Device for strain strengthening of inner container of vacuum-insulated cryogenic pressure vessel

Abstract

The present invention discloses a device for strain strengthening of an inner container of a vacuum-insulated cryogenic pressure vessel, comprising a water storage tank for suspending the inner container; a safety component connected to an exhaust port at the top of the inner container; and a water circulation component disposed at the bottom of the inner container. Wherein, the water circulation component includes a water inlet pipe connected to a water inlet at the bottom of the inner container, a high-pressure water pump connected to the water inlet pipe and disposed outside the water storage tank, and a water outlet pipe connected to a water outlet at the bottom of the inner container. The water outlet pipe penetrates through the water storage tank and is connected with a drain valve. By means of setting the water storage tank, the entire inner container wall is uniformly stressed, the deformation of each part is uniform, no flattening phenomenon will occur, materials are saved, the manufacturing cost is reduced, and the structure is simple, easy to use, and the strain strengthening effect is remarkable.

Description

Technical Field

[0001] The present invention relates to the field of inner containers of vacuum-insulated cryogenic pressure vessels, and in particular to a device for strain strengthening of the inner container of a vacuum-insulated cryogenic pressure vessel. Background Art

[0002] In the prior art, most factories use wooden saddle tooling for strain strengthening treatment. Conventional wooden saddle tooling has many defects as follows: In the design of the saddle for factory strengthening tests, the maximum diameter allowed for strengthening deformation is often calculated based on the diameter of the largest cylinder of the strengthening equipment, and finally the arc size of the saddle design R is determined. Since the manufacturing cost of wooden saddles is relatively high and the conditions for selecting wood are relatively harsh, factories generally do not make tooling of multiple R specifications. Instead, they often use the largest specification size to cover the small specification sizes to meet the production needs; for small-diameter strengthened containers, the contact area for support is limited and serious deformation is likely to occur; wooden saddles have relatively high costs, are difficult to process, have poor corrosion resistance, occupy a large area, are difficult to maintain, and have a short service life.

[0003] For example, the "Tooling for Strain Strengthening Treatment of an Austenitic Stainless Steel Container" disclosed in the Chinese patent literature, with the publication number CN212894849U. In this patent, a tooling for strain strengthening treatment of an austenitic stainless steel container is disclosed, including a pressure gauge exhaust assembly provided at the top of the container and a water supply pipeline assembly provided at the bottom of the container; the water supply pipeline assembly includes a connection joint, a water inlet and outlet assembly, and a strengthening pressure assembly; wherein, the water inlet and outlet assembly and the strengthening pressure assembly are connected to the connection joint through a connecting pipe to form a dual-pipeline switching arrangement; the water inlet and outlet assembly is provided below the strengthening pressure assembly; a pipe joint for connecting the connection joint is provided on the container; and the connection between the pipe joint and the connection joint is a detachable connection. In this patent, when the container is placed on the saddle, the above technical problems will occur; at the same time, when using a wooden saddle, it is necessary to add a reinforcing ring at the corresponding position of the inner container. The deformation of the reinforcing ring part is relatively small, the deformation of the position without the reinforcing ring is relatively large, the deformation of the inner container is uneven, and the area with relatively small deformation does not reach the strain strengthening effect, and the reinforcing ring increases a large amount of materials and manufacturing costs. Summary of the Invention

[0004] In order to solve the above technical problems; the present invention provides a method of setting a water storage tank; so that the entire inner container wall is uniformly stressed, the deformation of each part is uniform, no flattening phenomenon will occur, materials are saved, the manufacturing cost is reduced, and the structure is simple, easy to use, and the strain strengthening effect is remarkable.

[0005] In order to solve the above technical problems, the present invention is realized through the following technical solutions:

[0006] A device for strain strengthening of the inner container of a vacuum-insulated cryogenic pressure vessel, comprising a water reservoir for suspending the inner container; a safety component connected to the exhaust port at the top of the inner container; a water circulation component disposed at the bottom of the inner container; wherein the water circulation component includes a water inlet pipe connected to the water inlet at the bottom of the inner container, a high-pressure water pump connected to the water inlet pipe and disposed outside the water reservoir, and a water outlet pipe connected to the water outlet at the bottom of the inner container; the water outlet pipe penetrates through the water reservoir and is connected with a drain valve. There is liquid in the above-mentioned water reservoir, and the density of the liquid in the water reservoir is close to the average density of the inner container filled with water, so that the above-mentioned inner container can be suspended in the above-mentioned water reservoir without generating local shear stress and circumferential stress, avoiding the occurrence of collapse phenomenon; a safety component is provided at the exhaust port at the top of the above-mentioned inner container, which can ensure safety during strain treatment and ensure the quality and efficiency of strain strengthening; the above-mentioned water circulation component includes a water inlet pipe and a water outlet pipe, and strain strengthening treatment is carried out by pumping water through a high-pressure water pump. After the treatment is completed, the water is discharged through the drain valve connected to the above-mentioned water outlet pipe. The structure is simple and easy to use. Moreover, the above-mentioned water inlet is provided at the bottom of the inner container, with stable water inlet and sufficient exhaust, which can ensure the effect of strain strengthening.

[0007] Further, the material of the inner container is austenitic stainless steel; the inside of the water reservoir is a saturated sodium carbonate solution; the chloride ion in the tap water provided by the high-pressure water pump is less than or equal to 25 mg / L. The saturated sodium carbonate solution will not corrode the austenitic stainless steel, and its density is close to the average density of the above-mentioned inner container and water, which is convenient to use.

[0008] Further, a protective pad is laid on the inner wall of the water reservoir. It has a protective effect on the suspended inner container, avoids collisions, reduces production costs, and improves the efficiency of strain strengthening.

[0009] Further, the safety component includes an exhaust valve, a pressure gauge and a safety valve connected to the exhaust port. It can monitor the internal pressure and is convenient to use.

[0010] Further, both the water inlet pipe and the water outlet pipe are high-pressure metal hoses. They have a long service life, reduce the use cost, and have good strength and flexibility. During the strain strengthening process, they can stabilize the inner container.

[0011] Further, the water outlet pipe and the water inlet pipe are connected to the bottom of the water reservoir. It is convenient for drainage, the structural design is reasonable, and during the floating process of the inner container, it has a certain limiting function, ensuring the uniform force on the inner container during strain strengthening.

[0012] Compared with the prior art, the advantages of the present invention are as follows: the inner container wall is evenly stressed, the deformation of each part is uniform, there will be no flattening phenomenon, materials are saved, the manufacturing cost is reduced, and the structure is simple, easy to use, and the strain strengthening effect is remarkable. Brief Description of the Drawings

[0013] Figure 1 This is an embodiment of the device for strain strengthening of the inner container of a vacuum-insulated cryogenic pressure vessel according to the present invention.

[0014] Figure 2 This is another embodiment of the device for strain strengthening of the inner container of a vacuum-insulated cryogenic pressure vessel according to the present invention.

[0015] In the figure:

[0016] 1. Inner container; 2. Reservoir; 3. Safety component; 4. Exhaust port; 5. Water inlet; 6. Water inlet pipe; 7. High-pressure water pump; 8. Water outlet; 9. Water outlet pipe; 10. Drain valve; 11. Protective pad; 12. Exhaust valve; 13. Pressure gauge; 14. Safety valve. Detailed Description of the Embodiment

[0017] The following details the embodiments of the present invention, and the examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0019] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0020] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] See Figure 1This is an embodiment of a device for strain strengthening the inner container of a vacuum-insulated cryogenic pressure vessel according to the present invention. In this embodiment, the device includes a water reservoir 2, a safety component 3, and a water circulation component. There is a liquid in the water reservoir 2, and the density of the liquid in the water reservoir 2 is close to the average density of the inner container 1 filled with water, so that the inner container 1 can be suspended in the water reservoir 2. During the strengthening process of the inner container 1, there are three situations regarding its position in the water reservoir 2. First, when the average density of the inner container 1 is greater than the density of the liquid in the water reservoir 2, it sinks to the bottom. Most of the gravity of the inner container 1 is offset by the buoyancy, and there is a very small supporting force from the bottom of the water reservoir 2 to the inner container 1. This force is very small and can be basically ignored. Therefore, the local shear stress and circumferential stress can also be ignored. Second, when their densities are the same, the inner container 1 is suspended in the water reservoir 2. Third, when the average density of the inner container 1 is less than the density of the liquid in the water reservoir 2, the inner container 1 floats on the water surface. When the inner container 1 is suspended or floating in the water tank, the buoyancy acting on the wall of the inner container 1 is evenly distributed, and no local shear stress or circumferential stress is generated, avoiding the occurrence of the collapse phenomenon. The safety component 3 is arranged on the exhaust port 4 at the top of the inner container 1, which can ensure safety during the strain treatment and ensure the quality and efficiency of strain strengthening. The water circulation component includes a water inlet pipe 6 and a water outlet pipe 9. The water inlet pipe 6 and the water outlet pipe 9 are respectively connected to the water inlet 5 and the water outlet 8 at the bottom of the inner container 1. Strain strengthening treatment is carried out by pumping water through a high-pressure water pump 7. In this embodiment, the material of the inner container 1 is austenitic stainless steel. The inside of the water reservoir 2 is a saturated sodium carbonate solution. The chloride ion content in the tap water provided by the high-pressure water pump 7 is less than or equal to 25 mg / L. The saturated sodium carbonate solution will not corrode the austenitic stainless steel, and its density is close to the average density of the inner container 1 and water, which is convenient to use. Moreover, the water inlet pipe 6 and the water outlet pipe 9 are both high-pressure metal hoses, which have a long service life, reduce the use cost, and have good strength and flexibility. In other embodiments, it can also be set in other forms, not limited to this, and will not be elaborated here. After the treatment is completed, the water is discharged through the drain valve 10 connected to the water outlet pipe 9. The structure is simple and convenient to use. When in use, water is supplied into the inner container 1 for strain strengthening treatment. The structure is simple and convenient to use, and the strain strengthening effect is remarkable.

[0022] See Figure 2This is an embodiment of the device for strain strengthening of the inner container of a vacuum-insulated cryogenic pressure vessel according to the present invention. In this embodiment, the basic part is the same as that of the above embodiment and will not be described in detail here. In this embodiment, a protective pad 11 is laid on the inner wall of the above-mentioned water storage tank 2, which has a protective effect on the suspended inner container 1, avoids collisions, reduces production costs, and improves the efficiency of strain strengthening. At the same time, the above-mentioned safety component 3 includes an exhaust valve 12, a pressure gauge 13 and a safety valve 14 connected to the above-mentioned exhaust port 4, which can monitor the internal pressure and is convenient to use. Moreover, the above-mentioned water outlet pipe 9 and the above-mentioned water inlet pipe 6 are connected to the bottom of the above-mentioned water storage tank 2, which is convenient for drainage. The structural design is reasonable, and it has a certain limiting function during the floating process of the inner container 1, ensuring the stability of the device during strain strengthening and the uniform force on the inner container 1.

[0023] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A device for strain strengthening of the inner container of a vacuum-insulated cryogenic pressure vessel, characterized in that: including a water storage tank for suspending the inner container; a safety component connected to the exhaust port at the top of the inner container; a water circulation component disposed at the bottom of the inner container; wherein, the water circulation component includes a water inlet pipe connected to the water inlet at the bottom of the inner container, a high-pressure water pump connected to the water inlet pipe and disposed outside the water storage tank, and a water outlet pipe connected to the water outlet at the bottom of the inner container; the water outlet pipe penetrates through the water storage tank and is connected with a drain valve; the material of the inner container is austenitic stainless steel; the inside of the water storage tank is a saturated sodium carbonate solution; the chloride ion content in the tap water provided by the high-pressure water pump is less than or equal to 25 mg / L.

2. The device for strain strengthening of the inner container of a vacuum-insulated cryogenic pressure vessel according to claim 1, characterized in that: a protective pad is laid on the inner wall of the water storage tank.

3. The device for strain strengthening of the inner container of a vacuum-insulated cryogenic pressure vessel according to claim 1 or 2, characterized in that: the safety component includes an exhaust valve, a pressure gauge and a safety valve connected to the exhaust port.

4. The device for strain strengthening of the inner container of a vacuum-insulated cryogenic pressure vessel according to claim 1 or 2, characterized in that: both the water inlet pipe and the water outlet pipe are high-pressure metal hoses.

5. The device for strain strengthening of the inner container of a vacuum-insulated cryogenic pressure vessel according to claim 3, characterized in that: both the water inlet pipe and the water outlet pipe are high-pressure metal hoses.

6. The device for strain strengthening of the inner container of a vacuum-insulated cryogenic pressure vessel according to claim 1 or 2, characterized in that: the water outlet pipe and the water inlet pipe are connected to the bottom of the water storage tank.

7. The device for strain strengthening of the inner container of a vacuum-insulated cryogenic pressure vessel according to claim 3, characterized in that: the water outlet pipe and the water inlet pipe are connected to the bottom of the water storage tank.

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