JPH0754131Y2 - Gas container anti-rust stopper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a rust preventive plug that can be used in various gas containers.

(Prior Art) A gas container filled with a high-pressure gas is usually manufactured from a steel billet by the Mannesmann method, and the inner surface is subjected to surface treatment such as shot blasting followed by blowing dry air. Therefore, the problem does not occur if the gas is filled immediately after the production, but there is a problem that rust occurs even if it is left for about half a day. Therefore, in order to prevent rusting, a hygroscopic agent such as silica gel has been conventionally added.

However, debris and powder of the hygroscopic agent may adhere and remain on the inner surface of the container, and it is difficult to remove this by 100%. Therefore, there is a problem that impurities are mixed in the gas.

(Technical Problem) An object of the present invention is to keep the inside of the gas container in a dry state to prevent rusting and to store the gas container without mixing impurities.

(Technical Means) In order to solve the above problems, the present invention is loosely inserted into a filling port 2 and disposed therein, and a large number of small holes 4 are formed in the lower part to allow moisture in the gas container 1 to pass therethrough. Further, it has a hollow cylindrical lower plug portion 5 having an open upper portion, and a male screw portion 12 which can be screwed onto an upper portion of a female screw portion 11 formed on the inner periphery of the filling port 2 at the lower portion. A disk upper portion 3 integrally provided on the upper portion of the male screw portion 12 with a disk portion 13 protruding outward in the radial direction from the male screw portion 12 so as to overlap with the upper end surface 17 of the male screw portion 12 from above, and a desiccant 6 A connecting structure 9 for removably attaching the plug lower part 5 to a downward projection 14 projecting from a lower part of the male screw part 12 of the plug upper part 3, and the female screw. Between the upper end surface 17 of the filling port 2 and the lower surface 18 of the disk portion 13 of the stopper upper portion 3 facing the upper end surface 17 of the filling port 2 by the screwing force of the portion 11 and the male screw portion 12. Rarely, an O-ring 8 that hermetically seals the inside and outside of the gas container 1 forms an anticorrosion plug, and plugs the engaging means 10 having an uneven shape that generates an engaging force for attachment to and detachment from the filling port 2. It is provided outside the upper portion 5.

(Example) Explaining with an illustrated example, the illustrated example is a rust preventive plug A used for a compressed gas container 1 having a substantially cylindrical shape and a filling port 2 formed in a portion 16 protruding from the upper end, The stopper upper part 3 and the stopper lower part 5 are of a type formed separately. The plug upper portion 3 has a male screw portion 12 formed on the filling port 2 and screwed with the screw portion 11 around the lower portion for detachable attachment to the filling port 2. A disk portion 13 for attachment / detachment operation is provided on the outer side of the stopper upper portion 3, and an engagement means 10 for attachment / detachment is provided therein.
Are formed. This engaging means 10 is not limited to the one illustrated as a hexagonal hole 10a for engaging with a hexagonal wrench in FIG. 1, but also a knob 10b protruding in a pan lid shape (FIG. 2) or a disc portion for operating with a fingertip. Knurled 10c around
(FIG. 3) and the like are used. In order to deal with the case where a neck ring 15 described later is provided, the disc portion 13 is formed to have a large diameter to improve operability.

The stopper upper part 3 and the stopper lower part 5 are integrated by a detachable coupling structure 9. The engaging structure 9 is formed by the male screw portion 12 of the stopper upper portion 3.
A ridge provided around the smaller-diameter downward projection 14
9a and a concave groove 9b provided on the inner edge of the upper part of the stopper lower part 5. Therefore, the ridge 9a and the groove 9b include a screw structure. When the desiccant 6 is enclosed in the lower part 5 of the stopper, this connecting structure is used.
Since the stopper upper portion 3 is removed at 9a and 9b, it serves not only as a connecting structure 9a and 9b for the upper and lower stopper portions 3 and 5 but also as a detaching means 7 for enclosing the desiccant 6. The desiccant 6 is a chemical substance which is insoluble in water and may be a water-soluble chemical substance in some cases, and a solid substance which does not drop the powder into the container is preferable, and silica gel, bauxite or the like can be used.

The lower part 5 of the stopper is in the form of a container that enters into the filling port 2 and has a large number of small holes 4 as a means for passing the absorbed moisture at the bottom. The lower part 5 of the illustrated plug is a relatively short type having a length that can be accommodated in the protruding part 16 at the upper end of the container,
It may protrude into the container, and its length can be appropriately increased / decreased together with the amount of the desiccant depending on the demand of the hygroscopic capacity. If the desiccant 6 including the one that changes color depending on the degree of moisture absorption is made transparent, the upper part 3 and the lower part 5 of the plug can easily grasp the current situation. The O-ring 8 is provided when the anticorrosion plug A including the plug upper part 3 and the plug lower part 5 is attached to the filling port 2 of the gas container 1.
The upper end surface 17 of the filling port 2 and the lower end surface of the stopper upper part 3 facing it
The seal means is disposed between the container and the container and shuts the inside and outside of the container in an airtight and liquidtight manner. Reference numeral 15 is a neck ring, which is fixed to the outside of the filling port protruding portion and is used for attaching a cap (not shown).

The anticorrosion plug A of the present invention configured as described above is attached to the filling port 2 as soon as possible after the shot blasting of the inner surface and the subsequent air blowing in the manufacturing process of the gas container are completed. Although the inside of the gas container 1 is in the best atmosphere in the process, the humidity contained in the air cannot be completely removed, so that a certain degree of humidity is observed. On the other hand, in the anticorrosion plug A according to the present invention, the filling port 2 is sealed by the O-ring 8, and the desiccant 6 enclosed in the plug is attached to the lower portion 5 of the plug located at the lower end of the filling port 2. Since the passage means 4 formed at the bottom acts on the inside of the container to continuously perform the moisture absorption, the inner surface of the container is kept in a dry state immediately after manufacturing and does not cause rust.

(Operation of the Invention) Since it is possible to tighten the screw by the engaging means 10 and sufficiently press the O-ring 8 with the tightening force, perfect airtightness can be obtained. The lower plug part 5 is loosely inserted into the filling port 2, and the desiccant 6 absorbs moisture from the small hole 4 in the lower part to the inside of the gas container 1 and the internal thread portion 11 of the inner surface of the filling port 2. When the storage is long, the desiccant 6 is replaced. Male thread
12 can be screwed only on the upper part of female thread 11,
Since it is shorter than 11, the work of tightening or loosening the screw can be reduced, and a reliable sealing property can be obtained, which guarantees the effectiveness of the moisture absorption action.

(Effects of the Invention) Therefore, according to the present invention, since the inside of the unfilled gas container is kept in a highly dry state, rusting can be prevented and impurities are not mixed, so that the practical significance is extremely high. high.
For example, when the desiccant (hygroscopic agent) is directly filled in the gas container, it is difficult to remove the powder, and when the argon or other inert gas is filled, the gas component remains attached to the inner surface, Both reduce the purity of the gas to be charged thereafter, but according to the present invention, such a problem does not occur, and the labor for rust prevention management is minimized. Particularly in the case of the present invention, the male screw portion 12 is screwed onto the upper portion of the female screw portion 11 to fix the entire plug to the filling port 2, and in this state, the O-ring 8 is attached to the upper end surface 17 and the lower surface.
Sealing is perfect because pressure is applied between 18 and workability is good because the screwing amount of the screw is small, and the rust prevention of the internal thread 11 inside the gas container and inside the filling port where rusting is particularly easy is achieved. There is an effect that can be.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 and FIG. 3 are perspective views showing two modified examples of engaging means, FIG. 4 is a longitudinal sectional view, and FIG. The figure is an enlarged cross-sectional view of a main part. 1 ... Gas container, 2 ... Filling port, 3 ... Top of plug, 4 ... Small hole, 5
... lower part of stopper, 6 ... desiccant, 7 ... enclosing means, 8 ... O-ring, 9 ... coupling structure, 10 ... engaging means.

Claims (5)

[Scope of utility model registration request] 1. A small-diameter filling port 2 protruding above the gas container 1 in order to protect the inner surface of the unfilled gas container 1 from rusting.
A plug that is detachably attached to the filling port 2, is loosely inserted into the filling port 2 and is disposed therein, and has a large number of small holes 4 formed in the lower part for allowing moisture in the gas container 1 to pass therethrough, and the upper part is opened. Lower part of the stopper 5 having a hollow cylindrical shape
And a male threaded portion 12 that can be screwed onto an upper portion of a female threaded portion 11 formed on the inner periphery of the filling port 2 is provided at the lower portion, and an external thread is formed so as to overlap the upper end surface 17 of the filling port 2 from above. The upper portion 3 of the stopper, which is integrally provided with the disk portion 13 protruding radially outward from the portion 12 in the upper portion of the male screw portion 12, and the desiccant 6 are put inside the lower portion of the stopper 5, A connecting structure 9 for detachably attaching the plug lower portion 5 to a downward protruding portion 14 protruding from the lower portion of the screw portion 12, and the filling port 2 by the screwing force of the female screw portion 11 and the male screw portion 12. An O-ring 8 that is sandwiched between the upper end surface 17 of the gas container 1 and the lower surface 18 of the disk portion 13 of the plug upper portion 3 that faces the O-ring 8 that hermetically seals the inside and outside of the gas container 1 is attached to and detached from the filling port 2. The anticorrosion stopper for gas containers is provided with an engaging means 10 having an uneven shape for generating an engaging force for the outside of the stopper upper part 5. 2. The rust preventive plug for a gas container according to claim 1, wherein the female screw portion 11 is provided on the entire inner surface of the filling port 2. 3. The rust preventive stopper for a gas container according to claim 1, wherein the stopper lower portion 5 has a cylindrical shape with a bottom, and a hollow interior is provided with a structure capable of being filled with the desiccant 6. 4. A connecting structure 9 for attaching and detaching the lower plug part 5 and the upper plug part 3 is a ridge 9a formed on the outer periphery of a downward projection 14 of the upper plug part 3.
2. The rust preventive plug for a gas container according to claim 1, which comprises a concave groove 9b formed on the inner edge of the mouth of the lower plug part 5. 5. The rust preventive plug for a gas container according to claim 1, wherein the engaging means 10 provided on the stopper upper portion 3 has a shape and structure for engaging a hexagonal wrench, a spanner or other tool.