JPH088751Y2 - Thermos seal structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a seal structure for a portable vacuum double vacuum thermos made of stainless steel, and more specifically, a thermos seal having a highly reliable seal and excellent sealing and heat retaining properties. Regarding the structure.

[0002]

2. Description of the Related Art Conventionally, an O-ring has been used as a packing for sealing a thermos bottle when attaching a base to an inner bottle or attaching an inner stopper. However, due to its shape, the contact area of this O-ring is small, and the sealing and heat-retaining properties are low, and it is difficult to open the O-ring when there is a negative pressure in the inner bottle. Had the difficulty of falling out.

Therefore, a seal structure between the inner bottle and the inner stopper as disclosed in Japanese Utility Model Publication No. 58-39652 has been devised. This seal structure projects outward from the upper end of the packing that is fixed to the inner plug, and then bends downward.
By employing the bent tongue structure forming the tongue Te, aims to increase in the contact area with the sealing surface of the inner bottle, at the same time, if there is no inner bin is that a negative pressure, the inside of the tongue The outside air is made to flow in by bending to, and the pressure inside and outside is made uniform.

[0004]

However, in the seal structure of the above example, the base of the tongue for sealing is bent.
Due to the bent tongue structure, it has the drawback of poor durability and easy fatigue. When fatigue occurs, not only the characteristic inward bending of the tongue piece is impaired, but also the elasticity is lost and the sealing property is impaired, and leakage occurs due to early aging.

Further, in the seal structure, the contact area is O
Although slightly wider than with the ring, the sealing is done in only one place, as with the O-ring. Therefore, for example, when the sealed portion of the inner bottle is deformed by dropping a thermos bottle, there is no structure to supplement the sealing property lost due to the deformation, and it is difficult to maintain the sealing property and the heat retaining property. .

Therefore, this invention can maintain a high sealing performance for a long period of time, and even if the sealing portion of the inner bottle is deformed, the sealing performance can be surely maintained and the reliability of the thermos bottle can be improved. Regarding the seal structure.

[0007]

Means for solving the above-mentioned problems will be described with reference to FIG. 2 showing an embodiment. Its structure is such that the sealing surface 2c of the opening of the inner bottle 2 becomes smaller toward the lower side. is formed on the curved surface, the middle part of the vertical direction of the outer peripheral surface of the annular packing 4 that presses on the sealing surface 2c, the
It protrudes to the sealing surface side , and when sealing, it is the bay of the sealing surface 2c.
Top compressively deformed along the curved shape to form an annular projection 4c is not acute, the lower portion of the lower edge of the packing 4 of the annular projection 4c, inwardly along the curved surface shape of the sealing surface 2c when the seal It is characterized in that it has a sealing structure for the thermos bottle 1 formed on the annular tongue piece 4d that is compressed into.

[0008]

[Action] That is, according the above-described configuration, at the time of sealing compression deforms along the shape of the sealing surface forming the annular ridge in the middle part is a curved surface of the upper and lower packing strength with projecting strip portions <br / > Seal to power. At the same time, sealing is performed with the annular tongue at the lower edge of the packing compressed inward along the curved surface shape of the sealing surface.

[0009]

As a result of the above, according to the present invention, since the top portion of the annular projection for sealing has a right angle or an obtuse angle, its base portion is thick and fatigue is less likely to occur.
Therefore, the hermeticity can be maintained for a long period of time, and the heat retention can be improved.

Further, the sealing is carried out not only by the above-mentioned annular projection but also by the annular tongue at the lower edge of the packing, so that double sealing can be performed at two places. Therefore, for example, even if the thermos is dropped and the sealing portion of the inner bottle is deformed and some sealing conditions are disturbed, another sealing can be reliably maintained,
The reliability can be increased.

Moreover, the above-mentioned annular tongue piece is the above-mentioned annular protrusion.
Since the lower portion of the formed in a shape extending downward, the load on the base of the annular tongue during sealing, a conventional folding
Smaller than the tongue structure and extremely low in fatigue. For this reason, high sealing performance can be maintained for a longer period of time, and the effects of heat retention and leakage prevention can be exhibited more effectively.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 2 is a cross-sectional view showing the upper part of the vacuum double thermos bottle 1 made of stainless steel, and shows the sealing structure between the inner bottle 2 and the base 3 as seen in this figure.

The inner bottle 2 has a mouthpiece fitting step portion 2a for fitting the mouthpiece 3 on the outer surface of the upper portion, and the inner surface of the upper portion bulges inward. And this bulge 2b
And a sealing surface 2c having a rounded cross section with a smaller diameter toward the lower side.

Further, the above-mentioned base 3 has a double-wall structure in which the upper edge is connected, and the lower end of the outer peripheral wall is fitted with the fitting portion 3a corresponding to the mouth-fitting step 2a of the inner bottle 2 described above. And the packing fitting step 3b is formed at the lower end of the inner peripheral wall.
Is formed. The packing-fitting step portion 3b has an outer peripheral surface on the lower end side having a smaller diameter than that on the upper end side, the lower side separated by a predetermined length is tapered, and the lower end forms a slight flat portion. . The female screw 3c formed on the inner peripheral surface of the inner peripheral wall is for attaching an inner plug (not shown).

The packing 4 for sealing the inner bottle 2 and the mouthpiece 3 as described above is formed in a shape as shown in FIG. 1 using, for example, silicon rubber having an altitude of 50 °. That is, the shape, the inner peripheral surface 4a of an annular form so as fit corresponding to the packing for fitting stepped portion 3b of the inner peripheral wall lower portion of the mouthpiece 3 described above, the outer peripheral surface of the upper end, the outer A convex strip 4b projecting in the direction, and an annular projecting strip 4c projecting toward the sealing surface 2c and having a right-angled top is formed in an intermediate portion extending from the convex strip 4b toward the lower end edge, and an annular tongue is formed at the lower end edge. Piece 4
d is formed.

The above-mentioned protruding ridge 4b at the upper end is the amount of protrusion which comes into pressure contact with the inner side surface of the inner bottle 2 when the base 3 is fixed, and the top is formed approximately at a right angle.

Further, the annular protrusion 4c at the intermediate portion described above is
The outer surface of the inner bottle 2 is formed into an L shape so that the top surface of the inner bottle 2 is pressed against the sealing surface 2c at a substantially right angle. The annular projection 4c may be formed at an obtuse angle larger than a right angle. Further, the annular tongue piece 4d at the lower edge described above.
Has a lower end that is slightly thinner, and is slightly inclined in the inner circumferential direction.

When the inner bottle 2 and the mouthpiece 3 are sealed using such a packing 4, the convex ridge 4b at the upper end is pressed against the inner side surface of the inner bottle 2 and the annular ridge 4c in the middle portion is
The seal surface 2c is compressed and deformed along the rounded shape, and a strong seal is achieved. At the same time, the annular tongue piece 4d extending from the lower end edge is compressed inward to provide a strong seal.

According to such a seal structure, since the top of the annular projection 4c forming the seal is a right angle, the base is thick, and the degree of fatigue caused by the compression applied to the free end side of the annular projection 4c is small. Therefore, the hermeticity can be maintained for a long period of time, and improvement in heat retention performance and durability performance can be expected.

Further, since the sealing is performed not only by the above-mentioned convex strip 4b and annular projection 4c but also by the annular tongue piece 4d extending to the lower end edge, sealing is performed at least at three points on the sealing surface. For example, even if a part of the seal surface 2c of the inner bottle 2 is deformed by dropping the thermos bottle and some seals are disturbed, it can be compensated by another seal and reliability can be improved. .

Moreover, the base of the annular projection 4c is thick and the degree of fatigue is small, and the base of the annular tongue 4d also has a shape extending downward from the lower part of the annular projection 4c.
That result not impose an excessive load at the time of sealing, it is possible to obtain a sealed state to withstand long-term use, it is possible to expect a further sealing effect.

In the above description of the embodiment, the seal structure of the inner bottle and the cap is used. However, for example, the seal structure between the inner bottle and the inner stopper screwed into the opening of the inner bottle. It is also possible to adopt.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing a packing.

FIG. 2 is a sectional view of a main part of a thermos bottle.

[Explanation of symbols]

 1 ... Vacuum double thermos bottle 2 ... Inner bottle 2c ... Sealing surface 4 ... Packing 4c ... Annular protrusion 4d ... Annular tongue

Claims (1)

[Scope of utility model registration request] 1. A thermos sealing structure for sealing by sealing a sealing surface of an opening of an inner bottle by pressing an annular packing against the sealing surface of the opening of the inner bottle. A ring-shaped ridge formed on the surface, at the intermediate portion in the vertical direction on the outer peripheral surface of the annular packing, protruding toward the sealing surface side , and compressing and deforming along the curved surface shape of the sealing surface at the time of sealing, and the top is not an acute angle. formed, the annular ridge of the lower edge of the lower packing, the sealing time thermos sealing structure formed in an annular tongue which is caused to compress inward direction along the curved surface shape of the seal surface.