RU2194916C2 - High-pressure bottle and method of manufacture of such bottle - Google Patents

Abstract

FIELD: manufacture of high-pressure bottles for protracted storage and transportation of liquefied gases.

SUBSTANCE: proposed bottle has body made in form of tube with cover welded to its upper portion and high-rigidity bottom in its lower portion. Ends of tube projecting beyond cover and bottom have form of separate segments for contact with outer end face of cover and bottom; contact of radially formed ends of tube with end face of cover and bottom is intermittent. Method of manufacture of bottle includes locating and securing the cover and bottom and sealing the joints; first, cover and bottom are secured by intermittent welds and then intermittent forming of ends of tube projecting beyond cover and bottom is performed, after which joints are sealed by applying fillet welds and overlap welds.

EFFECT: enhanced reliability. 3 cl, 18 dwg

Description

The invention relates to the field of metal forming and can be used in the manufacture of high pressure cylinders for long-term storage and transportation of compressed and liquefied gases, mainly fire extinguishers.

A known design of the cylinder, including a glass with a neck, the edge of which is placed in the annular groove of the sleeve, and sealing the connection of the sleeve with the neck is carried out by soldering [1].

A disadvantage of the known design is the high accuracy requirements for the manufacturing process of the pressure vessel by cutting a groove in the sleeve, ensuring high accuracy of the neck formation process, the edge of which is placed in the annular groove of the sleeve. It is known that pressure vessels are thick-walled and require significant stamping efforts, and the higher the press power, the lower the manufacturing accuracy. At the same time, making a glass is a very time-consuming process, requiring a long time, money and powerful equipment.

Known high-pressure cylinder, including a glass with a neck, the inner surface of which is made in the form of a second-order surface, bonded to it by welding a sleeve, the side surface of which is made in the form of a second-order surface, and the part of the sleeve located inside the cylinder is provided with an annular thickening, in addition, the inner surface of the neck and the surface of the thickening on the sleeve in contact with the neck are made in the form of different or identical second-order surfaces, as well as de conic [2].

A disadvantage of the known design is the high requirements for the manufacture of the vessel as a whole and the increased complexity of the process of manufacturing the glass and sleeve, which significantly increases the complexity of manufacturing and the cost of the high-pressure cylinder.

A known method of manufacturing a pressure cylinder, including securing the sleeve in the former, forming a neck with the placement of the edge of the neck in the groove of the sleeve and sealing the joint with the sleeve by soldering [1].

The disadvantage of this method is that when placing the edge of the neck in the groove of the sleeve, it is necessary to ensure high precision in the manufacture of the sleeve, shaper and fastening of the sleeve to the shaper, or in the absence of such a requirement, a gap appears between the inner wall of the neck and the corresponding surface in the groove of the sleeve, thus, the soldering becomes at the same time a sealing and bearing element. In the latter case, the reliability of the high-pressure cylinder decreases during long-term storage of liquefied or compressed gas. It is known that pressure vessels are thick-walled and require significant stamping efforts, and the higher the press power, the lower the manufacturing accuracy.

A known method of manufacturing a high-pressure cylinder, including the orientation of the sleeve, forming the neck on the glass, fixing the sleeve in the neck, followed by sealing, first, the sleeve is oriented relative to the glass by placing inside the glass, and after the neck is formed, the sleeve is moved in the direction of the neck to the inside neck surface [2].

The disadvantage of this method is the high complexity of manufacturing a glass, consisting in numerous transitions with deep drawing and forming a profile of a thick-walled glass, the need to use a significant amount of technological equipment of high power and effort. In addition, high accuracy is required in obtaining conical surfaces in the manufacture of the neck and sleeve. All this increases the complexity of manufacturing and the cost of a high pressure cylinder.

The objective of the invention is to create a reliable technological design of a high-pressure cylinder and a less labor-intensive method for its manufacture by reducing the accuracy requirements for the geometric dimensions of the cylinder parts, reducing the number of pressure processing operations and technological equipment and using standard profile metal rolling in the manufacture of high-pressure cylinders in mass and mass production .

The problem is solved using the proposed design of a high-pressure cylinder containing a body in the form of a pipe, in the upper part of which a cover is fixed by welding, and in the lower part is a bottom of increased rigidity, while the ends of the pipe protruding above the cover and bottom inserted into the pipe are formed in the form of separate segments before welding and made with the possibility of contact with the outer end of the lid and the bottom, and the contact of the radially formed ends of the pipe with the ends of the lid and the bottom is intermittent.

Along with this, the problem is solved using the proposed method of manufacturing a high-pressure cylinder, including fixing and fastening the cap and bottom in the pipe, as well as sealing the joints, while first fixing is carried out inside the upper part of the pipe by an intermittent weld seam of the cap, and in the lower part of the pipe - bottoms, then radial discontinuous formation of pipe ends protruding above the cover and bottom inserted into the pipe in the form of separate segments in places where there is no fixing weld, and at the end seal joint formation by applying fillet welds in the unformed pipe ends, and lap welds in the formed ones.

The design features of the high pressure cylinder and the method of its manufacture are illustrated by drawings.

In Fig.1 shows a high pressure cylinder, a longitudinal section along aa in Fig.2; figure 2 is a top view along B in figure 1; figure 3 is a bottom view along In figure 1. Figure 4-18 shows the sequence of implementation of the method of manufacturing a high pressure cylinder, where figure 4 - the workpiece is a pipe; figure 5 - fixing the cap inside the upper part of the pipe intermittent weld; in Fig.6 is a top view along D in Fig.5; 7 is a radial discontinuous formation of the upper part of the pipe protruding above the lid; on Fig is a top view along D in Fig.7; in Fig.9 - sealing the junction of the pipe with the cap, a partial longitudinal section along EE in Fig.8; figure 10 is a top view along W in figure 9; figure 11 is a bottom of increased rigidity; on Fig - fixing the bottom inside the bottom of the pipe intermittent weld; in Fig.13 is a bottom view along And in Fig.12; on Fig - radial discontinuous formation of the lower part of the pipe protruding above the bottom; in Fig.15 is a bottom view along K in Fig.14; in Fig.16 - sealing the joint of the pipe with the bottom; in Fig.17 is a bottom view along A in Fig.16; on Fig - control of the finished product.

The high-pressure cylinder includes a housing 1 in the form of a pipe, in the upper part of which the cap 2 is fixed by welding, and the bottom 3 of increased rigidity is fixed by welding.

The ends 4 of the housing 1, protruding above the cover 2 and the bottom 3 inserted into the inside of the pipe, are formed in the form of separate segments before sealing welding and are made with the possibility of contact with the outer end of the cover 2 and the bottom 3, and the ends of the pipe 4 radially formed as separate segments 1 with the ends of the cover 2 and bottom 3 intermittent.

The radially formed ends 4 of the housing 1 in the form of bent segments alternate with the unformed ends 5 of the housing, while the lengths of the bent 4 and straight 5 segments are equal.

The tightness of the connection of the cover 2 and bottom 3 with the housing 1 is ensured by ring welds, and the tightness of the connection of the bent segments 4 of the housing with the ends of the cover 2 and the bottom 3 is ensured by an overlap 6 weld, and the tightness of the straight segments 5 of the housing with the cover 2 and the bottom 3 is angled 7 weld seam.

The conical threaded hole in the cover 2 is intended for mounting the valve (not shown in figure 1).

The operation of the high pressure cylinder is as follows.

The gas stored in the cylinder under high pressure through the cap 2 and the bottom 3 located inside the housing 1 acts on the radially formed bent segments 4 of the housing 1. Thus, the force element in the connection of the housing 1 with the cover 2 and the bottom 3 during operation of the cylinder are radially formed segments 4 of the housing 1, while the irregularities of the mating surfaces of the cover 2, the bottom 3 and the housing 1, gas can penetrate into the atmosphere. Sealing elements in the above joints are circular welds that change their appearance: lap 6 - for sealing bent segments 4 of the body with a cover and a bottom and corner 7 - for sealing straight segments 5 of the body with a cover and a bottom.

The proposed method of manufacturing a high-pressure cylinder includes fixing and fastening in the pipe billet 1 (Fig. 4) of the cover 2 and the bottom 3, as well as sealing the joints, while first fixing is carried out inside the upper part of the pipe 1 by intermittent welding seam 8 of the cover 2 (Fig. 5 and 6), and in the lower part of the pipe 1 - the bottom 3 (Fig.11-13), then the radial discontinuous formation of the ends 4 of the pipe 1, protruding above the inserted into the pipe 1 cover 2 (Fig.7 and 8) and the bottom 3 (Fig .14 and 15), in the form of separate segments in places where there is no fixing weld 8, and in to seal joints by applying fillet welds 7 in unformed ends 5 of pipe 1, and lap welds 6 in formed 4 (FIGS. 9 and 10, 16 and 17). Double application of welds: first fixing and then sealing in places of unformed segments 5, it allows to increase the strength and reliability of the joints of the body with the lid and the bottom.

The radial formation of the ends of the pipe 4 in the form of intermittent bent segments with the leaving of the straight segments 5 allows to reduce the complexity of the method of manufacturing the load-bearing elements of the container, reduce the accuracy requirements for the geometric dimensions of the parts of the container, reduce the number of operations and pressure processing forces, as well as technological equipment.

Example. A high pressure balloon P _slave = 22.5 MPa was manufactured. Name of the cylinder BVD-2000. Fire extinguisher brand - ОУ-2. Overall dimensions of the cylinder ⌀108 x 325 mm. The mass of the cylinder is 5.5 kg. The workpiece blank is a hot-rolled steel seamless pipe 108 x 5 GOST 8734 / B 20 GOST 8733) with a length of 325 mm. The cover was made according to the inner diameter of the pipe in the dimensions ⌀98 x 6 mm. The bottom was stamped into dimensions ⌀98 x16 mm from sheet metal 6 mm thick.

8.Initially, inside the upper part of the pipe, the cover was fixed with an intermittent weld according to GOST 14771-T1-MP, the length of the seam was 25 mm, the distance between the seams was 25 mm. In total, 6 welds were applied around the circumference (see FIGS. 5 and 6). Then, the upper end of the pipe protruding above the cover was formed in the form of six separate segments 25 mm long in the places between the welds, the distance between the segments was 25 mm (see Figs. 7 and 8). At the end, the connection between the lid and the body was sealed by applying lap welds in the places of the formed bent segments and fillet welds in other places (see Figs. 9 and 10) according to GOST 14771-U2-MP 135-

8.

8.The connection of the bottom with the lower end of the pipe was carried out similarly. Initially, the bottom was fixed inside the bottom of the pipe with an intermittent weld according to GOST 14771-T1-MP, the length of the seam was 25 mm, the distance between the seams was 25 mm. In total, 6 welds were applied around the circumference (see Figs. 12 and 13). Then, the lower end of the pipe protruding above the bottom was formed in the form of six separate segments 25 mm long in the places between the welds, the distance between the segments was 25 mm (see Figs. 14 and 15). At the end, the connection of the bottom to the body was sealed by applying lap welds in the places of the formed bent segments and fillet welds in other places (see Fig. 16 and 17) according to GOST 14771-U2-MP135-

8.

The implemented method of manufacturing a high-pressure cylinder BVD-2000 allowed to reduce the requirements for manufacturing accuracy, reduce the number of defects and reduce the complexity of manufacturing 2.4 times in comparison with the prototype [2].

The proposed manufacturing method and design of the high-pressure cylinder make it possible to increase reliability, durability and manufacturability, reduce the requirements for manufacturing accuracy, reduce the number of operations and technological equipment and use standard rolled metal in the manufacture of high-pressure cylinders in mass and mass production, reduce the complexity of manufacturing and control, reduce material costs without compromising product quality.

Sources of information

1. US patent 2405201, Ncl. 29-422, publ. 08/06/16.

2. Utility model PO 12209 01. Pressure tank. Fedulov S.A., 16.12.99 - prototype

Claims (2)

1. A high-pressure cylinder containing a housing made in the form of a pipe, in the upper part of which a cap is fixed by welding, and in the lower part is a bottom of increased rigidity, characterized in that the pipe ends protruding above the cap and bottom inserted into the pipe are formed in the form of separate segments before welding and made with the possibility of contact with the outer end of the lid and the bottom, and the contact of the radially formed ends of the pipe with the ends of the lid and the bottom is intermittent. 2. A method of manufacturing a high-pressure cylinder according to claim 1, including fixing and fastening the cap and bottom in the pipe, as well as sealing the joints, characterized in that first they fix inside the upper part of the pipe with an intermittent weld seam of the cap, and at the bottom of the pipe - the bottom , then the radial discontinuous formation of the pipe ends protruding above the lid and the bottom inserted into the pipe, in the form of separate segments in places where there is no fixing weld, and at the end the joints are sealed by applying to unformed the ends of the pipe fillet welds, and in the formed - lap welds.

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