JPH0315468Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a composite drum with a double structure, in which an inner container made of a plastic such as polyethylene is further housed inside a metal drum made of iron or the like that contains a chemical solution, etc. Concerning the improvement of containers, the purpose is to make them suitable for storing and transporting chemicals that are highly corrosive to metals, or that come in contact with metals and are colored and have an adverse effect on their quality. The aim is to provide composite containers with

(Prior art and its problems) A conventional composite container suitable for filling this kind of special chemicals consists of a plastic inner container A inside a metal drum B, as shown in Fig. 1. The top plate 2 of the internally installed drum B is provided with openings 10 for a liquid inlet 3, a ventilation port 4, etc., and the top plate 1 of the internally installed container A is provided with an opening 10, as shown in detail in FIG. A threaded opening 11 protruding from the opening 10 of the drum B is formed so that the space 30 between the metal drum B and the plastic inner container A is sealed.
The joint between the top plate 2 of the drum B and the top plate 1 of the inner container A on the outer periphery of the opening 10 is sealed with packing or the like.

In FIG. 2, the opening 10 of the top plate 2 of the drum B forms a rising portion on its inner peripheral edge toward the outside of the can, and the threaded opening 11 of the inner container A protrudes from the opening 10 to the outside of the can. The outer surface is in contact with the inner peripheral edge of this rising portion. This threaded opening 11 can, for example, insert a preformed threaded insert 12' into the inner container A.
It is formed by being welded to the inner wall of the cylindrical part 12 which is connected to the top plate of the cylindrical part 12. 14 is a plug, insert 1
A cap 16 is screwed into the inner circumferential screw 17 of 2' through a packing 15, and a cap 16 is placed on the threaded opening. The top plate 2 of the outer drum B and the top plate 1 of the inner container A are joined near the opening 10, and a packing 18 is provided at the joint. However, even though the space 30 was sealed in this manner, some leakage of the filled chemicals into the outside air was observed.

(Means for solving the problem) As a result of studying the causes of chemical liquid leakage in the conventional sealed composite container as described above, the present inventor found that
It was determined that this was due to the space between the lower part of the rising part of the top plate opening of the drum and the lower part of the cylindrical part of the threaded opening of the inner container not being sealed.
The object of the present invention is to provide a composite container that solves this drawback by simple means.

That is, the present invention is a composite container that has a double structure in which a plastic inner container is housed in a metal drum, and the threaded opening of the inner container protrudes from the top opening of the drum. When sealing the joint with the threaded opening of the container to seal the space between the outer drum and the inner container,
The top plate opening of the drum has a cylindrical rising part whose periphery is bent toward the outside of the can, and the outer surface of the upper part of the cylindrical part of the threaded opening of the inner container is brought into contact with the inner surface of the rising part. This relates to a composite container in which the packing is vertically inserted to seal the space between the lower part of the rising part of the top plate opening and the lower part of the cylindrical part of the threaded opening of the inner container. The embodiment will be explained with reference to the drawings.

In the conventional composite container, as shown in FIG.
0, and an annular packing 18 is disposed on the joining surface to seal a space 30 between the drum and the inner container. However, in this case, the space 19 between the rising lower part of the top plate opening and the lower part of the cylindrical part of the threaded opening of the inner container, which exists inside the packing 18 toward the opening, is not sealed. This space part 1
Although the volume of No. 9 is small, it has been found that water and chemicals that have passed through the wall of the plastic inner container accumulate there, perform a breathing action due to the temperature difference between day and night, and leak to the outside. Furthermore, due to the temperature difference between day and night, the plastic inner container undergoes the so-called breathing action of swelling and contraction, but it was found that the packing of the horizontal joint surface tends to loosen during this breathing action, and it is also difficult to tighten. .

In this invention, as shown in FIG.
The cylindrical rising part 10 provided in the top plate opening of the inner container is brought into contact with the cylindrical part 12 of the threaded opening 11 of the inner container, and the cylindrical packing 20 is vertically inserted into this contact surface, By also sealing the space 19, a completely sealed composite container can be obtained. That is, this vertical abutment surface allows for easy tightening of the packing 20, and is less susceptible to the influence of the internal drum's breathing action due to the temperature difference between day and night, resulting in complete sealing.

In addition, in FIG. 3, not only the cylindrical packing 20 but also the annular packing 1 as in the case of FIG.
Of course, 8 may be provided on the horizontal joint surface of the opening periphery.

The present invention thus provides the threaded opening 1 of the inner container A.
By changing the sealing structure between 1 and the opening of drum B,
By simply positioning the cylindrical packing at the top end, this is a practically useful idea that solves the problem of chemical leakage from a space that has not been sealed in the past.

[Brief explanation of the drawing]

FIG. 1 is an overall sectional view of a composite container, FIG. 2 is a sectional view of the main part of the mouth of a conventional composite container, and FIG. 3 is a sectional view of the main part of the mouth of the composite container of the present invention. A: Inner container, B: Metal drum, 1: Inner container top plate, 2: Drum top plate, 10: Top plate opening, 1
1: Threaded opening, 12: Cylindrical part, 14: Plug, 1
8: Annular packing, 20: Cylindrical packing.

Claims (1)

[Scope of utility model registration request] In a composite container that has a double structure in which a plastic inner container is housed in a metal drum, and the threaded opening of the inner container protrudes from the top opening of the drum, the top opening of the drum and the threaded opening of the inner container are When sealing the space between the outer drum and the inner container by sealing the joint with the opening, the top plate opening of the drum forms a cylindrical rising part with the periphery bent toward the outside of the can, and the inner container is attached to the inner surface of the opening. The outer surface of the upper part of the cylindrical part of the threaded opening of the container is brought into contact with the outer surface of the upper part of the cylindrical part of the threaded opening of the inner container, and a cylindrical packing is vertically inserted into this abutting surface, so that the lower part of the rising part of the top plate opening and the cylindrical part of the threaded opening of the inner container are brought into contact with each other. A composite container that also seals the space between the lower part and the lower part.