RU2488494C1 - Sandwich ball shell - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used in space and aircraft engineering, chemical industry, etc. Proposed shell consists of spaced apart concentric inner and outer ball shells 1, 2 interconnected by three ball shells 3, 4, 5 arranged in space between shells 1, 2. Mid ball shell 3 covers shell 2 so that its mid spherical layer dividing shell 3 over thickness into halves contacts mid spherical layers of shell 1, 2 in diametrically opposite points. Second ball shell 4 is arranged in space between shells 3, 4 so the its mid spherical layer contacts mid spherical layers of shells 3, 4 the their contact points. Third ball shell 5 is arranged in space between shells 3, 1 so the its mid spherical layer contacts mid spherical layers of shells 3, 1 the their contact points.

EFFECT: higher stiffness and strength, expended applications.

3 cl, 2 dwg

Description

The invention relates to the field of engineering and can be used in its various industries, such as space, aviation and chemical engineering.

Multilayer spherical shells are used in those cases when it is required to provide increased rigidity and minimal weight of the structure. These are aircraft fuel tanks, tanks and storage tanks for chemicals, etc.

Among the multilayer power structures, a special place is occupied by three-layer shells. The design of a three-layer spherical shell is given in the book of N.A. Altufieva et al. “Calculation of multilayer plates and shells made of composite materials”. M .: Engineering, 1984, and adopted as a prototype. This three-layer shell is formed by two spatially spaced, concentrically located outer and inner spherical shells, the space between which is filled with filler. Foam, cellular filler made of metal foil, corrugations, etc., are used as a filler. Most often, the filler is glued to the surfaces of the outer and inner shells.

The specified technical solution has the following disadvantages:

- the weak point of this multilayer structure, which is primarily manifested in the process of deformation of the multilayer shell, is the boundary between the filler material and the outer and inner shells;

- Another drawback of the design is that the connection of spatially spaced outer and inner spherical shells is carried out through the filler, so when loading these parts of a single structure are deformed asynchronously.

These shortcomings of the multilayer construction are noted in the book by E.I. Grigolyuk and G.M. Kulikova “Multilayer reinforced shells. Calculation of pneumatic tires. " M .: Engineering, 1988.

The objective of the invention is the creation of a multilayer spherical shell, which should not have the above-mentioned disadvantages, while maintaining the advantages of multilayer shells: high rigidity and strength with a minimum weight of the structure.

This is achieved by the fact that the spatially spaced, concentrically located outer and inner spherical shells that are part of the multilayer spherical shell are interconnected using three interconnected spherical shells that are located in the cavity between the outer and inner spherical shells so that the middle spherical shell covers the inner spherical shell in such a way that the middle spherical layer of the middle spherical shell dividing the spherical shell in half in thickness touches the middle spheres ble layers of the outer and inner spherical shell at diametrically opposite points; the second spherical shell is placed so that its middle spherical layer touches the middle spherical layers of the inner and middle spherical shells at the point of contact; the third spherical shell is placed so that its median spherical layer touches the median spherical layers of the outer and middle spherical shells at the point of contact. Optimization of the technical parameters of the multilayer spherical shell is achieved by the fact that the radius of the middle spherical layer of the second ball shell has a value equal to the geometric mean of the radii of the middle spherical layers of the inner and middle spherical shells; the radius of the middle spherical layer of the third spherical shell has a value equal to the geometric mean of the radii of the middle spherical layers of the outer and middle spherical shells.

An increase in the strength characteristics of the multilayer spherical shell is achieved by the fact that the cavities enclosed between the outer and third, third and middle, middle and second, second and inner spherical shells are filled with a filler.

The essence of the device is illustrated by drawings.

Figure 1 shows a cross section of a multilayer ball shell.

Figure 2 shows a three-dimensional image of a bisected multilayer spherical shell.

The design includes five interconnected spherical shells, with each of the five shells consisting of two parts. Two spatially spaced, concentrically located spherical shells - the outer spherical shell 1 and the inner spherical shell 2 - have a common center at point O. In the cavity between the spherical shells 1 and 2 there are three interconnected spherical shells. The middle spherical shell 3 connects the outer spherical shell 1 and the inner spherical shell 2 to each other so that the median spherical layer of the shell 3 touches the median spherical layers of the shells 1 and 2 at two diametrically opposite points. In the cavity between the inner spherical shell 2 and the middle spherical shell 3, the spherical shell 4 is placed so that its median spherical layer touches the median spherical layers of the spherical shells 2 and 3 at the point of contact. In the cavity between the outer spherical shell 1 and the middle spherical shell 3, a spherical shell 5 is placed so that its median spherical layer touches the median spherical layers of the spherical shells 1 and 3 at the point of contact.

The proposed device is an implementation of a very specific mathematical principle, therefore it has unique mechanical properties, while being very technological. High adaptability to minimize the cost of implementing the proposed technical solution. Its implementation can significantly expand the scope of multilayer shells.

Information sources

1. N.A. Altufiev et al. “Calculation of multilayer plates and shells made of composite materials”. M .: Mechanical Engineering, 1984.

2 E.I. Grigolyuk and G.M. Kulikov “Multilayer reinforced shells. Calculation of pneumatic tires. " M .: Engineering, 1988.

Claims (3)

1. The device in the form of a multilayer spherical shell, consisting of interconnected, spatially spaced, concentrically arranged, consisting of two parts of the outer and inner spherical shells, characterized in that the connection of the outer and inner spherical shells is carried out using three interconnected, consisting of each of two parts of spherical shells, which are placed in the cavity between the outer and inner spherical shells so that the middle spherical shell covers the inner spherical shell a point in such a way that the middle spherical layer of the middle spherical shell dividing the spherical shell in half in thickness touches the middle spherical layers of the outer and inner spherical shells at diametrically opposite points; the second spherical shell is located in the cavity between the middle and inner spherical shells so that its median spherical layer touches the median spherical layers of the middle and inner spherical shells at the point of contact; the third spherical shell is located in the cavity between the middle and outer spherical shells so that its median spherical layer touches the median spherical layers of the middle and outer spherical shells at the point of contact. 2. The device according to claim 1, characterized in that the radius of the middle spherical layer of the second spherical shell has a value equal to the geometric mean of the radii of the middle spherical layers of the inner and middle spherical shells; the radius of the middle spherical layer of the third spherical shell has a value equal to the geometric mean of the radii of the middle spherical layers of the outer and middle spherical shells. 3. The device according to any one of claims 1 and 2, characterized in that the cavities enclosed between the outer and third, third and middle, middle and second, second and inner spherical shells are filled with a filler.

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