JPH05346200A - Method for manufacturing gas cylinder - Google Patents

Abstract

PURPOSE:To provide a gas cylinder manufacturing method by which filling work of an adsorbent can be mecanized and further provision of any additional filter is not required and production can be achieved through less manufacuring process. CONSTITUTION:A method is provided for manufacuring a gas cylinder 2 having an adsorbent 3 impregnated with combustible liquid gas inside a cylinder main body 2. The adsorbent 3 is formed through process of foaming and conversion to resin inside the main body of the gas cylinder. Thereafter the combustible liquified gas is impregnated in the adsorbent 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a gas cylinder, more specifically, a gas cylinder attached to a heating device such as a torch lamp used for piping work, sheet metal work, heat treatment of small articles, etc. The present invention relates to a method for producing an adsorbent, which is soaked with liquefied gas, in a cylinder body.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a gas cylinder of this type, there is an invention described in, for example, Japanese Utility Model Laid-Open No. 59-133897.

In this conventional gas cylinder manufacturing method, as shown in FIG. 5, an adsorbent 38 made of cotton-like pulp or the like for adsorbing flammable liquefied gas is loaded into the cylinder body 32, and the adsorbent is Liquid gas is soaked in 38.

In the gas cylinder manufactured by the above manufacturing method, a filter 39 is provided on the inner surface of the cylinder body 32 below the gas passage hole 35, and the valve body of the burner is screwed to the cylinder body 32 to make the gas passage hole 35. When the inside of the cylinder body 32 and the cylinder body 32 are communicated with each other through the gas outlet hole, the adsorbent 38 or dust contained in the adsorbent 38 is configured not to be ejected from the gas flow passage hole 35 to the burner portion side together with the gas. Thus, the liquefied gas in a liquid state is prevented from flowing out to the burner part attached to the outlet part of the cylinder body 32, and the fire is not extinguished or the flame is not extremely enlarged, so that it can be used safely.

[0005]

However, the work of loading the adsorbent 38 made of cotton-like pulp or the like into the cylinder body 32 must be done manually, and it is difficult to improve the productivity. In addition, it is difficult to uniformly fill the adsorbent 38, and a gap is likely to be formed inside the adsorbent 38, which may result in a decrease in the adsorption performance of the liquefied gas. Also,
The adsorbent 38 condenses due to vibration during transportation and the cylinder body 3
2 There was a possibility that a large gap was created inside the product, which could lead to product defects. Further, when the cotton-like pulp is used as the adsorbent 38, the cotton-like pulp is scattered in the air, so that the working environment is bad and a mask is indispensable for the worker.

The present invention has been made in view of the above-mentioned problems, and it is possible to mechanize the work of filling the adsorbent, and further, it is not necessary to separately provide a filter, and the manufacturing process can be performed with fewer manufacturing steps than the conventional one. An object of the present invention is to provide a method for manufacturing a gas cylinder.

[0007]

Therefore, the method for producing a gas cylinder according to the present invention is a method for producing a gas cylinder, wherein an adsorbent impregnated with a combustible liquefied gas is provided in the cylinder body. It is characterized in that the adsorbent is formed by solidification and resinification, and the flammable liquefied gas is impregnated into the adsorbent.

[0008]

According to the gas cylinder of the present invention, the adsorbent is foamed and made into resin in the cylinder body to form the adsorbent, so that the manual adsorbent loading operation is unnecessary and mechanization is possible. In addition, it is possible to perform the manufacturing process with fewer manufacturing steps than the conventional one without providing a separate filter, so that it is possible to improve the production efficiency and reduce the cost. Then, the adsorbent does not scatter in the air and the working environment is improved. Further, since the foamed and resinified adsorbent is attached to the inner wall of the cylinder body, there is no gap due to vibration during transportation, and no trouble such as product defect occurs.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway front view of a gas cylinder 1 manufactured by the method for manufacturing a gas cylinder according to the first embodiment.

Hereinafter, the structure of the gas cylinder 1 will be described, and then the manufacturing method and usage mode thereof will be described.

In FIG. 1, reference numeral 2 is a cartridge-shaped liquefied gas cylinder body, and a bottom plate 7 is caulked and fixed to the lower portion of the cylinder body 2. A cap 3 is fixed to the upper portion of the cylinder body 2 by caulking the periphery thereof to the upper end of the cylinder body 2. At the center of the cap 3, a connecting portion 3a, which is formed by cutting a male screw for screwing the valve body 10 on the outer periphery, is projected, and a bottomed hole 5 for a gas passage is provided at the center of the connecting portion 3a. The bottom of the gas passage hole 5 has a thin plate thickness. On the outer side of the connecting portion 3a, a cylindrical outer receiving portion 3b surrounding the connecting portion 3a is provided so as to be spaced from the connecting portion 3a. The cylinder body 2 is filled with an adsorbent 8 made of polyurethane foam or the like that is foamed and resinified in the body 2, and the adsorbent 8 is sufficiently impregnated with liquefied gas. In this way, the cylinder body 2 is filled with the liquefied gas impregnated in the adsorbent 8 made of polyurethane foam or the like.

In order to manufacture the gas cylinder 1 having such a structure, first, the cylinder body 2 without the cap 3 is attached.
Hold. Then, a solution A containing a polyol as a main component and containing a catalyst such as an amine compound, a foaming agent such as freon, a foam stabilizer such as silicone oil, a flame retardant such as water, and a solution B comprising polyisocyanate are 2: 1. The solution mixed at the ratio is stirred and poured into the cylinder body 2. Then, the foaming reaction and the resinification reaction are simultaneously performed in the cylinder body 2 to form the polyurethane foam as the adsorbent 8.

As shown in FIG. 2, the polyurethane foam 8 is formed so as to slightly protrude from the cylinder body 2. For example, if the cylinder body has a capacity of 550 cm ³ ,
The density of the polyurethane foam formed by injecting 20 g of liquid and 10 g of liquid B into the cylinder body 2 is 0.05 g / cm ³
When the foam is expanded about 20 times, the cylinder body 2
Approximately 50 cm ³ of polyurethane foam sticks out. After that, the protruding portion is cut off. If the smooth skin surface is cut to expose the air bubble particles inside the polyurethane foam, the liquefied gas can be easily filled.

Next, after injecting a fixed amount of liquefied gas into the cylinder main body 2 to fill the adsorbent 8 with the gas, the periphery of the cap 3 is caulked to the upper end of the cylinder main body 2 to be sealed, and then the adsorption is performed. A gas cylinder 1 in which the body 8 is sufficiently impregnated with liquefied gas is obtained. In addition, after caulking the cap 3 to the cylinder body 2 in advance and sealing it, a solution obtained by mixing the liquids A and B is injected from the bottom plate 7 side to foam and resin, and then the bottom plate 7 is caulked to form. You can also

FIG. 3 is a usage diagram showing a state in which the valve body 10 of the burner 20 is assembled to the gas cylinder 1 of the first embodiment. The valve body 10 is provided with a cylindrical connecting portion 12 that can be screwed into the connecting portion 3a of the cap 3 of the cylinder body 2 on the valve shaft 11, and an internal thread is cut on the inner circumference of the connecting portion 12. Has been done. After screwing this female screw onto the male screw formed on the outer periphery of the cap 3 of the cylinder body 2,
The valve body 10 is firmly and integrally fixed to the cylinder body 2 by tightening the lock nut 18 screwed onto the outer periphery of the connecting portion 12 until it comes into contact with the upper end surface of the outer receiving portion 3b.

A valve shaft 11 is fitted with a base portion 15 of a needle 14 having a triangular cross section for forming an outlet hole 4 for vaporized gas in the axial direction thereof. The needle 14 has a collar portion 16 provided at an intermediate portion thereof fitted into a concave portion formed on the end surface of the valve shaft 11 at the open end of the passage 13 and positioned in a predetermined state, and the base portion 15 and the collar portion 16 are not shown. The groove is formed continuously so that the vaporized gas in the cylinder body 2 can flow out to the passage 13 of the valve shaft 11. Further, the surface of the collar portion 16 is pushed by the packing 17 fitted in the escape portion of the screw on the inner circumference of the connecting portion 12,
The needle 14 is held on the end surface of the valve shaft 11 in a protruding manner.

When the valve body 10 is assembled to the cylinder body 2 as described above, the tip of the needle 14 passes through the gas flow path hole 5 of the cap 3, penetrates the cap 3 and projects toward the adsorbent 8 side, and the gas is discharged. An outlet hole 4 is formed. 9 is a packing for preventing gas leakage, and 19 is a knob for adjusting the flow rate of gas to a nozzle portion (not shown) in the valve body 10.

When the knob 19 is adjusted to open the gas passage to the nozzle portion (not shown) of the valve body 10, the inside of the cylinder body 2 is communicated with the outside air. The liquefied gas adsorbed on the adsorbent 8 is vaporized, and the vaporized gas ejected from the outlet hole 4 is
The needle 14 enters the passage 13 of the valve shaft 11 through a groove (not shown) formed in the flange portion 16 and the base portion 15 of the needle 14, and is ejected to the burner 20 through the nozzle portion and ignited and burned.

In this case, since the liquefied gas filled in the cylinder body 2 is soaked in the adsorbent 8, even if the valve body 10 is tilted or turned downward, the burner 2
Only vaporized gas will be delivered to 0, and there will be no phenomena such as extinguishing a fire, extremely large flame, or suddenly large flame. As a result, a stable heating temperature is always obtained, and there is no waste or inconvenience that the flame hits other than the target object.Therefore, the inclination of the torch lamp can be freely changed, so that the object to be processed is heated from various directions. It becomes possible and the workability is extremely good.

In the gas cylinder 1 produced according to the first embodiment described above, the urethane foam particles formed by foaming and resinification are dense and uniform. When the foaming and resinification reactions are mixed in proportion to accelerate the reaction, as shown in FIG. 4, the cylinder portion of the cylinder body 22 becomes uniform fine particles 28b, and the conical portion in the upper portion rises faster due to the change in area. Therefore, coarse particles can be obtained. The present invention achieves the object if the adsorbents 8 and 28 are formed by foaming and resinizing, and are not limited to the examples.

In the manufacturing method according to the second embodiment, for example,
The adsorbent 28b has a foaming rate of about 21 times,
The foaming rate of a can be increased to about 45 times. When the adsorbent 28a is roughly formed in this manner, the liquefied gas permeates quickly, so that the liquefied gas filling operation can be performed quickly, and the production efficiency can be further improved.

As a result of various experiments conducted by the inventor, the adsorbent 28a through which the liquefied gas to be filled first passes is 40 to 5
It is preferably formed with a foaming ratio of about 0 times. If the expansion ratio is 50 times or more, the adsorption power of the liquefied gas becomes too small, and there is a risk of leaking in a liquid state when the cylinder is inverted. Conversely, if the expansion ratio becomes 40 times or less, liquefaction occurs. Since the gas filling speed cannot be increased so much, the effect of improving the production efficiency is reduced.

When the entire adsorbent 8 is densely formed as in the first embodiment, a large amount of liquefied gas can be filled, although the liquefied gas needs to be filled in the cylinder body 2 having a constant volume for a long time. On the contrary, if the entire adsorbent 8 is roughly formed, the amount of liquefied gas that can be filled in the cylinder body having a constant volume is small, but the time required for filling is shortened. Therefore, the adsorbent 8, depending on the usage and purpose of the gas cylinder,
The density of 28 particles (expansion ratio) can be appropriately selected.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a gas cylinder manufactured by a method for manufacturing a gas cylinder according to a first embodiment.

FIG. 2 is a partially cutaway front view showing a state in which an adsorbent is foamed and made into a resin by the manufacturing method.

FIG. 3 is a partially cutaway front view showing a state where the valve body is assembled to the gas cylinder.

FIG. 4 is a sectional view of a gas cylinder manufactured by a manufacturing method according to a second embodiment.

FIG. 5 is a partially cutaway front view of a gas cylinder manufactured by a conventional manufacturing method.

[Explanation of symbols]

 1 ... Gas cylinder 2 ... Cylinder body 3 ... Adsorbent

Claims (1)

[Claims] 1. A method for manufacturing a gas cylinder, comprising an adsorbent impregnated with a flammable liquefied gas in a cylinder main body, wherein the adsorbent is formed by foaming and resinifying in the cylinder main body. A method of manufacturing a gas cylinder, wherein the flammable liquefied gas is impregnated with the gas.