NPO Poisk

Metal cylinders for cryogenic technology. Cylinders of small capacity with organic-plastic solid shell for small thermal imaging devices. BG-0 ,4 BG-35-0 ,75-43.

High pressure is widely used in cryogenic technology to cool the various devices, including night vision devices. These cylinders are requirements on maximum working volume with limited dimensions, minimum weight is not charged cylinder and high resource on the number of refills working environment.

Currently, the cryogenic technology used metal cylinders made of titanium alloys. The disadvantage of these cylinders is a large mass and high complexity in their manufacture. The use of metal containers instead of metal allows you to reduce weight while maintaining the capacity of the cylinder.

The design of metal-metal inner container includes a sealed envelope - liner and external power plastic wrap, formed by filament winding of high-modulus fibers (carbon fiber, fiberglass or organic fibers) impregnated with binder. Typical liner design consists of a cylindrical middle part (shell) and welded to her two heads, one of which is welded fitting. The thickness of shells and heads of 0,3-0,5 mm. Connection shell with a bottom made by welding a bed-rings that ensure the quality of the weld due to fixation of shell and heads for draw-ring during welding. Operating pressure in cylinders of cryogenic equipment is 35 - 43 MPa. Deformation of metal-plastic shells of the container when the pressure reaches such high values and may exceed the limit of elastic deformation of the material liner. Elastoplastic deformation of liner material arising from the filling of the container work environment, limited resource of safe operation of the container. The weakest point are the welds and adjacent zones of welded joints Leiner. Increase the reliability of the cylinder can be due to reduced number of welds in the construction liner, or by arranging welds in the areas of least deformation of the material liner.

NPO "SEARCH" "performs work on the creation of metal cylinders cryogenic technology, designed for working pressure of 35 MPa and 43 MPa, the volume of cylinders respectively 0,35 l and 0,75.

In the design of the container volume 0,35 l, with a view to reducing the number of welds, of design liner, in which the bottom and fitting are integral part. Similarly, perform the second bottom in the central part of which there is thickening, used for transmission of torque at winding durable tow. The design of both components provides welding with shell without draw-rings. The thickness of the parts on the main part of the bottoms of 0.5 mm at the peripheral part of the bottoms, intended to connect and weld with a shell thickness of 1.5 mm parts. Outer diameter of liner 48 mm; liner material parts - corrosion-resistant steel 12X18H10T (Figure 1). Photo of the cylinder capacity of 0.25 liters with a working pressure of 35 MPa is shown in Figure 2.

Fig.1 ; ; ; , Fig. 2

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design of metal-liner cylinder volume 0,75 l represents two bottoms, cooked without the use of draw-rings. In one of the ends welded fitting. Due to the deep-drawing in the manufacture of bottoms do not need to use shell and reduce the number of welds. Outer diameter of liner 110 mm; liner material parts - corrosion-resistant steel 12X18H10T. Photograph and drawing of the container with a capacity of 0.75 liters with a working pressure of 43 MPa are presented in Figure 3. and in Figure 4.

Fig.3 ; ; ; ; ; , Fig. 4

Specifications cylinder BG-0 ,75-44 and TU 1411-019-03455343-06 cylinder OBD-0 35-35 are shown in the table.

Parameter setting for cylinders
BG-0 ,75-43 OBD-0 ,35-35
nominal capacity, l 0,75 0,35
outer diameter, mm 124 1952
length of the cylinder, mm 149,5 256
Weight, kg 0,7 0,225
Connecting thread M16h1, 5 M16h1, 5
Operating pressure, MPa (kgf/cm2) 43,1 (440) 35 (357)
Pressure test during hydraulic testing, MPa (kgf/cm2) 53,9 (550) 49 (500)
pressure in the pneumatic testing for leaks, MPa (kgf/cm2) 43,1 (440) 49 (500)
Minimum pressure fracture, MPa (kgf/cm2) 103,4 (1056) 84 (857)
Operating Temperature from minus 65 to plus 70 from minus 50 to plus 50
Work environment nitrogen, air nitrogen, air
designated lifetime, years (including the working pressure, age) 20 (15) 6 (5)
number of cycles of charging 3000  1960