JPH01240487A - Pressure resistant/heat insulating tank - Google Patents

Abstract

PURPOSE:To obtain a light weighted, compact and cheap pressure resistant heat- insulating tank, by equipping a flexible sheet state inner shell, a rigid skelton framing which surrounds the inner shell and a flexible sheet state outer shell which surrounds the skelton framing, and unifying the inner and outer shells by filling and foaming an expandable plastic in the divisional space which has been constituted with the skelton framing between the inner and outer shells. CONSTITUTION:An inner shell 11 is formed with a flexible sheet according to the internal shape of a desired tank. Using an end plate 12 on the upper part as a base, the inner shell 11 is surrounded with a skelton framing 13 for which a strengthening member 13A in the longitudinal direction and a strengthening member 13B in the circumferential direction are mutually assembled in a honey-comb structure, utilizing formed notches 14. Further, the skelton framing 13 is surrounded with a flexible sheet state outer shell 15, and an expandable plastic 16 is filled and foamed in the divisional space between the inner and outer shells. At the time of filling and foaming, the inner and outer shells are held by jigs, etc., which are placed inside and outside of the inner and outer shells. When the expanded plastic hardened, the inner shell, skelton framing and outer shell are unified, and a strong pressure resistant/heat insulating tank can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pressure-resistant and heat-insulating tank (hereinafter abbreviated as tank) for air conditioning of thermal storage water in buildings, residences, etc., and for wI thermal storage systems.

[Conventional technology]

Traditionally used tanks of this type are made of iron, stainless steel,
Most of them had simple surface structures made of a single material such as concrete, FRP, or plastic.

[Problem to be solved by the invention]

As mentioned above, tanks made of a single material such as iron, stainless steel, concrete, FRI', or plastic have no problems if they have a small capacity such as 300 to 5001, but as the diameter and other dimensions increase, the strength increases. If it is insufficient, especially if the internal pressure is large, there is a drawback that it lacks pressure resistance.

Also, as the internal pressure increases, the wall thickness increases and more material is used, thus making it more expensive. Furthermore, there are limits to the transportation of large tanks produced in factories to installation sites due to traffic regulations.

Figure 8 shows an example of a conventional tank, in which the inner shell 1 is constructed by welding curved plates made of stainless steel, and the space between the inner shell 1 and the outer shell 2 is filled with a heat insulating material 3 such as glass wool or urethane. Fill it. However, since a strong internal pressure is applied perpendicularly to the wall of the inner shell 1, which has a simple planar structure, the wall easily bends, and if the internal pressure increases, it will break.

The purpose of the present invention is to three-dimensionalize the strength member of the wall part so that it can be covered with a relatively small amount of material, and also to provide strength to the insulation material.
It is an object of the present invention to provide a pressure-resistant and heat-insulating tank that is lightweight, low in bulk, and therefore inexpensive.

[Means for Solving the Problems] The above object includes a flexible sheet-like inner shell formed along a rotational surface around the longitudinal axis of an ellipse, a plurality of substantially circumferential strength members, and a plurality of substantially circumferential strength members. A rigid frame structure that is three-dimensionally configured by combining a substantially longitudinal strength member and surrounds an inner shell indicated by F, and a flexible sheet-like outer shell that surrounds the frame structure, This is achieved by forming a pressure-resistant and heat-insulating tank in which the inner shell, the frame structure, and the outer shell are integrated by filling and foaming foamed plastic into the compartment space defined by the frame structure between the inner and outer shells.

[For production]

Next, the operation will be explained with reference to FIG. First, the inner shell 11 is formed from a flexible sheet to match the desired internal shape of the tank. A longitudinal strength member 13 based on the upper end plate 12
A frame structure 13 assembled into a honeycomb shape using mutually formed notches 14 between A and a circumferential strength member 13B.
surrounds the inner shell 11. Furthermore, a flexible sheet-like outer shell 1
5 surrounds the frame structure 13, and the compartment spaces in the inner and outer shells are filled with foamed plastic 16 and foamed. During filling and foaming, the inner and outer shells are held inside and outside the inner and outer shells using jigs or the like. When the foamed plastic hardens, the inner shell, frame structure, and outer shell are integrated to create a strong pressure-resistant and insulated tank.

〔Example〕

First Example (FIGS. 1 to 4): First, a flexible sheet-like inner shell 11 is formed along a plane of rotation around the longitudinal axis of an ellipse. The inner shell 11 is then surrounded to form a rigid framework structure 13. To form the skeletal structure, a plurality of arcuate longitudinal strength members 13A and annular circumferential strength members 13B, each having one end connected to the upper end plate 12 and the other end connected to each other, are connected to each other by forming notches in each other. 14 in a honeycomb shape and fixed using means such as adhesion or welding. Further, the frame structure 13 is surrounded by a flexible sheet-like outer shell 15 at a predetermined interval. A foamed plastic ink 16 made of foamed polyurethane or the like is filled and foamed into the space defined by the frame structure between the inner and outer shells thus formed. When the foamed polyurethane hardens, a heat insulating layer is formed between the inner and outer shells, and it also penetrates into the compartment space and serves as a strong pressure-resistant hack amplifier material for the inner shell 11. Although polypropylene, polyethylene, etc. can be used as the material for each of the above-mentioned flexible sheets, it is particularly desirable that the inner shell 11 has heat resistance in consideration of the high-temperature contents. Manufacturing is facilitated by forming a flexible sheet.

Second embodiment (Fig. 5): In Fig. 5, a frame structure 13 is constructed by passing a pipe-shaped longitudinal strength member 13c through a plurality of annular circumferential strength members 13I) and then soldering or welding the pipe-shaped longitudinal strength members 13c. The other members (inner shell 11, outer shell 15, foamed plastic 16) are
Arranged in the same manner as in the example.

Third Embodiment (FIG. 6): In FIG. 6, a birdcage-shaped frame structure 13 is constructed by bonding or welding a plurality of longitudinal strength members 13E and a plurality of circumferential strength members 13F. In addition, the longitudinal direction strength member 13E
A thin pipe, rod, wire, etc. is used for the circumferential strength member 13F.

Fourth Embodiment (FIG. 7): FIG. 7 shows a frame structure 13 having a torus structure. The torus structure referred to here is one in which each end of a large number of rods of approximately equal length is joined to another rod to form a triangular tetrahedron, and this tetrahedron is joined to another tetrahedron between each end. It is something. When such a torus structure is used, some of the rods have strength in the approximately longitudinal direction, and other rods have strength in the approximately circumferential direction, forming an extremely strong frame structure 13. .

〔Effect of the invention〕

In the present invention, the frame structure is constructed as described above by combining two small-sized strength members, and the back part is lined with foamed plastic that is resistant to compression. It is possible to provide a lightweight tank with similar heat insulation properties and high pressure resistance using a small amount of material compared to a tank.

Furthermore, since the strength members are assembled together, a large tank can be transported and assembled on site, making it possible to reduce costs.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a plan view of the longitudinal strength member, and FIG. 3 is a plane view of the circumferential strength member. 4 is a perspective view, FIG. 5 is a perspective view showing essential parts of a second embodiment of the present invention, and FIG. 6 is a perspective view showing a frame structure of a third embodiment of the present invention.
FIG. 7 is a cross-sectional view of a fourth embodiment of the present invention, and FIG. 8 is a vertical cross-sectional view showing the prior art. 11... Inner shell, 13... Frame structure, 13
A, 13G, 13E... Strength member in the substantially longitudinal direction,
13B, 130.13F... Strength member in substantially circumferential direction, 15... Outer shell, 16... Foamed plastic.

Claims (1)

[Claims] 1. A flexible sheet-like inner shell formed along a rotational surface around the longitudinal axis of an ellipse, a plurality of substantially circumferential strength members and a plurality of substantially longitudinal strength members are combined to form a three-dimensional structure. a rigid frame structure that surrounds the inner shell, and a flexible sheet-like outer shell that surrounds the frame structure, and a compartment defined by the frame structure between the inner and outer shells. A pressure-resistant and heat-insulating tank in which the space is filled with foamed plastic and the inner shell, frame structure, and outer shell are integrated.