CN218468794U - Sealing structure and pressure-resistant non-repeated filling steel cylinder - Google Patents

Abstract

The utility model relates to the technical field of air pressure containers, and discloses a sealing structure and a pressure-resistant non-repeated filling steel cylinder, wherein the sealing structure comprises an upper bottle body and a lower bottle body, the lower end part of the upper bottle body is contracted inwards to form a transition section with the outer side surface being a round table surface and a cylinder section with the outer side surface being a cylindrical surface in sequence, the outer diameter of the cylinder section is the same as the inner diameter of the lower bottle body, the outer side wall of the cylinder section forms a first welding part, the inner wall of the upper end part of the lower bottle body forms a second welding part, and a welding layer made of copper is formed between the first welding part and the second welding part through brazing of a copper ring; the upper top surface of the upper bottle body is a mounting surface which is a plane, the mounting surface is connected with the upper bottle body through an arc transition section, a first mounting hole and a second mounting hole are formed in the mounting surface, the first mounting hole is used for mounting a main valve assembly, the second mounting hole is used for mounting a safety needle valve assembly, and the main valve assembly and the safety needle valve assembly are brazed with a first mounting hole and a second mounting hole copper ring respectively to form a welding layer made of copper.

Description

Sealed structure and pressure-resistant non-refillable steel cylinder

technical field

The utility model relates to the technical field of air pressure containers, in particular to a sealed structure and a pressure-resistant non-refillable steel cylinder.

Background technique

Current steel cylinders usually include an upper cylinder body and a lower cylinder body. The top of the upper cylinder body is usually used to arrange components such as valve components and valve retaining rings, and the bottom of the lower cylinder body is usually used to arrange components such as base retaining rings.

At present, the upper bottle body and the lower bottle body of the steel cylinder are usually connected by welding, and the welding point is the seam of the upper bottle body and the lower bottle body; Therefore, the requirements for the welding process are relatively high; in addition, in order to ensure the surface smoothness of the finished steel product, after the welding of the upper bottle body and the lower bottle body is completed, it needs to be polished, so the welding area (ie The thickness of the welding layer) is relatively thin, so it may affect the airtightness and compressive strength of the steel cylinder.

In order to ensure the pressure resistance of the current filling steel cylinder, the end faces of the upper cylinder and the lower cylinder are all constructed as circular arch surfaces (spherical surfaces); this arrangement will make the valve components (including the main valve) at the upper cylinder and safety needle valve) are not easy to install, and the lower bottle body is not easy to stand upright. In addition, the pressure of the circular arch surface (spherical surface) is relatively concentrated. In the prior art, there is also a design of setting the circular arch surface (spherical surface) as a plurality of small spherical surfaces spaced along the circumferential direction; considering the valve assembly The convenience of installation and the better pressure resistance inside the bottle body can set the upper top surface of the upper bottle body (that is, the installation surface for installing the valve assembly) as a plane, and set the lower bottom surface of the lower bottle body as the above-mentioned petal shape. However, one problem that has to be considered in the design of this type of petal shape is how to ensure the stability of the steel cylinder when it is placed vertically. Especially for non-refillable steel cylinders, it is difficult to design a better base structure because of the need to consider its manufacturing cost. Although there is a form in which the bottom of this petal shape is set as a plane in the prior art to ensure the stability when placed vertically; although the cost of this design can be better controlled, it destroys the overall force characteristics of the small spherical surface, Therefore, it will adversely affect the pressure resistance.

Utility model content

Aiming at the defects of poor airtightness and pressure resistance of steel cylinders in the prior art, the utility model provides a sealed structure and a pressure-resistant non-refillable steel cylinder. The utility model can realize the sealing and pressure resistance effect of the joint of the filled steel cylinder, so as to improve the production efficiency of the filled steel cylinder and reduce the production cost.

In order to solve the above technical problems, the utility model is solved through the following technical solutions:

The sealing structure includes an upper bottle body and a lower bottle body with the same diameter. The lower end of the upper bottle body shrinks toward the inner circumference in order to form a transition section with a circular table surface on the outer surface and a cylindrical section with a cylindrical surface on the outer surface. The outer diameter is the same as the inner diameter of the lower bottle body; the outer wall of the cylindrical section forms the first welded part, and the inner wall of the upper end of the lower bottle body forms the second welded part, and the first welded part and the second welded part are brazed through a copper ring Soldering forms a soldering layer made of copper.

In the utility model, the first welding part on the outer side wall of the lower end of the cylinder section of the upper bottle body is connected to the second welding part at the inner wall of the upper end part of the lower bottle body through copper ring brazing, and the connection part is closely fitted to form a copper joint. The welded layer not only increases the contact area between the first welded part and the second welded part, but also increases the thickness of the bottle wall at the joint, improving the tightness and pressure resistance of the steel cylinder.

Preferably, the length of the cylindrical section is 10mm, and the width of the welding layer formed by the first welding part and the second welding part is 3.2-6.0mm.

In the utility model, the interference welding of the first welding part and the second welding part is realized, the welding strength is increased, and the tightness and pressure resistance of the steel cylinder are improved.

As preferably, the upper top surface of the upper bottle body is a mounting surface, the mounting surface is a plane, the mounting surface is connected with the upper bottle body through a circular arc transition section, the mounting surface is provided with a first mounting hole and a second mounting hole, and the first mounting hole It is used for the installation of the main valve assembly, and the second installation hole is used for the installation of the safety needle valve assembly.

In the utility model, the installation surface of the top surface of the upper bottle body is flat to facilitate the installation of the main valve and the safety needle valve. When the cylinder is inflated, the arc transition section enables the steel cylinder to withstand greater pressure.

As preferably, the center of the bottle body installation surface is the first installation hole, the first installation hole is provided with the first installation hole wall perpendicular to the top surface of the upper bottle body and extending upward in the bottle body, the lower horizontal plane of the main valve assembly mounting seat and the upper bottle body The mounting surface of the body is bonded, and the copper ring brazing is used to form a copper welding layer in the middle. The outer wall of the main valve assembly mounting seat is bonded to the first installation hole wall, and the copper ring brazing is used to form a copper welding layer in the middle.

In the utility model, the hole wall of the first installation hole is perpendicular to the installation surface of the upper bottle body and fits with the outer wall of the main valve assembly installation seat, so that there are two contact surfaces between the main valve installation seat and the first installation hole, and the contact surfaces pass through Copper ring brazing forms a brazing layer made of copper, which improves the tightness and pressure resistance of the cylinder.

As a preference, the main valve assembly mounting hole has a hole wall length of 5 mm, the width of the welding layer between the lower plane of the main valve assembly mounting seat and the upper bottle body mounting surface is 4.2 mm, and the outer wall of the main valve assembly mounting seat and the upper bottle body center mounting hole wall The weld layer width is 5mm.

In the utility model, interference welding is performed between the lower horizontal surface of the main valve assembly mounting seat and the upper bottle body mounting surface, and between the outer wall of the main valve assembly mounting seat and the wall of the first mounting hole, which increases the welding strength and improves the sealing performance of the steel cylinder. Pressure resistance.

As a preference, the side of the center of the upper bottle mounting surface is a second mounting hole, and the second mounting hole is provided with a second mounting hole wall perpendicular to the top surface of the upper bottle body and extending upward into the bottle body. The horizontal surface is attached to the mounting surface of the upper bottle body, and a copper welding layer is formed by copper ring brazing in the middle. Copper solder layer.

In the utility model, the hole wall of the second installation hole is perpendicular to the installation surface of the upper bottle body and fits with the outer wall of the safety needle valve assembly mounting seat, so that there are two contact surfaces between the safety needle valve assembly seat and the second installation hole. The welding layer made of copper is formed by copper ring brazing between the steel cylinders, which improves the tightness and pressure resistance of the steel cylinder.

As a preference, the length of the wall of the second installation hole is 3 mm, the width of the welding layer between the lower horizontal surface of the safety needle valve assembly mounting seat and the upper bottle body mounting surface is 2.5 mm, and the outer wall of the safety needle valve assembly mounting seat and the side of the center of the upper bottle body 2. The width of the welding layer on the wall of the mounting hole is 3mm.

In the utility model, interference welding is performed between the lower horizontal surface of the safety needle valve assembly mounting seat and the upper bottle body mounting surface, and between the outer wall of the main valve assembly mounting seat and the first mounting hole wall, which increases the welding strength and improves the tightness of the steel cylinder and pressure resistance.

Preferably, after the upper bottle body and the lower bottle body are connected by brazing with copper rings, the outer wall of the upper bottle body and the outer wall of the lower bottle body are kept on the same vertical line.

In the utility model, by keeping the connection between the outer wall of the upper bottle body and the outer wall of the lower bottle body on the same vertical line, not only the thickness of the weld seam in the first connection area is increased, the tightness and pressure resistance of the steel cylinder are improved, and at the same time the The surface of the first connection area of the steel cylinder does not need to be polished, which reduces production costs.

The utility model also provides a pressure-resistant non-refillable steel cylinder, which includes any one of the above-mentioned sealing structures.

Description of drawings

Fig. 1 is a schematic diagram of a structural section of a pressure-resistant non-refillable steel cylinder in Example 1.

Fig. 2 is a partial schematic view of the lower bottle body in Example 2.

3 is a schematic diagram of a steel cylinder base in Example 2.

Fig. 4 is a schematic diagram of the bottom of the lower bottle in embodiment 2.

FIG. 5 is a schematic diagram of the first welding portion and the second welding portion in Embodiment 3. FIG.

FIG. 6 is a schematic diagram of the main valve mounting seat and the wall of the first mounting hole in Embodiment 1. FIG.

FIG. 7 is a schematic diagram of the safety needle valve installation seat and the second installation hole wall in Embodiment 1. FIG.

The names of the parts indicated by the numerals in the accompanying drawings are as follows:

110, lower bottle body; 120, base; 130, spherical protrusion; 140, safety needle valve assembly; 150, main valve assembly; 160, upper bottle body; 161, arc transition section; 162, first installation hole; 163 , the second mounting hole; 164, the mounting surface; 221, the first fitting part; 222, the second fitting part; 223, the third fitting part; 224, the supporting part; 225, the first fitting gap; 226, the second fitting gap ; 227, the first connecting portion; 228, the second connecting portion; 231, the first matching area; 232, the second matching area; 233, the third matching area; 321, the vertical annular portion; 322, the horizontal annular portion ; 323, annular support ring; 324, annular transition portion; 431, first area; 432, second area; 433, third area; 510, first welding portion; 520, second welding portion; 610, first installation Hole wall; 620, the outer wall of the main valve assembly mounting seat; 710, the second mounting hole wall: 720, the outer wall of the safety needle valve assembly mounting seat.

Detailed ways

In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only for explaining the present utility model rather than limiting it.

Example 1

As shown in Figures 1-7, this embodiment provides a pressure-resistant non-refillable steel cylinder, which includes an upper cylinder body 160, a main valve assembly 150, a safety needle valve assembly 140, a lower cylinder body 110 and a The base 120 at the lower bottle body 110 .

Wherein, a plurality of spherical protrusions 130 are formed at intervals along the circumferential direction on the bottom of the lower bottle body 110; therefore, the pressure resistance performance of the steel cylinder can be better improved.

In this embodiment, the top surface of the upper bottle body 160 is a mounting surface 164, and the mounting surface 164 is a plane. The mounting surface 164 is connected to the upper bottle body 160 through a circular arc transition section 161, and the mounting surface 164 is provided with a first mounting hole 162. And the second installation hole 163 , the first installation hole 162 is used for installing the main valve assembly 150 , and the second installation hole 163 is used for installing the safety needle valve assembly 140 .

Through the above, the installation surface of the top surface of the upper bottle body 160 is a plane, and when the main valve assembly 150 and the safety needle valve assembly 140 are installed, the contact surfaces of the main valve assembly 150 and the safety needle valve assembly 140 and the installation surface 164 are completely attached, It is more convenient to install the main valve assembly 150 and the safety needle valve assembly 140; the arc transition section 161 increases the pressure resistance of the cylinder.

In this embodiment, the center of the mounting surface 164 of the upper bottle body 160 is a first mounting hole 162, and the first mounting hole 162 is provided with a first mounting hole wall 610 perpendicular to the mounting surface 164 of the upper bottle body 160 and extending upward into the bottle body. The lower horizontal surface of the mounting seat of the main valve assembly 150 is bonded to the mounting surface 164 of the upper bottle body 160, and a copper welding layer is formed in the middle by copper ring brazing. The outer wall 620 of the mounting seat of the main valve assembly 150 is attached to the wall 610 of the first mounting hole. In the middle, a brazing layer made of copper is formed by copper ring brazing.

Through the above, the lower horizontal surface of the mounting seat of the main valve assembly 150 is attached to the mounting surface 164 of the upper bottle body 160, and the first mounting hole wall 610 is completely attached to the outer wall 620 of the mounting seat of the main valve assembly 150, which increases the distance between the main valve assembly 150 and the mounting surface 164 of the upper bottle body 160. The contact area of the mounting surface 164 of the upper bottle body 160 increases the mounting strength, and when gas is charged into the bottle, the steel cylinder can withstand greater pressure.

In this embodiment, the length of the first mounting hole wall 610 is 5 mm, the width of the welding layer between the lower plane of the mounting seat of the main valve assembly 150 and the mounting surface 164 of the upper bottle body 160 is 4.2 mm, and the outer wall 620 of the mounting seat of the main valve assembly 150 is in contact with the upper bottle body. The width of the welding layer of the first installation hole wall 610 of the body 160 is 5mm.

Through the above, the interference welding between the lower plane of the mounting seat of the main valve assembly 150 and the mounting surface 164 of the upper bottle body 160 and the outer wall 620 of the mounting seat of the main valve assembly 150 and the first mounting hole wall 610 of the upper bottle body 160 enhances the welding strength. When the cylinder is filled with gas, the cylinder can withstand greater pressure.

In this embodiment, there is a second installation hole 163 next to the center of the installation surface 164 of the upper bottle body 160, and the second installation hole 163 is provided with a second installation hole perpendicular to the installation surface 164 of the upper bottle body 160 and extending into the upper body of the bottle 160. Wall 710, the lower horizontal surface of the mounting seat of the safety needle valve assembly 140 is bonded to the mounting surface 164 of the upper bottle body 160, and a welding layer made of copper is formed by copper ring brazing in the middle. The outer wall 720 of the mounting seat of the safety needle valve assembly 150 is connected to the second mounting surface. The hole walls 710 are bonded together, and a brazing layer made of copper is formed in the middle by copper ring brazing.

Through the above, the lower horizontal surface of the mounting seat of the safety needle valve assembly 140 is attached to the mounting surface 164 of the upper bottle body 160, and the second mounting hole wall 710 is completely attached to the outer wall 720 of the mounting seat of the safety needle valve assembly 140, increasing the safety needle valve. The contact area between the component 140 and the installation surface 164 of the upper bottle body 160 increases the installation strength, and when gas is injected into the bottle, the steel cylinder can withstand greater pressure.

In this embodiment, the length of the wall of the second installation hole is 3 mm, the width of the welding layer between the lower horizontal surface of the safety needle valve assembly 140 mounting seat and the mounting surface 164 of the upper bottle body 160 is 2.5 mm, and the outer wall 720 of the safety needle valve assembly 140 mounting seat and the The width of the welding layer of the second installation hole wall 710 beside the center of the upper bottle body 160 is 3 mm.

Through the above, the interference welding between the lower plane of the mounting seat of the safety needle valve assembly 140 and the mounting surface 164 of the upper bottle body 160 and the outer wall 720 of the mounting seat of the safety needle valve assembly 140 and the second mounting hole wall 710 of the upper bottle body 160 strengthens the welding Strength, when the cylinder is filled with gas, the cylinder can withstand greater pressure.

Example 2

As shown in Figures 2-4, this embodiment provides a support assembly that can be used in Embodiment 1, which includes a lower bottle body 110 and a base 120 clamped at the lower bottle body 110, the lower bottle body 110 A plurality of spherical protrusions 130 are formed at intervals along the circumference of the bottom, and the spherical protrusions 130 have a first area 431, a second area 432 and a third area 433 sequentially formed between the side wall and the bottom wall of the lower bottle body 110;

The first area 431 is flush with the side wall of the lower bottle body 110 and the bottom end is higher than the bottom wall of the lower bottle body 110. The first area 431 of the plurality of spherical protrusions 130 together form the first matching area 231; the second area 432 From the bottom end of the first area 431, the center of the bottle body 110 is bent and the bottom end is lower than the bottom wall of the lower bottle body 110. The second area 432 of the plurality of spherical protrusions 130 together form the second matching area 232; the third area 433 is curved to connect the bottom end of the second area 432 and the bottom wall of the lower bottle body 110 , and the third areas 433 of the plurality of spherical protrusions 130 jointly form the third matching area 233 .

The base 120 has a first mating portion 221 for mating with the first mating area 231 , a second mating portion 222 for mating with the second mating area 232 , and a third mating portion 223 for mating with the third mating area 233 A support portion 224 is formed between the second matching portion 222 and the third matching portion 223 , and the first matching portion 221 , the second matching portion 222 , the third matching portion 223 and the supporting portion 224 are all annular.

Through the above, when the pressure inside the bottle increases, the spherical protrusion 130 can effectively change the pressure inside the bottle, preventing the bottle from deforming and malfunctioning. When the pressure continues to increase, the safety needle valve assembly 140 is used to release the pressure. A plurality of spherical projections 130 further improves the pressure resistance of the steel cylinder, and when the steel cylinder is placed vertically, the base 120 provided eliminates the need to ground the bottom of the steel cylinder, which reduces the manufacturing cost. The multiple matching parts on the bottom of the bottle body 110 enable the steel cylinder to be placed more stably.

In this embodiment, the first area 431 has the same width in the vertical direction, the width of the second area 432 gradually decreases in the direction away from the first area 431, and the width of the third area 433 in the direction away from the second area 432 The top gradually narrows, and the end of the third area 433 connected to the bottom wall of the lower bottle body 110 forms an arc.

Through the above, when the pressure on the bottom of the steel cylinder increases, the first area 431, the second area 432, and the third area 433 cooperate with each other, so that the pressure concentrated at the bottom of the bottle can be dispersed, thereby improving the pressure resistance of the steel cylinder sex.

In this embodiment, a first connecting portion 227 is formed at the top of the first matching portion 221 , and the first connecting portion 227 is used for matching with the side wall of the lower bottle body 110 .

Through the above, when the steel cylinder is placed on the base 120 , the first connecting portion 227 can effectively clamp the steel cylinder, so that the steel cylinder is clamped more firmly when placed.

In this embodiment, the support portion 224 has a vertical annular portion 321 and a horizontal annular portion 322 arranged between the second matching portion 222 and the third matching portion 223 in sequence, and the inner wall of the second matching portion 222 is used to fit the second matching portion 222. On the upper part of the second matching area 232 , the third matching portion 223 is curved from the horizontal ring portion 322 to the center of the bottle body 110 .

Through the above, the vertical ring portion 321 and the horizontal ring portion 322 preferably form a supporting structure, so that the steel cylinder can be stably supported.

In this embodiment, the supporting part 224 and the lower part of the second matching area 232 form a first matching gap 225, and the third matching part 223 and the third matching area 233 form an annular contact surface through tangency, and the first matching part 221 and the second A horizontal annular transition portion 324 is formed between the matching portions 222 , and a second matching gap 226 is formed between the annular transition portion 324 and the second matching area 232 .

Through the above, when the steel cylinder is placed on the base 120, the third matching part 223 is pressed downward by the pressure from the third matching area 233, and at this time, the supporting part 224 is driven by the force in the horizontal direction to drive the second matching part. 222 and the first fitting part 221 are pressed against the bottle body, so that the first connecting part 227 can hold the bottle body more firmly.

In this embodiment, at least one annular support ring 323 is formed in the first matching gap 225 , and the annular support ring 323 is used to support the lower part of the second matching area 232 .

Through the above, when the steel cylinder is placed vertically, the annular support ring 323 can effectively share the support force of the steel cylinder to the rest of the base 120, thereby providing better support.

In this embodiment, a second connecting portion 228 is formed inside the third matching portion 223 corresponding to the bottom wall of the lower bottle body 110 .

Through the above, when the third matching portion 223 is pressed toward the center under the pressure of the steel cylinder, the second connecting portion 228 can effectively resist the pressure from the third matching portion 223 , thereby ensuring the integrity of the base 120 .

The present embodiment provides a pressure-resistant non-refillable steel cylinder with a base. In actual use, the steel cylinder only needs to be placed on the base 120. When the pressure inside the cylinder increases, the spherical protrusion 130 can effectively Change the pressure inside the bottle body to prevent the bottle body from deforming outward. When the pressure continues to increase, the safety needle valve assembly 140 is used to release the pressure. At this time, the third matching part 223 of the base 120 will squeeze the support due to the force part 224, so as to promote the first connecting part 227 to clamp the bottle body more firmly. Since the steel cylinder is directly clamped on the base 120, the storage and transportation of the steel cylinder are also more convenient.

Example 3

As shown in FIG. 5 , this embodiment provides a sealing structure that can be used in Embodiment 1. Wherein, the lower end of the upper bottle body 160 shrinks to the inner circumference to form a transition section whose outer surface is a circular table surface and a cylindrical section whose outer surface is a cylindrical surface. The outer diameter of the cylindrical section is the same as the inner diameter of the lower bottle body; The outer side wall of the section forms a first welding portion 510, and the upper end inner wall of the lower bottle body 160 forms a second welding portion 520, and the first welding portion 510 and the second welding portion 520 are formed by brazing with a copper ring to form a welding of copper. layer.

Through the above, the upper bottle body 160 and the lower bottle body 110 are soldered to the copper ring of the first welding part 510 and the second welding part 520 to avoid air holes and slag inclusions and increase the contact surface and thickness of the joint. When gas is flushed into the cylinder, the cylinder can withstand greater pressure.

In this embodiment, the length of the cylindrical section is 10 mm, and the width of the welding layer formed by the first welding part 510 and the second welding part 520 is 3.2-6.0 mm.

Through the above, the interference welding between the first welding portion 510 and the second welding portion 520 enhances the welding strength, and when the gas is filled into the cylinder, the steel cylinder can withstand greater pressure.

In this embodiment, after the upper bottle body and the lower bottle body are connected, the outer wall of the upper bottle body and the outer wall of the lower bottle body are kept on the same vertical line.

Through the above, the outer wall of the upper bottle body 160 and the outer wall of the lower bottle body 110 are maintained on the same vertical line, the outer surface of the steel cylinder is kept smooth, no grinding is required, the production cost is reduced and the wall thickness of the steel cylinder is avoided. The tightness and pressure resistance of the cylinder are maintained.

The sealing structure and the pressure-resistant non-refillable steel cylinder provided in this embodiment, through the connection between the upper bottle body 160 and the lower bottle body 110, the connection method between the main valve assembly 150 and the mounting surface 164 of the upper bottle body 160, and the safety pin The connection method between the valve assembly 140 and the mounting surface 164 of the upper cylinder body 160 increases the contact area of each welding layer, thereby enhancing the tightness and pressure resistance of the steel cylinder.

In a word, the above descriptions are only preferred embodiments of the present utility model, and all equal changes and modifications made according to the patent scope of the utility model should fall within the scope of the utility model patent.

Claims (9)

1. The sealing structure is characterized in that: it includes an upper bottle body (160) and a lower bottle body (110) with the same diameter, and the lower end of the upper bottle body (160) shrinks toward the inner circumference in order to form a transition section whose outer surface is a circular table surface And the outer surface is the cylindrical section of cylindrical surface, and the external diameter of cylindrical section is identical with the inner diameter of lower bottle body (110); A second welding part (520) is formed on the inner wall of the upper end part, and a welding layer made of copper is formed by copper ring brazing between the first welding part (510) and the second welding part (520). 2. The sealing structure according to claim 1, characterized in that: the length of the cylindrical section is 10 mm, and the width of the weld layer formed by the first welding part (510) and the second welding part (520) is 3.2-6.0 mm. 3. The sealing structure according to claim 1, characterized in that: the top surface of the upper bottle body (160) is a mounting surface (164), the mounting surface (164) is a plane, and the mounting surface (164) is in contact with the upper bottle body (164). 160) are connected by a circular arc transition section, the installation surface (164) is provided with a first installation hole (162) and a second installation hole (163), the first installation hole (162) is used for the installation of the main valve assembly (150), The second installation hole (163) is used for installation of the safety needle valve assembly (140). 4. The sealing structure according to claim 3, characterized in that: the center of the mounting surface (164) of the upper bottle body (160) is a first mounting hole (162), and the first mounting hole (162) is provided with body (160) installation surface (164) and the first installation hole wall (610) extending in the upper bottle body (160), the lower horizontal surface of the main valve assembly (150) installation seat and the upper bottle body (160) installation surface (164 ) fit, and braze the copper ring in the middle to form a copper welding layer, the outer wall of the mounting seat of the main valve assembly (150) is bonded to the first installation hole wall (610), and braze the copper ring to form a copper brazing layer in the middle. the welding layer. 5. The sealing structure according to claim 4, characterized in that: the length of the first installation hole wall (610) is 5mm, and the lower plane of the main valve assembly (150) mounting seat is welded to the upper bottle body mounting surface (164) The width is 4.2mm, and the width of the welding layer between the outer wall of the mounting seat of the main valve assembly (150) and the first mounting hole wall (610) in the center of the upper bottle body (160) is 5mm. 6. The sealing structure according to claim 3, characterized in that: the center side of the upper bottle body (160) mounting surface (164) is a second mounting hole (163), and the second mounting hole (163) is provided with The mounting surface (164) of the upper bottle body (160) and the second mounting hole wall (710) extending into the upper bottle body (160), the lower horizontal surface of the safety needle valve assembly (140) mounting seat and the upper bottle body (160) are installed The surface (164) is bonded, and the middle is brazed with a copper ring to form a copper welding layer. The outer wall of the safety needle valve assembly (140) mounting seat is bonded to the second mounting hole wall (710), and the middle is brazed with a copper ring. A solder layer made of copper is formed. 7. The sealing structure according to claim 6, characterized in that: the length of the second installation hole wall (710) is 3mm, and the lower horizontal plane of the safety needle valve assembly (140) mounting seat and the upper bottle body (160) mounting surface ( 164) the welding layer width is 2.5mm, and the welding layer width of the safety needle valve assembly (140) mounting seat outer wall and the second mounting hole wall (710) on the side of the upper bottle body (160) center is 3mm. 8. The sealing structure according to claim 1, characterized in that: after the upper bottle (160) is connected with the lower bottle (110), the outer wall of the upper bottle (160) and the outer wall of the lower bottle (110) stay on the same vertical line. 9. A pressure-resistant non-refillable steel cylinder, characterized in that it includes an upper bottle body (160) and a lower bottle body (110), and claims 1-8 are set between the upper bottle body (160) and the lower bottle body (110) Any of the sealing structures described above.

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