KR20060111911A - Sensing method of valve operation and the apparatus - Google Patents

Abstract

A method and an apparatus for detecting manipulation of a valve are provided to detect the manipulation of the valve by using a detection wire. In a method for detecting manipulation of a valve, a detection wire(10) is installed in a case body(14) instead of a safety pin or a seal. If the valve is arbitrarily manipulated, the detection wire is cut to detect an electrical change. The detection wire is coated to prevent the change of the resistance due to the interference with the valve. A switch and a pressing unit are installed in the case body if the case body is opened to show the same effect as cutting of the detection wire.

Description

Valve operation detection method and device {SENSING METHOD OF VALVE OPERATION AND THE APPARATUS}

1 shows an example of a valve installed in a typical city gas system,

2 is a view showing in detail the structure of the valve shown in FIG.

3 is a view showing an example in which a mechanism for preventing operation of a valve in the related art is provided;

4 is a perspective view of a valve operation detecting sensor according to the present invention;

5 is a circuit diagram of a valve operation detecting sensor according to the present invention;

6 is an equivalent circuit diagram of a valve operation detecting sensor according to the present invention;

7 is a perspective view showing a specific example applying the valve operation detection sensor according to the present invention.

* Explanation of symbols for main parts of the drawings

1 --- inlet valve, 2 --- outlet valve,

3 --- bypass valve, 4 --- gas meter,

5 --- valve body, 6 --- valve shaft,

7 --- home, 8 --- thin line,

9 --- sealed, 10 --- sense line,

11 --- switch, 12 --- pusher,

13 --- connector, 14 --- case body,

15 --- case hooks, 16 --- cables,

17 --- sealed, 100 --- sensor circuit,

200 --- remote meter or remote monitor, 201 --- input circuit.

The present invention relates to a method and apparatus for detecting the operation of a valve installed in a pipe for supplying a fluid or a gas, in particular a valve for preventing tampering.

Normally, a valve is installed in a pipe for transferring gas or fluid to block the flow of the fluid or to adjust the flow rate. In this case, it is normal for the valve to always remain closed depending on the purpose of use, and it may be normal for the valve to always remain open.

In order to prevent inadvertent operation of the valve due to inadvertent use or intentional use in such a steady state, the valve is provided with a safety pin and a seal. However, in such a mechanism, the operator cannot detect whether the valve is operated until the operator goes out and inspects it, and there is no sensing device that can be immediately determined.

Fig. 1 shows an example of a valve installed in a typical city gas system, and shows a case where a large capacity gas demand is installed and a demand cannot be stopped.

As shown in Fig. 1, when replacing or repairing the gas meter (Meter) 4, the valve 1 provided on the inlet side and the valve 2 provided on the outlet side are shut off, and the bypass valve 3 ), The gas meter 4 can be replaced or repaired while the gas is supplied continuously. In this case, the bypass valve 3 should be kept shut at all times except in the case of repair. This is to allow accurate gas consumption to be measured. However, there are often cases of opening valves for the purpose of using gas unfairly.

FIG. 2 is a view showing the structure of the valve shown in FIG. 1 in detail. A groove 7 may be provided between the valve body 5 and the valve shaft 6 to install a safety pin or seal for prevention of unauthorized operation. have.

3 shows an example in which a mechanism (that is, seal) for preventing operation of a valve in the related art is provided. That is, the seal 9 connected with the thin wire 8 through the groove | channel 7 provided between the valve body 5 and the valve shaft 6 is provided. However, in such a case, even if the seal 9 is dismantled or the thin wire 8 is cut off in order to use the gas unfairly, it is difficult to check, and even if it is seen and known in the future, it is difficult to find the operation point. there is a problem.

The present invention has been made to solve the above problems, the object is to install a sensing line in place of the existing safety pin or seal in the valve installed in the pipe for supplying the fluid or gas, whether the short circuit or electrical resistance of the sensing line It is to provide a stepless detection method and apparatus for detecting the operation of the valve by the change of. In this case, the detection signal may be supplied to, for example, a remote meter reader or a remote monitoring device.

In order to achieve the above object, the valve operation detecting method of the present invention is a method of operating a meter reading or sensing system in which safety pins or seals are installed in order to prevent unauthorized operation of the valve. It is characterized in that the sensing line is cut during the stepless operation of the valve to detect an electrical change.

Moreover, in order to prevent the change of resistance by the interference with a valve, the said sensing line is coat | covered.

Furthermore, in order to create the same effect as opening the case body to cut the sensing line, a switch and a pressing device are provided in the case body.

In addition, the remote meter reading and the remote monitoring device of the present invention is characterized by having an input circuit for detecting the state of the valve by using the electrical change output by the above method.

(Example)

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

4 is a perspective view of a valve operation detection sensor according to the present invention.

As shown in FIG. 4, the valve operation detecting sensor according to the present invention includes a case body 14 having a lid, and a connection terminal 13 to which a sensing line 10 can be connected inside the case body 14. ) And a switch 11 for detecting that the lid is opened. The sensing line 10 is installed in a groove for preventing the operation of the valve and is cut at the time of operating the valve to detect an electrical change of the circuit (that is, a change in electrical resistance). In addition, the case main body 14 is provided with a pressing device 12 that allows the switch 11 to be turned ON when the lid is completely closed in order to prevent rain water, moisture, or the like from entering. This is to prevent the arbitrary operation of the internal circuit by opening the case body 14 in order to arbitrarily operate the valve, in addition to the purpose of installing the sensing line 10. When the lid is opened, the sensing line 10 is cut off. It is possible to output a signal having the same effect. In other words, the switch 11 and the pressing device 12 in the case main body 14 are provided to create the same effect as the sensing line 10 is cut when the case main body 14 is opened. On the other hand, as the sensing wire 10, it is preferable to use a coated resistance wire in order to prevent a change in the electrical resistance upon contact with the valve body.

In addition, the case main body 14 can also be provided with the case hook 15. By using the ring 15, the seal 17 may be connected by a predetermined thin line, or a warning sticker such as caution may be attached.

The case body 14 and the input circuit 201 of the remote meter reader or the remote monitoring apparatus 200 are connected by a cable 16. In this case, a coaxial cable or a shielded cable is used as the cable 16.

Next, the operation of the valve operation detection sensor according to the present invention configured as described above will be described in detail.

5 is a circuit diagram illustrating an example in which a valve operation detecting sensor according to the present invention is connected to a remote meter reader or a remote monitoring apparatus 200 by a cable 16.

As shown in FIG. 5, a sensing line 10 is provided in the sensing line connecting terminal 13, and the sensing line 10 is turned off when the case body 14 is opened in series with the sensing line 10. The switch 11 is connected. The sensor circuit 100 is connected to the input circuit 201 of the remote meter or remote monitoring device 200 by a cable 16, and the sensor circuit 100 is connected to the sensor circuit 100 by the remote meter or remote monitoring device 200. It is possible to detect the change of electric signal.

6 is an equivalent circuit diagram of a valve operation detecting sensor according to the present invention.

As shown in Figure 6, R represents the resistance of the internal circuit of the remote meter or remote monitoring device 200 and the resistance of the sensing line 10 of the present invention, and can be assumed to have the same resistance value, so as R The same notation is written.

On the other hand, in the sensor, when the lid is closed, that is, when the switch 11 for detecting the state of the case body 14 is in the ON state, the output voltage of the sensor is 1/2 of the supply voltage. To keep it. However, when the sensing line 10 is cut off due to an arbitrary operation of the valve (for example, stepless operation) or the lid of the case body 14 is opened to turn the state sensing switch 11 off. The output voltage is made equal to the supply voltage.

According to the present invention configured as described above, when the sensing line 10 is cut by the operation of the valve or the lid of the case main body 14 is opened by stepless operation, the supply voltage Vcc is output, and in the normal state, Vcc / 2, which is 1/2, is output so that stepless operation of the valve can be detected through two state changes.

That is, Vcc = "abnormal state" = "H"

   Vcc / 2 = "Normal" = "L"

Can be recognized as a digital signal.

7 is a view of a specific example in which the valve operation detection sensor according to the present invention is installed in the gas supply pipe. In this example, a warning sticker is affixed and the seal 17 is connected to the ring formed in the sticker.

As described above, according to the method and apparatus for detecting an operation of the valve for preventing stepless operation of the present invention, it is possible to detect an electrical signal from a sensing line provided to prevent the stepless operation of the valve, thereby enabling remote meter reading or remote monitoring. It can be used in the system, prevents accidents caused by unauthorized operation of the valve, and detects the unfair use of fluids or gases.

Claims (4)

In the operation method of the meter or detection system equipped with a safety pin or seal to prevent unauthorized operation of the valve, Valve operation, characterized in that the detection line 10 is installed in the case body 14 in place of the safety pin or seal so that the detection line 10 is cut during the stepless operation of the valve to detect the electrical change. Detection method. The valve operation detection method according to claim 1, wherein the detection line (10) is covered to prevent a change in resistance due to interference with the valve. The switch 11 and the pressing device (3) in the case body (14) according to claim 1 or 2, in order to create the same effect as opening the case body (14) so that the sensing line (10) is cut. 12) valve operation detection method characterized in that to install. A remote meter reading device and a remote monitoring device comprising an input circuit 201 for detecting a state of a valve by using an electrical change output by the method of claim 1.

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