RU2215234C1 - High-pressure bottle and method of its manufacture - Google Patents

Abstract

FIELD: protracted storage and transportation of compressed and liquefied gases, mainly fire extinguishers. SUBSTANCE: proposed bottle has housing made in form of pipe with narrowing lower neck and profiled bottom welded to it and upper narrowing neck with bush located inside it; it is secured with neck by means of tube whose one end is screwed into bush and second end is welded to bottom. Method of manufacture of bottle includes forming of lower neck of housing, securing tube to bottom by means of circumferential weld seam followed by welding bottom with tube to lower neck of housing. Then, bush is secured in neck by screwing it on tube and sealing-up the joint by means of circumferential weld seam. EFFECT: enhanced reliability and durability; facilitated procedure. 3 cl, 11 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.

A 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 the 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 conical. [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 shaper, the formation of the 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 bore of the sleeve, it is necessary to ensure high accuracy 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 bore of the sleeve. Thus, soldering becomes both a sealing and a supporting 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 operations and technological equipment and using standard profile metal 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, which includes a housing made in the form of a pipe with a lower tapering neck and a profiled bottom welded to it and an upper tapering neck with a sleeve inside with a cylindrical surface fastened to the neck with a tube, one the end of which is screwed into the sleeve, and the second is welded to the bottom.

 In addition, the problem is solved using the proposed method of manufacturing a high-pressure cylinder, including mounting the tube to the bottom by applying an annular weld, subsequent welding of the bottom with the tube to the lower neck of the body. Then, after the formation of the upper neck of the body, it secures the sleeve by screwing it onto the tube, followed by sealing the joint by applying an annular weld.

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

 In FIG. 1 shows a design of a high pressure cylinder, longitudinal section. Figure 2-11 shows the sequence of implementation of the method of manufacturing a high pressure cylinder, where figure 2 is a segment of a pipe billet; figure 3 - the formation of the lower neck; figure 4 - cutting and the formation of a profiled bottom; in Fig.5-6 - the manufacture of the tube; Fig.7 - welding of the tube to the profiled bottom; on Fig - fixing the bottom with the tube in the lower neck and applying at the junction of a sealing annular weld; figure 9 - the formation of the upper neck; figure 10 - manufacture of a cylindrical sleeve with a shoulder; figure 11 - fixing the sleeve in the upper neck by screwing it onto the tube and applying a sealing ring weld.

 The high-pressure cylinder includes a pipe 1 with a lower 2 and upper 3 necks, a sleeve 4, a pipe 5 with an opening 7 for a gas outlet and a profiled bottom 6.

 The sleeve 4 with a cylindrical outer surface is fastened to the upper neck 3 by means of a tube 5, one end of which is screwed into the sleeve, and the other is welded to the bottom 6 with an annular weld seam 8.

 The tightness of the connection of the upper neck 3 with the sleeve 4 is provided by an annular weld seam 10.

 The tightness of the connections of the lower neck 2, pipe 1 with the bottom 6 is provided by an annular weld 9.

 The conical threaded hole 11 in the sleeve 4 is intended for mounting a fan, which is 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 sleeve 4 located inside the upper neck 3 of the cylinder acts on the tube 5, fastening the sleeve 4 with the bottom 6. Thus, the power element in the connection of the sleeve 4 with the upper neck 3 of the pipe 1 during operation of the cylinder is a tube 5, while due to the irregularities of the mating surfaces of the sleeve 4 and the upper neck 3, gas can penetrate into the atmosphere. The sealing element in the above connection is an annular weld 10.

 In the connection of the lower neck 2 with the bottom 6, the power element that receives high gas pressure is the lower neck 2 of the pipe 1, and the sealing element is an annular weld 9.

 The gas outlet from the cylinder is carried out through the tube 5 through the hole in it 7.

 The proposed method of manufacturing high pressure cylinders includes the formation of the lower 2 and upper 3 necks of the pipe 1, which is carried out by cold deformation from a large diameter to a smaller one.

 After the formation of the lower neck 2, which, according to the proposed technological process, is manufactured first, a bottom 6 is placed in it with a pipe 5 welded to it and fixed in the lower neck by applying a sealing ring weld 9 at the junction (Fig. 7, 8).

 The bottom 6 is stamped with a profile to give greater rigidity in order to protect the bottom from deflection under the action of high pressure of the gas in the cylinder. Then, after the formation of the upper neck 3 (Fig. 9), the sleeve 4 is fastened in it (Fig. 11), screwing onto the tube 5 and sealing the joint of the sleeve with the neck by applying an annular weld 10.

 The sleeve 4 (figure 10) is made cylindrical and has a shoulder for fixing at the end of the upper neck 3.

 Example. A high pressure balloon P slave. = 22.5 MPa was manufactured. Name of the cylinder BVD-2000. Fire extinguisher brand OU-2. Overall dimensions of the cylinder F 108x325.

6.The mass of the balloon is 4.1 kg. The formation of the lower neck of the pipe (seamless hot-rolled steel pipe 108x5 GOST 8734 / B 20 8733) was carried out at a length of 35 mm to F 65 mm. The bottom was stamped in the size of F 79x16 mm from sheet metal 6 mm thick. The connection of the bottom with the lower neck of the pipe was carried out by applying at the junction of the sealing ring weld GOST 14771 - U 2 - UP

6.

 The formation of the upper neck of the pipe was carried out at a length of 122 mm to f 58 mm. The sleeve was made of hot-rolled round steel B60 GOST 2590-88 / 20 GOST 1050-88 in the amount of F58x50 mm.

4, до упора буртом в торец горловины.The sleeve was connected to the upper neck of the pipe by screwing it onto a 1/2 '' pipe, welded with the second end to the bottom with a ring weld GOST 14771-76- T1-UP

4, all the way to the shoulder in the end of the neck.

6.Sealing of the sleeve with the upper neck of the pipe was carried out by applying at the junction of the sealing ring weld GOST 14771-U4 - UP

6.

 Implementation of the proposed design of the high pressure cylinder BVD-2000 and the method of its manufacture can reduce the requirements for precision manufacturing of the BVD, reduce the amount of marriage and reduce the complexity of its manufacture.

 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 in the manufacture of high-pressure cylinders in mass and mass production.

Literature
1. US patent 2405201, Ncl. 29-422, publ. 08/06/46.

 2. RF patent 2153127 C1, MKI F 17 C 1/00, B 21 D 51/24. High pressure cylinder and method for its manufacture. Fedulov S.A. Application 98120574/12, declared 11.16.98, publ. July 20, 2000 Bull. 20 is a prototype.

Claims (2)

 1. A high-pressure cylinder, comprising a housing, which is made in the form of a pipe with a lower tapering neck and a profiled bottom welded to it and an upper tapering neck with a sleeve with a cylindrical surface inside it, characterized in that the sleeve is fastened with a neck, one end of which is screwed into the sleeve, and the other is welded to the bottom.  2. A method of manufacturing a high-pressure cylinder, including attaching the tube to the bottom by applying an annular weld, subsequent welding of the bottom with the tube to the lower neck of the body, characterized in that after the formation of the upper neck of the body, the sleeve is fastened by screwing it onto the tube and sealing joint by applying an annular weld.

Images