JPS5822945Y2 - Siphon tube in pressure fluid filled container - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a siphon pipe for extracting a liquefied mixed fluid from a container filled with a liquefied mixed fluid containing components having different boiling points (for example, ethylene oxide and carbon dioxide).

For example, ethylene oxide or propylene oxide can be diluted with carbon dioxide to produce a bactericidal agent (for example,
No. 753).

In this case, when taking out the liquefied mixed fluid from the filling container through the siphon pipe, the concentration distribution is different between the top and bottom of the container, so the take-out pressure fluid concentration is different between the initial stage and the final stage of take-out. do.

Therefore, the pressure liquefied mixed fluid is removed from the bottom of the vessel via the siphon pipe.

At this time, as the liquefied mixed fluid in the container decreases, carbon dioxide gas evaporates into the space above the liquid level, so that the concentration of, for example, ethylene oxide increases rapidly.

In order to improve the above-mentioned drawbacks, the lower part of the large diameter pipe is bent, and the lower end of the bent pipe is
A siphon pipe is realized in which pipes that are sufficiently thinner and shorter than the large diameter pipe are connected and a fluid inlet is provided at a position above the stack from the lower end of the pipe, and a through hole is provided in the bent large diameter pipe. This is proposed in Publication No. 49-1068.

This proposed siphon tube can approximately equalize the concentration of the pressurized fluid and take it out, but the processing cost for attaching the thin tube to the large diameter tube increases, and the pressure liquefied mixed fluid cannot be taken out through the thin tube. In addition, because the fluid is filled into the container, there is a large fluid resistance and it takes time to take out and fill the container.Also, large diameter and small diameter pipes have a sudden change in cross-sectional area, so the space above the liquid level is When carbon dioxide gas is sucked into a large-diameter pipe through a through hole to dilute the fluid introduced from the suction port, carbon dioxide gas is sucked in first, making it impossible to obtain a uniform concentration. It has the following disadvantages.

This invention was devised for the purpose of providing an improved siphon tube that eliminates the drawbacks of the above-mentioned siphon tubes.

This invention will be explained below with reference to the drawings.

In FIG. 1, which is shown in cross section, 1 is a filling container, 2 is a valve, and a siphon pipe 4 is attached to the valve via a fitting 3 inside the container.

As shown in FIG. 2, the structure of the siphon tube 4 is such that the lower side of the straight tube 4a having the same diameter (e.g., brass tube, inner diameter 8 mm) is bent into the annular surrounding bottom 1a of the container 1. , its lower end is closed, for example by welding,
A fluid suction port 5 is provided at a position slightly above the closed end portion 4b,
Furthermore, the bent pipe 4a' has a structure in which a through hole 6 (for example, 1 mmφ) is bored at an appropriate position (for example, approximately + the height of the container), and the closed end of the lower end of this siphon pipe is connected to the annular enclosure. It is provided in contact with or slightly apart from the bottom 1a surface.

In this case, the position of the lower end of the siphon tube is determined in consideration of solid impurities (for example, rust) present in the recessed part.

The size of the suction port 5 determines the cross-sectional area in consideration of fluid resistance.

The shape of the suction port may be circular or round, and the number of suction ports may be one to several.

The point is that it is determined based on a predetermined cross-sectional area. The siphon tube of this invention consists of tubes with the same diameter, and the lower end of the tube body is closed, and the mixed fluid suction port is perforated at a position slightly above the closed end. When filling a container with pressure liquefied fluid, it can be filled in a short time because the fluid resistance is small.

For example, the time required to fill a 40.21 volume container with 30 kg of mixed fluid was 1.2 minutes.

However, the total length of the siphon tube is 115.2 cm (inner diameter 8 mm).
), the suction port is approximately 8 mmφ, and the filling pressure is 50 kg/cm2.
Met.

On the other hand, in the conventional siphon tube mentioned above, a 27 cm tube with an inner diameter of 4 mm is connected to the lower part to make the tube length 115 cm.
．． The required filling time for the 2 cm tube was 2.0 minutes.

In addition, in order to show the change in the cross-sectional area of the conventional siphon tube, which naturally narrows rapidly between the large-diameter tube and the thin tube when taking out the mixed fluid, it is shown in Figure 4 of the attached figure of Japanese Utility Model Publication No. 49-1068. As, molarity of ethylene oxide (%)
is the amount (12.5kg) relative to the amount remaining in the container (kg)
It is thought that the concentration changes according to the waveform curve from .

According to the siphon tube of this invention, as shown by the solid line II in the attached Figure 3, the ethylene oxide concentration (molar concentration %) relative to the amount remaining in the container (kg) is higher than that of the siphon tube shown in the above publication. The concentration changes following a gentle concentration curve.

Therefore, the concentration of ethylene oxide is significantly homogenized.

In the above experiment, the inner diameter was 8 mm, the tube length was 115.2 crn, the suction port was approximately 8 mmφ, and the tube was placed 1 mm at a position 30 cm above the end of the tube.
The test was carried out using a siphon tube with one through hole of φ having a molar concentration of ethylene oxide of 20%.

Curve I in the figure is an experimental curve for a straight siphon tube without a through hole in the siphon tube, and curve III in the figure is an experimental curve for a straight siphon tube with an inner diameter of 8 mm and a tube length of 8.82 cm.
Connect a thin tube with a length of 27 cm, close the tip of the thin tube, make a suction port (about 4 mmφ), and make a through hole (about 4 mmφ) in the large diameter tube.
This curve is an experiment using a siphon tube with a diameter of 1 mmφ), and the difference from this idea is that a large diameter tube and a thin tube were used.

As mentioned above, the siphon tube of this invention reduces the fluid resistance, so it can shorten the time for filling and taking out the liquefied mixed fluid of components with different boiling points into the container, and moreover, the concentration of the taken out components can be reduced. Changes over time are slight and uniform density can be achieved.

Furthermore, since it can be made using straight pipes of the same diameter,
It brings advantages such as being inexpensive.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional view showing an embodiment example, FIG. 2 is a side cross-sectional view showing the siphon tube of the present invention, and FIG. 3 is a diagram showing experimental results of the present invention. It is a graph showing an example. DESCRIPTION OF SYMBOLS 1...Filling container, 1a...Annular surrounding bottom of the container, 2...Valve, 3...Siphon pipe fitting, 4... Siphon tube, 4a...
...Straight pipe, 4b...Closed end, 5...
... Suction port, 6... Through hole.

Claims (1)

[Scope of utility model registration request] Filling container 1 filled with liquefied mixed fluid of components with different boiling points
In the siphon pipe 4 for pressure fluid extraction provided in the valve 2 which is screwed into the mouthpiece of the valve 2, the lower part of the straight pipe 4a constituting the siphon pipe is exposed to the annular surrounding bottom part 1a of the filling container 1. The lower end of the straight tube is closed, a fluid suction port 5 is provided above the closed end 4b, and a through hole 6 is provided in the bent straight tube to extract pressure fluid. siphon tube.