the shut-off means.

  Thereby, even in a low concentration state up to the alarm level, when the flow rate is detected and the flow rate is large, the gas can be shut off at an earlier stage to improve safety.

  A third invention is a program for causing a computer to function as all or part of the gas cutoff device according to any one of the first to first inventions.

  And since it is a program, at least one part of the program of this invention is easily realizable using a general purpose computer or a server. Also, program distribution and installation can be simplified by recording on a recording medium or distributing a program using a communication line.

  The present invention can achieve the object of the present invention by making the main part of the first invention from the first invention into the embodiment, so that the details of the embodiment corresponding to each claim will be described below with reference to the drawings. The description will be given with reference to the best mode for carrying out the present invention. Note that the present invention is not limited to the present embodiment. Further, in the description of each embodiment, the same configuration and the same function and effect are given the same reference numerals, and redundant description will not be given.

(Embodiment 1)
FIG. 1 is a block diagram of a gas cutoff device according to Embodiment 1 of the present invention, FIG. 2 is a detection level cutoff selection diagram of the gas cutoff device, and FIG. 3 is a flowchart showing the operation of the gas cutoff device.

In FIG. 1, the detection signal receiving means 5 of the gas cutoff device 1 receives the output from the alarm device 7 and outputs the contents to the control means 2. The flow rate detection means 4 detects the gas flow rate and outputs it to the control means 2. The control means 2 comprising a microcomputer and its peripheral circuit stores a program for executing the control flow of steps (hereinafter referred to as S) 1 to S9 shown in FIG. And the flow rate is calculated by the input from the flow rate detection means 4. Reference numeral 7 denotes an alarm, and the alarm controller 6 outputs a signal corresponding to the detected level to the detection signal transmitter 8 by the output from the detector 9 for detecting the gas.
When the level detected by the detection means 9 is equal to or higher than the alarm level, it is output to the alarm output means 10 for notification. FIG. 2 is for the control means 2 to output a cutoff signal to the cutoff means 3 in accordance with the level received by the detection signal receiving means 5 from the alarm device 7.

  In FIG. 3, the control means 2 determines whether or not there is reception from the alarm device I among a plurality of alarm devices (hereinafter referred to as alarm device I and alarm device II) (S1). The process proceeds to S6. If there is reception, it is determined whether the level received by the detection signal receiving means 5 is the cutoff level (S2). If the reception level is the cutoff level, the process proceeds to S5. In S3, it is determined whether the level received by the detection signal receiving means 5 is level B. If the received level is level B, it is determined whether level B has been received from the alarm device II (S4). In the case of, go to S5. In S5, a cutoff signal is output to the cutoff means 3 to shut off the gas. In S6, it is determined whether or not there is reception from the alarm device I. If there is reception, it is determined whether or not the level received by the detection signal receiving means 5 is a cutoff level (S7). If the reception level is the cutoff level, S5 is determined. Proceed to In S8, it is determined whether the level received by the detection signal receiving means 5 is level B. If the received level is level B, it is determined whether level B has been received from the alarm device I (S9). In this case, the process proceeds to S5, where a shutoff signal is output to the shutting means 3 to shut off the gas.

  As described above, in this embodiment, when a serious problem occurs in which the gas concentration is increased simultaneously at a plurality of locations even in a low concentration state up to the alarm level, the gas is shut off. Safety can be increased.

(Embodiment 2)
4 is a detection level cutoff selection diagram of the gas cutoff device according to Embodiment 2 of the present invention, and FIG. 5 is a flowchart showing the operation of the gas cutoff device. The present embodiment is different from the control unit 2 shown in FIG. 1 in the first embodiment only in the program, and the block diagram of the gas cutoff device is the same as FIG. That is, the control means 2 stores a program for executing the control flow from S10 to S24 shown in FIG.

  FIG. 4 is for the control means 2 to output a cutoff signal to the cutoff means 3 according to the level received by the detection signal reception means 5 from the alarm device 7 and the flow rate detected by the flow rate detection means 4.

In FIG. 5, the control means 2 determines whether or not there is a reception from the alarm device I (S10). If there is no reception, the process proceeds to S18, and if there is a reception, the detection signal receiving means 5 receives it. It is determined whether the level is a cutoff level (S11). If the reception level is a cutoff level, the process proceeds to S15. In S12, it is determined whether or not the flow rate detected by the flow rate detection means 4 is greater than or equal to a predetermined value. If it is greater than or equal to the predetermined value, the process proceeds to S16. If the flow rate is not equal to or greater than the predetermined value, it is determined whether the level received by the detection signal receiving means 5 is level B (S13). If the received level is level B, level B is output from the alarm device II. It is determined whether it has been received (S14), and if it has been received, the process proceeds to S15. In S15, a cutoff signal is output to the cutoff means 3 to shut off the gas. In S16, it is determined whether or not the level received by the detection signal receiving means 5 is level A. If the received level is level A, the process proceeds to S14, and if it is not level A, that is, if it is level B, the alarm device II. Whether or not level A has been received is determined (S17). If it has been received, the process proceeds to S15 to output a shut-off signal to the shut-off means 3 to shut off the gas. In S18, it is determined whether or not there is reception from the alarm device II. If there is reception, it is determined whether or not the level received by the detection signal receiving means 5 is a cutoff level (S19). Proceed to S15. In S20, it is determined whether or not the flow rate detected by the flow rate detection means 4 is equal to or greater than a predetermined value. If the flow rate is not equal to or greater than the predetermined value, it is determined whether or not the level received by the detection signal receiving means 5 is level B (S21). It is determined whether it has been received (S22). If it has been received, the process proceeds to S15. In S23, it is determined whether or not the level received by the detection signal receiving means 5 is level A. If the received level is level A, the process proceeds to S22. If the level is not level A, that is, level B, the alarm device I Whether or not level A has been received is determined (S24). If it has been received, the process proceeds to S15 to output a shut-off signal to the shut-off means 3 to shut off the gas.

  As described above, in the present embodiment, even in a low concentration state up to the alarm level, the flow rate is detected, and in the case of a large flow rate, the gas is shut off at an earlier stage to improve safety. it can.

  In each of the above embodiments, the control flow is executed by causing the microcomputer to function with the program stored in the control means, but it is also possible to execute it with hardware instead of the program. Further, the transmission method of each signal of the gas cutoff device and the alarm device can be applied to any of a wired method, a wireless method, and a combination of a wired method and a wireless method.

  As described above, the ventilating fan-linked gas shutoff device according to the present invention can be realized by transmitting each signal of the gas shutoff device and the alarm device, and therefore can be applied to a method of concentrating and controlling each signal at a relay point.

The block diagram of the gas interruption | blocking apparatus in Embodiment 1-2 of this invention Detection level cutoff selection diagram of gas cutoff device in Embodiment 1 of the present invention The flowchart which shows operation | movement of the gas cutoff device in Embodiment 1 of this invention. Detection level cutoff selection diagram of gas cutoff device in Embodiment 2 of the present invention The flowchart which shows operation | movement of the gas cutoff device in Embodiment 2 of this invention. Block diagram of a conventional ventilation fan interlocking gas shutoff device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas shut-off device 2 Control means 3 Shut-off means 4 Flow rate detection means 5 Detection signal receiving means 6 Alarm control means 7 Alarm device 8 Detection signal transmission means 9 Detection means 10 Alarm output means

Claims (3)

A plurality of alarm devices including a detection means for detecting gas and a plurality of detection thresholds, and a detection signal transmitting means for outputting a signal corresponding to the level when the detection level is equal to or higher than each threshold value or less than the threshold value, and gas supply And a shutoff means for shutting off, a detection signal receiving means for inputting a signal from the alarm device, a control means for processing an output signal from the detection signal receiving means, and a flow rate detecting means for detecting a flow rate, The control means outputs a signal to the shut-off means and shuts off the gas according to a combination of detection levels from the plurality of alarm devices, even when output signals from the plurality of alarm devices are not shut-off signals, respectively. A gas shut-off device. The control means outputs a signal to the shut-off means when the flow rate detected by the flow rate detecting means is not less than a predetermined value even when the gas is not shut off according to the combination of detection levels from the plurality of alarm devices. A gas shut-off device, wherein the gas is shut off. The program which makes a computer function as all or one part of the ventilation fan interlocking gas interruption | blocking apparatus of any one of Claims 1-2.

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