Additive-manufactured storage box shell and manufacturing method of storage box shell

Abstract

The invention discloses an additive manufactured storage tank shell and a manufacturing method thereof. The additive manufacturing storage box comprises an air cavity shell, a liquid cavity shell and a diaphragm, and the opening end of the air cavity shell and the opening end of the liquid cavity shell are in sealed butt joint to form a storage box shell in a matched mode. The membrane is arranged in the storage box shell and used for dividing an inner cavity of the storage box shell into two parts. The liquid cavity shell comprises a liquid cavity main shell and a clamping ring, and the second axial end of the clamping ring is the opening end of the liquid cavity shell. The second axial end of the clamping ring extends into the opening end of the air cavity shell. The diaphragm is arranged in the air cavity shell. A mounting ring is formed on the outermost side of the circumferential direction of the diaphragm, the mounting ring is clamped between the clamping ring and the air cavity shell and elastically deforms under the action of clamping force, and the sealing effect similar to that of a sealing ring is achieved. The air cavity shell, the clamping ring and the liquid cavity main shell are all components formed through additive manufacturing. And at least one of the axial first end of the clamping ring and the open end of the air cavity shell is hermetically connected with the open end of the liquid cavity main shell in the circumferential direction.

Description

Technical Field

[0001] This invention belongs to the field of aerospace technology, and particularly relates to an additive manufacturing tank shell and a method for manufacturing the tank shell. Background Technology

[0002] Propellant tanks are used in the aerospace field. The function of the tank shell is to store propellant, reliably isolating it inside the tank before the system operates. During system operation, air pressure deforms a metal diaphragm, precisely controlling the supply of liquid propellant. The manufacturing process of the tank shell presents the following two challenges:

[0003] (1) Traditional manufacturing process is costly and time-consuming: First, the shell blank is formed by multiple processes such as stretching, spinning and forging. Then, machining is used to ensure dimensional accuracy. Finally, it is assembled by welding. The process is complicated, time-consuming and costly.

[0004] (2) Difficulty in installing rubber diaphragms in storage tanks: In traditional manufacturing processes, the outer shell consists of two parts: a liquid cavity shell and a gas cavity shell. Because a diaphragm needs to be installed inside the gas cavity shell during storage tank installation to ensure airtightness and functionality, the fit between the diaphragm and the shell is an interference fit. This makes it easy for the diaphragm to dislodge, twist, or be crushed during installation. At the same time, because the view is blocked by the shell during assembly, it is impossible to accurately judge the installation status of the diaphragm, resulting in a high rate of airtightness failure and frequent rework. Furthermore, diaphragm twisting and crushing will reduce the service life of the storage tank. Summary of the Invention

[0005] To address the above problems, the present invention provides an additively manufactured tank shell and a method for manufacturing the tank shell.

[0006] The technical solution of this invention is as follows:

[0007] An additively manufactured tank shell includes a gas chamber shell, a liquid chamber shell, and a diaphragm. The open ends of the gas chamber shell and the open ends of the liquid chamber shell are sealed together to form the tank shell. The diaphragm is disposed inside the tank shell and divides the inner cavity of the tank shell into two parts: a gas chamber on one side of the gas chamber shell and a liquid chamber on one side of the liquid chamber shell. The liquid chamber shell includes a main liquid chamber shell and a clamping ring. A first axial end of the clamping ring is connected to the open end of the main liquid chamber shell, and a second axial end of the clamping ring is the open end of the liquid chamber shell. The second axial end of the clamping ring extends into the open end of the gas chamber shell.

[0008] The diaphragm is disposed within the air chamber housing; a mounting ring is formed on the outermost circumferential side of the diaphragm. The mounting ring on the diaphragm extends from the second axial end of the clamping ring into the space between the clamping ring and the air chamber housing. The mounting ring is clamped between the clamping ring and the air chamber housing and undergoes elastic deformation under the action of clamping force, so that the inner annular side of the mounting ring is pressed against the outer wall of the clamping ring and the outer annular side of the mounting ring is pressed against the inner wall of the opening end of the air chamber housing. Under the action of the mounting ring, a sealed connection is achieved between the opening end of the air chamber housing and the second axial end of the clamping ring.

[0009] Furthermore, the air cavity shell, the clamping ring, and the liquid cavity main shell are all additively manufactured components; the first axial end of the clamping ring is sealed to the opening end of the liquid cavity main shell in the circumferential direction, and / or the opening end of the air cavity shell is sealed to the opening end of the liquid cavity main shell in the circumferential direction.

[0010] In a preferred embodiment of the additively manufactured storage tank, the clamping ring is welded to the air cavity shell;

[0011] The welding connection is spot welding, and the clamping ring is provided with a plurality of spot welding holes for spot welding; the area on the clamping ring that is connected to the mounting ring is a sealing area, and the position of the spot welding holes on the clamping ring is closer to the first axial end of the clamping ring than the sealing area.

[0012] In a preferred embodiment of the additively manufactured tank, a plurality of the spot weld holes are evenly distributed along the circumference of the clamping ring.

[0013] In a preferred embodiment of the additively manufactured storage tank, an annular groove is provided on the inner sidewall of the opening end of the air cavity shell, and the mounting ring is assembled in the annular groove and the mounting ring protrudes from the annular groove; under the action of the clamping force, the annular outer side of the mounting ring is pressed into the annular groove.

[0014] In a preferred embodiment of the additively manufactured tank, the second axial end of the clamping ring is provided with a guide angle.

[0015] In a preferred embodiment of the additively manufactured tank, the guide angle is 20 to 30 degrees.

[0016] In a preferred embodiment of the additively manufactured storage tank, a limiting structure is provided between the air cavity shell and the clamping ring to limit the depth to which the second end of the clamping ring extends into the air cavity shell.

[0017] In a preferred embodiment of the additively manufactured tank, the limiting structure includes:

[0018] A first limiting surface is provided on the clamping ring facing its axial first end;

[0019] A second limiting surface is provided on the air cavity housing, facing the liquid cavity housing;

[0020] The first limiting surface and the second limiting surface abut together.

[0021] In a preferred embodiment of the additively manufactured tank, the end of the open end of the liquid cavity main shell is simultaneously welded to the end of the first axial end of the clamping ring and the end of the open end of the gas cavity shell, wherein the welding connection is preferably laser circumferential welding.

[0022] In a preferred embodiment of the additively manufactured storage tank, in the axial direction of the clamping ring, the axial first end of the clamping ring is located inside the air cavity housing, and the distance between the end face of the axial first end of the clamping ring and the end face of the opening end of the air cavity housing is greater than or equal to 10 mm.

[0023] The open end face of the main shell of the liquid cavity abuts against the first axial end face of the clamping ring; the open end face of the main shell of the liquid cavity is welded to the open end face of the air cavity shell, and the welding connection is laser circumferential weld.

[0024] A method for manufacturing a tank shell, applicable to the additively manufactured tank shell described in any one of the above claims, wherein the method for manufacturing the tank includes:

[0025] Step 1: The air cavity shell, the clamping ring, and the liquid cavity main shell are fabricated by additive manufacturing. When fabricating the air cavity shell, the open end of the air cavity shell is set downwards. When fabricating the liquid cavity main shell, the open end of the liquid cavity main shell is set downwards.

[0026] Step 2: Place the air chamber housing with the open end facing upwards, and install the diaphragm inside the air chamber housing, wherein the mounting ring on the diaphragm is accommodated in an annular groove on the inner sidewall of the air chamber housing;

[0027] Step 3: Place the second axial end of the clamping ring downwards inside the air chamber housing, and press the mounting ring tightly into the annular groove with the outer side wall of the clamping ring facing downwards;

[0028] Step 4: Fix the clamping ring to the air cavity housing by laser spot welding to form a whole; wherein, the spot welding holes are set on the clamping ring;

[0029] Step 5: Place the open end of the main liquid chamber shell facing upwards, and fasten the entire assembly of the gas chamber shell, the diaphragm, and the clamping ring onto the open end of the main liquid chamber shell with the first axial end of the clamping ring facing downwards. Then, weld the open end of the main liquid chamber shell and the open end of the gas chamber shell together by laser circumferential welding.

[0030] Because of the above technical solutions, this invention has the following advantages and positive effects compared with the prior art:

[0031] The additive manufacturing method for the tank shell and the tank shell provided by this invention directly manufactures the air cavity shell, clamping ring and liquid cavity main shell by additive manufacturing. It has a short production cycle, low cost, fewer processes, low cost of quality control during production, and high product qualification rate.

[0032] The additive manufacturing method for a storage tank shell provided by this invention improves upon the existing two-shell design by incorporating two shells (i.e., an air chamber shell and a liquid chamber main shell) with a clamping ring. This allows for assembly where the diaphragm is first installed on the air chamber shell, followed by the clamping ring, and finally the liquid chamber main shell is integrally connected to the air chamber shell and the clamping ring. The clamping ring installation is the crucial step involving interference fit of the diaphragm (i.e., the diaphragm mounting ring is clamped between the clamping ring and the air chamber shell). Since the clamping ring is hollow, the diaphragm is visible during installation, allowing for accurate assessment of its installation status. This solves the problem of obstructed vision in existing assembly processes, which hinders the assessment of the diaphragm's installation status, thereby improving assembly efficiency and yield. Attached Figure Description

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention.

[0034] Figure 1 This is a schematic diagram of the structure of an additively manufactured tank shell according to the present invention;

[0035] Figure 2 This is a schematic cross-sectional view of an additively manufactured tank shell as shown in Example 1.

[0036] Figure 3 This is a cross-sectional schematic diagram of a clamping ring according to the present invention;

[0037] Figure 4 This is a schematic cross-sectional view of an additively manufactured tank shell as shown in Example 2.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1: Air chamber shell; 2: Clamping ring; 3: Liquid chamber main shell; 4: Diaphragm; 5: Spot weld hole; 6: Guide angle. Detailed Implementation

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0041] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0042] Example 1

[0043] See Figures 1 to 3 This embodiment provides an additively manufactured tank shell, including a gas chamber shell 1, a liquid chamber shell, and a diaphragm 4. The open ends of the gas chamber shell 1 and the open ends of the liquid chamber shell are sealed together to form the tank shell. The diaphragm 4 is disposed inside the tank shell and is used to divide the inner cavity of the tank shell into two parts, namely a gas chamber on one side of the gas chamber shell 1 and a liquid chamber on the other side of the liquid chamber shell.

[0044] The liquid chamber housing includes a main liquid chamber shell 3 and a clamping ring 2. The first axial end of the clamping ring 2 is connected to the open end of the main liquid chamber shell 3, and the second axial end of the clamping ring 2 is the open end of the liquid chamber housing. The second axial end of the clamping ring 2 extends into the open end of the gas chamber housing 1.

[0045] Diaphragm 4 is disposed inside air chamber housing 1. A mounting ring is formed on the outermost circumferential side of diaphragm 4. The mounting ring on diaphragm 4 extends from the second axial end of clamping ring 2 into the space between clamping ring 2 and air chamber housing 1. The mounting ring is clamped between clamping ring 2 and air chamber housing 1 and undergoes elastic deformation under the action of clamping force, so that the inner annular side of the mounting ring is pressed against the outer wall of clamping ring 2 and the outer annular side of the mounting ring is pressed against the inner wall of the opening end of air chamber housing 1. Under the action of the mounting ring, a sealed connection is achieved between the opening end of air chamber housing 1 and the second axial end of clamping ring 2.

[0046] Among them, the air cavity shell 1, the clamping ring 2, and the liquid cavity main shell 3 are all components formed by additive manufacturing. The method of directly manufacturing the air cavity shell 1, the clamping ring 2, and the liquid cavity main shell 3 by additive manufacturing has the advantages of short production cycle, low cost, fewer processes, low cost of quality control in the production process, and high product qualification rate.

[0047] The diaphragm 4 can be a one-piece rubber diaphragm 4. The mounting ring is the part that is thicker than other parts of the diaphragm 4 during molding. The shape of the mounting ring is preferably a circular cross-section. The mounting ring has a similar function to the sealing ring. The mounting ring is clamped between the inner wall of the opening end of the air chamber housing 1 and the outer wall of the second axial end of the clamping ring 2, thereby achieving a seal between the opening end of the air chamber housing 1 and the second axial end of the clamping ring 2.

[0048] The clamping ring 2 is welded to the air chamber housing 1. Specifically, the welding connection is spot welding, and the clamping ring 2 is provided with a plurality of spot welding holes 5 for spot welding. The area on the clamping ring 2 that connects with the mounting ring is a sealing area, and the position of the spot welding holes 5 on the clamping ring 2 is closer to the first axial end of the clamping ring 2 than the sealing area. In this way, the spot welding of the clamping ring 2 and the air chamber housing 1 will not affect the diaphragm 4. Preferably, the plurality of spot welding holes 5 are evenly distributed along the circumference of the clamping ring 2; of course, in other embodiments, the plurality of spot welding holes 5 can be selected in other distribution ways, which are not limited here.

[0049] An annular groove is provided on the inner sidewall of the open end of the air chamber housing 1. The mounting ring is fitted into the annular groove and protrudes from the annular groove. Under the action of clamping force, the outer annular side of the mounting ring is pressed into the annular groove. During the process of the second axial end of the clamping ring 2 extending into the air chamber housing 1, when the end of the second axial end of the clamping ring 2 reaches the depth where the mounting ring is located, the clamping ring 2 begins to contact the mounting ring. During the subsequent extension process, a part of the mounting ring protruding from the annular groove slides on the outer sidewall of the clamping ring 2 (the mounting ring will be squeezed and undergo elastic deformation during the sliding process) until the clamping ring 2 reaches the required depth and stops moving. At this time, the mounting ring reaches the sealing area on the outer sidewall of the clamping ring 2.

[0050] Furthermore, the second axial end of the clamping ring 2 can be provided with a guide angle 6. The design of the guide angle 6 allows for a smoother contact transition between the clamping ring 2 and the diaphragm 4 during the process of the second circumferential end of the clamping ring 2 extending into the air chamber housing 1, preventing damage to the diaphragm 4 during assembly. Preferably, the guide angle 6 is 20 to 30 degrees.

[0051] A limiting structure is provided between the air chamber housing 1 and the clamping ring 2 to limit the depth to which the second end of the clamping ring 2 extends into the air chamber housing 1. Specifically, in this embodiment, the limiting structure includes a first limiting surface on the clamping ring 2 facing its axial second end and a second limiting surface on the air chamber housing 1 facing the liquid chamber housing. As the axial second end of the clamping ring 2 extends into the air chamber housing 1, the first limiting surface and the second limiting surface gradually approach each other. When the clamping ring 2 reaches the required depth, the first limiting surface and the second limiting surface abut against each other, preventing the clamping ring 2 from extending further.

[0052] The first axial end of the clamping ring 2 is sealed to the opening end of the liquid chamber main shell 3 in the circumferential direction, and / or, the opening end of the gas chamber shell 1 is sealed to the opening end of the liquid chamber main shell 3 in the circumferential direction. In this embodiment, it is preferable to adopt the scheme of sealing the opening end of the gas chamber shell 1 to the opening end of the liquid chamber main shell 3 in the circumferential direction.

[0053] Specifically, along the axial direction of the clamping ring 2, the first axial end of the clamping ring 2 is located inside the gas chamber housing 1, and the distance between the end face of the first axial end of the clamping ring 2 and the end face of the opening end of the gas chamber housing 1 is greater than or equal to 10 mm; the end face of the opening end of the liquid chamber main housing 3 abuts against the end face of the first axial end of the clamping ring 2, and the end face of the opening end of the liquid chamber main housing 3 is welded to the end face of the opening end of the gas chamber housing 1 to achieve a seal. This welding connection can be achieved using laser circumferential welding. The weld formed by laser circumferential welding on the surface of the tank outer shell is as follows: Figure 1 As shown by the mark 'a' in the middle.

[0054] After the clamping ring 2 and the air chamber housing 1 are assembled, the first axial end of the clamping ring 2 is 10mm or more lower than the opening end of the air chamber housing 1. This setting makes it so that a step is formed at the opening end of the air chamber housing 1 and the clamping ring 2 as a whole, and a corresponding step is also formed at the opening end of the liquid chamber main housing 3. This makes it very convenient to find the right position when the two are docked and fastened, so as to achieve precise docking.

[0055] The additively manufactured tank shell provided in this embodiment improves upon the existing two-shell design by incorporating two shells (air chamber shell 1 and liquid chamber main shell 3) plus a clamping ring 2, with a guide angle 6 designed on the clamping ring 2. During assembly, the clamping ring 2 and air chamber shell 1 are first assembled by laser spot welding, and then the liquid chamber main shell 3 is assembled by laser circumferential welding. This solves the problem in the existing assembly process where the installation status of the diaphragm 4 cannot be determined due to obstructed vision, improving the assembly efficiency and yield of the diaphragm 4. Furthermore, the guide angle 6 on the clamping ring 2 ensures a smoother contact transition between the clamping ring 2 and the rubber diaphragm 4 during assembly, preventing damage to the diaphragm 4 and ensuring the service life of the tank.

[0056] For the clamping ring 2, the design of the limiting structure, in conjunction with the first axial end of the clamping ring 2 abutting the open end face of the liquid cavity main shell 3, restricts the free end of the clamping ring 2 to move in its axial direction; while the spot welding connection between the clamping ring 2 and the gas cavity shell 1 restricts the free end of the clamping ring 2 to rotate.

[0057] The following provides a method for manufacturing a tank shell, applicable to the above-mentioned additively manufactured tank shell. It should be noted that this method for manufacturing a tank shell is only a preferred method for manufacturing the above-mentioned additively manufactured tank shell, and not a limitation on the additively manufactured tank shell.

[0058] The manufacturing methods for the outer shell of the storage tank include:

[0059] Step 1: Fabricate the air cavity shell 1, clamping ring 2, and liquid cavity main shell 3 by additive manufacturing. When fabricating the air cavity shell 1, the open end of the air cavity shell 1 is set downwards. When fabricating the liquid cavity main shell 3, the open end of the liquid cavity main shell 3 is set downwards.

[0060] Step 2: Place the air chamber housing 1 with the open end facing upwards, and install the diaphragm 4 inside the air chamber housing 1, wherein the mounting ring on the diaphragm 4 is accommodated in the annular groove on the inner side wall of the air chamber housing 1;

[0061] Step 3: Place the second axial end of the clamping ring 2 downwards into the air chamber housing 1, and press the mounting ring tightly into the annular groove on the outer side wall of the clamping ring 2.

[0062] Step 4: Fix the clamping ring 2 to the air cavity housing 1 by laser spot welding to form a whole; wherein, the spot welding hole 5 is set on the clamping ring 2;

[0063] Step 5: Position the main liquid chamber shell 3 with the open end facing down, and fasten the entire assembly of the gas chamber shell 1, diaphragm 4, and clamping ring 2 onto the open end of the main liquid chamber shell 3 with the first axial end of the clamping ring 2 facing down. Then, weld the open end of the main liquid chamber shell 3 and the open end of the gas chamber shell 1 together by laser circumferential welding.

[0064] Furthermore, the more specific steps of the method for manufacturing the tank shell are as follows:

[0065] (1) Original model optimization: The liquid cavity shell is re-divided using UG software. The liquid cavity shell is divided from 32mm from the bottom surface of the liquid cavity shell. The original whole liquid cavity shell is divided into liquid cavity main shell 3 + clamping ring 2. The model of clamping ring 2 is modified to control its guide angle 6 to 24 degrees. The optimized model is exported as an STL format file.

[0066] (2) Model file processing before printing: The model is processed using Magics software. The placement angles of the air cavity shell 1, the liquid cavity main shell 3, and the clamping ring 2 are all perpendicular to the substrate. The air cavity shell 1 and the liquid cavity main shell 3 are both with their open ends facing down and tightly attached to the substrate. Supports are added to each model (i.e., the model of the air cavity shell 1, the model of the liquid cavity main shell 3, and the model of the clamping ring 2). Block supports and cone supports are added to all surfaces with an angle of less than 45° to the substrate. The processed file is sliced ​​and the sliced ​​file is imported into the printing device.

[0067] (3) Powder preparation: TC4 powder is selected, with a particle size range of 15-53μm, powder flowability ≤42s / 50g, loose density of 2.2-2.6g / cm3, tap density of 2.6-3g / cm3, and the powder is dried under vacuum / argon protection atmosphere at a temperature of 105-110℃ for 2-4h.

[0068] (4) Shell 3D printing: Set printing parameters: scanning speed 1100mm / s, scanning spacing 0.11mm, laser power 220W, powder layer thickness 40μm, spot compensation 0.04mm, shrinkage in x, y, z directions 1.003, interlayer rotation angle 67°;

[0069] (5) Clean up the toner after printing;

[0070] (6) Heat treatment: Vacuum annealing heat treatment, temperature 800℃, holding time 2h, and furnace cooling;

[0071] (7) Remove the support: The parts (air cavity shell 1, liquid cavity main shell 3 and clamping ring 2) are removed from the substrate by wire cutting. The block support and cone support are separated from the parts by hammering and milling. The connection point between the parts and the support is ground with an angle grinder.

[0072] (8) Inspection: Inspect dimensional accuracy and surface roughness;

[0073] (9) Assembly of the air chamber housing 1 and the clamping ring 2: With the open end of the air chamber housing 1 facing upwards, first install the rubber diaphragm 4 in the air chamber housing 1. The mounting ring on the rubber diaphragm 4 is installed in the annular groove on the inner wall of the air chamber housing 1, ensuring that the mounting ring fits tightly against the inner wall of the annular groove, and ensuring that there are no foreign objects between the clamping ring 2, the rubber diaphragm 4, and the air chamber housing 1. Then, with the second axial end of the clamping ring 2 facing downwards, fasten it onto the air chamber housing 1 (the fastening process is when the clamping ring 2 extends into the air chamber). During the assembly of housing 1, no harsh metallic scraping sound was emitted, and the rubber diaphragm 4 showed no obvious displacement or detachment. Then, laser spot welding was used to weld the gas cavity housing 1 to the clamping ring 2. The spot welding area was the pre-reserved spot welding hole 5 on the clamping ring 2. The welding parameters were controlled as follows: laser power 1000W, defocusing amount -10mm, and dwell time 1s, in order to control the thermal stress input of the welding, avoid excessive penetration, and prevent the rubber diaphragm 4 or the liquid cavity housing from deforming due to heat input.

[0074] (10) Assemble the main shell of the liquid cavity 3: Place the main shell of the liquid cavity 3 with the open end facing upwards, and snap the assembled gas cavity shell 1 and clamping ring 2 together (at this time, the first axial end of the clamping ring 2 in the whole is facing downwards). The end of the second axial end of the clamping ring 2 and the end of the open end of the gas cavity shell 1 are attached to the end of the open end of the main shell of the liquid cavity 3. Then, use laser circumferential welding to weld the main shell of the liquid cavity 3 together with the assembled gas cavity shell 1 and clamping ring 2. The welding area is the junction of the gas cavity shell 1 and the main shell of the liquid cavity 3. Control the welding parameters as laser power 900W, defocusing amount -5mm, and welding speed 1m / min to control the heat stress input of the welding, avoid excessive penetration, and prevent the heat input from causing deformation of the rubber diaphragm 4 or the gas cavity shell 1 and the main shell of the liquid cavity 3.

[0075] (11) Grinding: Grind the laser weld seam so that the weld seam is flush with the gas cavity shell 1 and the liquid cavity main shell 3;

[0076] (12) Sandblasting: Sandblasting is performed on the outer wall of the assembled tank shell. Paraffin wax is used to plug the gas and liquid valve ports of the tank. Special grade diamond is used for sandblasting. The diamond is made by mixing 60-mesh coarse sand and 120-mesh fine sand in a ratio of 4:6. The air pressure is 0.5-1MPa and the sandblasting distance is 50-100mm.

[0077] Example 2

[0078] See Figure 1 , Figure 3 and Figure 4 This embodiment provides an additively manufactured tank shell based on Embodiment 1.

[0079] In this embodiment, as Figure 4As shown, the axial first end face of the clamping ring 2 is no longer misaligned with the open end face of the air cavity shell, but is flush. When the liquid cavity main shell 3 is welded together with the assembled air cavity shell 1 and clamping ring 2, the open end of the liquid cavity main shell 3 is simultaneously welded to the axial first end of the clamping ring 2 and the open end of the air cavity shell 1. That is, the open end of the liquid cavity main shell 3, the axial first end of the clamping ring 2, and the open end of the air cavity shell 1 are welded together in one welding operation. Laser circumferential welding can be used as the welding method.

[0080] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. An additive manufactured tank shell, comprising a gas cavity shell, a liquid cavity shell and a diaphragm, an open end of the gas cavity shell and an open end of the liquid cavity shell are sealingly butted to cooperatively form an inner cavity of the tank shell; the diaphragm is arranged in the tank shell to divide the inner cavity of the tank shell into two parts, a gas cavity on one side of the gas cavity shell and a liquid cavity on one side of the liquid cavity shell; characterized in that: the liquid cavity shell comprises a liquid cavity main shell and a clamping ring, an axial first end of the clamping ring is connected with the open end of the liquid cavity main shell, and an axial second end of the clamping ring is the open end of the liquid cavity shell; the axial second end of the clamping ring extends into the open end of the gas cavity shell; the diaphragm is arranged in the gas cavity shell; a mounting ring is formed on a circumferential outermost side of the diaphragm, the mounting ring on the diaphragm extends from the axial second end of the clamping ring into a space between the clamping ring and the gas cavity shell, the mounting ring is clamped between the clamping ring and the gas cavity shell and elastically deformed under the clamping force, so that a ring-shaped inner side of the mounting ring is pressed against an outer side wall of the clamping ring and a ring-shaped outer side of the mounting ring is pressed against an inner side wall of the open end of the gas cavity shell, and the open end of the gas cavity shell and the axial second end of the clamping ring are sealingly butted under the action of the mounting ring; the gas cavity shell, the clamping ring and the liquid cavity main shell are all components formed by additive manufacturing; the axial first end of the clamping ring is sealingly connected with the open end of the liquid cavity main shell in a circumferential direction, and / or the open end of the gas cavity shell is sealingly connected with the open end of the liquid cavity main shell in the circumferential direction. the clamping ring is welded to the gas cavity shell; the welding connection is spot welding, and a plurality of spot welding holes for spot welding are arranged on the clamping ring; a region of the clamping ring connected with the mounting ring is a sealing region, and the positions of the spot welding holes on the clamping ring are closer to the axial first end of the clamping ring relative to the sealing region. an annular groove is arranged on the inner side wall of the open end of the gas cavity shell, the mounting ring is fitted in the annular groove and protrudes from the annular groove; and the ring-shaped outer side of the mounting ring is pressed in the annular groove under the action of the clamping force.

2. The additively manufactured tank enclosure of claim 1, wherein, the axial second end of the clamping ring is provided with a guide corner. the angle of the guide corner is 20-30 degrees.

3. The additively manufactured tank enclosure of claim 1, wherein, a limiting structure is arranged between the gas cavity shell and the clamping ring to limit the depth of the second end of the clamping ring extending into the gas cavity shell.

4. The additively manufactured tank enclosure of claim 1, wherein, the limiting structure comprises:

5. The additively manufactured tank enclosure of claim 4, wherein, a first limiting surface arranged on the clamping ring and facing the axial first end of the clamping ring; 6. The additively manufactured tank enclosure of claim 1, wherein, a second limiting surface arranged on the gas cavity shell and facing the liquid cavity shell; 7. The additively manufactured tank enclosure of claim 6, wherein, the first limiting surface and the second limiting surface abut. the end of the open end of the liquid cavity main shell is welded to the end of the axial first end of the clamping ring and the end of the open end of the gas cavity shell, and the welding connection is laser ring seam welding. ​ ​ 8. The additively manufactured tank enclosure of claim 1, wherein, ​ 9. The additively manufactured tank enclosure of claim 1, wherein, In the axial direction of the clamping ring, the axial first end of the clamping ring is inside the opening end of the air cavity shell, and the distance between the axial first end face of the clamping ring and the opening end face of the air cavity shell is greater than or equal to 10mm; The opening end face of the liquid cavity main shell abuts against the axial first end face of the clamping ring; the opening end of the liquid cavity main shell is welded to the opening end of the air cavity shell, and the welding connection is a laser ring seam welding.

10. A method of fabricating a tank enclosure, comprising: The method for manufacturing the storage tank shell suitable for the additive manufacturing of any one of claims 1 to 9 comprises: Step one: respectively manufacturing the air cavity shell, the clamping ring and the liquid cavity main shell by additive manufacturing, when manufacturing the air cavity shell, the opening end of the air cavity shell is arranged downward, and when manufacturing the liquid cavity main shell, the opening end of the liquid cavity main shell is arranged downward; Step two: placing the opening end of the air cavity shell upward, and installing the diaphragm in the air cavity shell, wherein the mounting ring on the diaphragm is accommodated in the annular groove on the inner side wall of the air cavity shell; Step three: buckling the axial second end of the clamping ring downward in the air cavity shell, and the outer side wall of the clamping ring tightly presses the mounting ring in the annular groove; Step four: fixing the clamping ring on the air cavity shell by laser spot welding to form a whole; wherein the spot welding hole is arranged on the clamping ring; Step five: placing the opening end of the liquid cavity main shell, and buckling the whole of the air cavity shell, the diaphragm and the clamping ring on the opening end of the liquid cavity main shell with the axial first end of the clamping ring downward, and then welding the opening end of the liquid cavity main shell and the opening end of the air cavity shell together by laser ring seam welding.

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