JPH11190497A - Liquefied gas cylinder and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquefied gas cylinder to uniformly fill the cylinder body with an adsorbing substance with no gap without needing high-cost equipment and prevent outflow of liquefied gas though a cost is very low. SOLUTION: After soft polyurethane foam 14 having a volume equivalent to the content volume of a cylinder body 1 is inserted in a soft film bag, the interior of the film bag is forced into a vacuum state by a vacuum pump. This way contracts the soft polyurethane foam 14 to diameter lower than that of the outlet hole 2 of the cylinder body 1 and inserts the foam in the cylinder body 1. Thereafter, a hole communicating with the outside air is formed in the soft film bag and by releasing the bag from a vacuum state, the soft polyurethane foam 14 is expanded and restored to fill the inner whole of the cylinder body uniformly with no gap. Liquefied gas is adsorptively held in the soft polyurethane foam 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used by being attached to a heating device such as a burner torch used for performing various heating operations using a combustible liquefied gas as fuel, for example, in a piping operation or a sheet metal operation. The present invention relates to a liquefied gas cylinder and a method for producing the same, and more particularly, to a liquefied gas cylinder having an adsorbent for adsorbing and holding a liquefied gas in a cylinder body and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as this kind of liquefied gas cylinder,
As disclosed in Japanese Utility Model Laid-Open Publication No. 59-133897, an adsorbent made of cotton-like pulp or the like capable of adsorbing a liquefied gas is inserted into a gas cylinder main body, and the filled liquefied gas is supplied to the cylinder main body. A filter that covers the outlet hole is provided on the inner surface of the cylinder body so that the liquid does not exist as a liquid that can flow out from the outlet hole, and the adsorbent and dust contained in the adsorbent are not ejected from the outlet hole together with gas. As disclosed in Japanese Unexamined Utility Model Publication No. Sho 63-128397, a gas cylinder body contains a polyol as a main component, a catalyst such as an amine compound, a foaming agent such as freon, and a foaming agent such as silicone oil. A liquid containing a flame retardant such as an agent and water, and a B liquid composed of polyisocyanate are mixed at a predetermined ratio, stirred, and injected to foam and resin in the cylinder body. Which is reacted by forming a suction body made of polyurethane foam, it has been proposed.

[0003]

Among the conventional liquefied gas cylinders having the above-described structure, in the former one, the operation of charging the adsorbent made of cotton-like pulp or the like into the cylinder body must rely on manual work. Not only, there is a problem in productivity, but also because it is difficult to fill the adsorbent uniformly,
A gap may be formed inside the adsorbent, or the adsorbent may contract in volume due to vibrations during transportation to create a large gap in the cylinder body, resulting in a decrease in the liquefied gas adsorption performance. There is a possibility that a product defect such as the presence of a liquid that easily flows out from the outlet hole of the product may occur.
Further, when the cotton-like pulp is used as the adsorbent, there is a problem that the working environment is such that the cotton-like pulp is scattered in the air together with the gas, so that it is indispensable for the worker to wear a dust mask. .

On the other hand, in the case of the latter, since the adsorbent is formed by foaming and resinification in the cylinder body, the charging and filling operation of the adsorbent can be mechanized, and the production of the adsorbent is made in comparison with the former. Although it is possible to improve the workability, it is also possible to improve the working environment, but because expensive foaming equipment is required, the effect of reducing the product cost is insufficient,
In addition, the polyurethane foam to be foamed is liable to be displaced in lots, and the filling ratio in each part in the cylinder body is different, so that a gap is generated, so that the liquefied gas is reliably prevented from flowing out in a liquid state. I couldn't get it.

[0005] The present invention has been made in view of the above-mentioned circumstances, and it is possible to fill an adsorbent uniformly and without gaps in a cylinder main body with high productivity without requiring expensive equipment, thereby achieving very low cost. However, an object of the present invention is to provide a high-performance liquefied gas cylinder free of liquefied gas outflow and a method for producing the same.

[0006]

In order to achieve the above object, a liquefied gas cylinder according to the first aspect of the present invention is provided in a cylinder body in which the size of an outlet hole is smaller than the size of other portions. A soft urethane foam having a volume equal to the inner volume of the cylinder body and capable of adsorbing liquefied gas is shrunk to a size smaller than the size of the outlet hole and inserted, and the inserted soft urethane foam is inserted into the cylinder body. The method for producing a liquefied gas cylinder according to the invention according to claim 2, characterized in that the entire interior is filled without gaps, and the liquefied gas is adsorbed and held on the soft urethane foam. One end is sealed with a soft urethane foam that has a volume equivalent to the internal volume of the cylinder body whose hole size is smaller than the size of the other parts and that can adsorb liquefied gas. After being inserted into the flexible film bag, the inside of the flexible bag is evacuated by the suction of a vacuum pump connected to the opening of the flexible film bag, and the flexible urethane foam is smaller than the size of the outlet hole of the cylinder body. After being shrunk to the size, the opening of the flexible film bag is sealed, and then the shrinkable flexible urethane foam is inserted into the cylinder body while being packed in the flexible film bag. By opening a hole through which the vacuum is released, the soft urethane foam is expanded and restored, and the entire inside of the cylinder body is filled without gaps. The outlet hole of the cylinder body is sealed.

According to the first and second aspects of the present invention, the adsorbent made of a soft urethane foam having a volume equivalent to the inner volume of the cylinder body is temporarily discharged from the cylinder body. By shrinking the flexible urethane foam to a size smaller than the size of the hole, it is possible to easily insert it into the cylinder main body. It is possible to prevent the liquefied gas from flowing out in the form of a liquid by preventing the space from being generated not only between the inside of the flexible urethane foam but also with the cylinder body. .

In particular, the soft urethane foam is inserted into a flexible film bag, and the inside of the flexible film bag is evacuated by the suction of a vacuum pump to put the flexible urethane foam into a cylinder body. When the means for shrinking to a size smaller than the size of the outlet hole is adopted, the equipment can be very simple, and the product ( Liquefied gas cylinder) Cost can be significantly reduced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a liquefied gas cylinder according to the present invention. In the figure, reference numeral 1 denotes a bottomed cylindrical cylinder body for containing a flammable liquefied gas, and the upper end of the cylinder body 1 has a lower side. An outlet hole 2 narrowed to a diameter d smaller than the diameter D of the portion is formed. Numeral 3 is a cylindrical connecting portion integrally formed on a lid 4 which is fixed by caulking to the upper end portion of the cylinder main body 1 so as to seal the outlet hole 2 of the cylinder main body 1, and a female screw portion 5 is formed on the inner peripheral surface thereof. Have been. Reference numeral 6 denotes a funnel-shaped vaporized gas receiving member, which is screwed to the female screw portion 5 and attached to an upper portion in the cylinder body 1. A rubber gasket 7 is fitted into an upper end opening of the vaporized gas receiving member 6 and a cylinder main body 1 is attached to a lower end thereof.
A pipe 9 that extends downward and that introduces vaporized gas into the internal space 6a of the receiving member 6 is joined.

A lower end 8a of the rubber packing 7 fitted to the upper end opening of the vaporized gas receiving member 6 is closed, and a cylindrical shaft 8 having a gas spray discharge section 10 at the upper end is provided with a cylinder. The main body 1 is inserted and held slidably in the axial direction. A knob 11 is inserted and fixed to the upper end of the cylindrical shaft 8, and between the closed lower end 8 a of the cylindrical shaft 8 and the bottom of the vaporized gas receiving member 6, an upper and lower middle part of the cylindrical shaft 8 is provided. The hole 12 formed is usually the rubber packing 7.
An elastic spring 13 for urging the cylinder shaft 8 upward so as to be positioned in the middle of the wall thickness is interposed.

A flexible polyurethane foam 14 having a volume equal to the inner volume of the cylinder body 1 and capable of adsorbing a liquefied gas is filled uniformly and without gaps in the cylinder body 1. A flammable liquefied gas is adsorbed and held in a vaporized state and filled in the cylinder body 1. The flexible polyurethane foam 14 serving as an adsorbent is usually a compound having an active hydrogen atom such as a polyisocyanate and a hydroxyl group, for example, a polyol, a foam stabilizer, a catalyst, and an antioxidant, a flame retardant, a pigment used for the purpose. Is obtained by adding a foaming agent to a polyurethane-forming system in which a raw material containing is blended, and foaming the polymer together with the formation of a polymer by a polymerization reaction.

In the liquefied gas cylinder having the above-described structure, a part of the liquefied gas is usually introduced into the internal space 6a of the vaporized gas receiving member 6 through the pipe 9 in a vaporized state. In this state, the knob 11 is pressed against the elastic biasing force of the spring 13 to move the cylindrical shaft 8 downward in the axial direction of the cylinder body 1 so that the hole 12 is formed in the internal space 6 of the vaporized gas receiving member 6.
When it is located at a, the vaporized gas under pressure is injected to the outside from the gas spray discharge section 10 at the upper end through the hole 10 and the internal passage of the cylindrical shaft 8.

Next, a method of manufacturing the above-described liquefied gas cylinder will be described in a list form. (1) As shown in FIG. 2, a cylindrical flexible polyurethane foam 14 having a volume equal to the inner volume of the cylinder body 1
Prepare to cut out. Here, the apparent density of the flexible polyurethane foam 14 is preferably 14 to 50 kg / m ³ . (2) The prepared flexible polyurethane foam 14 was
As shown in FIG. 1, after one end is inserted into a flexible film bag 15 made of polyethylene or the like, the suction port 1 of the vacuum pump 16 is inserted into the opening 15a of the flexible film bag 15.
7 is inserted and connected, and the vacuum pump 16 is operated to evacuate the inside of the flexible film bag 15 so that the flexible polyurethane foam 14 is connected to the outlet hole 2 of the cylinder body 1 as shown in FIG. Shrink to a diameter d1 equal to or slightly smaller than the diameter d. (3) A heat sealing portion 18 is applied to the opening 15a of the flexible film bag 15 for packaging the reduced flexible polyurethane foam 14, and the flexible film bag 15 is sealed as shown in FIG.

(4) Next, after the shrinkable flexible polyurethane foam 14 is packed in the flexible film bag 15 and inserted into the cylinder body 1 using the hopper-shaped insertion guide 19 as shown in FIG. (5) By opening a hole communicating with the outside air in the film bag 15 by cutting the lower side of the heat sealing portion 18 at the opening 15a of the flexible film bag 15 and releasing the vacuum state, FIG. As shown in (2), the flexible polyurethane foam 14 is expanded and restored, so that the flexible polyurethane foam 14 is uniformly and completely filled in the entire cylinder body 1. (6) Thereafter, by injecting a predetermined amount of flammable liquefied gas into the cylinder body 1, the liquefied gas is impregnated into the flexible polyurethane foam 14 to be adsorbed and held, and the outlet hole 2 of the cylinder body 1 Lid 4 with cylindrical connecting part 3
By caulking and fixing, and by assembling the vaporized gas receiving member 6 with the connecting portion 3,
A liquefied gas cylinder as shown in FIG. 1 is completed.

The liquefied gas cylinder manufactured by the above-described method is very simple in terms of equipment only by using the vacuum pump 16 and the hopper-shaped insertion guide 19, but it is installed in the cylinder body 1 in a simple manner. It is possible to fill the flexible polyurethane foam 14 having a volume equivalent to the internal volume uniformly and without gaps, and to adsorb and hold the flammable liquefied gas evenly, thereby,
It is possible to obtain a liquefied gas cylinder that reliably prevents the combustible liquefied gas from becoming liquid and flowing out.

In the above embodiment, the flexible polyurethane foam 14 serving as an adsorbent is cut into a cylindrical shape, but may be cut into a rectangular column or molded.

[0017]

As described above, according to the first and second aspects of the present invention, the adsorbent made of a soft urethane foam having a volume equivalent to the inner volume of the cylinder body is temporarily removed.
The flexible urethane foam is shrunk to a size smaller than the size of the outlet hole of the cylinder body, inserted into the cylinder body, and the inserted soft urethane foam is expanded and restored, so that the soft urethane foam is uniformly and without gaps throughout the cylinder body. A high-performance liquefied gas cylinder that can be filled to prevent the generation of space between the inside of the soft urethane foam and the cylinder itself, so that the liquefied gas can be reliably prevented from becoming liquid and flowing out. Obtainable.

In particular, according to the second aspect of the present invention, the inside of the flexible film bag for packaging the flexible urethane foam is evacuated by the suction of a vacuum pump to make the flexible urethane foam smaller than the size of the outlet hole of the cylinder body. By adopting the means for shrinking to a small size, it is possible to reduce the cost of the product (liquefied gas cylinder) while improving productivity by mechanizing the filling work of the adsorbent while using very simple equipment. As described above, it is possible to reliably and easily manufacture a high-performance liquefied gas cylinder free of liquefied gas while achieving a remarkable reduction.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a liquefied gas cylinder according to the present invention.

FIG. 2 is a longitudinal sectional view of a flexible polyurethane foam used in the method for producing a liquefied gas cylinder according to the first embodiment.

FIG. 3 is a longitudinal sectional view illustrating a first step of the manufacturing method.

FIG. 4 is a longitudinal sectional view illustrating a second step of the manufacturing method.

FIG. 5 is a longitudinal sectional view illustrating a third step of the manufacturing method.

FIG. 6 is a longitudinal sectional view illustrating a fourth step of the manufacturing method.

[Explanation of symbols]

 Reference Signs List 1 cylinder body 2 outlet hole 14 flexible polyurethane foam (adsorbent) 15 flexible film bag 15a opening 16 vacuum pump

Claims (2)

[Claims] 1. A soft urethane foam having a volume equal to the inner volume of the cylinder body and capable of adsorbing a liquefied gas is provided in the cylinder body having an outlet hole smaller in size than other portions. Shrink to a size smaller than the size of the container, insert the inserted soft urethane foam into the entire cylinder body without gaps, and adsorb and hold the liquefied gas on the soft urethane foam. Characterized liquefied gas cylinder. 2. A soft urethane foam which has a volume equivalent to the inner volume of a cylinder body having a smaller outlet hole size than other portions and has a sealed end on one end made of a soft urethane foam capable of adsorbing liquefied gas. After being inserted into the film bag, the inside of the film bag is evacuated by the suction of a vacuum pump connected to the opening of the soft film bag, and the soft urethane foam is smaller than the size of the outlet hole of the cylinder body. After shrinking, the opening of the flexible film bag is sealed, and then the shrinkable flexible urethane foam is inserted into the cylinder body while being packed in the flexible film bag. By releasing a vacuum by opening a hole, the flexible urethane foam expands and restores and fills the entire cylinder body without any gaps. The liquefied gas quantification is sucked and held on the flexible urethane foam, and method for producing a liquefied gas cylinder, characterized by sealing the outlet hole of the cylinder body.