JPS6255895B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stopper for forming a vacuum, and more specifically, the present invention relates to a stopper for forming a vacuum, and more particularly, a through hole is provided at an arbitrary position on the wall of a vacuum device such as a container to be formed into a vacuum such as a thermos flask or a heat-retaining lunch box. The present invention relates to a simple vacuum-forming stopper that can be fitted into a hole to suction internal gas and also perform a sealing function after suction.

Conventionally, this type of device generally includes a suction valve provided on the wall of a container or the like.

However, such valves are carefully installed at predetermined locations on the container wall in factories, etc., in order to improve the sealing performance between the valve body and the container wall. In addition to the disadvantage that it cannot be freely installed on site at any position on the vessel wall, it also has the disadvantage of being generally expensive.

The purpose of the present invention is to provide a simple vacuum forming stopper that can be installed extremely easily with good sealing properties at any position on the container wall, and is characterized by the fact that A seal ring having an inner diameter larger than the diameter of a through hole provided at an arbitrary position in the vessel wall, and a seal ring that surrounds the through hole and is in close contact with the outer surface of the vessel wall, and a large diameter flange that fits tightly into the seal ring. and a small-diameter insertion part that tightly fits into the through hole provided in the vessel wall, and a blind hole-shaped suction pipe insertion hole that opens approximately at the center of the end surface of the flange part of the plug body, Place the plug body so that its flange part fits slightly into the seal ring.
A communication hole that communicates the suction pipe insertion hole with the annular space between the stepped wall between the flange part and the fitting part formed when the flange part and the fitting part are pushed into the vessel wall, and the suction pipe insertion hole is passed through the fitting part, A suction hole or a suction groove that opens on the outer wall surface and communicates the annular space with the inside of the vacuum device is provided in the fitting part, and the opening of the communication hole that opens into the annular space connects the plug body to the stepped wall. The hole is positioned so that it is closed by the inner wall surface of the through hole when the hole is pushed into the position until it comes into close contact with the outer surface of the container wall.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below based on the accompanying drawings.

Reference numeral 10 denotes a vacuum device such as a container to be kept in a vacuum, and a through hole 14 of a predetermined diameter is drilled or otherwise placed in an arbitrary position of the container wall 12, for example, in a position close to a negative pressure source such as a vacuum pump (not shown). Make a hole by.

16 is a seal ring made of a material with elasticity and excellent sealing properties such as rubber or synthetic resin, and has a predetermined thickness and an inner diameter larger than the diameter of the through hole 14; As shown in the figure, it is tightly attached to the outer surface of the vessel wall 12 using an adhesive or the like so as to surround the through hole 14.

Reference numeral 18 designates a plug body made of a material with elasticity and excellent sealing properties, such as rubber or synthetic resin. The flange portion 22 is integrally formed.

Reference numeral 24 designates a blind suction pipe insertion hole opened approximately at the center of the end surface of the flange portion 22, and its depth extends to the middle of the insertion portion 20.

Reference numeral 26 denotes a communication hole, which is bored from the inner wall of the suction pipe insertion hole 24 and opens to the outer wall surface of the insertion part 20. Reference numeral 28 denotes a suction hole, which is provided from the outer wall surface of the fitting portion 20 to penetrate the fitting portion 20, and communicates the outer wall surface of the fitting portion 20 with the inside of the container 10. The opening positions of the communication hole 26 and the suction hole 28 on the outer wall surface of the fitting part 20 are as follows.
When the stopper body 18 is slightly pushed into the seal ring 16 as shown in FIG. It faces an annular space A surrounded by a surface. The opening position is such that when the stopper body 18 is pushed in until the step wall 30 comes into close contact with the outer surface of the container wall 12, the opening is closed by the inner wall surface of the through hole 14, as shown in FIG. It is set.

Next, the operation will be explained.

First, as shown in FIG. 1, the seal ring 16 is aligned with the axis of the through hole 14 and tightly attached to the outer surface of the vessel wall 12 using an adhesive or the like. Next, the plug body 18 is attached to the seal ring 16 and the through hole 1 so that the space A is formed.
Push it inside 4. Note that in order to position and tightly fit the seal ring 16 as described above, the seal ring 16 is fitted and held on the flange portion 22 in advance, and the fitting portion 20 of the plug body 18 is fitted into the through hole 14. You can also use it to locate the camera. Next, the tip of the suction pipe 32 connected to a negative pressure source such as a suitable vacuum pump (not shown) is inserted into the suction pipe insertion hole 24 to a position that does not block the communication hole 26.

When the negative pressure source such as a vacuum pump is operated with the settings as described above, the gas inside the container 10 will flow through the suction hole 28, the space A, the communication hole 26, and the suction pipe insertion hole 2.
4. It is discharged through the suction pipe 32. With this discharge, the inside of the container 10 becomes negative pressure, and this negative pressure suction force is applied to the stopper body 18. When the frictional resistance between the stopper body 18 and the seal ring 16 becomes larger than the sum, the stopper body 18 is attracted, and the step wall 30 comes into close contact with the outer surface of the container wall 12. At this point, the communication hole 26 and the suction hole 28 are closed by the inner wall surface of the through hole 14, and the discharge of gas is stopped. Even if the suction pipe 32 is removed at this point, the communication hole 26 and the suction hole 28 are closed as described above, and the flange portion 22 is connected to the seal ring 16, and the fitting portion 20 is connected to the through hole 1.
4, so no outside air can enter.

Note that in order to further improve the sealing performance, the suction pipe 32 may be pushed into the suction pipe insertion hole 24 until the opening of the communication hole 26 is closed, and the upper portion thereof is cut at that position and left in the insertion hole 24. The communication hole 26 may be closed off from both sides by the inner wall of the through hole 14.

Since the degree of negative pressure within the container 10 is set by the above-mentioned frictional force, the degree of negative pressure can be adjusted, for example, by setting the outer diameter of the flange portion 22 to be larger than the inner diameter of the seal ring 16.

Further, as shown in FIG. 4, the degree of negative pressure can be adjusted by forming a tapered surface on the flange portion 22. Even if the suction hole 28 is formed in a suction groove 29 shown in FIG. 4, similar effects can be obtained.

If the thickness of the container wall 12 of the container 10 is not sufficient, a patch plate 34 may be fixed at a predetermined position on the container wall 12 to provide a through hole 14 as shown in FIG. As shown, the through hole 14 is formed so that a vertical piece 36 facing inward of the container is formed in the container wall 12.
It is recommended that holes be drilled.

As described above, the vacuum forming stopper according to the present invention can be used simply by providing a through hole in the vessel wall.
It can be easily attached to the vessel wall at the site, and has the advantage of being highly versatile. In addition, the suction operation is easy, the sealing performance is excellent, and it has a simple structure and can be provided at low cost.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the start of suction with the stopper attached to the vessel wall, Fig. 2 is a plan view of the stopper, Fig. 3 is a sectional view showing the end of suction, and Fig. 4 shows another embodiment. The partial sectional views, FIGS. 5 and 6, are explanatory diagrams showing a preferred embodiment in which a through hole is provided in the vessel wall. 10... Vacuum device, 12... Instrument wall, 14... Through hole, 16... Seal ring, 18... Stopper body, 2
0... Fitting part, 22... Flange part, 24... Suction pipe insertion hole, 26... Communication hole, 28... Suction hole, 29... Suction groove, 30... Step wall, 32...
Suction pipe, 34...batten plate.

Claims (1)

[Scope of Claims] 1. Having an inner diameter larger than the diameter of a through hole provided at an arbitrary position in the wall of a vacuum device such as a container to be evacuated, and tightly contacting the outer surface of the wall of the container surrounding the through hole. A plug body is provided, which is formed of a large-diameter flange portion that fits tightly into the seal ring and a small-diameter fitting portion that tightly fits into the through hole provided in the vessel wall, and the flange of the plug body A blind hole-shaped suction pipe insertion hole that opens almost at the center of the end face of the plug is provided, and the step between the flange part and the fitting part is formed when the plug body is pushed into the sealing position so that the flange part fits slightly into the seal ring. A communication hole that communicates the suction pipe insertion hole with an annular space surrounded by the wall, the outer surface of the vessel wall, the inner wall of the seal ring, and the outer surface of the fitting part is opened on the outer wall surface of the fitting part. In addition, a suction hole or a suction groove that communicates between the annular space and the inside of the vacuum device is provided in the fitting part, and the opening of the communication hole that opens into the annular space connects the plug body to the outer surface of the vessel wall. A vacuum forming stopper is positioned so that it is closed by the inner wall surface of the through hole when the plug is pushed into the position until it comes into close contact with the through hole.