JPS6040454Y2 - Gas venting structure of piston type pressure vessel - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a so-called piston-type pressure vessel in which a piston is raised by gas pressure to discharge the contents.

Conventionally, as this type of pressure vessel, there is one shown in FIG.

In this structure, a piston 2 is slidably inserted into an inner chamber A of a cylindrical main body 1, and the open lower end is hermetically closed by a bottom wall 3, and the inner chamber A is partitioned by the piston 2.
The upper chamber is filled with contents 8, and the lower chamber A is filled with high-pressure gas 7.

The contents 8 and the gas 7 are filled before the bottom wall 3 is attached.

In the pressure vessel, when the valve 6 provided at the upper end of the main body 1 is pushed to open it, the piston 2 is raised by the gas pressure in the lower chamber A1, and the contents 8 are discharged from the discharge port of the valve.

When the contents 8 are used up, the piston 2 moves to the upper end of the main body 1, but the gas 7 remains in the lower chamber A1.

If it is disposed of as is, there is a risk of explosion, etc. In the conventional model described above, a through hole 4 is provided in the bottom wall 3 and this is tightly plugged with a plug 5. The gas 7 is released by opening the cap.

However, in this case, not only is the cost of sealing the container not negligible for this type of pressure vessel, but it is also troublesome to open the cap when it is used.

The object of the present invention is to communicate the upper and lower chambers at the highest piston position so that degassing after use of the cylinder can be performed only by operating the discharge valve.

The basic structure of the present invention is that a concave portion or a convex portion of an appropriate size is provided on the inner chamber side wall in a portion corresponding to the sliding foot of the piston at its highest position.

With the above-described configuration of the present invention, degassing work after using the cylinder can be performed only by operating the discharge valve.

That is, since the upper chamber and lower chamber communicate with each other at the piston's highest position, the gas filled in the lower chamber is guided to the discharge valve, and degassing can be performed by opening the valve. be.

Moreover, since the present invention has the above configuration, it has the following unique effects.

(1) Since there is no need for a plug on the bottom wall, it is possible to prevent gas leakage due to poor airtightness in this part.

(2) Since only a recess or a convex portion is formed on the side wall of the main body as a configuration for gas venting, there is no need to process a through hole for gas venting or a plug to seal the through hole, making it possible to manufacture it at low cost. .

Next, an embodiment of the present invention described above will be described based on the drawings.

FIG. 2 shows the structure of a pressure vessel according to an embodiment of the present invention.

The main body 1 is formed by deep drawing. The upper side wall of the inner chamber A formed by the inner circumferential wall of the main body 1 is provided with recesses 19, 19 at the portions where the sliding feet 21 of the piston 2 are located when the piston 2 is raised to the highest level (see Fig. 3). .

Therefore, as will be described later, these recesses 19.degree. 19 become communication passages connecting the lower chamber and the upper chamber when the piston is at its highest position.

After a main body 1 equipped with a discharge valve 6 is inverted and filled with contents 8 such as toothpaste, hair styling products, etc., a piston 2 to be described later is inserted leaving the open part behind.

Thereafter, high-pressure gas 7 is filled and the open part of the main body 1 is sealed by the bottom wall 3, thereby completing the piston-type pressure vessel according to the embodiment of the present invention.

To explain the structure of the piston 2 described above, the piston 2 is formed of synthetic resin in the shape of an inverted deep dish, its upper bottom part 23 is made to match the shape of the shoulder part 18 of the main body 1, and its body part 22 is formed in the inner chamber A. It is set appropriately smaller than the inner diameter of.

A sliding foot 21 is provided around the open lower end of the piston 2, and its outer diameter is slightly larger than the inside diameter of the inner chamber A.

Furthermore, a groove 24 is provided around the upper bottom 23 so that when the piston 2 rises and the upper bottom 23 comes into contact with the shoulder 18, the gas 7 passes through the groove 24 to the valve 6. That's how it works out.

Now, to explain the actual use of the pressure vessel of the embodiment of the present invention described above, when the valve 6 is pressed down to release the sealed state of the contents, the piston 2 rises due to the same action as explained in the conventional example. The contents 8 are discharged.

When all the contents have been discharged and the piston 2 has reached the vicinity of the highest position, as shown in FIG.
reaches the position corresponding to the recesses 19,19.

At this time, a gap is created between the sliding foot 21 and the recesses 19, 19, forming a communication path connecting the lower chamber A1 and the upper chamber A2.

Therefore, the gas 7 passes through the communication path and is ejected from the valve 6.

In addition, in the case of the above embodiment, the upper bottom part 23 of the piston 2
Since the groove 24 is provided in the groove 24, the gas 7 has the advantage of being completely discharged through the groove 24 even when the upper base 23 is in contact with the shoulder 18 of the main body 1.

Furthermore, even if a protrusion is provided instead of the recess 19, when the piston 2 reaches the vicinity of the highest position, the slide foot 21 rides on the protrusion and is deformed, causing the protrusion and the slide foot 21 to come into contact. Since gaps are formed between the sections, the same effect as above is obtained.

Although the above embodiments have been described with respect to a pressure vessel with a single piston, it goes without saying that the present invention can also be applied to a pressure vessel with a double piston.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional example, and FIGS. 2 and 3 are partially cutaway sectional views of an embodiment of the present invention. 7...gas, 8...
... Contents, A1 ... Lower chamber, A2 ...
...Suprachamber, 21...Slip foot.

Claims (1)

[Scope of utility model registration request] The piston 2 is slidably inserted into the inner chamber A of the main body 1, and the contents 8 are inserted into the upper chamber divided into upper and lower sections by the piston.
In a piston-type pressure vessel in which the lower chamber A0 is filled with high-pressure gas 7, a recess or a convex portion is provided on the upper side wall of the inner chamber A, and when the piston 2 is at its highest position, its sliding foot 21 moves into these recesses or convex portions. Gas venting structure of a piston type pressure vessel that matches the convex part.