JP2932656B2 - Opening device for gas shut-off valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a safety device for a piping system for supplying gaseous fuel.

In recent years, city gas supply companies and the LP gas supply industry have been using gas meters to measure gas consumption as a means of ensuring the safety and security of gas use under administrative guidance. In the meantime, the use of a gas safety device equipped with a gas shut-off valve for shutting off a gas passage in the event of an abnormality is spreading.

Conventionally, gas shut-off valves in this type of gas safety device are:
When the gas is in normal use, the valve is opened by self-holding to keep the gas open and the gas flows.When the gas becomes abnormal, the monitoring unit operates and automatically closes the valve by electromagnetic action to shut off the gas flow. I was Then, in order to release the abnormal gas use state by the return operation and to use the gas appliance, the return operation of opening the valve portion again has been performed manually. In addition, the gas meter was provided with an LED for indicating the open / closed state of the gas passage.

Problems to be Solved by the Invention However, gas meters are often installed outdoors, and it is necessary to go out and perform a resetting operation to return the gas shut-off valve, which is particularly troublesome during busy cooking and the like. Met.

In order to solve this inconvenience, a method of remotely controlling the return operation of the gas shut-off valve electrically from inside the room can be considered. However, although a new method of detecting the position of the valve portion of the shut-off valve and performing an open display was examined, the detection method,
Problems such as an increase in the installation space of the detecting means in a narrow gas meter and an increase in cost are newly generated.

The LED that indicates the open / closed state of the gas passage is
In particular, it is inconvenient to know whether or not the return operation has been accepted by the device during remote operation, and to know only the result of the opening and shutting.

Accordingly, it is an object of the safety device of the present invention to provide a display for notifying that the operation has been accepted by the device when the operation of resetting the gas shut-off valve is electrically operated remotely.

Means for Solving the Problems And the means of the present invention to achieve the above object,
A gas shut-off valve and a flow rate detecting means provided in the gas passage, a shut-off valve driving circuit for outputting a control current of the gas shut-off valve, a switch for receiving a reset operation and outputting a reset operation signal, and a flow rate detecting means for the flow rate detecting means A gas use state based on the signal is compared with a predetermined judgment criterion, a gas use state is monitored and judged, and a flow rate judgment unit for outputting a judgment signal is received. Operation reception signal,
A drive unit that converts and outputs a gas passage open signal and a gas use state abnormal signal, respectively, and responds to each signal by inputting the signal of the drive unit, and notifies a return operation reception, a gas passage open and a gas use state abnormality. An open display unit for performing display is provided in the remote operation unit.

According to the present invention, when a gas safety device is used after a gas safety device shut-off event has occurred, the flow rate determination unit that has received the flow rate detection signal of the flow rate detection means compares the gas usage state with a predetermined determination criterion. Judge the gas use condition abnormal. The shut-off valve drive circuit receiving the determination signal supplies a control current to cut off the gas passage by the gas shut-off valve, and the control current is also input to the drive unit. When the drive section converts the control current into a gas use state abnormal signal and inputs the signal to the open display section, the open display section informs the gas use state abnormality in place of the display indicating the gas passage opening previously displayed. Display. This display indicates that a return operation is necessary.

Therefore, when a correct return operation for canceling the gas shutoff reason is performed and the switch section is returned, a return operation signal is output. Upon receiving this signal, the shut-off valve drive circuit supplies a control current, and the gas shut-off valve temporarily opens the gas passage. On the other hand, the control current is also input to the drive unit and outputs a return operation reception signal to the open display unit. The open display unit receives this signal and performs a display to notify the reception of the return operation. Next, after confirming this display, when the gas is passed through the gas passage using the gas appliance, the flow determining unit compares the gas use state based on the flow rate detection signal of the flow rate detecting means with a predetermined determination criterion and determines that the gas is normal. .
The shutoff valve drive circuit that has received this determination signal supplies a control current and continues to open the temporary gas passage by the gas shutoff valve. On the other hand, the determination signal is also input to the drive unit, converted into a gas passage open signal, and input to the open display unit. Then, the opening display unit performs a display notifying the reception of the return operation, which has been displayed so far, instead of the display notifying the gas passage opening. By this display confirmation, it can be recognized that the return work has been correctly performed, and the return work can be completed.

However, when an incorrect return operation is performed, the gas passage is temporarily opened as in the case of the above-described correct return operation, and a display indicating that the return operation has been accepted is displayed. However, the subsequent operation is completely different. That is, the gas is used next, and the gas flows into the gas passage. However, the same operation as in the case of the above-described abnormal gas use condition is reproduced, and the gas passage that has been temporarily opened until then is shut off again. Then, the open display unit is switched to a display notifying the reception of the return operation, which has been displayed so far, to a display notifying the gas use state abnormality. By this display, it is determined that the correct return operation has not been performed, and the user is notified that the return operation for discovering the cause of the abnormality and canceling it is necessary again.

Example Hereinafter, the open indication device of the gas shut-off valve of the present invention,
The embodiment will be described with reference to the drawings. The gas shutoff valve 1 is provided in the gas passage 2 and is controlled to be opened and closed by a shutoff valve drive circuit 3. The gas passage 2 is provided with a flow rate detecting means 4 for detecting a gas flow rate in an airtight manner. The switch unit 5 for returning the shutoff of the gas shutoff valve 1 is connected to an input port of the microcomputer 6.
P5, the flow detecting means 4 is connected to the input port P1, and the shut-off valve driving circuit 3 is branched from the output ports P3, P4 and the signal line connecting the circuit 3 and the gas shut-off valve 1 to the input port P2.
Respectively. The microcomputer 6 is a port PD
(Two places) are connected to the display unit 7.

The gas shutoff valve 1 has a valve portion 10 that comes into contact with and separates from a valve seat 9 provided in the gas passage 2, a spring 11 that presses the valve portion 10 against the valve seat 9, and a magnetic field generated by a control current output from the shutoff valve drive circuit 3. , A plunger 13 which is excited by the magnetic field and has a valve portion 10 fixed at an end thereof, and a permanent magnet portion 14 having a magnetic force for attracting the plunger 13.

The display unit 7 corresponds to an operation in which the gas passage 2 is opened or shut off by opening and closing the valve unit 10 of the gas shut-off valve 1, and an open display unit 15 for displaying a return operation acceptance, opening of the gas passage, and an indication of an abnormal gas use state. Having.

The microcomputer 6 receives a flow rate detection signal from the flow rate detection means 4 and determines a gas use state based on the signal and a predetermined judgment reference to determine whether the gas use state is normal or not. When the gas use state is abnormal, a control current for shutting off the gas shut-off valve 1 is output to the shut-off valve drive circuit 3, and the open display section 15 displays a signal indicating the gas use state abnormality. If the use state is normal, a display indicating that the gas passage has been opened is displayed on the open display section 15, and further, upon receiving a return operation signal of the gas cutoff valve 1 of the switch section 5, the gas cutoff valve 1 is temporarily provided to the cutoff valve drive circuit 3. A drive unit 18 and the like which output a control current to be opened and simultaneously output signals for indicating to the open display unit 15 that the return operation has been accepted are provided. The flow rate determining unit 17 and the driving unit 18 are connected to each input / output port by a signal line shown by a broken line in the figure.

Based on the above configuration, first, the opening / closing operation of the gas shut-off valve 1 will be described. When a forward current I1 as a control current output from the shutoff valve drive circuit 3 flows in the gas shutoff valve 1, the magnetic field generated by the magnetic coil 12 generates a magnetic force for moving the plunger 13 downward, and the plunger 13 And moves downward, and is attracted to the permanent magnet portion 14. Even after the interruption of the forward current I1, the magnetic force of the permanent magnet 14 attracting the plunger 13 is stronger than the biasing force of the spring 11, and the plunger 13 is held by the permanent magnet 14 by itself. Thus, the valve portion 10 fixed to the plunger 13 is separated from the valve seat 9 to open the gas passage 2, and is kept open even after the forward current I1 is cut off. Also, when a reverse current I2 as a control current flows from the shut-off valve drive circuit 3, the urging force of the spring 11 and the magnetic force of the magnetic coil 12 pushing the plunger 13 upward become stronger than the attraction force of the permanent magnet portion 14, Plunger
The 13 moves away from the permanent magnet section 14 and moves upward, and the valve section 10 comes into close contact with the valve seat 9. Even after the reverse current I2 is cut off, the valve portion 10 is maintained in a state of being in close contact with the valve seat 9 by the urging force of the spring 11, and is held by itself.
Continue to shut off.

Next, each operation of opening the gas passage 2 again by the return operation after the gas shut-off valve 1 shuts off the gas passage 2 and displaying the open state on the open display section 15 will be described.

When the switch unit 5 is operated after the return work, the switch unit 5 is operated.
A return operation acceptance signal is input to the shut-off valve drive circuit 3 via the microcomputer 6, and the shut-off valve drive circuit 3 converts this signal to flow a forward current I 1 to the electromagnetic coil 12,
When the plunger 13 moves downward, the valve section 10 of the gas shut-off valve 1 opens and the gas passage 2 is provisionally opened. On the other hand, the forward current I1 also flows from the shutoff valve drive circuit 3 to the drive unit 18 of the microcomputer 6 again. The drive unit 18 converts this current and inputs a return operation acceptance signal to the open display unit 15. Then, the open display unit 15 performs a display notifying the reception of the return operation.

After the switch unit 5 is operated to display a signal indicating that the return operation of the open display unit 15 has been accepted, when the gas is passed through the gas passage 2 using a gas appliance, the flow determination unit 17 receiving the flow detection signal from the flow detection unit 4 Compares the gas use state based on the flow rate detection signal with a predetermined criterion of the gas use state stored in advance.
Then, when it is determined that the gas use state is correct, the determination signal is input to the shutoff drive circuit 3. Therefore, the shut-off valve driving circuit 3 converts this determination signal into a control current and outputs it.
It is assumed that the valve section 10 of the gas shutoff valve 1 has been opened and the gas passage 2 has been provisionally opened until then. On the other hand, the determination signal is also input to the drive unit 18 and converted into a gas passage open signal, and is input to the open display unit 15 from the display signal line 8. Therefore, the opening display unit 15 switches the display notifying the reception of the return operation to the display notifying the opening of the gas passage. Therefore,
It can be seen that the return work has been completed.

Further, when the flow rate determining unit 17 determines that the gas use state is abnormal due to the failure of the return work, the determination signal is converted by the shutoff valve drive circuit 3 and the reverse current I2 flows through the gas shutoff valve 1. Then, the valve section 10 of the gas shut-off valve 1 is closed and the gas passage 2 is closed.
Switches from provisional opening to shutting off. On the other hand, the reverse current I2 is also input to the drive unit 18, and the gas use state abnormal signal is input to the open display unit 15. Therefore, the open display unit 15 switches the display notifying the reception of the return operation to the display notifying the abnormality of the gas use state, and notifies that the return operation is defective and the re-return operation is necessary.

Although the open display unit 15 is provided near the switch unit 5 which is remotely operated, it may be provided at both locations with the gas meter.

Advantageous Effects of the Invention As is clear from the above description, when the switch section is operated, the open display device for the gas shut-off valve according to the present invention performs a return operation acceptance display indicating that the device has accepted the return operation by the operation signal. In particular, it is possible to visually confirm the reaction in the middle of giving the final result of shut-off / opening when performing a return operation away from the gas meter by remote control. And
Anxiety about whether the device has received the remote operation can be eliminated, and the usability can be improved.

Furthermore, even if the switch unit is installed separately from the gas meter on the indoor side for remote control, space saving becomes possible compared to the position detecting means of the shut-off valve which requires a new installation space in the gas meter, and at the same time economical This can also provide advantageous effects.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a gas shutoff valve open display device according to the present invention. DESCRIPTION OF SYMBOLS 1 ... Gas shutoff valve, 3 ... Shutoff valve drive circuit, 4 ... Flow detection means, 5 ... Switch part, 15 ... Open display part, 17 ...
... Flow rate determination unit, 18 ... Drive unit.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-122819 (JP, A) JP-A-58-179728 (JP, A) JP-A-52-144836 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) F23N 5/26 F23N 5/18

Claims (1)

(57) [Claims] 1. A gas shut-off valve for opening and shutting off a gas passage, a shut-off valve drive circuit for outputting a current for controlling the gas shut-off valve, and a return operation signal for receiving a return operation and temporarily opening the gas passage. A switch unit that outputs to the shut-off valve drive circuit, a flow rate detection unit that detects a gas flow rate in the gas passage, and compares a gas usage state based on a flow rate detection signal of the flow rate detection unit with a predetermined determination criterion, and determines the gas usage state. A flow determining unit that determines and outputs a determination signal; and a gas passage that receives a current of the shutoff valve drive circuit and receives a determination signal from the flow determination unit as a return operation reception signal and continuously opens the gas passage. A drive unit that converts and outputs an open signal and a gas use state abnormal signal that shuts off a gas passage, respectively, and a drive operation corresponding to each signal by inputting each of the signals of the drive unit, receiving a return operation, opening a gas passage, and using a gas. Opening the display device of the gas shut-off valve provided in the remote control unit to open the display unit that performs display to inform normal.