JPH0348460Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a gas cutoff valve control device that opens or closes a gas cutoff valve by operating a switch.

[Conventional technology]

Conventional gas cutoff valve control devices generally include one dedicated switch for opening and closing the valve. For example, in the conventional control panel shown in Fig. 5, there is a press-type open switch SW ₂ and a press-type close switch for opening and closing the gas cutoff valve.
SW ₃ is installed, and when one of the switches is operated, the gas cutoff valve is opened or closed, and the lamp is turned off.
L ₁ or L ₂ lights up to notify the outside of the status.
Each of the switches SW ₂ and SW ₃ is color-coded or has the words "open" and "closed" printed on it, so that it is possible to distinguish between the valve opening and the valve closing. In addition,
_L3 has an alarm lamp that lights up when an abnormal signal such as a gas leak is input, and _L4 is a power lamp.

[The problem that the idea aims to solve]

In the conventional control device described above, a plurality of switches SW ₂ and SW ₃ are provided to open and close the gas cutoff valve, respectively, so erroneous operation may occur, resulting in safety issues. There is a problem above.
Furthermore, since multiple switches are required, the cost is high.

Therefore, the present invention aims to provide a gas cutoff valve control device that prevents erroneous operations when opening or closing a valve and does not increase costs.

[Means to solve the problem]

In order to solve the above problems, the gas cutoff valve control device according to the present invention is, as shown in FIG. 1, in which the gas cutoff valve 1 is opened or closed by a switch operation. Momentary switch for opening and closing valves
SW ₁ , a valve state detection means 2 for detecting the open or closed state of the gas cutoff valve 1, and a detection output from the valve state detection means 2 before the operation according to the operation of the momentary switch SW ₁ . a control means 3 for outputting a control signal based on the control signal; and a drive means 4 for opening and closing the gas cutoff valve ₁ under the control of the control signal. This valve is configured to switch between a valve open state and a valve closed state.

Furthermore, the control means 3 is a momentary switch.
It includes means for determining whether the gas cutoff valve 1 operates normally or abnormally based on the detection output of the detection means 2 before and after the operation of SW ₁ , and when the gas cutoff valve 1 operates abnormally, the momentary switch is activated. Regardless of the operation of SW ₁ , a control signal for closing the gas cutoff valve 1 is output to the driving means 4.

[Effect]

In the above configuration, the control means 3 detects the detection means 2
A detection output indicating whether the gas cutoff valve 1 is open or closed is input. In this state, the operation of the momentary switch SW ₁ is identified, and a control signal is output to the drive means 4 to put the gas cutoff valve 1 in a state opposite to the state before the switch SW ₁ was operated.
The control signal causes the gas cutoff valve 1 to switch from the valve open (valve closed) state before the operation of the momentary switch SW ₁ to the valve closed (valve open) state, and the detection means 2 also performs detection corresponding to this switched state. This becomes the output. The momentary switch SW ₁ returns to its original state when an external operation is released. Therefore, each time the switch SW ₁ is operated, the gas cutoff valve 1 is switched between an open state and a closed state.

Note that when the detection output from the detection means 2 does not correspond to the normal state of the gas cutoff valve ₁ even if the momentary switch SW 1 is operated, the control means 3
is determined to be an abnormal state and outputs a control signal to the control means 4 to close the gas cutoff valve 1, regardless of the operation of the momentary switch _SW1 , and forcibly closes the gas cutoff valve 1. do.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In FIG. 2, the on/off operating state of the momentary switch SW ₁ is detected by a switch detection circuit 6, and the detection signal is input to a microcomputer (hereinafter referred to as CPU) 5. Further, the open or closed state of the gas cutoff valve 1 is detected by the cutoff valve state detection circuit 2, and the detection signal is inputted to the CPU 5. The CPU 5 outputs valve open and valve close pulse signals to the cutoff valve drive circuit 4, and the gas cutoff valve 1 is opened by the valve open pulse signal and closed by the valve close pulse signal. In addition, alarm lamps and power lamps L ₁ , L ₂ ,
A drive signal is output to L ₃ and L ₄ to control their lighting and extinguishing. Momentary switch SW ₁ turns on when pressed from the outside, and automatically returns and turns off when the operation is released. The switch detection circuit 6 outputs an "L" level signal when the switch _SW1 is on, and outputs an "H" level signal when the switch SW1 is off. Further, the cutoff valve detection circuit 2 generates a detection output of the "H" level when the gas cutoff valve 1 is open, and produces a detection output of the "L" level when the gas cutoff valve 1 is closed. The detection outputs of the switch detection circuit 6 and the shutoff valve state detection circuit 2 are input to the CPU 5, and predetermined processing is performed on the shutoff valve drive circuit 4 and each of the lamps _L1 to _L4.
control. FIG. 3 shows the configuration of the control panel in the control device of FIG. 2, including one momentary switch SW ₁ and a lamp L ₁ that indicates the open and closed states of the gas cutoff valve 1 operated by the switch SW ₁ . ，
L ₂ is provided, and furthermore, an alarm lamp L ₃ and a power lamp L ₄ for indicating an abnormal condition are provided.

In the above configuration, the operation of the CPU 5 will be explained with reference to the flowchart of FIG. The flowchart starts when the power is turned on, and in the first step _S1, the power lamp _L4 is turned on, then in step S2, the detection output of the shutoff valve state detection circuit ₂ is input, and in step _S3 , the output is Turn on the corresponding lamp. In steps S ₂ and S ₃ , the initial state when the power is turned on is set. Next, proceed to step _S4 and register the detection output of the shutoff valve status detection circuit 2.
Store in D ₁ . After inputting the switch detection output in step _S5 , the output of this switch detection circuit 6 is determined in step _S6 . In other words, if the level is "H", the momentary switch
Since SW ₁ is not operated and is in the OFF state, the process waits at step _S6 . If the level is "L", momentary switch SW ₁ has been operated and turned on, so proceed to step _S7 and register
Determine the contents of D ₁ . If the "L" level ("0") is stored in the register _D1 , the gas cutoff valve 1 is in the closed state before the switch _SW1 is operated, and a valve opening pulse signal is output in step _S9 . , "H"
If the level is "1", the valve is open before the switch SW ₁ is operated, so a valve closing pulse signal is output in step _S14 .

First, in step _S8 , a valve opening pulse signal is output, and then the process proceeds to step _S9 , where the detection output of the shutoff valve state detection circuit 2 is input, and this detection output is determined in step _S10 . At this time, if the detection output is at the "H" level, the gas cutoff valve 1 is changed from the valve closed state to the valve open state by the drive circuit 4, and is operating normally, so the valve closing lamp _L2 is turned on in step _S11 . After turning off the light and lighting the valve opening lamp _L1 , proceed to step _S4 .
Returning to step _S10 , the contents of register _D1 are updated with the detection output ("H" level) input in step S10.

Further, if the detection output remains at the "L" level in step _S10 , the gas cutoff valve 1 is determined to be in an abnormal state because it is malfunctioning due to failure to open the valve.
In step _S12 , a valve closing pulse signal is output.
The valve closing pulse signal in step _S12 is generated regardless of the operation of the momentary switch _SW1 , and drives the cutoff valve drive circuit 4 to forcibly close the gas cutoff valve 1. Next, in step _S13 , the valve closing lamp _L1 is blinked.

On the other hand, in the register determination process of step _S7 , if "H" level is stored, the switch is
Since the gas cutoff valve 1 is in the open state before SW ₁ is operated, a valve closing pulse signal is output in step _S14 . Next, in step _S15 , the detection output of the shutoff valve state detection circuit 2 is input, and in step _S16 , this detection output is determined.

At this time, if the detection output is at "L" level,
Since the gas cutoff valve 1 is changed from the open state to the closed state by the drive circuit 4 and is operating normally, the valve opening lamp _L1 is turned off and the valve closing lamp _L2 is turned on in step _S17 . After that, the process returns to step _S4 , and the contents of register _D1 are updated with the detection output ("L" level) input in step _S15 . Another step
If the detection output remains at the "H" level in _S16 , it is determined that the gas cutoff valve 1 is in an abnormal state because it has failed to close, and the valve is closed in step _S18 regardless of the operation of the momentary switch _SW1 . A closing pulse signal is repeatedly output at a predetermined period to intermittently drive the cutoff valve drive circuit 4 to bring the gas cutoff valve 1 into a closed state. Next, in step _S19 , the valve closing lamp _L2 is blinked.

As can be understood from the above operation, each time the momentary switch SW ₁ is operated (turned on), the state of the gas cutoff valve 1 before the switch is operated is reversed to switch between the valve open and valve closed states. Further, when the gas cutoff valve 1 malfunctions, the valve is forcibly closed to ensure safety.

〔effect〕

As described above, according to the present invention, since the open and closed states of the gas cutoff valve are switched each time the momentary switch is operated, erroneous operation can be prevented and safety can be improved. Furthermore, since the number of operation switches can be reduced, costs can be reduced and reliability can be improved.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of the present invention;
FIG. 3 is a block diagram showing an embodiment of the control device according to the present invention, FIG. 3 is a diagram showing an example of the configuration of the control panel in the device shown in FIG. 2, and FIG. 4 is a flowchart showing the processing of the CPU in FIG. 2. FIG. 5 is a diagram showing a control panel in a conventional control device. DESCRIPTION OF SYMBOLS 1... Gas cutoff valve, 2... Valve state detection means (shutoff valve state detection circuit), 3... Control means, 4... Drive means (shutoff valve drive circuit), 5... CPU, 6...
Switch detection circuit, SW ₁ ... Momentary switch, L ₁ ... Valve opening lamp, L ₂ ... Valve closing lamp,
L ₃ ...Alarm lamp.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A gas cutoff valve control device that opens or closes a gas cutoff valve by operating a switch, comprising: a momentary switch for opening and closing the valve; and the gas cutoff. a valve state detection means for detecting the open or closed state of the valve; a control means for outputting a control signal based on a detection output from the valve state detection means before the operation in response to the operation of the momentary switch; It is characterized by comprising a driving means for opening and closing the gas cutoff valve under control of a control signal, and configured to switch the open or closed state of the gas cutoff valve by operating the momentary switch. Gas shutoff valve control device. (2) The control means has means for determining whether the gas cutoff valve operates normally or abnormally based on the detection output of the detection means before and after the momentary switch is operated, and the gas cutoff valve operates abnormally. The gas cutoff valve according to claim 1, wherein a control signal for closing the gas cutoff valve is output to the driving means regardless of the operation of the momentary switch. Control device.