A flat-mouth atmospheric pressure container with a double-layer cold shield vacuum insulation structure and a manufacturing method thereof

Abstract

The present invention relates to a flat-mouthed atmospheric pressure container with a double-layer cold screen vacuum insulation structure, and belongs to the technical field of low-temperature liquid storage containers. The upper port of the inner cylinder of the container is fixedly connected to the upper end of the inner cold screen sleeved outside the inner cylinder through an annular upper sealing plate, and the lower end of the inner cold screen is fixedly connected to the lower end of the outer cold screen through an annular lower sealing plate; the upper end of the outer cold screen is higher than the upper end of the inner cold screen and is fixedly connected to the outer extension flange ring; the outer side of the upper end of the inner cold screen is fixedly connected to the inner wall of the outer cold screen through an insulation ring, and the upper cover of the flange ring is equipped with a flat cover with a filled insulation layer on the inner surface; the lower part of the flange ring is fixedly connected to the outer shell, and a vacuum is formed between the outer shell and the inner cylinder. Since the gas sandwich structure formed by the double-layer cold screen has a heat-insulating effect and has sufficient strength, the vacuum between the inner and outer double-layer cold screens of the present invention and the inner cylinder and the outer shell constitute an organically combined heat-insulating structure, which not only increases the thermal resistance, can significantly reduce the rate at which external heat is transferred into the container, but also enhances the strength.

Description

Technical Field

[0001] The present invention relates to a flat-mouth atmospheric pressure container, and more specifically to a flat-mouth atmospheric pressure container with a double-layer cold screen vacuum insulation structure, and also to a manufacturing method thereof, belonging to the technical field of low-temperature liquid storage containers. Background Art

[0002] Vacuum insulated flat-mouth atmospheric pressure containers are used to store cryogenic liquids. Their working media are generally liquid nitrogen, liquid oxygen, liquid argon, and liquid carbon dioxide. The inner liner is made of austenitic stainless steel, and the outer shell material is selected from Q235-B, Q245R or 345R according to the site and national regulations. The inner and outer container interlayers are filled with insulation materials and evacuated. Since the existing containers of this type rely solely on the vacuum layer for insulation, the thermal insulation effect needs to be further improved. Summary of the invention

[0003] The purpose of the present invention is to provide a flat-mouth atmospheric pressure container with a double-layer cold shield vacuum insulation structure, which has a reasonable structure, feasible process and further significantly improved thermal insulation effect, and at the same time provide a manufacturing method thereof.

[0004] In order to achieve the above objectives, the basic technical solution of the flat-mouth atmospheric pressure container with a double-layer cold shield vacuum insulation structure of the present invention is:

[0005] It comprises an inner cylinder with a liquid adding nozzle at the bottom, the upper port of the inner cylinder is fixedly connected to the upper end of an inner cold screen sleeved outside the inner cylinder through an annular upper sealing plate, and the lower end of the inner cold screen is fixedly connected to the lower end of an outer cold screen through an annular lower sealing plate; the upper end of the outer cold screen is higher than the upper end of the inner cold screen and is fixedly connected to an extended flange ring; the outer side of the upper end of the inner cold screen is fixedly connected to the inner wall of the outer cold screen through an insulating ring, and the upper cover of the flange ring is provided with a flat cover with an inner surface filled with a heat-insulating layer; the lower part of the flange ring is fixedly connected to an outer shell, and a vacuum is formed between the outer shell and the inner cylinder.

[0006] Since the gas sandwich structure formed by the double-layer cold screen has a heat-insulating effect and has sufficient strength, the inner and outer double-layer cold screens of the present invention and the vacuum between the inner cylinder and the outer shell constitute an organically combined heat-insulating structure, which not only increases the thermal resistance, can significantly reduce the rate of external heat transfer into the container, but also enhances the strength.

[0007] A further improvement of the present invention is that the bottom of the inner cylinder is spherical, and the outer wall is covered with a heat insulating layer.

[0008] A further improvement of the present invention is that the outer wall of the external cold screen is coated with a heat insulating layer.

[0009] A further improvement of the present invention is that the upper sealing plate and the lower sealing plate are respectively U-shaped with the cross-section opening facing downward and the opening facing upward, so as to facilitate the butt welding with the cold shield port.

[0010] A further improvement of the present invention is that the flange ring is butted against the upper edge of the housing through a convex edge extending downward from the circumference, so as to facilitate butt welding with the housing.

[0011] A further improvement of the present invention is that a depression matching the protrusion on the lower surface of the flat cover is formed in the middle of the upper surface of the flange ring, and a sealing gasket is installed between the protrusion and the depression.

[0012] The manufacturing method of the flat-mouth atmospheric pressure container with a double-layer cold shield vacuum insulation structure of the present invention is as follows:

[0013] The first step is to make the inner cylinder body: weld the cylindrical cylinder body and the spherical crown bottom head with a liquid filling nozzle into the inner cylinder body;

[0014] The second step is to make a double cold screen: put the outer cold screen on the inner cold screen, and weld the lower ends of the inner and outer cold screens through the lower sealing plate, and weld the upper sealing plate on the upper end of the inner cold screen;

[0015] Step 3: Cylinder-screen assembly: put the double cold screens that are fixedly connected inside and outside onto the inner cylinder, and weld the upper port of the inner cylinder through the upper sealing plate;

[0016] Step 4: Flange welding - weld the flange ring on the upper end of the external cold screen;

[0017] Step 5: Insulation layer: Insulation layer is applied to the outer wall of the inner cylinder and the outer cold screen;

[0018] Step 6: Assemble and weld the outer shell - Cover the outer shell with the outer cold screen, weld its upper port to the convex edge of the flange ring extending downward, and lead out the liquid adding pipeline and vacuum port at the bottom, and vacuumize the space between the outer shell and the inner cylinder;

[0019] Step 7. Install the base - weld the base at the bottom of the shell;

[0020] Step 8. Isolation and covering - Fix the insulation ring between the outer side of the upper end of the inner cold screen and the inner wall of the outer cold screen, place the sealing gasket in the depression in the middle of the upper surface of the flange ring, and cover it with a flat cover with a filled insulation layer on the inner surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0022] Figures 2 to 9 yes Figure 1 Schematic diagram of the structures of each step of the manufacturing process of the embodiment. DETAILED DESCRIPTION

[0023] Embodiment 1

[0024] This embodiment has a flat-mouth atmospheric pressure container with a double-layer cold shield vacuum insulation structure. Figure 1As shown, the outer wall of the inner cylinder 1 with a spherical crown bottom and a liquid adding nozzle 1-1 is coated with an insulation layer 1-2 of a composite layer of aluminum foil and insulation paper.

[0025] The upper port of the inner cylinder 1 is welded and fixedly connected to the upper end of the inner cold shield 3 sleeved outside the inner cylinder 1 through the annular upper sealing plate 2 with an inverted U-shaped cross section. The lower end of the inner cold shield 1 is welded and fixedly connected to the lower end of the outer cold shield 5 whose outer wall is covered with an insulating layer 5-1 through the annular lower sealing plate 4 with a U-shaped cross section. The upper end of the outer cold shield 5 is higher than the upper end of the inner cold shield 3 and is welded and fixedly connected to the outer flange ring 6. Both the inner and outer cold shields are made of stainless steel.

[0026] The outer side of the upper end of the inner cold shield 3 is fixedly connected to the inner wall of the outer cold shield 5 through a glass fiber reinforced plastic heat insulation ring 10. The flange ring 6 is butt-welded to the upper edge of the outer shell 7 through a convex edge 6-1 extending downward around the circumference. A vacuum layer is formed between the outer shell 7 and the inner cylinder 1. The bottom of the outer shell 7 is supported on the bottom frame 12.

[0027] A recess 6-2 is formed in the middle of the upper surface of the flange ring 6 to match the protrusion 8-1 on the lower surface of the flat cover 8. A sealing gasket 9 is installed between the protrusion 8-1 and the recess 6-2. The flat cover 8 is fastened to the flange ring 6 by a peripheral fastener. The inner surface of the flat cover 8 has a filled foam insulation layer 8-2.

[0028] The manufacturing process of the flat-mouth atmospheric pressure container of this embodiment is as follows:

[0029] The first step is to make the inner cylinder - such as Figure 2 As shown, the cylindrical body and the spherical crown bottom head with a liquid adding nozzle 1-1 are welded into an inner cylinder 1.

[0030] The second step is to make a double cold screen - such as Figure 3 As shown, the outer cold shield 5 is sleeved on the inner cold shield 3, and the lower ends of the inner and outer cold shields are welded and fixed by a lower sealing plate 4 with a U-shaped cross section, and the upper end of the inner cold shield 3 is welded to an upper sealing plate 2 with an inverted U-shaped cross section.

[0031] The third step, tube screen combination - such as Figure 4 As shown, the double cold shields 3 and 5 that are welded and fixedly connected inside and outside are sleeved outside the inner cylinder 1, and the upper port of the inner cylinder 1 is welded through the upper sealing plate 2.

[0032] Step 4: Flange welding - such as Figure 5 As shown, a flange ring 6 is welded on the upper end of the outer cold shield 5 .

[0033] Step 5: Insulation layer - such as Figure 6 As shown, the outer wall of the inner cylinder 1 and the outer wall of the outer cold shield 5 are respectively covered with insulation layers 1-2 and 5-1.

[0034] Step 6: Welding the shell Figure 7As shown, the outer shell 7 is covered on the outer cold shield 5, the upper port is welded to the convex edge 6-1 extending downward from the flange ring 6, and the liquid adding pipeline A and the vacuum port B are led out at the bottom, and the outer shell 7 and the inner cylinder 1 are vacuumed.

[0035] Step 7: Install the base - such as Figure 8 As shown, a base 12 is welded and installed at the bottom of the housing 7;

[0036] Step 8: Isolation and Covering - Fig. 9 As shown, a fiberglass insulation ring 10 is fixed between the outer side of the upper end of the inner cold screen 3 and the inner wall of the outer cold screen 5, a sealing gasket 9 is placed in the depression in the middle of the upper surface of the flange ring 6, and a flat cover 8 with a foam insulation layer 8-2 filled on the inner surface is installed.

[0037] The experiment proves that the flat-mouth atmospheric pressure container with double-layer cold screen vacuum insulation structure of this embodiment uses double-layer cold screen and glass fiber reinforced plastic insulation block for physical isolation, forming an insulating gas screen located in the vacuum area, and the double insulation layer structure reasonably utilizes the space in the vacuum area between the outer shell and the inner cylinder to form multiple insulation barriers, so it can effectively reduce the radiation heat transfer between the inner cylinder and the outer shell, thereby effectively improving the insulation effect; and it helps to reduce the gasification amount of the liquid in the container, reduce the temperature difference between the inner and outer walls of the tank body, and reduce the resulting temperature difference stress. In addition, the process of this embodiment properly solves the manufacturing problem and is practicable.

[0038] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A method for manufacturing a flat-top atmospheric pressure container with a double-layer cold shield vacuum insulation structure, wherein the flat-top atmospheric pressure container comprises an inner cylinder with a liquid adding nozzle at the bottom, characterized in that: The upper port of the inner cylinder is fixedly connected to the upper end of the inner cold screen sleeved outside the inner cylinder through an annular upper sealing plate, and the lower end of the inner cold screen is fixedly connected to the lower end of the outer cold screen through an annular lower sealing plate; the upper end of the outer cold screen is higher than the upper end of the inner cold screen and is fixedly connected to the extended flange ring; the outer side of the upper end of the inner cold screen is fixedly connected to the inner wall of the outer cold screen through an insulating ring, and the inner surface of the upper cover of the flange ring has a flat cover filled with a thermal insulation layer; the lower part of the flange ring is fixedly connected to the outer shell, and a vacuum is formed between the outer shell and the inner cylinder; The upper sealing plate and the lower sealing plate are respectively U-shaped with the opening facing downward and upward; The flange ring is butted against the upper edge of the housing through a convex edge extending downward from the circumference; A depression matching the protrusion on the lower surface of the flat cover is formed in the middle of the upper surface of the flange ring, and a sealing gasket is installed between the protrusion and the depression; The bottom of the inner cylinder is spherical, and the outer wall is covered with a heat-insulating layer; The outer wall of the external cold screen is coated with a heat insulation layer; The manufacturing method is characterized in that it comprises the following steps: The first step is to make the inner cylinder body: weld the cylindrical cylinder body and the spherical crown bottom head with a liquid filling nozzle into the inner cylinder body; The second step is to make a double cold screen: put the outer cold screen on the inner cold screen, and weld the lower ends of the inner and outer cold screens through the lower sealing plate, and weld the upper sealing plate on the upper end of the inner cold screen; Step 3: Cylinder-screen assembly: put the double cold screens that are fixedly connected inside and outside onto the inner cylinder, and weld the upper port of the inner cylinder through the upper sealing plate; Step 4: Flange welding - weld the flange ring on the upper end of the external cold screen; Step 5: Insulation layer: Insulation layer is applied to the outer wall of the inner cylinder and the outer cold screen; Step 6: Assemble and weld the outer shell - Cover the outer shell with the outer cold screen, weld its upper port to the convex edge of the flange ring extending downward, and lead out the liquid adding pipeline and vacuum port at the bottom, and vacuumize the space between the outer shell and the inner cylinder; Step 7. Install the base - weld the base at the bottom of the shell; Step 8. Isolation and covering - Fix the insulation ring between the outer side of the upper end of the inner cold screen and the inner wall of the outer cold screen, place the sealing gasket in the depression in the middle of the upper surface of the flange ring, and cover it with a flat cover with a filled insulation layer on the inner surface.

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