JPH0674396A - Gas filling method - Google Patents

Abstract

PURPOSE:To provide a method by which gas can be filled in vessels with various kinds of weight accurately by a simple operation. CONSTITUTION:A measuring vessel S whose weight and volume are known is connected to the same gas source 7 as that of vessels A, B, C to be filled so that gas filling can be started simultaneously. When the weight of the measuring vessel S is measured by a balance 8 and gas with a desired weight is filled in the vessel, gas filling to the vessels A, B, C to be filled is finished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas filling method,
More specifically, it relates to a method of filling a single gas or a gas having a predetermined composition ratio into a container, and a method of filling the gas into the container by a gravimetric method.

[0002]

2. Description of the Related Art When a gas is charged in a container for trading, the gas is usually charged in the container at 35 ° C. to 150 atmospheric pressure for trading. As a gas filling method for this purpose, while the gas is being filled in the container, the temperature of the gas at that time is measured on the side wall of the container, and the temperature of the side wall and the filling pressure are used to measure 35 ° C.
A pressure method is used in which the pressure is adjusted to 150 atm. However, in this pressure method, the temperature of the gas being filled does not exactly match the temperature of the side wall of the container, and the temperature of the side wall varies depending on the measurement position, the state of the atmospheric wind, etc. Difficult to fill.

Therefore, recently, a weight method has been performed in which the weight of the filling gas when a predetermined amount of gas is filled in the container is calculated and the gas of the filling gas weight is filled in the container.
According to this gravimetric method, the amount of gas filled in the container can be accurately filled because it is measured by weight regardless of temperature and pressure.

[0004]

However, in the conventional gravimetric method, the weight of the container filled with gas has to be measured for each container, so that the filling work is troublesome. Moreover, since the weight of the containers in the market is 10 kg to 90 kg, and the majority of the containers are as heavy as about 50 kg, a scale with a maximum measurable weight (range) is required, and
Since the measurement accuracy of the weight of the gas filled in the container is as small as several g, a highly accurate balance is required. Therefore, it is necessary to install an expensive scale such as an electronic weighing scale or prepare a plurality of scales according to the weight of the container.

Further, as described in JP-A-61-118128, by partially immersing the container in water and utilizing the buoyancy, the weight of the container can be reduced and the measurement accuracy can be improved. Proposed, but this method also makes container 1
Not only need to be done for each book, but also a device for holding the container in the water is required, and its desorption is troublesome, and further, the work to wipe the water after filling the gas is necessary because the container gets wet with water. The filling work was troublesome.

In view of the above-mentioned inconvenience, it is therefore an object of the present invention to provide a method which can be filled more easily than in the past and which can accurately fill a gas of various weights with a single scale.

[0007]

In order to achieve the above-mentioned object, the gas filling method of the present invention is such that a calibration container having a known weight and volume is connected to the same gas source as the container to be filled and the gas is filled at the same time. It is characterized in that the gas filling of the container to be filled is started when the desired weight of gas is filled in the calibration container, and this gas filling method is different. The method is characterized in that a plurality of gases are sequentially processed to fill the container to be filled with the mixed gas having a desired composition ratio.

[0008]

[Operation] According to the above configuration, since the calibration container and the container to be filled are connected to the same gas source, they all have the same pressure at the end of gas filling. Therefore, the weight of the gas when the gas is filled in the calibration container at a desired temperature and pressure is calculated in advance, and when the gas of the filling gas weight is filled in the calibration container, the gas When the filling is completed, the filling container is filled with the gas filled at the desired temperature and pressure.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail based on an embodiment shown in the drawings. FIG. 1 is a view for explaining the gas filling method of the present invention, in which calibration containers S and 3 are provided.
Each container valve V of the individual containers A, B, and C to be filled is connected to a main filling pipe 5 via filling branch pipes 1, 2, 3, 4, and the main filling pipe 5 is connected via a gas supply valve 6. It is connected to the gas source 7. The calibration container S is placed on the scale 8,
It is possible to measure the weight at all times. The weighing container S
Is preferably small and lightweight, and the volume and weight in vacuum are known and have been measured in advance.

For example, when the containers A, B, and C to be filled are each filled with an amount of gas corresponding to 150 atm at 35 ° C., the calibration container S has the same temperature and pressure, that is, 150 atm at 35 ° C. The filling gas weight Ws when filling a corresponding amount of gas is obtained in advance. In this case, since the volume of the calibration container S is known, the filling gas weight Ws can be easily calculated.

Next, the weighing container S and the filled containers A, B,
Each container valve V of C is opened, and then the gas supply valve 6 is opened to start gas filling of each container S, A, B and C at the same time. Then, when the weight measurement value of the scale 8 becomes the sum of the self-weight of the calibration container S and the filling gas weight Ws, the gas supply valve 6 is closed to complete the gas filling. By doing this, since the containers S, A, B, and C are at the same pressure at the end of the gas filling, when the calibration container S is filled with a gas corresponding to 150 atm at 35 ° C., Filled containers A of different sizes,
Each of B and C was also filled with an amount of gas corresponding to 150 atm at 35 ° C.

When the containers A, B and C to be filled are filled with a predetermined amount of gas, each container valve V is closed and the containers A, B and C to be filled are filled.
Remove. After that, after the gas in the main filling pipe 5 and the calibration container S is released, another container to be filled is connected in the same manner as described above to perform the filling. In this case, when the same gas is continuously filled, no special operation is required, but when changing the gas to be filled in the container to be filled, an exhaust pump is provided in the filling main pipe 5 so as not to mix the gases. The filling main pipe 5 and the inside of the calibration container S are evacuated in a continuous manner.

In the above embodiment, the case where a single gas is filled in the container has been illustrated. However, if the filling method is performed in a predetermined order using a plurality of different kinds of gas, a desired gas is filled in the container. A mixed gas of composition can be produced and filled.

In this case, the weight of the filling gas corresponding to each composition ratio in the case where the calibration container S is filled with gas at a predetermined composition ratio is calculated in advance, and as shown in the figure, the main filling pipe 5 is filled. A second gas source 12 is connected in series via a second gas supply valve 11 indicated by a broken line in FIG. 1, and after the gas filling of the gas source 7 is completed and the gas supply valve 6 is closed, The supply valve 11 may be opened to fill the gas from the second gas source 12. When the composition ratio of the mixed gas to be obtained is the volume ratio, the weight of the filling gas may be calculated by converting it to the weight ratio.
Furthermore, when mixing three or more kinds of gases, the same procedure as above may be performed.

[0015]

As described above, according to the present invention,
If one calibration container is filled with a gas corresponding to a desired temperature and pressure by the gravimetric method, one or more containers to be filled simultaneously are also filled with the gas under the same conditions. Since there is no need to measure the weight, the filling work can be greatly simplified. Further, it suffices that there is only one scale dedicated to the weighing container, and since the weighing container that is smaller than the filling container can be used, the range can be narrowed and the weight measurement accuracy can be improved.

Since the calibration container is dedicated to calibration and does not require mechanical strength to withstand vibration and shock during transportation, it is made of aluminum, titanium, plastic or the like while conforming to the high pressure gas control method. It is also possible to reduce the weight, and it is possible to perform gas filling with higher accuracy.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

[Explanation of symbols]

1, 2, 3, 4 ... Filling branch pipe 5 ... Filling main pipe 6
... Gas supply valve 7 ... Gas source 8 ... Scale 11 ... Second gas supply valve
12 ... Second gas source A, B, C ... Filled container S ... Calibration container V ...
Container valve

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hideo Kitamura Digital Engineering Co., Ltd. 2-17-3 Yukiura, Kanazawa-ku, Yokohama-shi, Kanagawa

Claims (2)

[Claims] 1. A method of filling gas into a container, comprising:
When a weighing container of known weight and volume is connected to the same gas source as the container to be filled and gas filling is started at the same time, and a desired weight of gas is filled in the weighing container, A gas filling method characterized by terminating the gas filling. 2. The gas filling method according to claim 1, wherein a plurality of gases of different types are sequentially performed to fill a mixed gas having a desired composition ratio in a container to be filled. .