JPH0352692Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is for vacuum-sealed containers between the container body and the lid to maintain a vacuum state for a long time in vacuum-sealed containers for the purpose of preserving food, etc. It's about Patsukin.

(Conventional technology) Conventionally, this type of gasket is made of molded vulcanized rubber,
It is molded using injection molded synthetic resin elastomer to match the shape of the packing case. Furthermore, in order to improve the cushioning properties, hollow packings are produced by bonding or fusing hollow cross-sectional bodies into a ring shape by extrusion molding.

(Problem to be solved by the invention) If the packing is a solid elastic body that is integrally molded, even if it is a soft elastic body, it will become hard when it is inserted into the packing case. Initial contact between the main body and the lid cannot be achieved through the . Therefore, in the conventional method, a stopper was used to engage the main body and the lid in order to obtain initial close contact. In addition, when using a hollow packing, the above-mentioned initial adhesion can be obtained, but when the inside of the container is in a vacuum state due to the vacuum pump, a part of the packing is drawn into the negative pressure side due to the pressure difference between the inside and outside, resulting in a relatively short period of time. The problem was that it leaked over time.

For vacuum-sealed containers where the main body and lid are in contact with each other through a gasket, a check valve is installed on the lid, and if the gasket has a large cushioning property, the air inside can flow out from the air hole of the check valve by lightly pressing the lid with your hand. However, when the pressure is released, the check valve prevents air from entering from outside, and the body and lid come into close contact. Then, if a suction cup provided at the tip of the suction pipe of the vacuum pump is placed over the check valve, the air inside the check valve is sucked through the air hole of the check valve, and an initial vacuum is obtained. However, in the case of a solid packing, it becomes hard when inserted into the packing case, and initial adhesion cannot be obtained simply by pressing the lid.

The present invention is designed to solve these conventional problems.

(Means for Solving the Problems) The gist of the present invention is to provide a channel-shaped packing case connected to the periphery of the lid of a vacuum-sealed container consisting of a container body and a lid equipped with a check valve. It is a packing that is fitted into the packing case, and the packing has a hollow part, an air vent hole or groove leading from the hollow part to the negative pressure side, that is, the inside of the container body, and the entire circumference of the side facing the outer peripheral inner wall of the packing case. According to the present invention, there is provided a packing for a vacuum-sealed container characterized by having a band-shaped protrusion that is in close contact with the side wall.

According to the present invention, by forming a hollow part in the packing and providing an air vent hole or groove leading from the hollow part to the negative pressure side, a hollow part is formed before pressing, and when pressed, the hollow part is opened. Since the air exits to the negative pressure side, the packing as a whole can have great cushioning properties. Furthermore, since a thin band-shaped protrusion is provided along the entire outer peripheral edge of the packing case, that is, the side opposite to the outer circumferential inner wall of the packing case, this band-shaped protrusion creates a pressure difference between the inside and outside of the outer circumferential inner wall of the packing case. It is possible to prevent leaks because they come into close contact when a leak occurs.

The present invention will be explained based on embodiments shown in the drawings.

Fig. 1 is an explanatory diagram showing the cross section of the vacuum sealed container of the present invention, Fig. 2 is a sectional view of a packing made of two molded punching blocks, and Fig. 3 is a sectional view of a hollow packing obtained by extrusion molding. The cross-sectional view, FIG. 4, is an explanatory cross-sectional view of the gasket shown in FIG. 2 when it is maintained in a vacuum state.

In the figure, 1 is the lid of the container, and 3 is the container body. Reference numeral 2 denotes a hollow packing consisting of two blocks fitted into a packing case 2a at the periphery of the lid, and is configured in an endless shape so as to uniformly abut against the upper end surface of the container body 3. The packing 2 is made of an elastic material such as rubber or soft resin, and is molded into two blocks 6 and 7 as shown in FIG.
is beginning to form. In this case, there are several places around the area with a width of 1 mm leading from the hollow part 10 to the negative pressure side.
An air hole 9 of the same size as that shown in FIG. Further, a band-shaped projection 8 is formed on the outer peripheral edge of the block 7 over the entire circumference so as to be in close contact with the outer peripheral inner wall of the packing case 2a.

In the case of an extruded material, an air hole 9 communicating from the hollow part 10 to the negative pressure side is provided as shown in FIG. 3, and a protrusion 8 having the same structure as that shown in FIG. Cut it to a length that fits the packing case and glue or fuse both ends to form a ring shape. In FIG. 1a, 4 is a check valve, and 5 is an air hole provided in the lid 1. Details of the check valve 4 are shown in FIG. 1b. In the illustrated embodiment, the check valve 4 is shaped like a mushroom umbrella, and has a protrusion 4a at the lower center.
A notch 4b is provided at a portion corresponding to the back side of the periphery of the umbrella. A protrusion 4a of this check valve is inserted into the opening of the lid 1 from the front side, and the protrusion 4a prevents the check valve 4 itself from coming off from the opening. The diameter of the shaft 4d of the check valve is smaller than the diameter of the opening, so the shaft itself may be freely movable within the opening. At this time, the peripheral end surface 4c of the umbrella is brought into airtight contact with the surface of the lid 1. Reference numeral 5 denotes an air hole provided in the lid facing the notch 4b. Note that the structure of the check valve is not limited to this embodiment, and it goes without saying that other structures may be used.

Since the present invention is constructed as described above, the first
When the lid 1 is pressed in the state shown in Figure a, the gasket 2 is compressed as shown in Figure 4, the air in the hollow part 10 is discharged into the container through the air hole 9, and the air in the container is replaced by the air in the lid. It is discharged to the outside through the hole 5.

When the pressure is released, the check valve 4 acts and closes the air hole 5, reducing the pressure inside the container and creating a pressure difference between the container and the outside. In close contact. Furthermore, by placing a suction cup provided at the tip of the suction pipe over the check valve 4 and suctioning the container using a vacuum pump, the air inside the container is exhausted and a vacuum state is created.

As described above, in this invention, since the packing has good cushioning properties, by simply pressing the lid lightly, the air inside can be pushed out through the check valve, creating a pressure difference between the inside and outside, and the lid and main body can be easily brought into a tight contact state. It can be done. Therefore, after that, the inside of the container can be drawn into a vacuum state using a vacuum pump. Particularly in the case of rectangular and deep containers, it is difficult to obtain initial adhesion with a solid packing formed by molding, even if a particularly soft elastic material is used. Close contact can be achieved. On the other hand, if a hollow packing is used, it is easier to obtain an initial adhesion condition, but on the other hand,
The stronger the degree of vacuum, the easier it is for the gasket to be drawn into the negative pressure side, and there is a risk that the vacuum state will leak in a short period of time, but according to the present invention, this drawback can also be overcome.

(Effects of the invention) As described above, although the packing of the invention has an extremely simple structure, it is easy to obtain an initial adhesion state when the pressure inside the container is reduced, and it has a sealing effect that allows the vacuum state to be maintained for a long time. can provide an excellent vacuum storage container.

[Brief explanation of drawings]

Fig. 1a is an explanatory diagram of a vacuum-sealed container using the packing according to the present invention, Fig. 1b is a detailed explanatory diagram of an example of a check valve, and Fig. 2 is an explanatory diagram of a vacuum-sealed container using a packing according to the present invention. An explanatory diagram of the cross section of the hollow packing, FIG. 3 is a cross-sectional view of the packing manufactured by extrusion molding, and FIG.
Furthermore, it is an explanatory view showing a cross section of the packing of the present invention when suction is applied with a vacuum pump. 1: Lid, 2: Packing, 2a: Packing case, 3: Main body, 4: Check valve, 5: Air hole, 6,
7: Block, 8: Protrusion, 9: Air hole, 10 : Hollow part.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A seal that is fitted into a channel-shaped packing case connected to the periphery of the lid of a vacuum-sealed container consisting of a container body and a lid equipped with a check valve. The packing is in close contact with the side wall over the entire circumference of the hollow portion, the air vent hole or groove leading from the hollow portion to the negative pressure side, that is, the inside of the container body, and the side facing the inner outer peripheral wall of the packing case. A gasket for vacuum-sealed containers, which is characterized by having band-shaped protrusions. (2) The packing for a vacuum-tight container according to item (1), wherein the hollow portion is formed by integral molding. (3) The packing for a vacuum-tight container according to the preceding item (1), wherein the hollow portion is constituted by two packing blocks.