JPH04104555U - Gas sampling adapter - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the purity of the gas to be measured in a gas sampling adapter for sampling the gas sealed in gas-filled electrical equipment and introducing it into an analyzer. [Structure] A first opening/closing valve 15 that introduces the gas to be measured in the equipment container 1 into the sealed container 13 when opened, and a first on-off valve 15 that connects the inside of the sealed container 13 with the atmosphere when opened. Opening and closing of the second on-off valve 17 for discharging the gas to be measured into the atmosphere is alternately repeated a predetermined number of times depending on the pressure of the gas to be measured in the equipment container 1.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a gas sampling adapter that samples SF ₆ gas sealed in, for example, an electrical device filled with SF ₆ gas and introduces it into an analyzer for gas component analysis.

0002

[Conventional technology]

FIG. 5 is a diagram showing a schematic configuration of a conventional gas sampling device disclosed in, for example, Japanese Utility Model Publication No. 57-363. In the figure, 1 is a container of an SF ₆ gas-filled electrical device in which SF ₆ gas 2 is sealed, 3 is a gas detection device connected to the container 1 via a gas pipe 4, and the gas pipe 4 is a connecting means. 5. 6 is an on-off valve provided in the gas pipe 4 to open and close the SF ₆ gas flowing therein, and 7 is a flow rate control valve provided in the gas pipe 4 to adjust the amount of SF ₆ gas flowing therein to a constant level.

[0003] Next, the operation will be explained. First, the flow rate regulating valve 7 is adjusted to a predetermined flow rate in advance, and the gas detection device 3 is connected to the gas pipe 4 by the connecting means 5 with the on-off valve 6 closed. Next, the on-off valve 6 is opened to allow a constant flow rate of SF ₆ gas 2 to flow into the gas detection device 3 via the flow rate control valve 7, and any abnormality in the SF ₆ gas 2 is detected.

0004

[Problem that the idea aims to solve]

Conventional gas sampling equipment is configured as described above, so gas detection equipment 3 is an example. For example, it is effective for things that indicate color change due to reaction, such as gas detection tubes. However, when detecting the concentration of components such as with a gas chromatograph, injection The problem is that it is difficult to apply because it is necessary to accurately detect the amount of gas. There was a point. This idea was made to solve the above problems, and the amount of gas injected was It is used in places where the concentration of components can be detected using a gas chromatograph, etc. The purpose of the present invention is to provide a gas sampling adapter that can be used in various cases.

[0005]

[Means to solve the problem]

The gas sampling adapter according to this invention can be opened to remove the object to be measured inside the equipment container. A first on-off valve that introduces gas into the sealed container, and a first opening/closing valve that opens the gas into the sealed container. Opening and closing with a second on-off valve that communicates with the atmosphere and discharges the gas to be measured in the sealed container into the atmosphere. are alternately repeated a predetermined number of times depending on the pressure of the gas to be measured in the equipment container. This is what I did.

[0006]

[Effect]

The first and second on-off valves of the gas sampling adapter in this invention are It is designed to alternately open and close a predetermined number of times depending on the pressure of the gas to be measured inside. This method replaces the residual gas in the sealed container with the inhaled gas to be measured. After increasing the purity of the measurement gas, the third on-off valve is opened and the gas is led to the analyzer.

[0007]

【Example】

An embodiment of this invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a case where a gas sampling adapter according to an embodiment of the present invention is connected between an electric device filled with SF ₆ gas and a portable gas chromatograph for component analysis. FIG. 2 is a diagram showing a schematic configuration of a gas sampling adapter according to an embodiment of this invention. In each figure, 1 is a container of an SF ₆ gas electrical equipment in which SF ₆ gas 2 as a gas to be measured is sealed, 8 is a portable gas chromatograph as an analysis device, and 9 and 10 are gases to be measured in container 1. These are on-off valves provided in the outlet pipe 11 and the gas to be measured inlet pipe 12 of the portable gas chromatograph 8, respectively.

[0008] 20 is a gas sampling adapter, which connects the sealed container 13 and this sealed container as shown in Figure 2. The first on-off valve 15 provided on the gas pipe 14 branching from 13 and the same as the gas pipe 14 A second on-off valve 17 provided in the gas pipe 16 branching from the sealed container 13 and the gas pipe 16 Similarly, it consists of a third on-off valve 19 provided in a gas pipe 18 branching from the sealed container 13. has been completed. As shown in FIG. 1, the gas pipe 14 is connected to the measured gas outlet pipe 11. The gas piping 18 is connected to the gas introduction piping 12 to be measured through connection means (not shown). The ends of the 16 gas pipes are open to the atmosphere.

Generally, in order to monitor the operating status of electrical equipment filled with SF ₆ gas, for example, the presence or absence of internal abnormalities is determined by sampling the enclosed SF ₆ gas and analyzing its components with an analyzer. . The gas sampling adapter 20 in one embodiment of this invention collects SF ₆ gas as the gas to be measured from the equipment container 1 into the sealed container 13, increases the purity in the sealed container 13, and then uses it as an analyzer. It plays the role of leading to the portable gas chromatograph 8.

Next, the operation of the gas sampling adapter in one embodiment of this invention will be explained. First, the gas pipes 14 and 18 are connected to the gas to be measured outlet pipe 11 and the gas to be measured inlet pipe 12, respectively, and the gas sampling adapter 20 is connected to the equipment container 1 and the portable gas chromatograph 8. Then, with the second and third on-off valves 17 and 19 closed, the first on-off valve 15 is opened, and the SF ₆ gas in the equipment container 1 is introduced into the sealed container 13. When the gas pressure reaches the gas filling pressure in the equipment container 1, the first on-off valve 15 is closed to stop the introduction.

When the introduction of SF ₆ gas into the sealed container 13 is stopped, the second on-off valve 17 is opened to discharge the SF ₆ gas in the sealed container 13 into the atmosphere. close again. This operation, that is, the opening and closing operation of the first and second on-off valves 15 and 17 is repeated alternately until reaching the number of times determined by the SF ₆ gas filling pressure in the equipment container 1, and the sampling operation is completed. Note that during these series of operations, the on-off valve 9 is kept open.

0012 Next, the number of repetitions of the alternating opening and closing operations of the first and second on-off valves 15 and 17 described above is repeated. and SF in equipment container 1₆The relationship with gas filling pressure will be explained. Now, the concentration of residual gas in sealed container 13 is C, and SF in equipment container 1 is₆gas filling pressure If P is the atmospheric pressure Po, and the number of repetitions is n, then C=(Po/P)ⁿ ………… So, since Po=1 atm, C=(1/P)ⁿ ………… becomes. i.e. for example SF₆Filling pressure of gas 2 is 4kg/cm²・If G, then the expression When the number of repetitions n is 4, the concentration C of the residual gas decreases to about 0.4%, and the desired SF is achieved. ₆ The concentration of gas 2 is 99.5% or more, making it a highly pure gas to be measured. In addition, the first The operation of alternately opening and closing the on-off valve 15 and the second on-off valve 17 is performed using a general timer and reset valve. It is controlled by a relay or a microcomputer.

The high-purity SF ₆ gas 2 collected in the sealed container 13 is sucked by the gas sampling suction pump of the portable gas chromatograph 8 by opening the on-off valve 10 and the third on-off valve 19. The gas is introduced into the portable gas chromatograph 8, the amount of gas is calibrated, and then analyzed. For this reason, it is recommended to reduce the amount of residual gas in the gas piping 18 and the third on-off valve 19 by reducing the internal volume of the gas piping 18 and the third on-off valve 19 as much as possible to improve the accuracy of the analysis. In order to save time, a structure as shown in FIG. 3 is used as the third on-off valve 19.

In FIG. 3, reference numeral 19a is a housing made of a non-magnetic material provided in the gas pipe 18, and a relief portion 19b is formed in the lower part. 19c is a stopper made of a magnetic material that blocks the gas flow path to interrupt the flow; 19d is an electromagnet disposed in the relief portion 19b; and 19e is an electromagnet disposed in the closed portion of the stopper _19c . While the gas 2 is being collected into the sealed container 13, the electromagnet 19e is energized to guide the stopper 19c to the closed part to close the flow path, and the SF ₆ gas 2 collected in the sealed container 13 is transferred to the portable gas chromatograph 8. When the flow path is introduced into the flow path, the electromagnet 19e is deenergized and the electromagnet 19d is energized to move the stopper 19c toward the relief portion 19b and open the flow path.

[0015] Furthermore, even if the third on-off valve 19 has the structure shown in Fig. 4, it is shown in Fig. 3. It has the same effect as that. That is, in the figure, 19f is a casing made of a non-magnetic material provided in the gas pipe 18. , 19g is always biased by spring 19h to block the gas flow path and cut off the flow. The stopper 19i made of magnetic material is biased by the biasing force of the spring 19h. It is an electromagnet that moves the stopper 19g in the direction of overcoming the flow path and opening the flow path. ₆ While gas 2 is being collected into the sealed container 13, the electromagnet 19i is deenergized and the spring 19h is used to release the gas. Press the stopper 19g against the blockage part to block the flow path, and the SF collected in the sealed container 13 ₆ When introducing gas 2 into the portable gas chromatograph 8, energize the electromagnet 19i. to open the flow path by moving the stopper 19g.

In this way, if the third on-off valve 19 is configured as shown in FIGS. 3 and 4, the structure will be simpler and smaller than commercially available on-off valves, etc., and the amount of residual gas will be minimized. It is possible to keep it to a minimum. Furthermore, by combining the gas sampling adapter 20 with the portable gas chromatograph 8, the gas sampling suction pump can also be used with the portable gas chromatograph 8, making it extremely compact and easy to carry, making it convenient to use. become. In each of the above embodiments, the case where SF ₆ gas 2 was used as the gas to be measured was explained, but the same method can be applied even when other gases having a sealing pressure higher than atmospheric pressure are used in a sealed device. Needless to say, it is effective.

[0017]

[Effect of the idea]

As described above, according to this invention, the sealed container and the inside of the equipment container can be opened by opening the sealed container. a first on-off valve that introduces the gas to be measured into the sealed container; The inside of the sealed container is communicated with the atmosphere and the gas to be measured in the sealed container is discharged into the atmosphere. a second on-off valve, which when opened leads the gas to be measured in the sealed container to the branching device; and a third on-off valve for controlling the opening and closing of the first and second on-off valves. By alternately repeating the predetermined number of times according to the pressure of the gas to be measured in the instrument. , the residual gas in the sealed container is replaced with the gas to be measured, and the purity of the gas to be measured in the sealed container is determined. By increasing the amount of energy and directing it to the analyzer, components such as gas chromatographs, etc. We can provide gas sampling adapters that can also be used to detect the concentration of Wear.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic configuration of a gas sampling adapter according to an embodiment of the invention connected between an instrument container filled with a gas to be measured and an analyzer.

FIG. 2 is a diagram showing a schematic configuration of a gas sampling adapter in an embodiment of the invention.

FIG. 3 is a sectional view showing an embodiment of a third on-off valve that constitutes a main part of the gas sampling adapter in FIG. 2;

FIG. 4 is a sectional view showing another embodiment of a third on-off valve that constitutes a main part of the gas sampling adapter in FIG. 2;

FIG. 5 is a diagram showing a schematic configuration of a conventional gas sampling device.

[Explanation of symbols]

1 Equipment container 2 SF ₆ gas as the gas to be measured 8 Gas chromatograph as an analyzer 13 Sealed container 15 First on-off valve 17 Second on-off valve 19 Third on-off valve 20 Gas sampling adapter

Claims (1)

[Scope of utility model registration request] 1. A sealed container, a first on-off valve that, when opened, introduces a gas to be measured in the equipment container into the sealed container; The second part discharges the gas to be measured in the sealed container into the atmosphere.
an on-off valve, and a third on-off valve that, when opened, leads out the gas to be measured in the sealed container to the analyzer; A gas sampling adapter characterized in that the gas sampling adapter is configured to alternately repeat a predetermined number of times depending on the sealed pressure of the gas to be measured.