Dismounting tool for open impeller of centrifugal pump

Abstract

The invention relates to the technical field of centrifugal pump maintenance, in particular to a disassembling tool for an open impeller of a centrifugal pump. The clamping columns are distributed in the circumferential direction of the chuck, the clamping columns can be independently and movably arranged on the chuck in the radial direction of the chuck, each clamping column is provided with a clamping section used for making contact with the side face of a blade of the open impeller, and the clamping sections are provided with non-metal protection gaskets; the locking mechanism is used for independently locking the clamping columns at different radial positions on the chuck; and the handle is fixedly connected with the chuck. Therefore, the problems that in the prior art, operation is inconvenient, disassembly is difficult, key components are prone to being damaged, and potential safety hazards exist in the disassembly scheme of the open impeller mechanism of the centrifugal pump are solved.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump maintenance technology, specifically to a disassembly tool for an open impeller of a centrifugal pump. Background Technology

[0002] Due to their structural characteristics, open impeller mechanisms in centrifugal pumps can achieve high conveying efficiency under high-speed conditions and are widely used in industries such as petrochemicals and energy power. Currently, the open impeller and induced impeller of this type of pump are usually mounted on the shaft by means of threads or other fasteners. During operation, the centrifugal force and axial force generated by high-speed rotation create a self-tightening effect between the impeller and related mating parts. While this self-tightening effect helps ensure structural stability and sealing during operation, it also makes disassembly work difficult during regular maintenance or replacement due to malfunctions.

[0003] Existing disassembly methods generally rely on a single, fixed disassembly point pre-designed by the pump manufacturer during the assembly phase. This point is typically located in the narrow gap between the open impeller and the induced impeller, and it is the only stress point on the entire pump. During actual disassembly, operators must use specialized or general-purpose tools (such as wrenches or pullers) to apply a reverse torque or pulling force to the impeller to overcome its self-tightening force. However, due to the clamping force of the mating surfaces after high-speed operation, the disassembly torque provided by a single stress point is often insufficient, making it difficult to loosen the impeller.

[0004] To complete disassembly, on-site maintenance personnel are often forced to use unconventional methods such as using extended levers, hammering, and forceful prying. These methods have drawbacks: First, concentrated and excessive local stress can easily cause plastic deformation, cracks, or chipping of precision components such as open impeller blades, hubs, or induced impellers, severely affecting the impeller's aerodynamic performance and dynamic balance accuracy, resulting in decreased pump efficiency and increased vibration. Second, when using extended tools in confined spaces, accidents such as tool slippage and sudden component breakage are prone to occur, threatening the personal safety of operators, and resulting in frequent workplace injuries. Third, if a single disassembly point becomes worn or deformed due to repeated disassembly, its reliability will be further reduced, or it may even lose its disassembly function, leading to the scrapping of the entire rotor assembly.

[0005] Therefore, existing disassembly methods for open impeller mechanisms in centrifugal pumps suffer from inconvenient operation, difficult disassembly, easy damage to key components, and safety hazards. Thus, there is an urgent need to optimize and improve the structure of current disassembly tools to facilitate force application, effectively distribute the disassembly load, protect the integrity of components, and ensure operational safety. Summary of the Invention

[0006] The purpose of this invention is to provide a disassembly tool for open impellers of centrifugal pumps, so as to solve the problems of inconvenient operation, difficult disassembly, easy damage to key components, and safety hazards in the disassembly scheme of open impeller mechanism of centrifugal pumps in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A disassembly tool for an open impeller of a centrifugal pump, comprising:

[0009] Chuck;

[0010] Multiple locking pins are distributed circumferentially along the chuck, and each locking pin is independently movable on the chuck along the radial direction of the chuck. Each locking pin has a locking section for contacting the side of the blade of the open impeller, and the locking section is provided with a non-metallic protective gasket.

[0011] A locking mechanism for independently locking each of the said locking pins at different radial positions on the chuck; and,

[0012] The handle is fixedly connected to the chuck.

[0013] Alternatively, the inner diameter of the chuck is larger than the outer diameter of the inducer of the centrifugal pump to be disassembled, and its outer diameter is smaller than the outer diameter of the open impeller to be disassembled.

[0014] Alternatively, the locking mechanism includes a plurality of strip-shaped holes on the chuck and a plurality of locking members corresponding to each of the strip-shaped holes, wherein the length direction of each strip-shaped hole extends radially along the chuck.

[0015] The locking pin passes through the corresponding waist-shaped hole and is locked and fixed to the chuck by a locking member.

[0016] Alternatively, the locking element is a screw, and the locking post is provided with a threaded hole that mates with the screw.

[0017] Alternatively, the locking post includes an integrally formed insertion section, a pressing section, and a retaining section. The insertion section is used to insert into the waist-shaped hole and connect to the locking member. The pressing section is larger than the waist-shaped hole to press against the chuck. The retaining section is provided with the protective pad.

[0018] Alternatively, the insertion segment is elongated, with its long side larger than the diameter of the oblong hole and its short side smaller than the diameter of the oblong hole, so that the insertion segment can only move along the length of the oblong hole within the oblong hole.

[0019] Alternatively, the protective liner may be made of polyvinylidene fluoride or nylon.

[0020] Alternatively, the protective liner can be detachably installed on the retaining section of the locking post.

[0021] Alternatively, the number of the chucks may be at least three, and they may be evenly distributed around the circumference of the chuck.

[0022] Alternatively, the handle is welded to the chuck.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] Through the aforementioned technical solution, based on multiple independently adjustable and lockable locking pins, the disassembly force point can be transformed from a single, inconveniently located shaft groove point to multiple points distributed along the outer circumference of the impeller. This multi-point, uniform force distribution reduces the risk of tool slippage or sudden component failure due to localized stress concentration during operation, improving the safety of disassembly operations and effectively preventing personnel injury. The design of the locking pins, which can move and lock independently along the radial direction, allows the tool to flexibly adapt to impellers with different manufacturing tolerances or minor wear conditions, ensuring effective contact between each locking section and the blade side, enhancing the tool's versatility and reliability.

[0025] The uniform force distribution pattern formed by multiple clamping pins avoids impeller deformation, hub cracking, or pump shaft damage caused by using tools such as pry bars at a single point of force. The non-metallic protective gasket on the clamping section creates a soft contact interface between the clamping pins and the metal surface of the blades, effectively preventing scratches, indentations, or chipping on the blade surface during clamping and force application. This protects the impeller's aerodynamic profile and dynamic balance accuracy, thus ensuring the impeller's reuse efficiency after disassembly. The tool mainly consists of a ring-shaped chuck, clamping pins, a locking mechanism, and a handle. Its simple and reliable structure, along with easily manufactured and inexpensive components, makes it suitable for widespread use in industrial field maintenance environments. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0027] Figure 1 This is a cross-sectional view of the open impeller of a centrifugal pump to which this invention applies. Other structures, such as seals, are not shown in the figure because they are not related to this invention.

[0028] Figure 2This is a top view of the open impeller of a centrifugal pump to which this invention applies. Other structures, such as seals, are not shown in the figure because they are not related to this invention.

[0029] Figure 3 This is a cross-sectional view of the disassembly tool for an open impeller of a centrifugal pump provided by the present invention during impeller disassembly.

[0030] Figure 4 This is a top view of the disassembly tool for an open impeller of a centrifugal pump provided by the present invention during the disassembly of the impeller.

[0031] Figure 5 This is a schematic diagram of the chuck and locking pin in the disassembly tool for an open impeller of a centrifugal pump provided by the present invention;

[0032] Figure 6 This is a schematic diagram of the assembly structure of the chuck and the locking pin in the disassembly tool for the open impeller of a centrifugal pump provided by the present invention;

[0033] Figure 7 This is a schematic diagram of the chuck structure in the disassembly tool for an open impeller of a centrifugal pump provided by the present invention;

[0034] Figure 8 This is a schematic diagram of the clamping pin structure in the disassembly tool for the open impeller of a centrifugal pump provided by the present invention.

[0035] The attached diagram shows the following markings and corresponding component names: 1-Chuck, 2-Clip, 20-Threaded hole, 21-Plug-in section, 22-Pressure section, 23-Holding section, 31-Oval hole, 32-Locking component, 4-Handle, 5-Protective gasket, 6-Impeller, 7-Inducer wheel. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that while the description of these embodiments is intended to aid in understanding the invention, it does not constitute a limitation thereof. The specific structural and functional details disclosed herein are only for describing exemplary embodiments of the invention. However, the invention can be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0037] According to a specific embodiment of this disclosure, a disassembly tool for an open impeller of a centrifugal pump is provided. Wherein, Figures 1 to 8 Specific embodiments thereof are shown.

[0038] See Figures 1 to 8As shown, the disassembly tool for an open impeller of a centrifugal pump includes: a chuck 1; a plurality of locking pins 2 distributed circumferentially along the chuck 1, each locking pin 2 being independently movable radially on the chuck 1, each locking pin 2 having a retaining section 23 for contacting the side of the blades of the open impeller, the retaining section 23 being provided with a non-metallic protective pad 5; a locking mechanism for independently locking each locking pin 2 at different radial positions on the chuck 1; and a handle 4 fixedly connected to the chuck 1.

[0039] When disassembling the open impeller 6 of the centrifugal pump, the operator first places the annular chuck 1 of the disassembly tool onto the pump body, ensuring its inner edge extends past the inducer 7. Since the inner diameter of the chuck 1 is larger than the outer diameter of the inducer 7, it fits smoothly without interfering with the inducer 7. Subsequently, the operator independently adjusts each of the circumferentially distributed locking pins 2 of the chuck 1, moving them radially until the locking section 23 of each pin 2 (i.e., the end with the non-metallic protective gasket 5) makes stable contact with the sides of different blades on the open impeller 6. By operating the locking mechanism, each adjusted pin 2 is independently locked in its current radial position, ensuring a tight, secure, and fixed multi-point locking connection between all pins 2 and the impeller 6 blades. Finally, the operator holds or applies a rotational torque opposite to the direction of the impeller 6's tightening by gripping or using a tool on the handle 4, which is fixedly connected to the chuck 1. This torque is transmitted synchronously and evenly to all locked pins 2 through the annular chuck 1, and the force is distributed to the sides of multiple blades by the clamping section 23, thereby jointly overcoming the huge binding force between the impeller 6 and the shaft and pump cover caused by the high-speed self-tightening effect, and realizing the smooth and controllable loosening and disassembly of the impeller 6.

[0040] Through the above technical solution, based on the multiple independently adjustable and lockable locking posts 2, the disassembly force point can be transformed from a single, inconveniently operated shaft groove point to multiple points distributed on the outer circumference of the impeller 6. This multi-point uniform force distribution method reduces the risk of tool slippage and sudden component failure due to localized stress concentration during operation, improves the safety of disassembly operations, and effectively avoids personnel injury. The design of the locking posts 2, which can move and lock independently along the radial direction, allows the tool to flexibly adapt to impellers 6 with different manufacturing tolerances or slight wear conditions, ensuring that each locking section 23 can effectively contact the blade side, enhancing the tool's versatility and reliability.

[0041] The uniform force distribution pattern formed by multiple locking pins 2 avoids impeller 6 deformation, hub cracking, or pump shaft damage caused by using tools such as pry bars at a single point of force. The non-metallic protective pad 5 on the clamping section 23 forms a soft contact interface between the locking pins 2 and the metal surface of the blades, effectively preventing scratches, indentations, or chipping on the blade surface during clamping and force application, protecting the aerodynamic profile and dynamic balance accuracy of the impeller 6, thus ensuring the reuse efficiency of the impeller 6 after disassembly. This tool mainly consists of an annular chuck 1, locking pins 2, a locking mechanism, and a handle 4. Its structure is simple and reliable, and its components are easy to manufacture, resulting in low cost, making it suitable for widespread use in industrial field maintenance environments.

[0042] It should be noted that directional terms such as "inner" and "outer" refer to "inner" and "outer" relative to the outline of the component. "Inner" refers to the direction towards the inside of the component, and "outer" refers to the direction away from it. Furthermore, terms such as "first" and "second" are used to distinguish one element from another and do not indicate sequence or importance. Moreover, in the following descriptions with accompanying drawings, the same reference numerals in different drawings represent the same element. The phrase "and / or" in the text refers to A and / or B, indicating that there are three possible scenarios: only A, only B, and both A and B. The phrase " / and" in the text refers to A and B, indicating that there are two possible scenarios: only A and both A and B.

[0043] In this disclosure, the inner diameter of the chuck 1 is larger than the outer diameter of the inducer 7 of the centrifugal pump to be disassembled, and its outer diameter is smaller than the outer diameter of the open impeller to be disassembled.

[0044] The operator sequentially passes each locking pin 2 through the corresponding oblong hole 31 on the chuck 1. Since the oblong hole 31 extends radially along the length of the chuck 1, it provides a defined and finite radial movement path for the locking pin 2. During tool installation, the operator can slide each locking pin 2 along this path, precisely moving its holding section 23 to contact the side of the corresponding blade of the open impeller 6. Once all locking pins 2 are in good contact with the blade, the operator tightens the corresponding locking element 32 (such as a screw) for each locking pin 2. The pressure generated by the locking element 32 firmly presses the locking pin 2 against the surface of the chuck 1, thus locking its current position and preventing radial or circumferential movement during subsequent disassembly. At this point, the locking pin 2, chuck 1, and locking element 32 form a rigid, integrated load-bearing structure.

[0045] Based on the structure of the waist-shaped hole 31, each locking post 2 is radially adjusted according to the actual blade distribution, ensuring that multiple locking sections 23 can tightly abut against the sides of each blade, thereby achieving a uniform distribution of disassembly force on the circumference of the impeller 6. The locking element 32 ensures that the locking post 2 will not loosen or retract when a huge disassembly torque is applied, ensuring the rigidity of the force transmission frame. Through uniform and stable multi-point locking, the disassembly force is distributed to multiple blades of the impeller 6, reducing local stress overload on the blades and thus preventing deformation, cracking, or chipping.

[0046] Specifically, the oblong hole is formed as a countersunk hole, which makes it easy to install screws, keeps the surface of the chuck smooth, and facilitates operation by the operator.

[0047] In one embodiment provided in this disclosure, the locking mechanism includes a plurality of strip-shaped holes 31 disposed on the chuck 1 and a plurality of locking members 32 corresponding to the holes 31 one by one. The length direction of each hole 31 extends radially along the chuck 1; the locking pin 2 passes through the corresponding hole 31 and is locked and fixed to the chuck 1 by the locking member 32.

[0048] Before disassembly, the operator inserts each locking pin 2 into the corresponding radial oblong hole 31 on the chuck 1. Since the oblong hole 31 provides a continuous adjustment stroke in the radial direction, the operator can independently slide each locking pin 2, causing its front locking section 23 (with protective gasket 5) to move radially inward until it is tightly fitted against the side of the corresponding blade on the open impeller 6 of the centrifugal pump. Once all locking pins 2 are adjusted to achieve optimal contact with the blades of the impeller 6, the operator tightens the corresponding locking element 32 (such as a screw) for each locking pin 2. The pressure generated by the locking element 32 firmly presses the locking pin 2 against the surface of the chuck 1, thus locking it in its current radial position, forming a rigid, multi-point synchronous force-applying frame with the chuck 1 as the carrier. Finally, by applying a rotational torque to the handle 4, this torque is evenly and synchronously transmitted to the impeller 6 blades through all the locked locking pins 2, thereby overcoming their self-tightening force and completing the disassembly.

[0049] By using multiple independently adjustable radial force points, the disassembly force is evenly distributed across the blades on the outer edge of the impeller 6, preventing impeller 6 deformation, cracking, or pump shaft damage caused by excessive local stress, thereby enhancing the tool's adaptability and operational controllability. The adjustment range provided by the oblong hole 31 allows the tool to be compatible with impellers 6 of different sizes or with slight manufacturing differences, ensuring that each clamping section 23 can reliably contact the blades, thus enabling the disassembly operation to be carried out safely and reliably.

[0050] Specifically, the locking element 32 is a screw, and the locking pin 2 has a threaded hole 20 that mates with the screw. By tightening the screw, the axial preload generated firmly presses the locking pin 2 against the surface of the chuck 1, forming a stable friction pair and preventing the locking pin 2 from radially shifting or circumferentially rotating when subjected to large disassembly torque. The operator can easily tighten or loosen the screw using only a conventional wrench, thereby locking or releasing the position of the locking pin 2.

[0051] In one embodiment, the locking post 2 includes an integrally formed insertion section 21, a pressing section 22 and a holding section 23. The insertion section 21 is used to be inserted into the waist-shaped hole 31 and connected to the locking member 32. The pressing section 22 is larger than the waist-shaped hole 31 so as to press against the chuck 1. The holding section 23 is provided with a protective pad 5.

[0052] During adjustment, the operator inserts the insertion section 21 of the locking pin 2 through the oblong hole 31 on the chuck 1 and makes the pressing section 22 fit against the surface of the chuck 1. Since the size of the pressing section 22 is larger than the oblong hole 31, it naturally forms an axial limit, preventing the locking pin 2 from passing through the hole. After the holding section 23 contacts the impeller 6 blades and is adjusted to the appropriate position, the locking member 32 (such as a screw) connected to the insertion section 21 is tightened. The locking force is transmitted through the insertion section 21, making the pressing section 22 adhere more tightly to the chuck 1, thereby firmly locking the locking pin 2 as a whole. The disassembly torque applied to the handle 4 is transmitted to the holding section 23 through the chuck 1, the pressing section 22 and the insertion section 21, and the protective pad 5 on it applies the force smoothly and evenly to the impeller 6 blades.

[0053] The one-piece molding structure helps ensure sufficient strength, making the tool more robust and durable. The large-area contact between the pressure section 22 and the chuck 1 provides stable pressure distribution and anti-overturning torque, preventing the chuck pins 2 from tilting or jamming under force, thereby ensuring the synchronicity and uniformity of the force applied by multiple chuck pins 2.

[0054] Furthermore, the insertion segment 21 is elongated, with its long side being larger than the diameter of the oblong hole 31 and its short side being smaller than the diameter of the oblong hole 31, so that the insertion segment 21 can only move along the length of the oblong hole 31 within the oblong hole 31.

[0055] During assembly, the operator must align the short side of the insertion section 21 with the oblong hole 31 before it can be passed through. Once passed through, because the long side is larger than the hole diameter, the insertion section 21 cannot rotate freely around its own axis inside the hole. Thereafter, the locking pin 2 can only slide along the length of the oblong hole 31, that is, the radial direction of the chuck 1, until its holding section 23 contacts the impeller 6 blades and is locked by the locking member 32.

[0056] This restricts the movement freedom of the locking pin 2 during adjustment, allowing it to move only along a preset radial path and preventing circumferential rotation or swaying. This ensures that the angle and orientation of the locking section 23 (and protective pad 5) at the front end of the locking pin 2 remain consistent and in contact with the blade side as it approaches and contacts the blade. When the operator pushes the locking pin 2 radially, they can feel a clear and smooth linear movement, making the synchronous or independent adjustment of multiple locking pins 2 more intuitive and effortless, thus improving operational controllability and efficiency.

[0057] In this disclosure, the material of the protective gasket 5 is polyvinylidene fluoride (PVDF) or nylon. Both PVDF and nylon are high-performance engineering plastics with a hardness much lower than that of the impeller 6 metal material, and possess excellent toughness, elasticity, and wear resistance. When the clamping section 23 contacts and presses against the side of the impeller 6 blades through this type of gasket, the gasket material can undergo micro-elastic deformation, thereby increasing the effective contact area and evenly distributing the contact pressure. This provides sufficient clamping force while avoiding the risk of direct scratches, indentations, or impacts to the precision blades by metal tools, ensuring that the aerodynamic profile and dynamic balance accuracy of the impeller 6 remain intact after disassembly.

[0058] In this disclosure, the protective gasket 5 is detachably mounted on the retaining section 23 of the retaining post 2. Thus, when the gasket wears to the point of affecting its protective performance, the operator can remove the protective gasket from the retaining post 2 and replace it with a new one. This ensures that the disassembly tool always provides reliable protection in optimal condition, avoiding the risk of indirect damage to the impeller 6 caused by the gasket thinning, cracking, or surface hardening due to long-term wear. Simultaneously, since there is no need to replace or repair the entire retaining post 2, the tool's maintenance costs are reduced.

[0059] In one embodiment, there are at least three locking pins 2, evenly distributed around the circumference of the chuck 1. During operation, after adjustment and locking, the locking sections 23 of the at least three evenly distributed locking pins 2 can simultaneously and at equal angular intervals form tight contact with the corresponding sides of multiple blades on the open impeller 6. When a disassembly torque is applied through the handle 4, the torque is synchronously and proportionally transmitted to each locking pin 2 through the chuck 1. Because the locking pins 2 are evenly distributed, the force shared by each locking pin 2 and acting on the blade is similar in magnitude and coordinated in direction, thus forming a balanced and stable rotational couple on the outer circumference of the impeller 6 to overcome its self-tightening force.

[0060] The evenly distributed multi-point support effectively disperses the disassembly force, ensuring uniform stress distribution on the impeller 6 and pump bearings. This prevents impeller 6 deformation, hub cracking, or pump shaft damage caused by localized overload. Simultaneously, it effectively prevents impeller 6 from tilting, jamming, or suddenly loosening during the disassembly process, making the entire disassembly operation smooth and controllable.

[0061] Specifically, see the appendix. Figure 4 and Figure 5 As shown, the chuck has eight oblong holes, and correspondingly, eight locking pins are also provided, which helps to distribute the force evenly. In this case, the operator can selectively insert the locking pins according to actual needs, thus facilitating the operation.

[0062] In one embodiment, the handle 4 is welded to the chuck 1, making the handle 4 and the chuck 1 a robust whole. When disassembling the self-tightening impeller 6 due to high speed, the operator often needs to apply torque, sometimes even requiring the use of an extension rod. The welded structure ensures that this huge torque is transmitted from the handle 4 to the chuck 1 without loss and stably, avoiding the risks of loosening, deformation, or shear failure that may occur with detachable connections such as bolts or pins, thus directly ensuring the effectiveness of the disassembly operation.

[0063] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0064] Finally, it should be noted that this invention is not limited to the optional embodiments described above, and various other forms of products can be derived under the guidance of this invention. The specific embodiments described above should not be construed as limiting the scope of protection of this invention, which should be determined by the claims, and the specification can interpret the claims.

Claims

1. A disassembly tool for an open impeller of a centrifugal pump, characterized in that, include: Chuck; Multiple locking pins are distributed circumferentially along the chuck, and each locking pin is independently movable on the chuck along the radial direction of the chuck. Each locking pin has a locking section for contacting the side of the blade of the open impeller, and the locking section is provided with a non-metallic protective gasket. A locking mechanism for independently locking each of the said locking pins at different radial positions on the chuck; and, The handle is fixedly connected to the chuck.

2. The disassembly tool for an open impeller of a centrifugal pump according to claim 1, characterized in that, The inner diameter of the chuck is larger than the outer diameter of the inducer of the centrifugal pump to be disassembled, while its outer diameter is smaller than the outer diameter of the open impeller to be disassembled.

3. The disassembly tool for an open impeller of a centrifugal pump according to claim 1, characterized in that, The locking mechanism includes a plurality of strip-shaped oblong holes provided on the chuck and a plurality of locking members corresponding to the oblong holes one by one, wherein the length direction of each oblong hole extends radially along the chuck. The locking pin passes through the corresponding waist-shaped hole and is locked and fixed to the chuck by a locking member.

4. The disassembly tool for an open impeller of a centrifugal pump according to claim 3, characterized in that, The locking element is a screw, and the locking pin has a threaded hole that mates with the screw.

5. The disassembly tool for an open impeller of a centrifugal pump according to claim 3, characterized in that, The locking post includes an integrally formed insertion section, a pressing section, and a retaining section. The insertion section is used to insert into the waist-shaped hole and connect to the locking member. The pressing section is larger than the waist-shaped hole to press against the chuck. The retaining section is provided with the protective pad.

6. The disassembly tool for an open impeller of a centrifugal pump according to claim 5, characterized in that, The plug segment is elongated, with its long side being larger than the diameter of the oblong hole and its short side being smaller than the diameter of the oblong hole, so that the plug segment can only move along the length of the oblong hole within the oblong hole.

7. The disassembly tool for an open impeller of a centrifugal pump according to claim 1, characterized in that, The protective liner is made of polyvinylidene fluoride or nylon.

8. The disassembly tool for an open impeller of a centrifugal pump according to claim 1, characterized in that, The protective liner is detachably installed on the retaining section of the retaining post.

9. The disassembly tool for an open impeller of a centrifugal pump according to claim 1, characterized in that, The number of the chucks is at least three, and they are evenly distributed along the circumference of the chuck.

10. The disassembly tool for an open impeller of a centrifugal pump according to any one of claims 1-9, characterized in that, The handle is welded to the chuck.

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