High pressure cylinder

FIELD: gas-and-oil producing industry; natural gas industry; mechanical engineering; production and usage of the high-pressure cylinders.

SUBSTANCE: the invention is pertaining to the field of gas-and-oil producing industry, natural gas industry, mechanical engineering, in particular, to production and usage of the high-pressure cylinders. The high-pressure cylinders are intended for storage of liquids and gases. The high-pressure cylinder consists of a pressure sealing shell and an external load-bearing element. At that the pressure sealing shell is made out of the components connected to each other by a non-detachable connection and the field of the non-detachable connection of components of the pressure sealing shell is reinforced with an additional component. At that the additional component height H and length L are bound by the following ratio: L = H/tgα; where α is the angle of friction of the load-bearing component material on the additional component material. The technical result is an increased reliability of the high-pressure cylinder.

EFFECT: the invention ensures an increased reliability of the high-pressure cylinder.

6 cl, 2 dwg

 

The invention relates to mechanical engineering and can be used in the manufacture of high-pressure cylinders for the storage of liquids and gases, including gas cylinders for automotive vehicles and modules, fixed fire-fighting systems.

Known lightweight cylinders, allowing to reduce the weight of the cylinders through the use of more high-strength and lightweight materials consisting of thin-walled inner shell of the container, including the bottom with a neck and braid, and the outer surface of the composite materials reinforced with glass, carbon, etc.

The known high-pressure bladder (see the description of the patent of Russia 2049955, MKI6F 17 C 1/00, publ. BI No. 34, 10.12.95 g)consisting of the inner ring welded shell with bottom cap, at least one plate, and an outer reinforcing braid of variable thickness, while the inner shell is made of two polubarinov with equal geometrical parameters in the form of cups with the bottoms, which have a cylindrical portion cups are made relatively thin-walled bottoms with thinning in the direction of the axis of the cylinder and welded edges of the cups thickened inside of the container so that their outer diameter, at least less than the outer diameter thin-walled cylindrical part.

The disadvantage of this design is the construction of the container is irrational distribution of stresses in the material of the inner shell in areas of variable thickness on the cylindrical part, having a great influence on the reliability of the container under conditions of cyclic loading.

The problem solved by the invention is the design of a high-pressure bladder, providing operational reliability and optimization of weight and strength characteristics of the container.

The technical result achieved in the solution of the task is to minimise the mass of the cylinder by increasing cyclic strength.

This technical result is achieved in that in the cylinder of a high pressure, comprising a sealing membrane and the outer strength member, with the sealing sheath made of elements connected by a detachable connection, the area of permanent connection elements sealing membrane reinforced with an additional element, the height H and length L of the additional element connected by the relation:

L=H/tgα;

where α - the friction angle of the material of the power element material additional element.

In addition, the permanent connection of the parts of the sealing membrane can be made by welding or brazing.

Furthermore, an additional element, amplifying the region of permanent connection may be made in the form of rolling.

In addition, the outer strength member can be the is made of composite material, reinforced glass and/or carbon and/or aramid, and/or boron and/or polyamide, and/or asbestos, and/or gotovim, and/or cotton fiber, and elements of the sealing sheath made of steel or titanium alloy.

In addition, the outer strength member may be made circular and/or spiral, and/or polar, and/or the longitudinal-transverse and/or longitudinal cross-cross-winding.

To ensure the quality of the process of winding the outer braid and, as a consequence, the performance of the resulting composite in the zone of the weld pre superimposed annular PREROLL (figure 1).

The length L and height H of the winding connected by the relation:

L=N/a tgα;

where α - the friction angle of the material of the power element material additional element.

The friction angle α depends on the viscosity and the presence of binders, surface quality, the tension of the fiber material during the winding and is determined from the directory or by experiment.

The claimed container illustrated in the drawings, where figure 1 - the design of the high-pressure bladder; figure 2 - cross section area of permanent connection with amplifying element.

The high-pressure bladder includes sealing the casing 1 consisting of elements 2 connected by an all-in-one (in the example, welded or brazed) of the compound 3, while the last stage is reinforced by the PREROLL additional element 4 and the outer power element 5, which can be made circular and/or spiral, and/or polar winding of fiberglass, carbon fiber, etc.

The high-pressure bladder works as follows. After fabrication of the container sealing the shell 1 and the outer strength member 5 are tensioned, they have a residual voltage. In the external power unit 5 has a residual tensile stress, and sealing the shell 1 compressive residual. In the process of pumping gas in the cylinder, increasing the internal pressure, the compressive stress of the sealing shell 1 gradually drops to zero and become tensile at operating pressure. It is necessary that the following conditions exist: residual stresses in the material of the sealing shell 1 must be equal to the absolute value of the stresses resulting from loading of the cylinder working pressure (working pressure), i.e. the loading cycle should be symmetrical; working voltage must be less than the voltage characterizing the fatigue properties of the material, such as fatigue limit of the material of the sealing shell 1; working voltage arising in Matera the ale external power unit 5, must be less than the voltage characterizing the fatigue properties of the material, such as fatigue limit of the material of the latter. Feature of a composite material based on glass, carbon or other fibers is almost linear chart deformation until fracture. Compared to structural metallic materials behavior composite material is elastic. This enables the process of loading the cylinder internal pressure to achieve without destruction of the container such a busy condition when sealing the shell will enter a phase of plastic deformation. After pressure relief sealing sheath receiving permanent deformation will not be able to return to its original state, and the outer strength member made of composite material will tend to return to its original state, resulting in the sealing membrane will act compressive stresses.

The container is made as follows. Originally cut from a sheet blank and produce stamping to obtain the element of the container, and then carry out the welding elements and wariana neck, resulting in a gain inner sealing membrane of the balloon. In the next step of the process is a heat treatment is received in the shell to relieve stress arising during the welding process, and then produce the PREROLL field weld compliance with specified dimensions (L and N), then produce a solid, and/or spiral, and/or polar winding sealing the shell to the required thickness. After curing the binder to produce the loading cylinder calculated internal pressure to occur in the sealing membrane residual stresses. The last stage of the process are tested cylinder strength and tightness.

Thus, the use of the invention allows to produce plastic cylinders high pressure, providing maximum cyclic strength and minimum weight of the container.

1. Cylinder high pressure, comprising a sealing membrane and the outer strength member, with the sealing sheath made of elements connected by a detachable connection, characterized in that the area of permanent connection elements sealing membrane reinforced with an additional element, the height H and length L of the additional element connected by the relation:

L=H/tgα,

where α - the friction angle of the material of the power element material additional element.

2. The container according to claim 1, characterized in that the permanent connection of the parts of the sealing Obolo the key is made by welding.

3. The container according to claim 1, characterized in that the permanent connection of the parts of the sealing membrane is made by means of soldering.

4. The container according to claim 1, characterized in that the additional element, amplifying the region of permanent connection made in the form of rolling.

5. The container according to claim 1, characterized in that the outer strength member made of a composite material reinforced with glass and/or carbon and/or aramid, and/or boron and/or polyamide, and/or asbestos, and/or gotovim, and/or cotton fiber, and elements of the sealing sheath made of steel or titanium alloy.

6. The container according to any one of claims 1 to 5, characterized in that the outer strength member is made circular and/or spiral, and/or polar, and/or the longitudinal-transverse and/or longitudinal cross-cross-winding.



 

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