Steel container for gases and method of its manufacture

 

(57) Abstract:

Use: treatment of metals by pressure. The inventive steel container has a body with a bottom and neck. In the body cavity of the established standard valves. On the transition area of the neck in the body has an internal flange at the bottom of the case - bearing shoulder. The size of the inner flange is determined by the dependencies. 2 S. p. f-crystals, 1 Il.

The invention relates to the processing of metals by pressure, and in particular to methods of manufacturing steel cylinders of small and average capacity for gas pressures up to 20 MPa (200 kgf/cm2), as well as designs seamless steel cylinders of small and average capacity.

Known methods of manufacture and design of steel cylinders (GOST 15860-85. The welded steel cylinders for liquefied petroleum gases at pressures up to 1.6 MPa) taken for the equivalent.

In this way the upper and lower heads are made of cold or hot stamping. If hot stamping was carried out at a temperature below 700aboutWith, the bottoms are subjected to heat treatment to relieve internal stresses. The upper plate is welded ring cap with outside the CA) welded sleeve with internal tapered threads W 27,8 (GOST 9909-81) under the brass fitting. The bottom plate is welded to the Shoe. Then both welded to the bottom cowling on a specially made slip rings mounted inside the cylinder under the welding seam. All parts of the container are made of sheet carbon steel of various grades, installed GOST 380-71, GOST 16523-70, GOST 19903-74, GOST 19904-74, GOST 1050-74. Special tests during incoming inspection for compliance with the criteria of the mechanical characteristics (andtoare all materials. In addition, testing of all welds and acceptance testing of welded cylinders.

The disadvantages of the known methods of manufacture of tanks (vessels) are: complexity and greater complexity of technological processes; the use of different materials; high consumption of ferrous and non-ferrous metals, electrodes, flux; the need to conduct multiple tests of metal, welded joints, and each cylinder individually, as well as works by highly experienced welder.

There are also known methods of manufacture and design of seamless steel cylinders. Steel cylinders for low and medium capacity for gases at Pp-20 MPa (200 kgf/cmthe housing office with wall thinning and intermediate chemical and thermal operations. Then the obtained seamless cylinder heats the upper part and the rollers on the Cam is formed neck. The inner and outer surfaces of the neck have a parabolic shape with respect to an axis of symmetry of the vessel. On the inner surface of the neck is cut a tapered thread W 27,8 (GOST 9909-81), which is screwed to a brass fitting. On the outside of the neck top is put on and welded to the chassis specially made ring having a wall thickness not less than 3.5 mm and the outer cylindrical pipe thread G 2 (GOST 6357-81), which is further wrapped around the cap that protects the nozzle from damage during transport (the weight of the ring is 0.3 kg and cap to 1.8 kg). The fitting is screwed into the neck of the container on the lead minium (GOST 1951-73), lead litharge (GSAT 5539-73) diluted natural drying oil (GOST 7931-76).

The tightness of the conical thread can be achieved by setting the outside diameter of the fitting under the flange copper sealing washers and tighten the fitting at the time of screwing (22040) N m

In the cavity of the fitting copper strip is placed, and on it is placed a copper membrane. After filling gas into the inside of the fitting is screwed on the cylindrical reshimu the bottom of the fitting.

After extraction operations with thinning of the wall of the bottom container has a somewhat convex shape and the container is not installed securely in a vertical position. To provide vertical stability to the container GOST standard 949-73, regulates the installation of a special Shoe, are embracing a segment of steel pipe welded to the cylinder with a gap between the supporting surface of the Shoe and the bottom of the tank not less than 10 mm

The disadvantages of the known methods of manufacture of tanks and their construction are: the weakening of the casing seamless cylinder with two seats welding (welding ring with thread and Shoe); increased consumption of black (Shoe, ring, cap) and nonferrous (copper sealing washer and brass fitting) metals, the complexity and cost in the manufacture of the Shoe, ring, cap o-rings and fitting, consumption of red lead, varnish, electrodes, flux; heating the upper part of the body for clearance openings in the hot state; loosening the brass fitting having a conical thread does not allow its reuse, screwed the new fitting; not enough reliable sealing of tapered threads; the need to test each cylinder to hermetically the tsya improving the reliability and reducing the consumption of metal.

This is achieved by the fact that on the transition area of the neck into the body of the container is made of the inner flange, and at the bottom of the case-bearing pile, while the profile of the internal cavity of the cap corresponds to the outer profile of the standard valves and associated with it, with copper sealing ring mounted on the inner flange, in addition, the size of the inner flange is determined by the dependencies:

h=(0,12-0,14)D;

Do=(0,14-0,16)D, where h is the thickness of the flange;

Dothe hole diameter of the neck at the site of the inner flange;

D is the outer diameter of the balloon.

When performing the extrusion is formed on the bottom of the case supporting the clamp, and after the execution mnogovershinnoe crimping deforming elements in the form of Cams on the transition area of the neck into the body of the cylinder radial compression form the inner flange, and then perform the additional step of machining the inner flange of the cylinder in a vertical position on its lower part is attached and welded piece of steel pipe (Shoe).

The design of the clamp on the bottom of the case during extrusion makes it unnecessary to use the shoes and welded, as by relying on the collar BA process, eliminates additional heating of the upper part of the seamless cylindrical body and forming the neck of the rollers. Local radial deformation of the metal Cams on the base of the neck in cold condition allows you to move the metal into the filler neck and to form the inner flange. In a further cavity of the mouth is treated in the size of the internal cavity of the brass fitting for the installation of standard valves, sealing the cavity of the cylinder pressing copper sealing ring to the inner flange of the neck. For reliable sealing width of the protruding part of the flange in the cavity after the bore must be at least (0,04.0,05)D, the diameter of the hole of the flange is made equal to (0,14.0,17).

Outside of the neck is threaded, the groove and the stop corresponding to the outer dimensions of the fitting. This eliminates the use of brass fittings, copper sealing washers, red lead, natural drying oil. No fitting does not need the use of protective caps and welded rings to the housing. To prevent dirt and dust from getting into the cavity of the cap on the neck is worn nylon cap.

The drawing shows the design offer owiny radial deformation of the metal Cams internal flange 3, after having bore diameter (0,14.0,17)D. the Distance H from the flange to the edge of the neck is the same size as the fitting on the ring band to the edge of the fitting. All dimensions of the internal cavity of the neck match the dimensions of the cavity of the fitting. The inner flange rests standard valves (copper sealing ring 4, the copper membrane 5, brass cracker 6 and brass clamping sleeve 7). Outside of the neck made the thread 8, the groove 8 and the stop 10, and the distance h from the stop to the edge of the neckline, as well as the dimensions of the grooves and thread fit, performed in fitting. Nylon cap 11 prevents the ingress of dirt and dust inside the neckline.

Before filling the tank with gas in the neck of the installed valves. After filling a special key is inserted in the groove 12 of the retainer sleeve 7 and so, screw it, seal the cavity of the container. Sealing is achieved by the fact that copper sealing ring 4 when the tightening sleeve 7 is removed on the inner flange 3 and securely locks the cavity.

If the width of the protruding part of the flange is greater (0,04.0,05)D, the shear ring is necessary to apply considerable force when tightening the nut. The fittings bottom vypolnenoe cylinder. Therefore, in the proposed structure after mechanical treatment of the neck and the flange at last leave the ring band width (0,04.0,05)D. Internal cavity of the cap has a diameter of 0.57 d, where d is the outer diameter of the neck, so the hole of the flange of the handle to the diameter of 0.14.0,17)D. the height of the Cams, which provide a radial-like metal for the formation of the inner flange, is chosen equal to (0,28.0,33)d. At smaller values in the deformation process is observed slice of metal. At larger sizes the height of the Cam increases the height of the neck.

After the radial deformation of the inner flange has a bore diameter of 0.12 D barrel-shaped height (0,19.0,21)D. In the machining height of the flange is reduced to (0,12.0,14)D. When the size >0,14 D the height of the flange increases the height of the neck, since the depth of the cavity to the flange must be of size N. When the thickness of <0,12 D flange need to calculate shear flange from the inner gas pressure. The height of the flange (0,12. 0,14)D is the best.

The design and implementation of the proposed method for the manufacture of cylinders for gases does not require large additional costs. Fashion and design can be used in inost design provides high quality seamless steel cylinders for gases.

1. Steel container for gases, comprising a housing with a bottom and neck, having a cavity, which is equipped with a standard stop valve, consisting of a copper sealing ring, copper membrane, brass cracker and brass clamping sleeve, characterized in that, in order to increase reliability and reduce consumption of metal, on the transition area of the neck into the body of the container is made of the inner flange, and at the bottom of the case supporting the clamp, while the profile of the internal cavity of the cap corresponds to the outer profile of the standard valves and associated with it, with copper sealing ring mounted on the inner flange, in addition, the size of the inner flange is determined by the dependencies

h (0,12 0,14)D

D0(0,14 0,17)D

where h is the thickness of the flange;

D0the hole diameter of the neck at the site of the inner flange;

D is the outer diameter of the balloon.

2. A method of manufacturing a steel container for gases, comprising operations of extrusion, mnogovershinnoe hood with wall reduction and mnogovershinnoe crimping, characterized in that, to reduce the consumption of metal and effort when performing the extrusion is formed on the bottom of the case of Aparecida neck into the body of the cylinder radial compression form an internal flange, then perform the additional step of machining the inner flange.

 

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