Manufacturing process of a thermal water tank

Abstract

The application relates to a manufacturing process of a heat-preservation water tank, which comprises the following steps: manufacturing a base, forming an inner cavity in the base; installing a first layer of side walls of an outer shell, and sticking sealing adhesive tapes at the joints in the inner cavity of the outer shell; installing a first layer of side walls of an inner shell, leaving a filling cavity between the inner shell and the outer shell, and the filling cavity being communicated with the inner cavity, and the inner shell being fixedly connected in a sealing mode; then, sealingly detecting the inner shell; installing subsequent layers of the outer shell and the inner shell from bottom to top according to the modes of steps two and five; installing a top of the heat-preservation water tank according to the modes of steps two to five, installing four hoisting assemblies on the outer shell, and fixedly installing reinforcing assemblies in the inner cavity of the inner shell; and filling foaming materials into the filling cavity and the inner cavity, so that an integrated heat-preservation layer is formed in the filling cavity and the inner cavity. The manufacturing process can improve the heat-preservation performance, structural strength, sealing reliability, appearance quality and process controllability of the heat-preservation water tank.

Description

Technical Field

[0001] This invention belongs to the field of insulated water tank technology, and particularly relates to a manufacturing process for an insulated water tank. Background Technology

[0002] Insulated water tanks are widely used in building water supply, industrial production, HVAC, and other fields. Their core function is to store water and reduce heat exchange between the water and the outside environment, ensuring that the water temperature is maintained within a preset range. However, existing insulated water tanks have many shortcomings in structural design and manufacturing processes, making it difficult to simultaneously achieve good sealing, insulation performance, structural strength, and ease of installation. Specific defects are as follows: Firstly, existing insulated water tanks are assembled using prefabricated insulated panels, employing stainless steel composite panels with built-in insulation as the outer protective layer, i.e., the tank shell, which is then assembled on-site. The drawbacks are: continuous thermal bridges are formed at the panel joints, severely reducing overall insulation efficiency. Secondly, when welding the panels, spot welding is required between the outer surfaces of the shell panels, with weld seams typically located at the four corners and center of the panels, making weld points unavoidable. Since the outer shell is usually made of brushed stainless steel to avoid light pollution, even after polishing the weld points, noticeable marks remain on the brushed surface, severely affecting the aesthetics.

[0003] Secondly, the foaming material is injected into the pre-formed inner and outer shell sandwich layer on-site through the filling foaming method. The foaming pressure can easily cause the liquid to leak from the seam of the outer shell. This not only wastes materials, but also results in incomplete filling of the insulation layer, gaps, and contamination of the tank body that is difficult to clean. This seriously affects the insulation effect and sealing of the water tank, reduces the insulation performance, and makes the product's insulation performance unstable and generally poor.

[0004] Furthermore, in terms of insulation design, traditional structures suffer from severe heat loss defects in the base area. The channel steel base is often uninsulated or simply wrapped with easily aging and moisture-prone rock wool. More commonly, the connection between the tank body and the base is often perforated. Since the base support in traditional structures is generally the same size as the inner shell bottom plate, a perforation naturally forms at the connection between the bottom of the first layer of the outer shell side plate and the base support, directly exposing the metal structure and making it the primary heat loss channel. The base itself lacks insulation, becoming a weak point in heat transfer and creating a thermal bridge effect. External heat easily enters the inner shell through the base, or heat from the inner shell is lost through the base, resulting in poor overall insulation performance of the water tank and increased energy consumption.

[0005] Secondly, in terms of structural strength, the inner shell of existing insulated water tanks is mostly a hollow thin-walled structure, lacking an effective internal reinforcement mechanism. When a large amount of water is stored in the tank, the inner shell will be subjected to the pressure of the water. After long-term use, it is prone to bulging, deformation, or even damage. In particular, the load-bearing capacity and deformation resistance of the inner shell of large insulated water tanks are insufficient, which seriously affects the service life and safety of the water tank.

[0006] Therefore, given the technical problems of existing insulated water tanks, such as poor sealing, insufficient insulation performance, and low strength of the inner shell structure, how to provide an insulated water tank and its manufacturing process that can avoid leakage of foaming materials, enhance insulation performance, improve structural rigidity, improve appearance quality, and facilitate hoisting has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] To solve at least one of the above-mentioned technical problems, the present invention provides a manufacturing process for an insulated water tank, comprising: Step 1: Make the base, creating an inner cavity inside the base; Step 2: Install the first layer of sidewalls of the outer shell. Install the multiple side panels and frame of the outer shell onto the base. The side panels of the outer shell are fixedly connected to the frame, to each other, to the base, and to the frame. Step 3: Apply sealing tape to the joints between the inner side panels and the frame, between the side panels, between the side panels and the base, and between the side panels and the frame. Step 4: Install the first layer of sidewalls of the inner shell. Fix the multiple side plates of the inner shell to the base, corresponding to the side plates of the outer shell, so that a filling cavity is reserved between the inner shell and the outer shell, and the filling cavity is connected to the inner cavity. The side plates of the inner shell are fixedly connected to each other and to the base with a sealing. Step 5: Conduct a sealing test on the inside of the first layer of the inner shell; Step Six: After the sealing test of the first layer of the inner shell is qualified, install the subsequent layers of the outer shell and inner shell from bottom to top in the manner of Step Two and Step Five, and continue the construction until the preset height of the insulated water tank is reached. Step 7: Install the top of the insulated water tank. After the side walls of the outer shell and inner shell are installed, install a top plate of the outer shell on the top layer of the outer shell side wall. Then install a top plate of the inner shell on the corresponding top plate of the outer shell. Install them alternately from the outside to the inside. Follow the order of steps 2 to 5 to stick sealing tape to the connection inside the top plate of the outer shell and perform a sealing test on the inside of the top plate of the inner shell. Step 8: Install a lifting assembly on the inner side of each of the four vertical edges of the outer shell. Each lifting assembly is perpendicular to the base and fixedly connected to the base. The lifting assemblies are used to lift the entire insulated water tank and to fix and install reinforcement assemblies in the inner cavity of the inner shell to support the inner shell. Step 9: Fill the filling cavity and inner cavity with foam material to form an integrated insulation layer in the filling cavity and inner cavity.

[0008] Further, in step one, the frame of the base is welded, and angle steel is welded to its inner side to form a supporting step; two plates are taken, one of which is welded to the angle steel and leaves a gap between it and the frame to form an upper plate for installing the inner shell, and the other plate is welded to the side of the frame away from the angle steel to form a lower plate. The upper plate, the lower plate and the frame are enclosed to form an inner cavity for filling with foam material.

[0009] Furthermore, in step two, the frame includes four vertical corner brackets perpendicular to the base. Before installing the first layer of the outer shell side panels, the four vertical corner brackets are fixedly installed at the four corners of the base, so that the four vertical corner brackets are parallel to each other to form a column. After the four vertical corner brackets are installed, the multiple side panels of the first layer of the outer shell are installed sequentially between two adjacent vertical corner brackets. After step six and before step seven, the frame also includes four horizontal corner pieces perpendicular to the base. After the top side panel of the box is completed, the horizontal corner pieces are fixedly installed on the side of the top side panel of the outer shell away from the base, and the four horizontal corner pieces are respectively installed on the four sides of the outer shell and enclose to form a rectangular frame.

[0010] Furthermore, in step two, the frame includes four sets of L-shaped assembly corner plates. Each set of L-shaped assembly corner plates is formed by stamping and is composed of two mutually perpendicular side plates. When installing the first layer of the outer shell side wall, the bending edges of the four sets of L-shaped assembly corner plates are installed in sequence to correspond to the four corners of the base, so that the four sets of L-shaped assembly corner plates surround each other to form a column. Then, the side plates of the first layer of the outer shell are inserted between two adjacent L-shaped assembly corner plates to complete the installation of the first layer of the outer shell side wall. After step six and before step seven, the frame also includes four horizontal corner pieces perpendicular to the base. After the top side panel of the box is completed, the horizontal corner pieces are fixedly installed on the side of the top side panel of the outer shell away from the base, and the four horizontal corner pieces are respectively installed on the four sides of the outer shell and enclose to form a rectangular frame.

[0011] Furthermore, in step four, inside the inner shell, the side plates of the inner shell are fully welded together with each other and with the base. After step five and before step six, at least one metal connecting piece is welded between each side plate of the inner shell and the corresponding side plate of the outer shell. And in step seven, at least one metal connecting piece is welded between each top plate of the inner shell and the corresponding top plate of the outer shell.

[0012] Furthermore, if there is a pipe interface requirement on the first side wall of the enclosure, after step four and before step five, holes are made at the corresponding positions on the outer shell and the inner shell according to the preset positions. Then, a stainless steel transition pipe with the appropriate interface type is inserted from the outside. The end of the stainless steel transition pipe near the inner shell is fully welded to the inner shell. Then, the stainless steel transition pipe is spot welded to the contact point with the outer shell and sealant is applied.

[0013] Furthermore, in step five, the airtightness of the inner shell is tested using aviation kerosene leakage detection. Aviation kerosene is applied to the back side of the inner shell weld, and the welded side of the inner shell weld is observed for kerosene wetting. If no kerosene wetting is observed on the welded side of the inner shell weld, it can be confirmed that there is no leakage in this layer of the inner shell weld.

[0014] Furthermore, in step seven, the last pair of top plates installed on the top of the outer shell and the top of the inner shell are both inspection plates with inspection holes, and the inspection holes on the inspection plates are connected to the internal cavity of the inner shell.

[0015] Furthermore, in step eight, the hoisting assembly consists of a hoisting rod and a hoisting lug. The hoisting rod is installed in the vertical edge corner piece, one end of the hoisting rod is fixedly connected to the base, and the other end of the hoisting rod passes through the top of the outer shell and is equipped with a hoisting lug. The reinforcement component includes multiple layers of tie rods and connecting rods. Each tie rod layer consists of two crisscrossing tie rods forming a grid. Both ends of each tie rod are fixedly connected to the inner shell. The multiple tie rod layers are spaced apart along the height direction of the inner shell, and the intersection points of the tie rods in the multiple tie rod layers correspond one-to-one. The connecting rods connect the intersection points of the multiple tie rod layers in sequence to form a spatial truss structure. The end of the connecting rod away from the base is fixedly connected to the inner side of the top plate of the inner shell. Each tie rod has multiple reinforcing ribs at both ends near the inner shell side plate. One end of the reinforcing rib is connected to the inner wall of the inner shell, and the other end is connected to the tie rod, forming a triangle with the tie rod and the inner shell wall. After step eight and before step nine, seal the outer shell seam at the top of the box and open foam injection holes and vent holes on the top plate of the outer shell; In step nine, polyurethane foam material is injected into the filling cavity between the outer shell and the inner shell through the foaming injection hole and the vent hole in one go, so that it fills the inner cavity of the base to form a heat insulation layer. After the foam material is injected, the foaming injection hole and the vent hole are sealed after the polyurethane foam material has cured.

[0016] Furthermore, the side and top plates of the outer shell, as well as the side and top plates of the inner shell, are all made of stainless steel stamping plates, which are formed in one piece by special molds to create a structure with reinforcing ribs, bosses, or folded edges on the plate surface.

[0017] This invention provides a manufacturing process for an insulated water tank. By setting up a base with a micro-cavity structure and installing the tank layer by layer from the outside to the inside and from the bottom up, and immediately applying sealing tape to the weld seams inside each layer after installation, the foaming material leakage is effectively prevented. The production process is clean and controllable, making the manufacturing process of the insulated water tank in this application highly controllable. This application solves the problem of leakage and contamination of the inner shell by using a sealed connection at each internal connection point of the inner shell. After each layer is completed, the sealing of each connection point of the inner shell is tested. Only after the sealing of the inner shell layer passes the test is the next layer of the inner shell installed. The subsequent layers of the outer shell and inner shell are installed layer by layer from bottom to top. In addition, the top of the insulated water tank also follows the side panel installation method, installing the outer panels one by one and alternating between the outer and inner panels. After each outer shell top panel is installed, the connection points inside the outer shell top panel are immediately sealed with sealing tape. Then the inner shell top panel is installed corresponding to the outer shell top panel. After each inner shell top panel is installed, the sealing of the inner shell top panel is tested. By constructing a uniform and sealed cavity layer by layer from the outside to the inside, and combining it with high-pressure integral one-time foaming, the problem of foam material leakage from the joints of the inner and outer shells and contamination of the tank is solved. This process ensures a continuous, seamless, and densely filled polyurethane insulation layer, eliminating the "thermal bridge" and "void" phenomena found in traditional processes. The inner cavity of the base is connected to the filling cavity between the outer shell and the inner shell, allowing the foam material to completely encapsulate the base and significantly improving heat dissipation. All seams on the outer shell are sealed by internal connections and internal adhesive tape, with no localized welds necessary for fixing the panels on the outer surface. This fundamentally avoids the permanent marks left on the frosted panel surface or the light pollution caused by external spot welding in traditional water tanks. By installing a lifting assembly on each of the four edges of the outer shell to lift the entire insulated water tank, and by fixing reinforcing components within the inner shell cavity, a multi-level stress system is formed. This effectively resists deformation during lifting, transportation, and under full-load water pressure, improving its structural strength and providing high safety performance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort. In the drawings, the same parts use the same reference numerals. The drawings are not drawn to scale.

[0019] Figure 1 This is a three-dimensional schematic diagram of the frame in the manufacturing process of an insulated water tank according to the present invention; Figure 2 This is a three-dimensional schematic diagram of a portion of the base in the manufacturing process of an insulated water tank according to the present invention; Figure 3 This is a three-dimensional schematic diagram of the base in the manufacturing process of an insulated water tank according to the present invention; Figure 4 This is another perspective view of the base in the manufacturing process of an insulated water tank according to the present invention; Figure 5 This is a three-dimensional schematic diagram of the base and four vertical corner brackets in the manufacturing process of an insulated water tank according to the present invention. Figure 6 This is a three-dimensional schematic diagram of the installation of the first layer of the outer shell sidewall in the manufacturing process of an insulated water tank according to the present invention; Figure 7 This is a three-dimensional schematic diagram of the L-shaped assembly corner plate in the manufacturing process of an insulated water tank according to the present invention; Figure 8 This is a three-dimensional schematic diagram of the first layer of sidewalls of the tank body installed in the manufacturing process of an insulated water tank according to the present invention. Figure 9 This is a three-dimensional schematic diagram of the completed installation of the side wall of the insulated water tank during the manufacturing process of the present invention. Figure 10 This is a three-dimensional schematic diagram of the manufacturing process of an insulated water tank according to the present invention, in which horizontal corner brackets are installed. Figure 11 This is a three-dimensional schematic diagram of the manufacturing process of an insulated water tank according to the present invention, in which a reinforcing component is installed. Figure 12 This is a three-dimensional schematic diagram of the installation of the top of the tank body during the manufacturing process of an insulated water tank according to the present invention; Figure 13 This is a three-dimensional schematic diagram of the completed installation of an insulated water tank during the manufacturing process of an insulated water tank according to the present invention. Figure 14 This is a schematic diagram of the hoisting assembly in the manufacturing process of an insulated water tank according to the present invention.

[0020] Explanation of main component symbols: 1-Base; 11-Frame; 111-Angle steel; 12-Upper plate; 13-Lower plate; 2-Outer shell; 21-L-shaped assembly angle plate; 211-Vertical edge corner piece; 212-Horizontal edge corner piece; 22-Inspection plate; 3-Inner shell; 31-Metal connecting piece; 4-Lifting assembly; 41-Lifting rod; 42-Lifting lug; 5-Reinforcing assembly; 51-Tie layer; 511-Reinforcing rib; 52-Connecting rod. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0023] It should also be noted that if the embodiments of the present invention involve directional indications, such as up, down, left, right, front, back, etc., these directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. Furthermore, if the embodiments of the present invention involve descriptions such as "first," "second," "S1," "S2," "step one," "step two," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance, or implicitly indicating the number of technical features indicated or the order of method execution. Those skilled in the art will understand that anything that does not violate the inventive concept and does not contradict the inventive points should be included within the scope of protection of the present invention.

[0024] This invention provides a manufacturing process for an insulated water tank, comprising the following steps: Step 1: Make the base, so that an inner cavity is formed inside the base.

[0025] like Figure 1As shown, specifically, in step one, the frame 11 of the base 1 is first welded. Several channel steels and multiple angle steels 111 are prepared, and the channel steels are welded together to form the frame 11 of the base 1. In this embodiment, the base frame is, for example, rectangular. Further, multiple angle steels 111 are welded at intervals along the circumference of the inner side of the frame 11 to form supporting steps, and the other connecting surfaces of the multiple angle steels 111 are at the same horizontal height and all extend horizontally towards the center of the frame 11. After the base frame 111 is completed, it is subjected to overall rust prevention treatment.

[0026] It should be noted that this embodiment does not limit the specific number of channel steel and angle steel required for the base frame; the specific number of channel steel and angle steel can be selected according to actual production needs. In this embodiment, the number of channel steel used for the base frame is, for example, seven pieces, and the number of angle steel used is, for example, fourteen pieces.

[0027] The insulated water tank manufactured in this embodiment has external dimensions of, for example, a length of 2000 mm, a width of 1500 mm, and a height of 2000 mm. Therefore, in this embodiment, the length of the base frame is, for example, 2000 mm and the width is, for example, 1500 mm.

[0028] Furthermore, such as Figure 2 , Figure 3 and Figure 4 As shown, two stainless steel plates of different sizes are used. One plate has an area smaller than the base frame area, while the other plate has an area greater than or equal to the base frame area. The smaller plate is welded to the other connecting surface of the angle steel, leaving gaps between its four sides and the frame. This plate forms the upper plate 12 for mounting the inner shell. The other plate is welded to the side of the frame away from the angle steel and covers the frame to form the lower plate 13 of the base. The upper plate 12, the lower plate 13, and the frame 11 together form an inner cavity for filling with foam material.

[0029] This embodiment, by forming an inner cavity for filling with foam material between the upper plate 12, the lower plate 13 and the frame 11, and the supporting step design of the base angle steel 111, allows the foam material to completely cover the entire base 1 after filling the inner cavity, significantly reducing heat dissipation and further improving the heat preservation performance of the insulated water tank.

[0030] Step 2: Install the first layer of sidewalls of the outer shell. Install the multiple side panels and frame of the outer shell onto the base. The side panels of the outer shell are fixedly connected to the frame, to each other, to the base, and to the frame.

[0031] In this embodiment, the box body is welded layer by layer from the outside to the inside.

[0032] Specifically, the sheet metal used for assembling the outer shell, and the main sheet metal used for both the outer and inner shells, are standard-sized stainless steel stamped plates manufactured using specialized stamping dies. Through the stamping die, these plates have regularly distributed reinforcing ribs, bosses, or peripheral folded edges formed on their surfaces. These inherent reinforcements significantly improve the structural rigidity and deformation resistance of the individual plates. Standard specifications include, but are not limited to, 1000mm×1000mm, 1000mm×500mm, and 500mm×500mm. In practical applications, to balance corrosion resistance and cost, matte stainless steel plates from the SUS202 series are typically used for the outer shell, while matte stainless steel plates from the SUS304 series can be used in highly corrosive or demanding environments.

[0033] To balance economy and outdoor weather resistance, the outer shell is made of 1.2mm thick SUS202 matte stainless steel standard stamped plate.

[0034] In one embodiment, four L-shaped stainless steel corner brackets, each 2000mm long and with a side length of 50mm, are prepared. In this embodiment, the outer shell frame includes four vertical corner brackets perpendicular to the base, i.e., four L-shaped stainless steel corner brackets, each 2000mm long and with a side length of 50mm, wherein the length of the vertical corner brackets is consistent with the height of the insulated water tank's outer shell. In this embodiment, the first layer of the outer shell's sidewalls is assembled using a split structure, specifically, as shown... Figure 5 and Figure 6 As shown, before installing the first layer side panels of the outer shell 2, four vertical edge-sealing corner pieces 211 are fixedly installed at the four corners of the base 1, so that the four vertical edge-sealing corner pieces are parallel to each other to form a column. After the four vertical edge-sealing corner pieces are installed, multiple side panels of the first layer of the outer shell are installed sequentially between two adjacent vertical edge-sealing corner pieces. Each vertical edge-sealing corner piece 211 will serve as the edge-sealing structure at the corner of the corresponding subsequent facade layer. Alternatively, the side panels of the outer shell can be installed and spot-welded from one side of the base 1. When the side panel of the outer shell 2 is installed to the edge of the outer shell, the first vertical edge-sealing corner piece 211 is welded perpendicular to the base 1. Then, the other side panel of the first layer of the outer shell 2 is installed on the adjacent side of the first vertical edge-sealing corner piece 211, and its edge is welded and fixed to the installed corner piece. The side of the side panel near the base is also welded and fixed to the base frame. In this way, the installation and fixing of the four side panels and four vertical L-shaped edge-sealing corner pieces of this layer of the outer shell are completed alternately.

[0035] In another embodiment, the first sidewall of the housing is assembled using a one-piece structure, specifically, as shown in... Figure 7As shown, the frame includes four sets of L-shaped assembly corner plates 21. Each L-shaped assembly corner plate is formed by stamping, with each set consisting of two mutually perpendicular side plates. Specifically, according to the design of the water tank size, the two adjacent side plates at each vertical corner, along with the reinforcing structure at the included angle, are stamped into an integral stainless steel L-shaped assembly corner plate in one piece using a large special stamping die. When installing the first layer of the outer shell 2, the bent edges of the four sets of L-shaped assembly corner plates 21 are installed sequentially at the four corners of the base 1, so that the four sets of L-shaped assembly corner plates 21 surround each other to form a column. Then, the side plates of the first layer of the outer shell 2 are inserted and welded between two adjacent L-shaped assembly corner plates 21, completing the installation of the first layer of the outer shell 2.

[0036] It should be noted that the seams between the plates of the outer casing 2 and the connections between the side plates and the base frame 11 are fixed by spot welding at appropriate intervals, such as 200-250mm. Optionally, the intervals may be 200mm, 230mm, or 250mm.

[0037] Step 3: Apply sealing tape to the joints between the inner side panels and the frame, between the side panels, between the side panels and the base, and between the side panels and the frame.

[0038] Specifically, after the first layer of sidewall welding of the outer shell is completed, sealing tape is immediately applied to all internal seams of the outer shell to form a sealed cavity inside the outer shell. In this embodiment, by pre-constructing a completely sealed foaming cavity, leakage from the seams of the outer shell can be effectively prevented when foaming material is injected subsequently.

[0039] Step 4: Install the first layer of sidewalls of the inner shell. Fix the multiple side panels of the inner shell to the base, corresponding to the side panels of the outer shell, so that a filling cavity is reserved between the inner shell and the outer shell, and the filling cavity is connected to the inner cavity. The side panels of the inner shell are fixedly connected to each other and to the base with a sealing.

[0040] Specifically, such as Figure 8 As shown, in this embodiment, multiple side plates of the inner shell 3 are vertically installed around the four sides of the base plate to form the four sides of the first layer of the inner shell 3, and the side plates of the inner shell 3 are fully welded together with each other and with the base 1, so that the joints inside the inner shell 3 are sealed.

[0041] It should be noted that there is a preset distance between the outer shell 2 and the corresponding side plates of the inner shell 3, which is sufficient to form an effective thermal insulation effect. The thickness of the filling cavity formed by this preset distance ranges from 50mm to 150mm. Optionally, in this embodiment, a filling cavity with a thickness of, for example, 50mm, 100mm or 150mm is reserved between the inner shell 3 and the outer shell 2.

[0042] The inner shell's three side panels are also made of standard-sized stainless steel stampings with reinforced structural features, manufactured using specialized stamping dies. Their standard specifications match those of the outer shell's stampings, enabling standardized and efficient modular construction. Because the inner shell directly contacts the stored water, it requires higher standards of hygiene and corrosion resistance. Therefore, the inner shell plates are typically made of SUS304 stainless steel. For applications requiring higher standards, such as storing special liquids or operating in highly corrosive environments, SUS316 or SUS316L stainless steel can be used. Preferably, the standard configuration for the inner shell plates uses 1.5mm thick SUS304 stainless steel stampings. The inner and outer shell plates maintain consistency in core manufacturing processes—specifically, they are stamped using specialized dies, and their standard dimensions remain the same. The differences lie primarily in the material type, thickness, and surface treatment, selected based on their functional positioning.

[0043] Optionally, if the side panel of this layer of the enclosure requires pipe interfaces, the installation should be performed after the first layer of the inner shell is fully welded and before the first layer of the inner shell is leak-tested, i.e., after step four and before step five. Specifically, holes are drilled at corresponding positions on the outer shell and the inner shell according to preset locations. A stainless steel transition pipe with an appropriate interface type is then inserted from the outside. The end of the stainless steel transition pipe closest to the inner shell is fully welded to the inner shell, and then the contact point between the stainless steel transition pipe and the outer shell is spot-welded and sealed with sealant. When the distance between the inner and outer shells is 50mm, the length of the transition pipe is greater than 50mm.

[0044] It should be noted that the length of the stainless steel transition pipe is greater than the distance between the inner and outer shells. The pipe interface in this embodiment features excellent sealing and insulation, and its connection is relatively reliable. Through pre-drilling, pipe insertion, full welding to the inner shell, and flexible connection to the outer shell, the reliable sealing of the inner shell at the stainless steel transition pipe interface is ensured. Simultaneously, the extended pipe fittings prevent thermal bridging. The transition pipe is specially adapted for threaded or flanged connections, ensuring convenient and secure connection to external pipelines. The flexible sealing treatment on the outer shell side effectively absorbs vibration and stress during operation.

[0045] Specifically, the structure of the transition pipe is adapted to the type of pipe interface. For threaded interfaces, the end passing through the outer shell has an internal thread, or it is a fully threaded pipe fitting with internal threads at both ends. For flange connections, a plain pipe with a flange at one end can be used, or an externally threaded pipe with a length greater than the preset distance can be used to fit a flange with internal threads. This method ensures absolute watertightness at the pipe interface, reliable mechanical connection, and continuity of the insulation layer.

[0046] Step 5: Conduct a sealing test on the inside of the first layer of the inner shell.

[0047] In step five, after the first layer of side plates of the inner shell is fully welded, all welds of the first layer of the inner shell are immediately tested for aviation kerosene leakage. Specifically, the inner shell is sealed using an aviation kerosene leakage test method. Aviation kerosene is applied or sprayed onto the back side plate seam of the inner shell weld, which is the unwelded side. The welded side of the inner shell weld is then observed for kerosene wetting. If no kerosene wetting is observed on the welded side of the inner shell weld, it can be confirmed that there is no leakage in this layer of the inner shell weld.

[0048] like Figure 8 As shown, after step five and before step six, i.e. after the first layer of the inner shell has passed leak testing, at least one metal connecting piece is welded between each side plate of the inner shell and the corresponding side plate of the outer shell. In this embodiment, the outer shell and the inner shell are fixed together by welding metal connecting pieces that are spaced apart. Specifically, metal connecting pieces are welded to the upper edges and sides of the inner shell side plate and the outer shell side plate corresponding to this layer.

[0049] like Figure 9 As shown, step six: After the sealing performance of the first layer of the inner shell 3 is qualified, the subsequent layers of the outer shell 2 and inner shell 3 are installed from bottom to top in the manner of steps two and five, and the installation is carried out in a cycle until the top side wall of the insulated water tank is reached, that is, the preset height of the tank is achieved, such as 2000mm.

[0050] Specifically, the second layer of sidewalls of the enclosure is installed layer by layer from bottom to top and from outside to inside. First, the second layer of sidewalls of the outer shell 2 is installed by spot welding the multiple side panels of the second layer of the outer shell 2 to the corresponding side panels of the first layer of the outer shell 2. That is, the side panels of the second layer of the outer shell 2 are spot welded to each other, the second layer side panels are spot welded to the first layer side panels, and the second layer side panels are spot welded to the vertical edge corner pieces of the first layer. The side panels of the second layer of the outer shell 2 are installed at the end of the first layer side panel of the outer shell 2 away from the base, i.e., the construction follows the bottom-up, layer-by-layer approach. After the second layer of sidewalls of the outer shell 2 is installed, all weld joints inside the second layer of sidewalls of the outer shell 2 are sealed with sealing tape as described in step three. After the second layer of the outer shell sidewall is installed, the corresponding second layer of the inner shell 3 sidewall is installed. Multiple side plates of the second layer of the inner shell 3 are fully welded and fixed to the corresponding side plates of the first layer of the inner shell 3. That is, the side plates of the second layer of the inner shell 3 are fully welded to each other, and the second layer side plates are fully welded to the first layer side plates. The side plates of the second layer of the inner shell 3 are installed at the end of the first layer side plate of the inner shell 3 furthest from the base, following a bottom-up, layer-by-layer construction approach. Immediately after the full welding installation of the second layer of the inner shell 3 sidewall, a sealing test is performed on this layer of the inner shell 3 sidewall, using the same method as the sealing test of the first layer sidewall of the inner shell 3, employing an aviation kerosene leakage test. After the sealing test of the second layer of the inner shell 3 sidewall is passed, multiple metal connecting pieces are welded and installed at intervals between the second layer side plate of the inner shell 3 and the corresponding second layer side plate of the outer shell. Specifically, metal connecting pieces are welded to the upper edge and side of the corresponding inner shell side plate and outer shell side plate of this layer.

[0051] Optionally, in this embodiment, the inner shell and the outer shell are connected into a rigid whole by welding and fixing each layer of the inner shell side plate to the corresponding outer shell side plate through spaced metal connecting pieces. The connecting pieces are usually welded to the upper edge and side of the inner shell side plate and the outer shell side plate.

[0052] This embodiment uses metal connecting plates to improve the overall structural stability of the water tank, ensure the quality of the insulation layer, and extend the service life of the equipment. Firstly, the outer and inner shells are mostly thin-walled structures, making them prone to relative displacement due to vibration and water pressure during transportation, hoisting, or filling with water. This can even lead to deformation of the inner shell and denting of the outer shell. The metal connecting plates rigidly connect the inner and outer shells, forcibly maintaining a uniform gap between them and preventing local gaps from being too narrow or too wide. Therefore, multiple metal connecting plates can fix their relative positions, preventing the tank shell from shifting.

[0053] Secondly, the use of metal connecting plates ensures the quality of the foamed insulation layer. Uniform cavity size is a prerequisite for a uniform and dense foamed layer. If the spacing is too narrow, the foam material cannot expand fully, easily forming voids; if the spacing is too wide, the foam material will not accumulate evenly, resulting in density fluctuations. The supporting role of the metal connecting plates ensures consistent foam layer thickness, eliminates thermal bridging risks, improves overall insulation performance, and prevents leakage due to pressure caused by shell misalignment. Simultaneously, the metal connecting plates between the outer and inner shells can distribute the load and enhance resistance to deformation. After the water tank is filled with water, the inner shell expands outward under water pressure, while the outer shell withstands the impact of the external environment. The metal connecting plates can distribute the expansion force of the inner shell to the outer shell, while simultaneously dispersing the external force on the outer shell to the inner shell, reducing localized stress concentration and preventing bulging of the inner shell and cracking of the outer shell. This is particularly suitable for structural reinforcement of large insulated water tanks.

[0054] Furthermore, the subsequent side walls of the enclosure, up to the top side wall, are installed in the same manner as the second side wall. The construction sequence from bottom to top and from outside to inside remains unchanged, namely, the sequence of installing the outer shell layer, the inner shell layer, checking the leak of the inner shell layer, and installing the connecting piece between the inner shell layer and the outer shell layer.

[0055] like Figure 10 As shown, after step six and before step seven, the frame also includes four horizontal corner pieces 212 perpendicular to the base. After completing the top side panel of the housing, the horizontal corner pieces 212 are fixedly installed on the side of the top side panel of the outer shell 2 away from the base 1, and the four horizontal corner pieces 212 are respectively installed on the four sides of the outer shell 2, forming a rectangular frame. It should be noted that the length of the horizontal corner pieces is of two types: one is consistent with the length of the insulated water tank, and the other is consistent with the width of the insulated water tank.

[0056] Specifically, each horizontal edge corner piece 212 is installed on the top layer of the corresponding side of the outer shell 2. The horizontal edge corner piece 212 is spot welded to the side plate of the top side wall of the outer shell 2, and its two ends are spot welded to the vertical edge on this side respectively. All welds here are sealed with sealing tape.

[0057] It should be noted that if there is a need to open pipe interfaces on the side walls of subsequent layers of the enclosure, the method of opening pipe interfaces and installing stainless steel transition pipes shall be the same as that of opening pipe interfaces on the side walls of the first layer of the enclosure, and will not be elaborated here.

[0058] Step 7: Install the top of the insulated water tank. After the side walls of the outer shell and inner shell are installed, install a top plate of the outer shell on the top layer of the outer shell side wall. Then install a top plate of the inner shell on the corresponding top plate of the outer shell. Install them alternately from the outside to the inside. Follow the order of steps 2 to 5 to stick sealing tape to the connection inside the top plate of the outer shell and perform a sealing test on the inside of the top plate of the inner shell.

[0059] like Figure 10 , Figure 12 and Figure 13 As shown, in step seven, at least one metal connecting piece is welded between each top plate of the inner shell 3 and the corresponding top plate of the outer shell 2. Also in step seven, the last pair of top plates installed on the top of the outer shell 2 and the top of the inner shell 3 are both inspection plates with inspection holes, the inspection holes on the inspection plates 22 communicating with the internal cavity of the inner shell.

[0060] Specifically, the multiple top plates of the outer shell 2 are spot-welded to the corresponding horizontal edge corner pieces 212 on the outer shell 2, and the top plates of the outer shell 2 are also spot-welded to each other. After the spot welding of each top plate of the outer shell 2 is completed, all weld joints of the top plate of the outer shell 2 are sealed with sealing tape in the manner described in step three. After the sealing tape is applied to one top plate of the outer shell 2, a corresponding top plate of the inner shell 3 is installed. The top plate of the inner shell 3 is then fully welded to the corresponding top side plate of the inner shell 3, and the top plates of the inner shell 3 are also fully welded to each other, i.e., construction is carried out layer by layer from the outside to the inside. After the full welding of the top plate of the inner shell 3 is completed, the joint of the top plate of the inner shell 3 is immediately tested for sealing. The testing method is the same as that for the joint of the side wall of the inner shell 3, which uses the aviation kerosene leakage test method. After the sealing performance of the top plate of the inner shell 3 passes the inspection, multiple metal connecting pieces are welded and installed at intervals between the top plate of the inner shell 3 and the corresponding top plate of the outer shell 2. Specifically, metal connecting pieces are welded to the upper edge and side of the corresponding top plates of the inner shell 3 and the outer shell 3. It should be noted that the sheet material used for the top plate of the outer shell 2 is the same as that used for the side plates of the outer shell 2, and the top plate of the inner shell 3 is the same as that used for the side plates of the inner shell 3.

[0061] In this embodiment, all seams of the outer shell are sealed with internal sealing tape, and there are no local welds on the outer surface necessary for fixing the plates. Therefore, the insulated water tank in this embodiment has a beautiful and seamless appearance, avoiding the permanent marks left on the frosted plate surface or the light pollution caused by external spot welding on the mirror panel of traditional water tanks. This solves the problem of obvious welds on the outer shell of traditional water tanks. In particular, the use of an integrated L-shaped assembly corner plate on the first side wall of the outer shell further reduces vertical edge seams, resulting in a simpler and smoother appearance.

[0062] like Figure 11 and Figure 13 As shown, step eight: Install a hoisting component 4 on the inner side of each of the four vertical edges of the outer shell 2. Each hoisting component 4 is perpendicular to the base 1 and fixedly connected to the base 1. The hoisting component 4 is used to hoist the entire insulated water tank and to fix and install the reinforcing component 5 in the internal cavity of the inner shell 3 to support the inner shell 3.

[0063] In step eight, as Figure 14As shown, the lifting assembly 4 consists of a lifting rod 41 and a lifting lug 42. The lifting rod 41 is installed in the vertical edge corner piece 211. One end of the lifting rod 41 is fixedly connected to the base 1, and the other end of the lifting rod 41 passes through the top of the outer shell 2 and is fixedly installed with the lifting lug 42. The lifting lug 42 is connected to the lifting rod 41, for example, by welding or thread, and the lifting rod 41 is connected to the base 1, for example, by a nut.

[0064] Specifically, in this embodiment, four hoisting components 4 are installed, including four vertically inserted hoisting rods 41 at the four corners of the base frame and hoisting lugs 42 at the top of the hoisting rods.

[0065] In addition, the reinforcement component 5 in this embodiment includes multiple layers of tie rods 51 and connecting rods 52. Each tie rod layer 51 is composed of two crisscrossing tie rods forming a grid. Both ends of each tie rod are fixedly connected to the inner shell 3. The multiple tie rod layers 51 are spaced apart along the height direction of the inner shell, that is, the tie rod layers 51 are parallel to the base 1, and the intersection points of the tie rods in the multiple tie rod layers 51 correspond one-to-one. The connecting rods 52 connect the intersection points of the multiple tie rod layers 51 in sequence to form a spatial truss structure. The end of the connecting rod 52 away from the base 1 is fixedly connected to the inner side of the top plate of the inner shell 2. Optionally, the tie rods in the reinforcement component are fixedly connected to each other and to the connecting rods by welding.

[0066] Each tie rod has multiple reinforcing ribs 511 at both ends near the inner shell side plate. One end of the reinforcing rib 511 is welded to the inner wall of the inner shell, and the other end is welded to the tie rod, forming a triangle with the tie rod and the inner shell wall.

[0067] It should be noted that the tie rods, reinforcing ribs 511, and connecting rods 52 in the reinforcing component 5 are all made of L-shaped 304 stainless steel bent parts. The thickness of the tie rods, reinforcing ribs 511, and connecting rods 52 in the reinforcing component 5 matches the thickness of the side plates of the inner shell 3.

[0068] In this embodiment, the inner shell 3 plate, which is formed in one piece and has a built-in reinforcing rib structure or folded edge structure, is combined with the internal reinforcing components 4 to form a multi-level stress system of unit reinforcement and overall composite. This makes the insulated water tank in this embodiment able to effectively resist deformation under hoisting, transportation and full load water pressure, with a large structural safety margin.

[0069] After step eight and before step nine, seal the outer shell seam at the top of the box and open foam injection holes and vent holes on the top plate of the outer shell 2.

[0070] Step 9: Fill the filling cavity and inner cavity with foam material to form an integrated insulation layer in the filling cavity and inner cavity.

[0071] In step nine, polyurethane foam material is injected into the filling cavity between the outer shell and the inner shell through the foaming injection hole and the vent hole in one go, so that it fills the inner cavity of the base 1 to form an insulation layer. After the foam material is injected and the polyurethane foam material has cured, the foaming injection hole and the vent hole are sealed. The filling cavity between the outer shell 2 and the inner shell 3 is designed to have a thickness of, for example, 50 mm, which provides strong process controllability. In this embodiment, a completely sealed foaming mold cavity is pre-constructed to avoid leakage of foaming agent from the joint between the inner shell 3 and the outer shell 2, which could contaminate the box and ensure the cleanliness and controllability of the foaming process.

[0072] Specifically, this application employs a dual-path synchronous injection device, corresponding to the injection requirements of the filling cavity and the base cavity respectively, with the injection ports precisely aligned with pre-set foaming injection holes. During the filling process, the control system of the injection device achieves synchronization of dual-path injection, ensuring that the foaming material in the filling cavity and the base cavity rises synchronously and fills evenly, avoiding uneven stress and structural deformation in the mold cavity due to excessively rapid filling on one side, while also eliminating voids and delamination phenomena caused by traditional "single-sided injection and uneven material flow".

[0073] In this embodiment, the entire foaming process is divided into three stages: The first stage: the injection pressure is controlled at 0.3MPa~0.4MPa, and the temperature in the filling cavity and inner cavity is maintained at 25℃±2℃ by the pre-embedded heating wire. The focus of this stage is to achieve rapid spreading of the foaming material and ensure that the material fills all dead corners of the mold cavity, especially the gaps of the base angle steel support steps.

[0074] In the second stage, the injection pressure is reduced to 0.15MPa~0.2MPa, and the temperature in the filling cavity and inner cavity rises to 30℃±2℃. At this time, the modified polyurethane foam material begins to expand rapidly. The low-pressure environment can avoid excessive internal stress during the foaming process and prevent cracks in the insulation layer. At the same time, the high-temperature environment accelerates the initial curing of the material and ensures that the expanded material fits tightly against the cavity wall.

[0075] Third stage: Stop the injection, maintain the temperature in the filling cavity and inner cavity at 30℃±2℃, and hold the pressure naturally for 30 minutes to allow the foaming material to fully solidify. At this time, the pressure in the filling cavity and inner cavity is slowly reduced to normal pressure to ensure the dimensional accuracy and structural integrity of the insulation layer after molding.

[0076] This embodiment employs a layer-by-layer construction of a uniform, sealed cavity from the outside in, combined with high-pressure, one-time integral foaming. This process ensures a continuous, seamless, and densely filled polyurethane insulation layer, eliminating thermal bridging and voids found in traditional processes. Furthermore, by rationally setting the spacing between the inner and outer shells and filling with high-density polyurethane in a single step, excellent and uniform insulation performance is achieved. The polyurethane insulation layer is a foam material injected and cured in one go within all the cavities enclosed by the outer shell, inner shell, angle steel, and base frame. The angle steel support steps on the base allow the polyurethane foam material to completely envelop the base, significantly improving heat dissipation in this area.

[0077] In this embodiment, the insulated water tank manufactured using the process described herein demonstrates significantly superior overall technical indicators compared to traditional products, as tested. Specifically, under conditions of 65°C water temperature and 20°C ambient temperature, the natural temperature drop over 24 hours is less than 2°C. The measured heat dissipation at the base is reduced by more than 65% compared to traditional structures, indicating excellent insulation performance of the insulated water tank in this embodiment. Furthermore, under full-load water pressure testing, the maximum deformation of the inner shell is far below the national standard limit. All welds underwent rigorous aviation kerosene leak testing and subsequent water pressure testing, showing no leakage whatsoever, demonstrating good structural strength and sealing. The insulated water tank manufactured in this embodiment also exhibits a clean and reliable appearance. Throughout the manufacturing process, sealing tape is applied to the internal seams of the outer shell, effectively preventing leakage of the foaming material. The production process is clean, controllable, and exhibits good process controllability. The manufacturing process of the insulated water tank in this embodiment solves a series of problems in traditional insulated water tanks, such as uneven insulation, foaming agent overflow during overall foaming, easy leakage at the joints, heat dissipation of the base, easy deformation of the structure, and poor appearance quality. It achieves a comprehensive improvement in the product's insulation performance, structural strength, safety and reliability, and appearance quality.

[0078] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A manufacturing process for an insulated water tank, characterized in that, include: Step 1: Make the base, creating an inner cavity inside the base; Step 2: Install the first layer of sidewalls of the outer shell. Install the multiple side panels and frame of the outer shell onto the base. The side panels of the outer shell are fixedly connected to the frame, to each other, to the base, and to the frame. Step 3: Apply sealing tape to the joints between the inner side panels and the frame, between the side panels, between the side panels and the base, and between the side panels and the frame. Step 4: Install the first layer of sidewalls of the inner shell. Fix the multiple side plates of the inner shell to the base, corresponding to the side plates of the outer shell, so that a filling cavity is reserved between the inner shell and the outer shell, and the filling cavity is connected to the inner cavity. The side plates of the inner shell are fixedly connected to each other and to the base with a sealing. Step 5: Conduct a sealing test on the inside of the first layer of the inner shell; Step Six: After the sealing test of the first layer of the inner shell is qualified, install the subsequent layers of the outer shell and inner shell from bottom to top in the manner of Step Two and Step Five, and continue the construction until the preset height of the insulated water tank is reached. Step 7: Install the top of the insulated water tank. After the side walls of the outer shell and inner shell are installed, install a top plate of the outer shell on the top layer of the outer shell side wall. Then install a top plate of the inner shell on the corresponding top plate of the outer shell. Install them alternately from the outside to the inside. Follow the order of steps 2 to 5 to stick sealing tape to the connection inside the top plate of the outer shell and perform a sealing test on the inside of the top plate of the inner shell. Step 8: Install a lifting assembly on the inner side of each of the four vertical edges of the outer shell. Each lifting assembly is perpendicular to the base and fixedly connected to the base. The lifting assemblies are used to lift the entire insulated water tank and to fix and install reinforcement assemblies in the inner cavity of the inner shell to support the inner shell. Step 9: Fill the filling cavity and inner cavity with foam material to form an integrated insulation layer in the filling cavity and inner cavity.

2. The manufacturing process of the insulated water tank according to claim 1, characterized in that, In step one, the frame of the base is welded, and angle steel is welded to its inner side to form a supporting step; two plates are taken, one of which is welded to the angle steel and leaves a gap between it and the frame to form an upper plate for installing the inner shell, and the other plate is welded to the side of the frame away from the angle steel to form a lower plate. The upper plate, the lower plate and the frame are enclosed to form an inner cavity for filling with foam material.

3. The manufacturing process of the insulated water tank according to claim 1, characterized in that, In step two, the frame includes four vertical corner brackets perpendicular to the base. Before installing the first layer of the outer shell side panels, the four vertical corner brackets are fixedly installed at the four corners of the base, so that the four vertical corner brackets are parallel to each other to form a column. After the four vertical corner brackets are installed, the multiple side panels of the first layer of the outer shell are installed between two adjacent vertical corner brackets in sequence. After step six and before step seven, the frame also includes four horizontal corner pieces perpendicular to the base. After the top side panel of the box is completed, the horizontal corner pieces are fixedly installed on the side of the top side panel of the outer shell away from the base, and the four horizontal corner pieces are respectively installed on the four sides of the outer shell and enclose to form a rectangular frame.

4. The manufacturing process of the insulated water tank according to claim 1, characterized in that, In step two, the frame includes four sets of L-shaped assembly corner plates. Each set of L-shaped assembly corner plates is formed by stamping and is composed of two mutually perpendicular side plates. When installing the first layer of the outer shell side wall, the bent edges of the four sets of L-shaped assembly corner plates are installed in sequence to correspond to the four corners of the base, so that the four sets of L-shaped assembly corner plates surround each other to form a column. Then, the side plates of the first layer of the outer shell are inserted between two adjacent L-shaped assembly corner plates to complete the installation of the first layer of the outer shell side wall. After step six and before step seven, the frame also includes four horizontal corner pieces perpendicular to the base. After the top side panel of the box is completed, the horizontal corner pieces are fixedly installed on the side of the top side panel of the outer shell away from the base, and the four horizontal corner pieces are respectively installed on the four sides of the outer shell and enclose to form a rectangular frame.

5. The manufacturing process of the insulated water tank according to claim 1, characterized in that, In step four, inside the inner shell, the side plates of the inner shell are fully welded together with each other and with the base. After step five and before step six, at least one metal connecting piece is welded between each side plate of the inner shell and the corresponding side plate of the outer shell. And in step seven, at least one metal connecting piece is welded between each top plate of the inner shell and the corresponding top plate of the outer shell.

6. The manufacturing process of the insulated water tank according to claim 1, characterized in that, If there is a pipe interface requirement on the first side wall of the enclosure, then after step four and before step five, holes are made at the corresponding positions on the outer shell and the inner shell according to the preset positions. Then, a stainless steel transition pipe with the appropriate interface type is inserted from the outside. The end of the stainless steel transition pipe near the inner shell is fully welded to the inner shell. Then, the stainless steel transition pipe is spot welded to the contact point with the outer shell and sealant is applied.

7. The manufacturing process of the insulated water tank according to claim 1, characterized in that, In step five, the airtightness of the inner shell is tested using aviation kerosene leakage detection. Aviation kerosene is applied to the back side of the inner shell weld, and the welded side of the inner shell weld is observed for kerosene wetting. If no kerosene wetting is observed on the welded side of the inner shell weld, it can be confirmed that there is no leakage in this layer of the inner shell weld.

8. The manufacturing process of the insulated water tank according to claim 1, characterized in that, In step seven, the last pair of top plates installed on the top of the outer shell and the top of the inner shell are both inspection plates with inspection holes, and the inspection holes on the inspection plates are connected to the internal cavity of the inner shell.

9. The manufacturing process of the insulated water tank according to claim 3 or 4, characterized in that, In step eight, the hoisting assembly consists of a hoisting rod and a lifting lug. The hoisting rod is installed in the vertical edge corner piece. One end of the hoisting rod is fixedly connected to the base, and the other end of the hoisting rod passes through the top of the outer shell and is equipped with a lifting lug. The reinforcement component includes multiple layers of tie rods and connecting rods. Each tie rod layer consists of two crisscrossing tie rods forming a grid. Both ends of each tie rod are fixedly connected to the inner shell. The multiple tie rod layers are spaced apart along the height direction of the inner shell, and the intersection points of the tie rods in the multiple tie rod layers correspond one-to-one. The connecting rods connect the intersection points of the multiple tie rod layers in sequence to form a spatial truss structure. The end of the connecting rod away from the base is fixedly connected to the inner side of the top plate of the inner shell. Each tie rod has multiple reinforcing ribs at both ends near the inner shell side plate. One end of the reinforcing rib is connected to the inner wall of the inner shell, and the other end is connected to the tie rod, forming a triangle with the tie rod and the inner shell wall. After step eight and before step nine, seal the outer shell seam at the top of the box and open foam injection holes and vent holes on the top plate of the outer shell; In step nine, polyurethane foam material is injected into the filling cavity between the outer shell and the inner shell through the foaming injection hole and the vent hole in one go, so that it fills the inner cavity of the base to form a heat insulation layer. After the foam material is injected, the foaming injection hole and the vent hole are sealed after the polyurethane foam material has cured.

10. The manufacturing process of the insulated water tank according to claim 1, characterized in that, The side and top plates of the outer shell, as well as the side and top plates of the inner shell, are all made of stainless steel stamping plates, which are formed in one piece by special molds to form a structure with reinforcing ribs, bosses or folded edges.

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