Balloon

 

(57) Abstract:

The invention relates to the structures of the combined cylinder pressure and can be used in the manufacture of lightweight cylinders for vehicles, aircraft, transportation of compressed gases. The objective of the invention is the improvement to the cylinder by improving connections shells with the heads, change the design and material of the outer shell, the optimization of the shell thickness and shell, create the necessary pre-stress, which improves its efficiency, increase capacity, reduce weight and its relation to volume, to simplify the manufacturing technology and reduce the cost. The container contains a steel shell and a spherical or cylindrical bottom, welded butt joint without reinforcement seams. Shell covered by a sheath, made in the form of annular coils of steel wire, the strength of which reaches 15 of the strengths of the shell. The shell thickness can reach 1.5 thickness of the shell. Cowling created tension compression to 0.5 rated voltage of the operating pressure. 1 C.p. f-crystals, 1 tab., 1 Il.

The invention relates to the structures of the combined cylinder pressure and can be used in slotscasinos cylinder of a seamless pipe, including cylindrical and bottom parts /"steel Cylinders for small and medium volumes of gases at the Pg19,6 MPa /200 kgf/cm2/. GOST standard 949-73/-similar. Difficulties manufacture of thin-walled pipes made of high-strength steels determine what these cylinders have a relatively large and uneven thickness of the cylindrical part. The bottom part of the cylinder made by sealing, optionally thickened unreasonably from the constructive point of view. This causes an increase in the mass of the container and its relation to the volume.

The known container, containing a sealed corrugated metal shell connected to an elliptical or spherical bottoms and covered by an outer shell made of composite material and fixed terminal stations to the bottoms using pressure and thrust rings /auth. the certificate of the USSR N 1601189, CL F 17 C 1/00/ prototype.

Lap-joints jackets with the bottoms are not strong enough, and it can occur the destruction of the tank, especially under cyclic loading. Due to the low modulus composite material is nedogruzhena shell under internal pressure and the shell shows Schlage steel but the formation of a shell of it is difficult, time-consuming and requires the use of scarce components.

Object of the invention is the improvement of the balloon by improving connections shells with the heads, change the design and material of the shell, the optimization of the thicknesses, creating the necessary pre-stress in the cylinder, which allows it to increase its efficiency, to increase the capacity of the V, to reduce the mass m and the metric m/V, to simplify manufacturing technology, reduce the cost.

This task is achieved in that in the container containing the metal shell connected with a spherical or elliptical bottoms and covered by the outer shell, steel body and base are welded butt joint without reinforcement seams, and the shell is made of a thickness not exceeding 1.5 thickness of shell, in the form of an annular coils of steel wire strength not less than the strength of the shell. More sophisticated is the cylinder strength of the wire which is 1.1 to 15.0 strength of cowling and cowling which the compressive stress of not more than 0,5 rated voltage of the operating pressure.

Butt-welded joints without acceleration /thickening/ seams have the I. This allows the manufacture of the body and base made of sheet steel, which is available in a much wider range of size and grade range, higher accuracy and strength than seamless pipe. The outer casing in the form of an annular coils of wire increases the shell in longitudinal section, and the equality of the moduli of elasticity of the steel shell and the wire provides uniform loading under the action of internal pressure, resulting in higher efficiency gain than in the prototype. Additional reinforcement occurs when a cowling of the preliminary compression stress in combination with a stronger wire. This allows you to increase the operating pressure, the capacity of the tank, to reduce the wall thickness, the weight, the ratio of mass to volume m/V.

The manufacture of the shell of the wire easier than from a composite material, and the container can be made of relatively inexpensive non-deficient steel, which provides a reduction of 1.4-1.7 times the cost compared to the prototype.

A synergistic effect of the shell increases with its thickness. When tight fit for each other turns of wire sheath ICICI, the wire and the bottoms. Given the looseness of fit of turns of wire, which may reach 10-15%, the maximum shell thickness will be 1.5 thickness of the shell. Further increase in the shell thickness is excessive, because the tension in longitudinal section becomes lower than that in the cross section and the bottoms, the operability of the tank is almost not increased, and is only increasing its weight and cost. Running the shell of the wire, less strong than the shell, is not advisable due to the propensity to earlier destruction and the need for additional increase of the shell thickness. More durable wire increases the safety margin of the shell.

Preliminary compressive stresses in the shell created by the compression sheath. To compensate for the resulting tensile stresses in the wire strength must be increased in comparison with the strength of the shell 1.1 to 15.0 times. Below these values the strength of wire to use is not advisable due to overstress its work under pressure at an acceptable fluctuations in strength of 10%. The higher the ratio of strengths is not possible, because the maximum strength of the steel wires of the composition is compared to

Optimum design solution tank provides ravnomernost destruction of all sections under the action of internal pressure, which in first approximation is achieved by equality of factor of safety. Increase pre-compression stress causes an increase in the safety margin of the shell. The maximum compressive stress at which to achieve equality of the coefficients of the factor of safety shells /in transverse and longitudinal sections/, bottoms and wire is ~ 0,5 rated voltage of the operating pressure. Large compression impractical due to the undesirable reduction factor of safety wire below the factor of safety case and risk of premature failure envelope, followed by the shell.

The drawing shows the proposed tank. It comprises a sealed enclosure, consisting of a steel shell 1 and a spherical or elliptical heads 2. Welded or seamless shell is welded to the bottoms. Welded joint 3 is made butt without effort /thickening/ seams. Throughout the cylindrical portion of the body covered by a shell 4 of a thickness not exceeding 1.5 thickness of shell, in the form of an annular coils of steel wire, procn,0 the strength of the shell, in the past, it is advisable to create compressive stresses not exceeding 0,5 calculated tensile stress from the working pressure.

Under the action of the working of the internal pressure in the cylinder experiencing tensile stresses, which are usually in longitudinal section of the shell 1 is higher than in the cross section and the bottom 2. The shell 4, taking its share of the load, reduces the stresses in longitudinal section of the shell 1, especially with increasing thickness. In the cross section of the shell 4 is not experiencing loading and does not have a reinforcing impact on the cowling 1. Therefore, with increasing shell thickness to 1.3 thickness shells with tight fit to each other coils of wire or up to 1.5 of the thickness of the shell when the looseness of the fit of 10-15% in longitudinal section of the shell and the wire tension is compressed to its transverse cross section. With further increase of the thickness of the membrane voltage in longitudinal section of the shell and the wire becomes lower than that in the cross section and the bottoms, i.e. the latter is becoming weaker elements of the container and the shell thickness is excessive.

By applying internal pressure in the presence of the ring previously created the tension and internal pressure are summarized.

The table shows the different ways of cylinders under pressure up to 20 MPa with different values for theinpp/into, about/toandSG/p. Shell length 860 mm and the spherical bottom of the offered bottles are manufactured from sheet alloy and carbon steels. They are connected by TIG welding tungsten electrode butt without reinforcement seams. The cylindrical part of the cylinders other than the analogues of the var. 12, 13/ covered by membrane tension /var.1-5 and prototypes 10, 11/ tension /var.6-9/. Options 1, 2, 6-8 refers to the proposed design of cylinders, options 3-5, 9 are out-of-limit values of the structural parameters and voltages. Prototypes and analogs are shown for comparison.

The design of the bottle has a more rational use of materials /smaller the difference of the strengths and factors of safety margin in the various sections and parts. Therefore, thickness, mass and m/V of the proposed container several times less than similar. Compared with the prototype shell thickness and shell container of the proposed design is also less; the cost of these cylinders 1.4 - 1.7 times lower. Compression shell jacket, made in the form of collotype.

1. The container containing the metal shell connected with a spherical or elliptical bottoms and covered by the outer casing, characterized in that the steel shells and heads are welded butt joint without reinforcement seams, and the shell is made of a thickness not exceeding 1.5 thickness of shell, in the form of an annular coils of steel wire strength not less than the strength of the shells.

2. The cylinder p. 1, characterized in that the strength of the wire is 1.1 to 15.0 strength of the shell and the shell created the compressive stress of not more than 0,50 rated voltage of the operating pressure of the cylinder.

 

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