A vertical double-layer belt ballast pump shell manufacturing process and structure thereof

Abstract

The application discloses a vertical double-layer belt weight pump shell manufacturing process and structure, and comprises the following steps: rolling an inner liner and an outer liner, manufacturing an inner liner bottom flange and an inner liner upper flange, and manufacturing an outer liner base; the inner liner and the outer liner are spliced and assembled; a water inlet pipe and a water outlet pipe are manufactured, the water inlet pipe and the water outlet pipe are corrected by using an old pump shell sample; the water inlet pipe and the water outlet pipe are installed on the outer liner, and the water inlet pipe and the water outlet pipe are communicated with a water cavity. The application aims at solving the problems that new cracks generated in the matching of a new pump shell and an old pump shell and the repair of an old shell body cannot be repaired.

Description

Technical Field

[0001] This invention belongs to the field of ship maintenance technology and relates to a manufacturing process and structure of a vertical double-layer ballast pump casing. Background Technology

[0002] Stainless steel is widely used in various parts of ships because it does not rust and is easy to maintain. However, stainless steel also has its drawbacks. After a certain period of use, it will develop intergranular corrosion and fatigue cracks. Because of its rust-free properties, people will visually believe that it is in very good condition. Cracks in some components can be repaired by welding. However, stainless steel equipment and facilities that are constantly immersed in seawater will suffer from intergranular corrosion and fatigue. We cannot judge its fatigue and corrosion with the naked eye. For example, seawater filters, pump casings, water tanks and other components that come into contact with seawater.

[0003] New leaks may occur during the repair of the pump casing. The only solution is to make a new pump casing. However, pump casings are usually manufactured using casting, forging and other processing techniques. From a maintenance perspective, it is too expensive and complicated to make a pump casing with the same dimensions as the old one and be compatible with other components. Summary of the Invention

[0004] This invention provides a manufacturing process and structure for a vertical double-layer ballast pump casing, aiming to solve the problem of matching new and old pump casings and completely repairing the high cost of pump casing manufacturing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A manufacturing process for a vertical double-layer ballast pump casing includes the following steps: rolling an inner liner and an outer liner; fabricating a bottom flange and an upper flange for the inner liner; fabricating a base for the outer liner; assembling the inner liner and the outer liner together to form a water cavity between them; fabricating an inlet pipe and an outlet pipe; using an old pump casing as a template to correct the inlet pipe and the outlet pipe; and installing the inlet pipe and the outlet pipe on the outer liner, with the inlet pipe and the outlet pipe connecting to the water cavity.

[0006] Preferably, the rolling of the inner liner and the outer liner includes: rolling a stainless steel sheet to manufacture an inner liner and an outer liner respectively, wherein the height and diameter of the inner liner are smaller than the height and diameter of the outer liner; welding the joints and composite dimensions after rolling, and re-rolling to shape the inner liner and the outer liner.

[0007] Preferably, the manufacturing of the inner liner bottom flange and the inner liner top flange, and the manufacturing of the outer liner base, includes: cutting the inner liner bottom flange from a stainless steel plate; cutting the inner liner top flange from a stainless steel plate; rough machining the inner liner bottom flange and the inner liner top flange, and machining positioning grooves on the contact surfaces of the inner liner bottom flange and the inner liner top flange that need to contact the inner liner; the bottom of the inner liner is inserted into the inner liner bottom flange through the positioning groove and fixedly connected thereto; the upper end of the inner liner is inserted into the inner liner top flange through the positioning groove and fixedly connected thereto; cutting the outer liner base from a stainless steel plate, machining process holes on the outer liner base, and machining positioning grooves on the contact surfaces of the outer liner base that need to contact the outer liner; and inserting one side of the outer liner into the outer liner base through the positioning groove and fixedly connecting thereto.

[0008] Preferably, the assembly of the inner liner and the outer liner includes: hoisting the entire inner liner into the outer liner, connecting the baseless end of the outer liner to the flange on the inner liner to form the overall ballast pump housing; forming a water cavity between the inner liner and the outer liner; after the inner liner and the outer liner are fixed, flipping the overall ballast pump housing and installing a reinforcing strip between the inner liner and the outer liner.

[0009] Preferably, the process involves fabricating an inlet pipe and an outlet pipe, using an old pump casing as a template to correct the inlet pipe and the outlet pipe; installing the inlet pipe and the outlet pipe on the outer liner, with the inlet pipe and the outlet pipe communicating with the water cavity, including: fabricating an outlet pipe and a U-shaped inlet pipe; matching and calibrating the inlet and outlet of the spliced ​​outer liner with the inlet and outlet of the old pump casing, removing the inlet and outlet of the old pump casing after calibration; and drilling holes according to the calibration position on the outer liner, installing the outlet pipe and the U-shaped inlet pipe at the calibration position.

[0010] Preferably, the step of drilling holes at the positions of the outer liner after calibration and installing the water outlet pipe and the U-shaped water inlet pipe at the calibration positions includes: determining the specific position of the installation port of the U-shaped water inlet pipe on the outer liner according to the calibration position; imprinting the U-shape on the outer liner with a stone pencil and drawing lines; cutting out the installation port imprinted on the outer liner with a plasma cutter to connect to the water cavity; after cutting, inserting the U-shaped water inlet pipe into the outer liner at the calibration position to fix the U-shaped water inlet pipe and the outer liner in place.

[0011] Preferably, the step of drilling holes at the positions specified in the outer liner after calibration and installing the water outlet pipe and the U-shaped water inlet pipe at the calibrated positions includes: determining the specific position of the installation port of the water outlet pipe on the outer liner according to the calibration position; using a stone pencil to imprint the shape of the water outlet pipe on the outer liner and draw lines; using a plasma cutter to cut out the installation port imprinted on the outer liner and connect it to the inner liner; after cutting, inserting the water outlet pipe into the outer liner and the inner liner at the calibration position and fixing the water outlet pipe to the outer liner and the inner liner.

[0012] Preferably, after the inlet pipe and the outlet pipe are installed on the outer liner, the process hole sealing plate is further manufactured, including: cutting a sealing plate of corresponding size from a stainless steel plate according to the size of the process hole, and setting a reinforcing plate on the sealing plate; after the sealing plate is manufactured, the side with the reinforcing plate faces inward to the outer liner, the sealing plate seals the process hole, and the sealing plate is fixedly connected to the outer liner base.

[0013] A vertical double-layer ballast pump casing structure is disclosed. The casing structure, manufactured using pump casing processing technology, includes an outer liner, an inner liner, an inlet pipe, and an outlet pipe. An outer liner base is located at the bottom of the outer liner, and a sealing plate is fixedly connected to the outer liner base. The inlet pipe and the outlet pipe are respectively located at the side ends of the outer liner. An upper flange is located on the upper side of the inner liner, and a bottom flange is located on the lower side of the inner liner. The inner liner extends into the outer liner, and the upper flange of the inner liner is fixedly connected to the baseless end of the outer liner.

[0014] Preferably, a reinforcing strip is provided between the bottom flange of the inner liner and the inner wall of the outer liner, and the two sides of the reinforcing strip are fixedly connected to the bottom flange of the inner liner and the inner wall of the outer liner, respectively.

[0015] The beneficial effects of this invention are as follows: By using the process method described in this application, the pump casing is divided into multiple parts, and then decomposed, modeled, and assembled piece by piece to replicate it. This completely solves the problem of irreparable damage caused by material deterioration leading to further cracking after repairs. A complex vertical double-layered ballast pump casing with a water chamber is replicated using casting. The use of an old casing as a template ensures the matching between the old equipment and the new pump casing, addressing issues such as the connection of the inlet and outlet flanges with the ship's piping. This repair process can solve the problems of incompatibility between newly manufactured standard pump casings and old pumps, and the irreparable damage caused by repairs to the old casing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the steps of the present invention.

[0017] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0018] Figure 3This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 4 This is another structural schematic diagram of the present invention.

[0020] The labels on the attached drawings are explained as follows: 1-Outer tank; 2-Inner tank; 3-Inlet pipe; 4-Outlet pipe; 5-Outer tank base; 6-Inner tank upper flange; 7-Inner tank bottom flange; 8-Reinforcing strip; 9-Sealing plate. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. It should be understood that this application is not limited to the exemplary embodiments disclosed herein. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In the embodiments of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] This invention provides an appendix Figures 1-2In this embodiment of the invention, a manufacturing process for a vertical double-layer ballast pump casing is described, using 316L stainless steel to enhance the ballast pump's corrosion and fatigue resistance. The welding method is TIG, the welding material is 316L, and the protective gas is argon. The process includes the following steps: S1. Roll the inner liner 2 and the outer liner 1, make the bottom flange 7 and the top flange 6 of the inner liner, and make the base 5 of the outer liner; The process of rolling the inner liner 2 and the outer liner 1 includes: rolling an inner liner 2 and an outer liner 1 separately using stainless steel plates, wherein the height and diameter of the inner liner 2 are smaller than the height and diameter of the outer liner 1; welding the joints and composite dimensions after rolling, and then re-rolling to shape the inner liner 2 and the outer liner 1.

[0026] Specifically, using a 6mm thick stainless steel plate, an inner liner 2 with a height of 400mm and a diameter of 410mm and an outer liner 1 with a height of 455mm and a diameter of 485mm are rolled. A water cavity is formed according to the size and structural space of the inner liner 2 and the outer liner 1. After rolling, the dimensions are checked, the joints are welded together, and then the plates are rolled again. The purpose is to roll the two circles as round as possible to avoid elliptical shapes affecting subsequent assembly.

[0027] Fabricating the inner liner bottom flange 7 and inner liner top flange 6, and the outer liner base 5, includes: cutting the inner liner bottom flange 7 with an outer diameter of 430mm from a stainless steel plate; cutting the inner liner top flange 6 with an outer diameter of 580mm from a stainless steel plate; rough machining the inner liner bottom flange 7 and inner liner top flange 6; machining positioning grooves on the contact surfaces of the inner liner bottom flange 7 and inner liner top flange 6 that need to contact the inner liner 2; inserting the bottom of the inner liner 2 into the inner liner bottom flange 7 through the positioning groove and fixing it thereto; inserting the top end of the inner liner 2 into the inner liner top flange 6 through the positioning groove and fixing it thereto; cutting the outer liner base 5 with a side length of 550mm from a stainless steel plate; machining process holes on the outer liner base 5; machining positioning grooves on the contact surfaces of the outer liner base 5 that need to contact the outer liner 1; inserting one side of the outer liner 1 into the outer liner base 5 through the positioning groove and fixing it thereto.

[0028] Specifically, a 35mm thick stainless steel plate is selected and cut into a flange with an outer diameter of 430mm or an inner diameter of 420mm, namely the bottom flange 7 of the inner liner. Then, rough machining is performed (machine the stop, drill holes and tap). In order to better position the inner liner 2 on the center line of this flange, a positioning groove with a diameter of 410mm is machined on this flange according to the size of the inner liner 2. After inserting the inner liner 2 into the groove of the flange, it is welded. In this way, the inner liner 2 is accurately positioned at the center point of the flange. The purpose is to ensure that the subsequent pump impeller does not scrape against the inner liner 2.

[0029] Specifically, a 40mm thick stainless steel plate is selected and cut into a flange with an outer diameter of 580mm or an inner diameter of 400mm, namely the inner liner upper flange 6, which is also the motor seat when installing the pump wheel. Then, rough machining is performed (machined stop, drilled and tapped). In order to better ensure that the bottom flange and the upper flange are on the same center line, a positioning groove with a diameter of 410mm is also machined on this upper flange according to the size of the inner liner 2. Then, the other end of the inner liner 2 is turned upside down and inserted into the positioning groove of the flange and then welded. This ensures that the bottom flange and the upper flange of the entire inner liner 2 are concentric.

[0030] Specifically, a 550mm cube is cut from a 25mm thick stainless steel plate to serve as the outer base 5 of the pump casing. After dividing the center line of this base plate, a 465mm diameter process hole is drilled according to the diameter of the outer liner 1. The purpose of the process hole is to facilitate machining from the bottom for precision finishing, such as precision machining of the height between the two flanges of the inner liner 2, and the assembly and welding of the reinforcing plate on the bottom flange 7 of the inner liner. Afterwards, reinforcing ribs are added to the bottom of the inner liner 2 and then it is sealed. Then, a mounting hole is drilled at each of the four corners of this base plate, and the outer liner 1 is evenly assembled into this base and then welded. For evenness and ease of assembly, a 485mm diameter positioning groove is also machined, similar to that of the upper flange.

[0031] S2. The inner liner 2 and the outer liner 1 are spliced ​​and assembled, forming a water cavity between the inner liner and the outer liner; The inner tank 2 and the outer tank 1 are assembled, including: hoisting the entire inner tank 2 into the outer tank 1, connecting the baseless end of the outer tank 1 to the flange 6 on the inner tank to form the overall ballast pump casing; forming a water cavity between the inner tank 2 and the outer tank 1; after the inner tank 2 and the outer tank 1 are fixed, flipping the overall ballast pump casing and installing a reinforcing strip 8 between the inner tank 2 and the outer tank 1.

[0032] Specifically, the entire inner tank 2 is lifted and placed inside the outer tank 1, ensuring a tight seal between the baseless end of the outer tank 1 and the bottom of the upper flange of the inner tank 2. This forms the overall ballast pump casing. The space between the inner tank 2 and the outer tank 1 creates a water cavity, and the bottom of the inner tank 2 and the outer tank 1 forms a step, thus creating a water storage tank. After assembly and spot welding, the entire casing is turned upside down. At the bottom step area of ​​the inner tank 2 and the outer tank 1, four H10x40x50 stainless steel reinforcing plates are used to equally reinforce the walls of the inner tank 2 and the outer tank 1. Then, the weld seams are performed, completing the fabrication of the entire casing. After welding, the inner tank 2 is precision machined according to the dimensions of the pump impeller.

[0033] S3. Make inlet pipe 3 and outlet pipe 4, and use the old pump casing to correct inlet pipe 3 and outlet pipe 4; Fabricate inlet pipe 3 and outlet pipe 4, and use an old pump casing as a template to correct inlet pipe 3 and outlet pipe 4; install inlet pipe 3 and outlet pipe 4 on outer tank 1, with inlet pipe 3 and outlet pipe 4 connecting to the water cavity, including: Make water outlet pipe 4 and U-shaped water inlet pipe 3; such as Figure 4 As shown, the outlet pipe 4 is a conventional circular pipe, and the inlet pipe 3 is a U-shaped inlet pipe. The inlet water must be greater than the outlet water to prevent the pipe from running dry.

[0034] Match and calibrate the spliced ​​outer liner 1 with the inlet and outlet of the old pump casing. After calibration, remove the inlet and outlet of the old pump casing. Based on the position of the outer liner 1 after calibration, the water outlet pipe 4 and the U-shaped water inlet pipe 3 are installed in the position after calibration.

[0035] Specifically, firstly, the inlet pipe 3 is made using a stainless steel plate with a thickness of 6mm x 460mm x 150mm. A U-shaped inlet pipe 3 is pressed using a special tooling. After it is made, a plate is placed on top of the U-shaped pipe to seal the opening and weld it. The inlet should be larger than the outlet to ensure the flow rate of the ballast pump. Then, a stainless steel plate with a thickness of 25mm x 240mm x 240mm is cut, and a mounting hole is drilled at each of the four corners to serve as the connecting flange for the inlet. A hole is drilled at the center of the connecting flange plate according to the U-shaped dimensions for connection and welding. Then, a stainless steel pipe is used to connect and weld to a stainless steel flange to serve as the outlet pipe 4.

[0036] After the inner liner 2 is precision machined, the entire pump casing is hoisted onto the platform for calibration. After being placed on the platform, screws are first welded and positioned in the four mounting holes on the base plate. Then, the U-shaped inlet pipe 3 and outlet pipe 4 are calibrated. The inlet and outlet are connected with flanges and screws are fastened. Then, L40x40mm angle steel is used to weld and fix the calibration flanges, and diagonal supports are used to tighten them to ensure that they will not shift.

[0037] Based on the position drilled after calibration of the outer liner 1, the water outlet pipe 4 and the U-shaped water inlet pipe 3 are installed in the calibrated position, including: Based on the location of the calibration sample, determine the specific position of the installation port of the U-shaped water inlet pipe 3 on the outer tank 1, and use a stone pencil to imprint the U-shape on the outer tank 1 and draw the lines. Use a plasma cutter to cut out the mounting opening printed on the outer tank 1 and connect it to the water cavity; After cutting, insert the U-shaped water inlet pipe 3 into the outer tank 1 at the installation and calibration position, and fix the U-shaped water inlet pipe 3 and the outer tank 1 in place.

[0038] Based on the position drilled after calibration of the outer liner 1, the water outlet pipe 4 and the U-shaped water inlet pipe 3 are installed in the calibrated position, including: According to the location of the proof, determine the specific position of the installation port of the water outlet pipe 4 on the outer tank 1, and use a stone pencil to imprint the shape of the water outlet pipe 4 on the outer tank 1 and draw lines. Use a plasma cutter to cut out the mounting opening printed on the outer liner 1 and connect it to the inner liner 2; After cutting, insert the water outlet pipe 4 into the outer tank 1 and inner tank 2 at the installation and calibration position, and fix the water outlet pipe 4 to the outer tank 1 and inner tank 2.

[0039] Specifically, after the calibration is completed, the screws of the inlet and outlet pipes are removed and the old sample is lifted out. The new pump casing is lifted into the calibration area, and the planting screws of the calibration base are inserted into the mounting holes of the new pump casing base. The inlet pipe 3 and outlet pipe 4 of the newly made pump casing are then assembled into their corresponding positions. First, based on the location of the calibration sample, determine the specific position of the newly manufactured water inlet on the new shell. Use a stone pencil to imprint the U-shaped shape on the new shell and draw the lines. Use a plasma cutter to cut out the water inlet hole imprinted on the new shell. The shell has two layers, namely the outer liner 1 and the inner liner 2. The water inlet pipe 3 only connects to the outer liner 1 and does not pass through the inner liner 2. That is to say, the water inlet connects to the outer cavity wall and only connects to the water cavity. Just cut through the water cavity. After cutting the hole, insert the water inlet of the newly manufactured pump shell into the shell according to the location of the calibration sample. Connect the flange end to the calibration flange with screws and then weld.

[0040] The outlet is also positioned on the new shell according to the calibration sample. The position of the outlet is traced on the new shell with a stone pencil and the line is drawn. The outlet hole is cut out on the new shell using a plasma cutter. The outlet pipe 4 leads to the inner layer of the inner liner 2, that is, the outlet connects to the inner cavity wall. If the straightness between the two layers of holes cannot be guaranteed by manual cutting, a machining boring machine is needed to process this double-walled outlet to avoid the pipe opening being crooked and unable to be connected during installation on the ship. After the outlet hole is opened, the outlet pipe 4 of the newly made pump shell is inserted into the shell according to the calibration sample position. The flange end is connected to the calibration sample flange with screws and then welded.

[0041] S4. Install the inlet pipe 3 and the outlet pipe 4 on the outer liner 1, and connect the inlet pipe 3 and the outlet pipe 4 to the water chamber.

[0042] After the inlet pipe 3 and outlet pipe 4 are installed on the outer tank 1, the process hole sealing plate 9 is also made, including: cutting the sealing plate 9 of the corresponding size from the stainless steel plate according to the size of the process hole, and setting the reinforcing plate on the sealing plate 9; after the sealing plate 9 is made, the side with the reinforcing plate is placed inside the outer tank 1, the sealing plate 9 seals the process hole, and the sealing plate 9 and the outer tank base 5 are fixedly connected.

[0043] Specifically, after all the inlet and outlet pipes and flanges are welded, the entire pump casing is turned upside down. Then, according to the process hole size of the base plate, a 465mm diameter sealing plate 9 is cut from a 6mm stainless steel plate, and a reinforcing plate is installed on the sealing plate 9. That is, two H6x50mmx465mm stainless steel flat strips are cut, reinforced in a cross shape and welded. After the sealing plate 9 is manufactured, the reinforcing side of the sealing plate 9 is turned inward, and the process hole is sealed and welded.

[0044] A vertical double-layer ballast pump casing structure is disclosed. The casing structure, manufactured using pump casing processing technology, includes an outer liner 1, an inner liner 2, an inlet pipe 3, and an outlet pipe 4. An outer liner base 5 is located at the bottom of the outer liner 1, and a sealing plate 9 is fixedly connected to the outer liner base 5. The inlet pipe 3 and outlet pipe 4 are respectively located at the side ends of the outer liner 1. An upper flange 6 is located on the upper side of the inner liner 2, and a bottom flange 7 is located on the lower side of the inner liner 2. The inner liner 2 extends into the outer liner 1, and the upper flange 6 is fixedly connected to the baseless end of the outer liner 1. A reinforcing strip 8 is provided between the bottom flange 7 of the inner liner and the inner wall of the outer liner 1, with both sides of the reinforcing strip 8 fixedly connected to the bottom flange 7 of the inner liner and the inner wall of the outer liner 1, respectively. The method of decomposition modeling and assembly is used to replicate the cast shell. The replacement material improves the intergranular corrosion and fatigue life of these components that are constantly immersed in seawater. The positioning groove makes the upper and lower flanges of the inner tank 2 concentric. The size and different shape of the water holes ensure its flow rate. The gap and steps between the inner tank 2 and the outer tank 1 are used as water chambers and water storage pools to alleviate the air bubbles generated by the rapid flow of water in and out, which affect the unstable operation of the pump impeller. The construction of the bottom process hole and the steps is conducive to improving the working efficiency and drainage efficiency of the ballast pump impeller.

[0045] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A manufacturing process for the pump casing of a vertical double-layer ballast pump, characterized in that, Includes the following steps: Roll the inner and outer liner, make the bottom flange and top flange of the inner liner, and make the base of the outer liner; The inner liner and the outer liner are spliced ​​and assembled, and a water cavity is formed between the inner liner and the outer liner; Fabricate inlet and outlet pipes, and use an old pump casing as a template to correct the inlet and outlet pipes; The inlet pipe and the outlet pipe are installed on the outer liner, and the inlet pipe and the outlet pipe are connected to the water cavity; The process includes fabricating an inlet pipe and an outlet pipe, using an old pump casing as a template to correct the inlet pipe and the outlet pipe, and installing the inlet pipe and the outlet pipe on the outer liner, with the inlet pipe and the outlet pipe communicating with the water cavity. Make the water outlet pipe and the U-shaped water inlet pipe; The spliced ​​outer liner and the inlet and outlet of the old pump casing are matched and calibrated. After the calibration is completed, the inlet and outlet of the old pump casing are removed. According to the position drilled after the outer liner was calibrated, the water outlet pipe and the U-shaped water inlet pipe are installed in the calibrated position; including: According to the location of the calibration sample, determine the specific position of the installation port of the U-shaped water inlet pipe on the outer tank, and use a stone pencil to imprint the U-shape on the outer tank and draw lines. Use a plasma cutter to cut out the mounting opening imprinted on the outer liner and connect it to the water cavity; After cutting, insert the U-shaped water inlet pipe into the outer liner at the installation and calibration position, and fix the U-shaped water inlet pipe and the outer liner in place; According to the location of the calibration sample, determine the specific position of the water outlet on the outer liner, and use a stone pencil to imprint the shape of the water outlet on the outer liner and draw lines. Use a plasma cutter to cut out the mounting opening imprinted on the outer liner and connect it to the inner liner; After cutting, insert the water outlet pipe into the outer tank and the inner tank at the installation and calibration position, and fix the water outlet pipe to the outer tank and the inner tank.

2. The manufacturing process of the pump casing for a vertical double-layer ballast pump according to claim 1, characterized in that, The rolled inner and outer liner include: An inner liner and an outer liner are respectively manufactured by rolling stainless steel sheet, wherein the height and diameter of the inner liner are smaller than the height and diameter of the outer liner; After rolling, the joints are welded together and the composite dimensions are determined. The inner and outer liner are then re-rolled to reshape them.

3. The manufacturing process of the pump casing of a vertical double-layer ballast pump according to claim 1, characterized in that, The process of fabricating the bottom flange and top flange of the inner liner, and the outer liner base includes: Cut the bottom flange of the inner liner out of the stainless steel plate; Cut the inner flange out of the stainless steel plate; Rough machining is performed on the bottom flange and the top flange of the inner liner, and positioning grooves are machined on the contact surfaces of the bottom flange and the top flange of the inner liner that need to contact the inner liner. The bottom of the inner liner is inserted into the bottom flange of the inner liner through a positioning groove and fixedly connected thereto; The upper end of the inner liner is inserted into the upper flange of the inner liner through a positioning groove and fixedly connected thereto. Cut the outer liner base out of the stainless steel plate, process holes are machined on the outer liner base, and positioning grooves are machined on the contact surface of the outer liner base that needs to contact the outer liner. One side of the outer liner is inserted into the outer liner base through a positioning groove and fixedly connected to it.

4. The manufacturing process of the pump casing of a vertical double-layer ballast pump according to claim 3, characterized in that, The inner liner and the outer liner are assembled together, including: The entire inner liner is hoisted into the outer liner, and the baseless end of the outer liner is connected to the flange on the inner liner to form the ballast pump casing assembly. A water cavity is formed between the inner liner and the outer liner; After the inner liner and the outer liner are fixed, the ballast pump casing is flipped over as a whole, and a reinforcing strip is installed between the inner liner and the outer liner.

5. The manufacturing process of the pump casing of a vertical double-layer ballast pump according to claim 3, characterized in that, After installing the inlet pipe and the outlet pipe on the outer tank, the process hole sealing plate is also included, comprising: According to the size of the process hole, a sealing plate of corresponding size is cut out from the stainless steel plate, and a reinforcing plate is set on the sealing plate; After the sealing plate is manufactured, the side with the reinforcing plate is placed inside the outer liner. The sealing plate seals the process hole, and the sealing plate and the outer liner base are fixedly connected.

6. A pump casing structure for a vertical double-layer ballast pump, wherein the pump casing structure is manufactured using the pump casing processing technology of any one of claims 1 to 5, characterized in that: Includes outer tank, inner tank, inlet pipe, and outlet pipe; The bottom of the outer liner is provided with an outer liner base, and the outer liner base is provided with a sealing plate and fixedly connected thereto; The inlet pipe and the outlet pipe are respectively located on the side of the outer liner; The inner liner is provided with an upper flange on the upper side and an inner liner is provided with a bottom flange on the lower side of the inner liner. The inner liner extends into the outer liner, and the flange on the inner liner is fixedly connected to the baseless end of the outer liner.

7. The pump casing structure of a vertical double-layer ballast pump according to claim 6, characterized in that, A reinforcing strip is provided between the bottom flange of the inner liner and the inner wall of the outer liner, and the two sides of the reinforcing strip are fixedly connected to the bottom flange of the inner liner and the inner wall of the outer liner, respectively.

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