Coil sleeving method for vertical welded heat-insulating gas cylinder and welded heat-insulating gas cylinder

Abstract

The invention relates to the technical field of welded heat-insulation gas cylinders, in particular to a vertical welded heat-insulation gas cylinder coil pipe sleeving method and a welded heat-insulation gas cylinder. The vertical welded heat-insulation gas cylinder coil pipe sleeving method comprises the steps that a shell plate is provided with a groove according to the size requirement after a reel pipe is formed; the shell plate is rolled and formed and welded into a shell cylinder; the vaporization coil pipe is rolled and formed; the vaporization coil pipe is spirally arranged in the shell cylinder along the groove; after the shell cylinder and the vaporization coil pipe are naturally cooled to the room temperature, welding and fixing are conducted; and the gas cylinder inner container is sleeved. Sleeving welding of the vaporization coil pipe and the shell cylinder is easier, and the precision requirement for coiling forming of the vaporization coil pipe can be lowered. In addition, under the same water volume, the gap between the inner container of the gas cylinder and the shell cylinder is smaller, and the outer diameter of the gas cylinder is smaller.

Description

Technical Field

[0001] The invention relates to the technical field of welded insulated gas cylinders, and in particular to a vertical welded insulated gas cylinder coil assembly method and a welded insulated gas cylinder. Background Art

[0002] Welded insulated gas cylinders are a type of fixed low-temperature insulated gas cylinders, which are widely used in the storage and use of industrial gases represented by oxygen, nitrogen, argon and liquefied natural gas. Common structures of welded insulated gas cylinders are as follows: Figure 3 As shown, it is composed of a gas cylinder liner, an outer shell, a vaporizing coil, pipeline accessories 8, a header 7 and other accessories. The gas cylinder liner includes a cylinder part and a neck tube 6 at the top of the cylinder part. The vaporizing coil is a spiral upward pipeline around the gas cylinder liner, which is mainly used to vaporize and discharge the liquid contained in it. Its main structure is as follows Figure 4 As shown, the installation method of the welded insulated gas cylinder is generally: press the vaporizer coil into the outer shell, weld the vaporizer coil to the inner wall of the outer shell, and after welding, assemble it with the inner liner of the gas cylinder. This installation method has the following problems: the precision of the vaporizer coil rolling is high. If the precision is not enough, it may be difficult to press the vaporizer coil into the outer shell, or there may be a gap between the vaporizer coil and the inner wall of the outer shell, resulting in a large stress on the welding point, which cannot meet the requirements of the vibration test. Summary of the invention

[0003] The purpose of the present invention is to address the defects of the prior art and provide a vertical welded insulated gas cylinder coil assembly method and a welded insulated gas cylinder, which makes it easier to weld the vaporizer coil and the outer shell cylinder, and can relax the precision requirements for the vaporizer coil rolling. In addition, under the same water volume, the gap between the gas cylinder liner and the outer shell cylinder is smaller, and the outer diameter of the gas cylinder is smaller.

[0004] In order to solve the above technical problems, in a first aspect, the present invention provides a method for vertically welding insulated gas cylinder coils, comprising:

[0005] The outer shell sheet is grooved according to the size requirements after the tube is rolled;

[0006] Rolling the shell sheet into shape and welding it into a shell cylinder;

[0007] Rolling the vaporizing coil into shape;

[0008] The vaporizing coil is spirally installed into the outer shell along the groove;

[0009] Wait for the outer shell and the vaporizing coil to cool naturally to room temperature before welding and fixing;

[0010] Put the gas cylinder liner into the suit.

[0011] In some embodiments, the groove is formed in the following manner: when the thickness of the shell sheet is less than or equal to 3.5 mm, the groove depth is 0.5 mm; and when the thickness of the shell sheet is greater than 3.5 mm, the groove depth is 1 mm.

[0012] Furthermore, the groove is formed in the following manner: when the shell sheet thickness is less than or equal to 3.5 mm, the bottom of the groove is arc-shaped, and the deepest depth is 0.5 mm; when the shell sheet thickness is greater than 3.5 mm, the bottom of the groove is flat.

[0013] In some embodiments, before the vaporizing coil is spirally installed into the outer shell along the groove, the outer shell is heated in a water bath.

[0014] Furthermore, the outer shell cylinder is heated to 75° C. in a water bath.

[0015] In some embodiments, the requirements for the coiling of the vaporizer coil are: the coiling height tolerance is ±0.1×D 1 , D 1 is the pipe diameter; the outer diameter tolerance of the rolled pipe is controlled within (0,0.005×D 2 ), D 2 It is the outer diameter of the rolled ring.

[0016] In some embodiments, after the outer shell cylinder and the vaporization coil are welded, the inner wall of the outer shell cylinder is purged with gas.

[0017] In some embodiments, the method of encapsulating the gas cylinder liner includes: coating the outer surface of the cylinder portion of the gas cylinder liner with insulating aluminum foil, and then installing it into the outer shell cylinder.

[0018] In a second aspect, the present invention provides a welded insulated gas cylinder, comprising an outer shell cylinder and a gas cylinder liner, a vaporization coil is arranged between the outer shell cylinder and the gas cylinder liner, a spiral groove is opened on the inner wall of the outer shell cylinder, the vaporization coil is welded in the groove, and the gas cylinder liner is arranged closely to the vaporization coil.

[0019] In some embodiments, an outer wall of the gas cylinder liner is provided with an insulating aluminum foil, and the gas cylinder liner is arranged in close contact with the vaporization coil through the insulating aluminum foil.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention provides a groove on the inner wall of the outer shell so that the vaporizer coil can be screwed into the outer shell, which can improve the fit between the vaporizer coil and the outer shell, avoid separation in vibration conditions, facilitate subsequent positioning welding, and have a stronger ability to cope with thermal expansion and contraction changes in actual working conditions. In addition, due to the groove, under the same water volume, compared with the prior art, the gap between the inner liner of the gas cylinder and the outer shell is smaller, and the outer diameter of the gas cylinder is smaller.

[0022] 2. The present invention provides different groove depths according to the different thicknesses of the shell sheet, thereby preventing the deformation of the groove during the rolling process of the shell sheet, which makes it difficult for the subsequent vaporization coil to be screwed into the shell cylinder.

[0023] 3. The present invention can reduce the influence of the groove on the strength and rigidity of the shell sheet by providing an arc-shaped groove in the shell sheet less than or equal to 3.5 mm, wherein the deepest depth of the arc-shaped groove is 0.5 mm.

[0024] 4. The present invention heats the outer shell cylinder in a water bath before screwing in the vaporizer coil. The outer shell cylinder will expand when heated in a water bath, which facilitates the screwing in of the vaporizer coil. After the outer shell cylinder is cooled to room temperature, the vaporizer coil and the outer shell cylinder will fit better, thus preventing the vaporizer coil and the outer shell cylinder from separating in subsequent vibration conditions.

[0025] 5. The present invention covers the outer surface of the cylinder part of the gas cylinder liner with an insulating aluminum foil and then installs it into the outer shell cylinder. The insulating aluminum foil ensures the thermal insulation performance and facilitates the installation of the gas cylinder liner. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the internal structure of the welded insulated gas cylinder of the present invention.

[0027] Figure 2 It is a cross-sectional schematic diagram of a groove processed according to the present invention;

[0028] Figure 3 It is a structural schematic diagram of a welded insulated gas cylinder in the prior art;

[0029] Figure 4 The figure is a schematic diagram of the internal structure of a welded insulated gas cylinder in the prior art.

[0030] Reference numerals: outer shell body 1; outer shell sheet 2; groove 3; vaporizing coil 4; gas cylinder liner 5; neck pipe 6; manifold head 7; pipeline accessories 8. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] like Figure 1 As shown, the present invention provides a method for vertically welding insulated gas cylinder coils, comprising:

[0033] Step 1: Open the groove 3 on the shell sheet 2 according to the size requirements after the tube is rolled;

[0034] It is understandable that by providing the groove 3, the vaporizer coil 4 can be screwed into the outer shell body 1 along the groove 3, which can improve the fit between the vaporizer coil 4 and the outer shell body 1, avoid separation in vibration conditions, and facilitate subsequent positioning welding. In addition, due to the provision of the groove 3, under the same water volume, the gap between the gas cylinder liner 5 and the outer shell body 1 is smaller, and the outer diameter of the gas cylinder is smaller.

[0035] In some embodiments, Figure 2 As shown, the method for opening the groove 3 is: when the thickness of the shell sheet 2 is less than or equal to 3.5 mm, the depth of the groove 3 is 0.5 mm, and when the thickness of the shell sheet 2 is greater than 3.5 mm, the depth of the groove 3 is 1 mm.

[0036] When the thickness of the shell sheet 2 is less than or equal to 3.5 mm, the bottom of the groove 3 is arc-shaped, and the deepest depth is 0.5 mm. When the thickness of the shell sheet 2 is greater than 3.5 mm, the bottom of the groove 3 is flat.

[0037] The width L of the groove 3 is slightly larger than the outer diameter of the vaporizing coil 4 .

[0038] When the thickness of the outer shell sheet 2 is less than or equal to 3.5 mm, the depth of the groove 3 is smaller, which can avoid the groove 3 from having a significant impact on the structure of the outer shell cylinder 1; since the groove 3 of the outer shell sheet 2 greater than 3.5 mm will undergo significant deformation during the rolling process, the depth of the groove 3 is set to 1 mm, which can avoid the subsequent vaporization coil 4 from being unable to be screwed into the outer shell cylinder 1.

[0039] Step 2: rolling the outer shell sheet 2 into a shape and welding it into an outer shell cylinder 1;

[0040] Step 3, rolling the vaporizing coil 4 into shape;

[0041] In some embodiments, the requirements for the coiling of the vaporizer coil 4 are: the coiling height tolerance is ±0.1×D 1 , D 1 is the pipe diameter; the outer diameter tolerance of the rolled pipe is controlled within (0,0.005×D 2 ), D2 It is the outer diameter of the rolled ring.

[0042] Step 4: Heat the outer shell cylinder 1 in a water bath.

[0043] Furthermore, the outer shell cylinder 1 is heated to 75° C. in a water bath.

[0044] It is understandable that the outer shell cylinder 1 will expand after being heated, which facilitates the screwing in of the vaporizing coil 4, and the outer shell cylinder 1 will shrink after being cooled, so that the vaporizing coil 4 and the outer shell cylinder 1 will fit better.

[0045] Step 5: spirally install the vaporizing coil 4 into the outer shell body 1 along the groove 3;

[0046] Step 6: After the outer shell body 1 and the vaporizing coil 4 are naturally cooled to room temperature, they are welded and fixed, and spot welding can be used;

[0047] In some embodiments, after the outer shell cylinder 1 and the vaporizing coil 4 are welded, the inner wall of the outer shell cylinder 1 may be purged with gas to ensure that the interior is clean and dust-free.

[0048] Step 7: Install the gas cylinder liner 5.

[0049] In some embodiments, the method of encapsulating the gas cylinder liner 5 includes: coating the outer surface of the cylinder portion of the gas cylinder liner 5 with insulating aluminum foil, and then installing it into the outer shell 1.

[0050] It is understandable that by wrapping the gas cylinder liner 5 with insulating aluminum foil, the thermal insulation performance can be improved, and the friction between the gas cylinder liner 5 and the vaporization coil 4 can be reduced, making it easier to install the gas cylinder liner 5.

[0051] like Figure 1 As shown, the present invention also provides a welded insulated gas cylinder, comprising an outer shell cylinder 1 and a gas cylinder liner 5, a vaporization coil 4 is arranged between the outer shell cylinder 1 and the gas cylinder liner 5, a spiral groove 3 is opened on the inner wall of the outer shell cylinder 1, the vaporization coil 4 is welded in the groove 3, an insulating aluminum foil is arranged on the outer wall of the gas cylinder liner 5, and the gas cylinder liner 5 is arranged closely to the vaporization coil 4 through the insulating aluminum foil.

[0052] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for vertically welding insulated gas cylinder coils, characterized in that: include: A groove (3) is formed on the outer shell sheet (2) according to the size requirements after the tube is rolled; The outer shell sheet (2) is rolled into shape and welded into an outer shell cylinder (1); Rolling the vaporizing coil (4) into shape; The vaporizing coil (4) is spirally installed into the outer shell body (1) along the groove (3); After the outer shell cylinder (1) and the vaporizing coil (4) are naturally cooled to room temperature, they are welded and fixed; The gas cylinder liner (5) is mounted.

2. The method for vertically welding insulated gas cylinder coils according to claim 1 is characterized in that: The method for opening the groove (3) is as follows: when the thickness of the shell sheet (2) is less than or equal to 3.5 mm, the depth of the groove (3) is 0.5 mm; when the thickness of the shell sheet (2) is greater than 3.5 mm, the depth of the groove (3) is 1 mm.

3. The method for vertically welding insulated gas cylinder coils according to claim 2 is characterized in that: The groove (3) is formed in the following manner: when the thickness of the shell sheet (2) is less than or equal to 3.5 mm, the bottom of the groove (3) is arc-shaped, and the deepest depth is 0.5 mm; when the thickness of the shell sheet (2) is greater than 3.5 mm, the bottom of the groove (3) is flat.

4. The method for vertically welding insulated gas cylinder coils according to any one of claims 1 to 3, characterized in that: Before the vaporizing coil (4) is spirally installed into the outer shell cylinder (1) along the groove (3), the outer shell cylinder (1) is heated in a water bath.

5. The method for vertically welding insulated gas cylinder coils according to claim 4 is characterized in that: When the outer shell cylinder (1) is heated in a water bath, it is heated to 75°C.

6. The method for vertically welding insulated gas cylinder coils according to any one of claims 1 to 3, characterized in that: The requirements for the rolling of the vaporizing coil (4) are as follows: the rolling height tolerance is ±0.1×D1, where D1 is the pipe diameter; the rolling outer diameter tolerance is controlled at (0,0.005×D2), where D2 is the rolling ring outer diameter.

7. The method for vertically welding insulated gas cylinder coils according to any one of claims 1 to 3, characterized in that: After the outer shell cylinder (1) and the vaporizing coil (4) are welded, the inner wall of the outer shell cylinder (1) is purged with gas.

8. The method for vertically welding insulated gas cylinder coils according to any one of claims 1 to 3, characterized in that: The method for encapsulating the gas cylinder liner (5) comprises: coating the outer surface of the cylinder part of the gas cylinder liner (5) with a heat-insulating aluminum foil, and then installing it into the outer shell cylinder (1).

9. A welded insulated gas cylinder, characterized in that: The invention comprises an outer shell body (1) and a gas cylinder liner (5), wherein a vaporizing coil (4) is arranged between the outer shell body (1) and the gas cylinder liner (5), a spiral groove (3) is provided on the inner wall of the outer shell body (1), the vaporizing coil (4) is welded in the groove (3), and the gas cylinder liner (5) and the vaporizing coil (4) are arranged in close contact.

10. The welded insulated gas cylinder according to claim 9, characterized in that: The outer wall of the gas cylinder liner (5) is provided with a heat-insulating aluminum foil, and the gas cylinder liner (5) is arranged in close contact with the vaporization coil (4) via the heat-insulating aluminum foil.

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