JPH04262231A - Apparatus for measuring amount of leaking gas - Google Patents

Abstract

PURPOSE:To shorten the time wherein a device is left alone and to improve the sensitivity in leakage detection by once acquiring the gas component to be detected in atmospheric gas, recovering he gas component into a container having the specified volume, and measuring the concentration of the gas component to be detected with a gas analyzer. CONSTITUTION:A suction pump 4 is operated. Atmospheric gas flows into a flowmeter 5 through a gas catching part 6, and the amount of the gas is measured. At this time, a heating and cooling pat 6f of the gas catching part 6 is made to be in a cooled state. The action of a barrier part 6g is added, and an adsorbing part 6e is excellently cooled. Therefore, the gas to be detected is adsorbed on activated carbon. Then, the heating and cooling part 6f is made to be heated state. An opening and closing valve 7 is closed, and an opening and closing valve 9 is opened. When a pump 4 is rotated in the reverse direction, the gas to be detected which is adsorbed on the activated carbon is desorbed and recovered into a container 8 together with the atmospheric gas. Since the container 8 has the constant volume, the concetration of the gas to be detected can be measured when the valve 9 is closed under the state wherein the atmospheric pressure is reached, the pump 4 is stopped and the atmospheric gas in the container 8 is analyzed with a gas analyzer.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas leakage measuring device for measuring the leakage state of gas sealed in sealed electrical equipment or the like.

0002

[Prior Art] Figure 3 shows a conventional ultraviolet ionization type SF of this kind.
6 is a diagram showing a schematic configuration of the main parts of the gas leakage measuring device. In the figure, 1 is an inlet, 2 is a filter that removes dust in the atmospheric gas inhaled through the inlet 1, 3 is a detection unit, and 4 is a suction that guides the atmospheric gas to the detection unit 3 through the inlet 1. It's a pump.

In the conventional SF6 gas leak amount measuring device configured as described above, first, when the suction pump 4 is activated, the atmospheric gas containing a small amount of SF6 gas divided around the seal portion (not shown) is , and are guided to the detection section 3 and ionized. At this time, since the mobility of oxygen ions and SF6 ions is different, a phase difference occurs in the current flowing through the electrodes.
The concentration of gas is measured.

0004

[Problem to be Solved by the Invention] Since the conventional gas leakage measuring device is constructed as described above, in order to increase the leakage detection sensitivity within a certain detection limit of the device, it is necessary to
There was a problem in that the leaked SF6 gas had to be stored in a space surrounded by vinyl etc. for a long time.

[0005] This invention was made to solve the above-mentioned problems, and it is a gas leakage measurement method that can increase the leakage detection sensitivity within a certain detection limit of the device even if the exposure time is shortened. The purpose is to provide a device.

[0006]

[Means for Solving the Problems] A gas leakage measuring device according to the present invention captures a test gas component in an atmospheric gas in a test gas component trapping section, and stores the captured gas component in a container having a predetermined volume. The test gas component is collected together with the atmospheric gas, and the concentration of the test gas component in the container is measured using a gas analyzer.

[0007]

[Operation] The gas leakage measuring device of the present invention temporarily captures the test gas component in the atmospheric gas in the test gas component capturing section, collects the test gas component in the atmospheric gas together with the atmospheric gas, and collects the test gas component in the atmospheric gas. By increasing the concentration of gas and performing gas analysis, we aim to shorten the storage time.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a gas leakage measuring device according to an embodiment of the present invention. In the figure, inlet 1
and the suction pump 4 are similar to those of the conventional device in FIG. 5 is a flow meter that measures the atmospheric gas sucked in through the suction port 1 by the suction pump 4, and 6 is a sample gas component capture unit connected between the suction port 1 and the suction pump 4, as shown in FIG. It is configured as follows.

That is, 6a is a housing, 6b is a container housed in the housing 6a, and a gas inlet 6c connected to the suction port 1 side and a gas outlet 6d connected to the suction pump 4 side are provided at both ends. It is being 6e is an adsorption part made of activated carbon or the like filled in the container 6b, 6f is a heating/cooling part formed to surround the container 6b and is made of a Peltier element etc. that heats and cools the adsorption part 6e, and 6g is an inner surface of the container 6b. 7 is a first on-off valve connected between the inlet 1 and the sample gas component capture section 6; 8 is a barrier formed protruding from the first on-off valve 7 and the sample gas component capture section; It is a container having a predetermined volume that is branched and connected from between 6 and 6 via a second on-off valve 9.

Next, the operation of the gas leakage measuring device according to an embodiment of the present invention constructed as described above will be explained. First, when the suction pump 4 is activated, the seal part (
Atmospheric gas containing a minute amount of the test gas component (hereinafter referred to as SF6 gas) divided around the surrounding area (not shown) flows through the test gas component capture section 6 to the flowmeter 5 and its amount is measured. At this time, the heating and cooling section 6f of the gas component capture section 6 to be detected is in a cooling state, and the adsorption section 6e is well cooled due to the action of the barrier 6g, so SF6 gas is actively adsorbed to the activated carbon. and captured.

Next, when the heating/cooling section 6f is heated, the first on-off valve 7 is closed, the second on-off valve 9 is opened, and the suction pump 4 is rotated in the reverse direction, the SF6 gas adsorbed on the activated carbon is removed. is desorbed and collected into the container 8 together with the atmospheric gas. Since the container 8 has a predetermined constant volume, when the atmospheric pressure is reached, the second on-off valve 9 is closed and the suction pump 4 is stopped to drain the atmospheric gas containing a large amount of SF6 gas in the container 8. SF6 was analyzed using a gas analyzer (not shown).
Measure the amount of gas.

[0012]The leakage amount (l) of SF6 gas is
It is calculated as v=X×V0, X0=X×V0/V1. In the formula, v is the SF6 gas leakage amount (l), V
1 is the amount of atmospheric gas (l) measured by the flowmeter 5, V
0 indicates the volume (l) of the container 8, X indicates the concentration of SF6 gas (PPM) measured by a gas analyzer, and X0 indicates the concentration of SF6 in the atmospheric gas (PPM).

Although the gas analyzer is not limited to any particular model, if the analyzer is made portable, the device will be extremely small, so it can be used in several tens of units, unlike conventional gas chromatographs. Kg, which is very large compared to the object to be measured, which limited the range of application, but it is now easier to carry and the range of application has been expanded. Further, in the above embodiment, SF6 gas was used as an example of the gas component to be detected, but it goes without saying that the present invention is not limited to this and can be applied to other gas components to be detected. In this case, the effect can be further enhanced by appropriately selecting the adsorbent for the adsorption section 6e of the test gas component capturing section 6 depending on the type of test gas component.

[0014]

As described above, according to the present invention, the test gas component in the atmospheric gas is once captured by the test gas component trapping section, and the test gas component is transferred to the container having a predetermined volume. Since the concentration of the gas component to be detected in the container is measured using a gas analyzer, it is possible to increase leak detection sensitivity within a certain detection limit of the device even if the exposure time is shortened. Furthermore, by making the analyzer portable, it is possible to provide a gas leakage measuring device that can be used in an expanded range of applications, which is an excellent practical effect.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic configuration of a gas leakage measuring device in an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the configuration of a gas component capturing section to be detected, which constitutes a main part of the gas leakage measuring device in FIG. 1;

FIG. 3 is a diagram showing a schematic configuration of a conventional gas leak amount measuring device.

[Explanation of symbols]

1 Suction pump 5 Flow meter 6 Test gas component capture unit 8 Container

Claims (2)

[Claims] 1. A pump that sucks atmospheric gas from a gas space to be measured, and capture of a gas component to be detected by adsorbing the gas component in the sucked atmospheric gas with an adsorption unit that can be heated and cooled. a flowmeter for measuring the sucked atmospheric gas, a container having a predetermined volume for collecting the test gas component captured by the test gas component capture section together with the atmospheric gas, and the container. A gas leak amount measuring device comprising: a gas analyzer for measuring the concentration of the gas component to be detected; 2. The gas leak amount measuring device according to claim 1, wherein the gas analyzer is portable.