JPH025155Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is suitable for vacuum storage and vacuum drying of fruits and vegetables.
This invention relates to a sealing device for a concrete vacuum container used for vacuum cooling and the like.

[Conventional technology]

Conventionally, vacuum containers are mainly made of metal, but in the case of relatively large vacuum containers, such as those used for vacuum storage, vacuum drying, and vacuum cooling of fruits and vegetables, metals such as iron are used. If the container is made of materials, the material cost and processing cost are high, so the container itself becomes quite expensive, and this tendency becomes more pronounced as the container becomes larger. Therefore, it is conceivable to manufacture a large vacuum container using concrete, which has relatively low material and processing costs, but since concrete is porous, there are many leaks that permeate through it.
In addition, it has been generally considered difficult to make vacuum containers from concrete because the surface processing accuracy is poor, that is, the surface is extremely uneven, causing leakage from the sealing portion.

[The problem that the invention attempts to solve]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a sealing device for a concrete vacuum container that can suppress leakage caused by the unevenness and permeability of concrete and ensure high airtightness.

[Means for solving problems]

In order to achieve the above object, the sealing device for a concrete vacuum container according to the present invention has an opening of the container on the peripheral edge surface of the concrete container that engages with the lid or on the contact surface of the lid. A groove is provided at a position surrounding the container, a permeation-preventing paint layer is applied to the surface of the container, a gasket is installed in the groove, and a groove is provided adjacent to the gasket on the end peripheral surface or the abutting surface higher than the gasket. It is characterized by a soft patch that stretches.

[Effect]

In the operation of the device of the present invention constructed in this way, first, the lid is positioned with respect to the opening of the concrete container, and when the inside of the container is started to be evacuated, the soft packing first acts as a seal. Thereafter, when atmospheric pressure is applied, the peaks of the gasket disposed in the grooves on the peripheral edge of the container are pressed and deformed, thereby achieving high airtightness.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In the drawings, reference numeral 1 denotes a container made of concrete, and a trapezoidal groove 2 is previously formed on the peripheral edge surface of the concrete when the concrete is molded. The outer and inner surfaces of the concrete container 1 are coated with a thick and uniform coating of epoxy resin, polyurethane, or the like, as indicated by reference numeral 3, to prevent permeation. A gasket 5 is fitted into a trapezoidal groove 2 formed on the peripheral edge of the container 1 to surround the opening 4 of the container 1.
Adjacent to this annular gasket 5, a similarly annular soft packing 6, which protrudes higher than this gasket 5, is fixed. Reference numeral 7 denotes a lid made of concrete, the outer surface of which is coated with a thick coating 8 of epoxy resin, polyurethane, etc., similarly to the container 1.
Note that the lid 7 may be made of other materials, such as metal, instead of concrete. Furthermore, in the illustrated embodiment, the gasket 5 and the soft packing 6 do not necessarily need to be provided on the container 1, but can be provided in the same manner on the lid 7, and if the case requires the gasket 5 to be attached to the container 1 and the lid 7. provided on one side of
A soft packing 6 may be provided on the other side. Furthermore, if necessary, the gasket 5 may be provided on the outside and the soft packing 6 may be provided on the inside.

In the operation of the container configured in this way, the lid 7
When closing the container 1 to create a vacuum, the lid 7 is first moved to a position adjacent to the opening 4 of the container 1, and the inner surface of the lid 7 is brought into contact with the soft packing 6. In this state, the container 1 is evacuated from an exhaust port (not shown) provided at an appropriate position by a vacuum pump system (not shown). When the vacuum starts to be drawn in this way, the soft packing 6 first acts as a seal, and then as the vacuum continues, atmospheric pressure is applied from the outside, and the peaks of the gasket 5 are pressed and deformed. , sufficient sealing is achieved. By configuring the container to perform the sealing in two stages as described above, the container can be vacuum-sealed more reliably and effectively, and the vacuum pump system can be used efficiently.

[Effect of idea]

By configuring as explained above,
The present invention provides the following effects.

(1) By forming the groove into which the gasket is fitted into a trapezoidal shape, concrete can be easily molded.

(2) By using trapezoidal grooves, there will be relief when the gasket is deformed, so concrete
No excessive stress that could cause cracks to be applied to the parts.

(3) By applying paint, it is possible to eliminate the unevenness and permeability of the concrete surface and prevent leakage from penetrating through the concrete.

(4) Extremely high airtightness can be maintained by two-stage sealing using a soft packing and a gasket.

(5) Since it is made of concrete, large vacuum containers can be provided at relatively low cost.

[Brief explanation of the drawing]

The drawing is a schematic cross-section of a main part showing an embodiment of the present invention. In the figure, 1: concrete container, 2: groove, 3:
Paint layer, 5: Gasket, 6: Soft packing,
7: Lid.

Claims (1)

[Scope of utility model registration request] A groove is provided at a position surrounding the opening of the container on the end circumferential surface of the concrete container that engages with the lid or on the contact surface of the lid, and a permeation-preventing paint layer is applied to the surface of the container. A concrete structure characterized in that a gasket is installed inside the concrete, and a soft packing extending higher than the gasket is installed adjacent to the gasket on the end peripheral surface or the contact surface.
A sealing device for vacuum containers made in Japan.