JP3130513U - High pressure gas cartridge - Google Patents

Abstract

A high-pressure gas cartridge that does not cause corrosion of a sealing plate over a long period of time, particularly a small high-pressure gas cartridge having an internal volume of about 10 to 500 ml.
A high pressure gas cartridge is mounted on a container body with a sealing plate 3 selected from a tin-free steel plate or a nickel-plated steel plate. In this case, the sealing plate can have a thickness of 0.2 to 0.6 mm and a yield strength of 200 to 500 MPa.
[Selection] Figure 1

Description

  The present invention relates to a high-pressure gas cartridge, and more particularly to a small high-pressure gas cartridge having an internal volume of 500 ml or less.

  A high-pressure gas cartridge, particularly a small high-pressure gas cartridge having an internal volume of 500 ml or less, is used for various applications. For example, high-pressure gas cartridges filled with carbon dioxide gas are used for carbonated water production equipment, food extrusion equipment such as draft beer servers, life jackets, pressurized fire extinguishers, dust blowers for precision equipment such as computers and cameras, and water tanks. It is used as a carbon dioxide supply source for aquatic plants. In addition, the cartridge in which oxygen gas is sealed is used as an oxygen supply source for portable oxygen inhalers such as heart disease as well as a device for preventing toxic gas inhalation and an oxygen deficiency countermeasure device in the event of a fire. Such a high-pressure gas cartridge is required to maintain a normal gas pressure without causing a gas leak or the like over a long period of time due to its nature.

  In general, such a high-pressure gas cartridge is formed by pressing an ultra-deep-drawn cold-rolled steel sheet having a thickness of about 2 mm into a bottomed cylindrical body, and then softening the vicinity of the opening by induction heating to form the die part. Then, after threading as necessary, the lubricating oil is degreased, and the sealing plate is welded while carbon dioxide gas, nitrogen gas or the like is sealed in the obtained bottomed cylindrical body with the base part. Finally, the outer surface is manufactured by subjecting it to rust prevention treatment such as galvanization for rust prevention. The series of steps prevents corrosion of the main body and the sealing plate when the high-pressure gas cartridge is stored for a long period of time. These high-pressure gas cartridges generally have an internal volume of about 10 to 500 ml.

  However, even high-pressure gas cartridges that have normal gas pressure at the time of manufacture and shipment, and that do not leak gas, may gradually deteriorate in function due to gas leakage over time. In some cases, it may be difficult to ensure sufficient reliability. It is known that such gas leakage due to the passage of time is often caused by the progress of corrosion particularly in the sealing plate portion.

  For example, when a high-pressure gas cartridge built in a pressurized fire extinguisher is stored in a fire extinguisher for a long period of time, for example, in a home, the function is gradually deteriorated due to gas leakage over time. Some have pointed out that it may be difficult to ensure sufficient reliability for emergency use.

  As means for solving such a problem, Patent Document 1 discloses a fire extinguisher containing a pressurized gas for extinguishing a fire extinguishing agent, and when a gas in a container leaks into a part of the fire extinguisher. There has been proposed a pressurized fire extinguisher comprising means for displaying gas leakage by developing or changing color in contact with leakage gas.

  The means described in Patent Document 1 is expected to have a certain effect if proper management is performed. However, such means are based on the premise that there is gas leakage due to corrosion of the sealing plate during long-term storage, and are not a radical measure for preventing leakage. In particular, when a fire extinguisher is left uncontrolled, such as in a general home, the fire extinguishing capability is insufficient in an emergency due to gas leakage due to corrosion of the sealing plate described above. There is a risk of causing problems. Moreover, there is a possibility that the fire extinguishing liquid may leak from the fire extinguisher due to such gas leakage and contaminate a fire extinguisher storage place such as a floor or a carpet in the home.

  As a means for solving the above problems, it is conceivable to use a plated steel plate as the sealing plate material. However, for example, when a tin-plated steel sheet is used for the purpose of preventing corrosion of the sealing plate, when the sealing plate is resistance-welded to the bottomed cylindrical body with the base, the plating component tin is bonded to the metal copper and alloy of the welding electrode. In the case of a thin steel plate that is formed and not plated, it can be welded after polishing the electrode surface of 400 points or more, whereas if it is welded about 30 points, the electrode will not be separated from the tin plating plate, so the electrode must be polished. Don't be.

  This phenomenon is experienced during the manufacture of a welded can made by welding a can body of a beverage can. For example, a countermeasure as shown in Patent Document 2 is taken. That is, when welding tin-plated plates, a copper wire is inserted between the disc-shaped electrode and the tin-plated plate, and after welding, the body-lined body wire is discarded, and unalloyed fresh copper is always used. A line is inserted.

Japanese Patent Laid-Open No. 2000-202057 Japanese Patent Publication No.54-4684

  However, the means described in Patent Document 2 has a complicated process and a large equipment cost, and it is not economical to apply it to the joining of a sealing plate of a small cartridge. Therefore, the sealing plate of the above-mentioned small gas cartridge uses a so-called untreated cold-rolled steel plate that is not plated, and no drastic measures have been taken to improve the corrosion resistance of the sealing plate portion. Currently.

  An object of the present invention is to provide a high-pressure gas cartridge that does not cause corrosion of the sealing plate over a long period of time, particularly a small high-pressure gas cartridge having an internal volume of about 10 to 500 ml.

  The present inventor has tested various types of plated steel sheets as sealing plate materials, and tin-free steel plates and nickel-plated steel plates have compatibility with conventional sealing plate welding processes, and these were used as sealing plate materials. The inventors discovered that the high-pressure gas cartridge has excellent corrosion resistance and completed the present invention.

  The high-pressure gas cartridge of the present invention is formed by mounting a sealing plate selected from a tin-free steel plate and a nickel-plated steel plate on a steel container body. In the above device, the sealing plate preferably has a thickness of 0.2 to 0.6 mm and a yield strength of 200 to 500 MPa.

  The high-pressure gas cartridge manufactured according to the present invention does not cause corrosion of the sealing plate over a long period of time.

  Hereinafter, the present invention will be described by taking as an example a high-pressure gas cartridge for a fire extinguisher which is a typical application target thereof. As shown in FIG. 1, a high-pressure gas cartridge 11 according to the present invention comprises a main body, that is, a bottomed cylindrical portion 1, a mouth portion 2 formed by narrowing the head of the cylindrical body, and a mouth portion 2 of the main body. It consists of a sealing plate 3 that seals the opening. The mouth 2 is generally provided with a threaded portion 4 for fixing in a pressurized fire extinguisher. Further, the gas body is filled with a predetermined pressure in accordance with the use. In the case of a fire extinguisher, the type of gas body is generally carbon dioxide. The size is about 25 to 40 mm in diameter, about 110 to 140 mm in height (including the mouth), and about 30 to 100 ml in internal volume.

  The manufacturing process of the high-pressure gas cartridge 11 includes press molding of a material such as a steel plate into a bottomed cylindrical body, softening of the mouth by induction heating, threading performed as necessary, degreasing of lubricating oil, and gas for a fire extinguisher (nitrogen The high pressure gas such as liquefied gas such as liquefied carbon dioxide) and the sealing plate welding process are performed in this order.

  The molding into the bottomed cylindrical body is performed by press molding using press oil as usual. The obtained bottomed cylindrical body is subjected to mouth induction heating for softening the vicinity of the opening end in order to form a portion corresponding to the mouth portion of the high-pressure gas cartridge, and then the mouth tip processing is performed. The bottomed cylindrical mouth portion for the high-pressure gas cartridge formed in this way is subjected to threading as necessary, and then the oil used in the press molding and threading operation is simultaneously degreased on the inner and outer surfaces, Dried. Subsequently, a fire extinguisher gas, for example, liquefied carbon dioxide gas, is filled from the opening of the bottomed cylindrical body thus formed and threaded, and at the same time, the sealing plate is sealed by resistance welding.

  In the present invention, the gas for the fire extinguisher is filled from the opening of the bottomed cylindrical body that has been molded, degreased and dried as described above, and at the same time, the sealing plate is sealed by resistance welding. In sealing, in order to prevent the sealing plate from shifting from the position where the sealing plate should be sealed from the opening of the container body, a score 11 is put in the separation part in advance as shown in FIG. The sealing plate material 10 is placed on the mouth 2 of the front end of the main body, and then the bottom 13 and the tip of the mouth 2 are welded, for example, by resistance welding, and then the surrounding ring-shaped part 14 is cut off. .

  The sealing plate material is required to have a formability capable of performing the above processing and a good resistance weldability. Moreover, it is requested | required that it should have sufficient corrosion resistance in the state built in the fire extinguisher for a long period of time. Moreover, when it is used as a built-in pressure source of a fire extinguisher, for example, it is required to have breakability easily by a handle operation.

First, in order to satisfy the corrosion resistance, a tin-free steel plate or a nickel-plated steel plate is selected. These plated steel sheets have sufficient characteristics to prevent the sealing plate from corroding due to the generated carbon dioxide, etc., even if moisture that causes corrosion of the sealing plate in the long-term use process of the high-pressure gas cartridge remains inside the container. In addition to ordinary tin-free steel, tin-free steel called non-abrasive welded steel sheet in which the thickness of chromium hydrated oxide is reduced can also be used. Tin-free steel includes thin nickel-plated steel sheets having a basis weight of 2 g / m ² or less in addition to chromium hydrated oxide tin-free steel sheets. There are two types of nickel-plated steel sheets, one manufactured by electroplating after applying recrystallization annealing to a thin steel sheet, and one manufactured by recrystallization annealing after electroplating a thin steel sheet. However, any of them has a high melting point of the plating layer and can be used for the purpose of the present invention without affecting the life of the electrode used for welding. In addition, as a weldable metal plating having a rust prevention function, galvanization can be mentioned, but it is the same as tin plating that has an adverse effect of increasing the frequency of electrode polishing by forming an alloy with copper of the electrode, It is not suitable as a sealing plate of the present invention.

  In order to combine the fracture pressure required for the sealing plate and the ease of breaking by the handle operation of the fire extinguisher, the yield strength of the sealing plate material is 200 to 500 MPa, preferably 250 to 430 MPa, and the thickness is 0.20 to 0.20. It is good to set it as 0.60 mm. When the yield strength is less than 200 MPa, the press formability and the fracture pressure are insufficient in the above thickness range, and when it exceeds 500 MPa, the press formability and the ease of breakage due to handle operation become insufficient. In addition, if the thickness of the sealing plate is too thin, it may be difficult to provide a fracture resistance even if the yield strength is increased, and if it is too thick, it may be difficult to break. Furthermore, it is determined in consideration of production and management stability when welding the sealing plate.

  Of those commercially available steel plates for cans, steel plates having a hardness of T2 to T5 are suitable. In particular, T3CA and T4CA, or an intermediate product thereof is preferable. The T3CA is a steel plate for cans classified into 7 stages from T1 of 49 ± 3 to T6 of 70 ± 3 according to Rockwell hardness. The hardness corresponds to T3, and the hardness is finally obtained by continuous annealing. It is adjusted. The same applies to T4CA.

  As described above, the present invention has been described when applied to a high-pressure gas cartridge of a fire extinguisher. However, the high-pressure gas cartridge according to the present invention is incorporated into a drinking water container and used as an internal high-pressure gas cartridge for extrusion. it can.

It is a conceptual diagram which shows the structure of the high pressure gas cartridge which concerns on this invention. It is explanatory drawing which shows the attachment point of a sealing board.

Explanation of symbols

1: Bottomed cylindrical part
2: Mouth
3: Seal plate
4: Threaded part
10: Seal plate material
11: Score
13: Bottom
14: Ring-shaped part

Claims (2)

  A high-pressure gas cartridge comprising a steel container body and a sealing plate selected from a tin-free steel plate and a nickel-plated steel plate.   The high-pressure gas cartridge according to claim 1, wherein the sealing plate has a thickness of 0.2 to 0.6 mm and a yield strength of 200 to 500 MPa.

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