Blade-adjustable submersible mixed-flow pump rotor structure

Abstract

This invention discloses a submersible axial-flow pump rotor structure with adjustable blades, belonging to the field of axial-flow pump rotors. The rotor structure includes two rotor pressure rings, with a ring body at one end of the two pressure rings approaching each other. Multiple U-shaped grooves are symmetrically formed at the other end of the two ring bodies. Rotor laminations are mounted on the outer sides of the two ring bodies. The two rotor pressure rings and rotor laminations are connected by detachable fasteners. The impeller assembly includes an impeller body and multiple blade assemblies circumferentially distributed on the impeller body. Addressing the technical deficiency of existing submersible axial-flow pumps where the impeller outer edge is directly welded to the motor rotor, resulting in an inability to adjust the blade installation angle, this invention provides a special mechanically assembled rotor structure. This structure adjusts the impeller assembly from a welded fixed type to a semi-adjustable type, thereby achieving adjustable blade installation angles.

Description

Technical Field

[0001] This invention relates to the field of full-flow pump rotors, and more specifically, to a submersible full-flow pump rotor structure with adjustable blades. Background Technology

[0002] Submersible electric pumps, especially submersible axial flow pumps, are core equipment in large-scale water conservancy projects, urban flood control and drainage, agricultural irrigation and water transfer projects. Their operational stability and hydraulic efficiency are of paramount importance. Axial flow pumps typically integrate the motor and the pump into one unit, with the motor rotor directly enveloping the pump impeller and driving its rotation. In this extremely compact structure, the design of the rotor components, especially the connection and transmission parts between the impeller and the motor rotor, directly affects the reliability and service life of the entire machine. In the current technological landscape, most mainstream submersible axial flow pumps on the market adopt a fixed impeller structure. The specific manufacturing and assembly process involves directly welding the outer edge of the impeller to the inside of the motor rotor, making the impeller and the motor rotor rigidly connected and forming an inseparable whole. Although this design improves the overall structural strength and rigidity of the rotor components to a certain extent, it has exposed many serious process defects in actual production, manufacturing, application and maintenance. First, there is the unavoidable problem of welding deformation. Pump blades typically have three-dimensional twisted spatial surfaces calculated with precise fluid dynamics to meet specific hydraulic dynamic requirements. However, due to the high-strength welding required between the blades and the impeller body and rotor, huge local high temperatures are generated during the welding process. During the subsequent cooling process, the residual thermal stress generated by the welding will inevitably be released, which can easily cause severe twisting and deformation of the blade profile. This stress deformation will cause the geometry of the formed blade to deviate significantly from the original design parameters, which not only disrupts the flow pattern inside the pump and leads to a decrease in hydraulic efficiency, but may also cause cavitation and abnormal vibration during operation. Secondly, there is the fatal weakness of the blade installation angle being unadjustable. For a full-flow pump, the blade installation angle directly determines the pump's core performance indicators such as flow rate and head. In actual production, if the overall performance is found to be below design standards during the initial assembly test before leaving the factory, it is often necessary to fine-tune the blade angle. However, with traditional welded fixed impellers, the blade installation angle is permanently locked after welding, completely losing the room for adjustment. Once assembly and testing fail, the only remedial measure for the manufacturer is to use destructive methods, such as cutting off the already welded blades with equipment, re-grinding and adjusting the angle, and then re-welding them. This repeated cutting and high-temperature welding greatly increases the probability of the blades and the rotor as a whole being scrapped. The high material consumption and cumbersome rework process inevitably lead to increased production costs and serious delays in the production cycle. In summary, how to break through the technical constraints of traditional welded fixed impellers and design a fully axial flow pump rotor structure that can ensure structural strength, avoid thermal stress deformation, and achieve convenient blade angle adjustment has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention aims to provide a submersible axial-flow pump rotor structure with adjustable blades. This structure addresses the shortcomings of existing submersible axial-flow pumps where the impeller outer edge is directly welded to the motor rotor, leading to welding stress release causing blade deformation and deviation from design parameters, and the inability to adjust the blade installation angle after welding. The present invention provides a special mechanically assembled rotor structure that adjusts the impeller component from a welded fixed type to a semi-adjustable type, thereby achieving adjustable blade installation angle. This completely eliminates the cumbersome cutting and re-welding process, avoids blade scrapping due to initial assembly test failure, shortens the production cycle, and enables direct transmission of motor torque, eliminating the need for the pump shaft to bear torque.

[0004] To solve the above problems, the present invention adopts the following technical solution.

[0005] A submersible full-flow pump rotor structure with adjustable blades includes two rotor pressure rings. A ring body is provided at one end of the two rotor pressure rings, and multiple U-shaped grooves are symmetrically formed at the end of the two ring bodies. Rotor laminations are mounted on the outer sides of the two ring bodies. The two rotor pressure rings and rotor laminations are connected by detachable fasteners. An impeller assembly is provided inside the two rotor pressure rings. The impeller assembly includes an impeller body and multiple blade assemblies circumferentially distributed on the impeller body. Each blade assembly includes fan blades, and a first blade shank is provided at the end of each fan blade near the impeller body. The fan blade has a second blade holder at the end furthest from the impeller body. The first blade holder is adjustablely connected to the impeller body to change the installation angle of the fan blade. The two rings, U-shaped groove, and rotor laminations can press and fix the second blade holder. When the full-flow pump is running, the motor torque is directly transmitted to the blade assembly through the rotor pressure ring and rotor laminations to drive the impeller assembly to rotate. Through the double fixation of the first and second blade holders, the torque is directly transmitted to the fan blade. The adjustable connection enables angle adjustment, completely avoiding overall scrap due to substandard testing and significantly reducing production costs.

[0006] Furthermore, the impeller body includes a tube body, on the outer wall of which a blind hole for mounting the first blade shank is machined, and a mounting hole is provided at the bottom of the blind hole; the outer side of the first blade shank has an oblong hole corresponding to the mounting hole; the detachable fastener passes through the oblong hole and screws into the mounting hole to fasten the blade assembly to the impeller body; the oblong hole allows the fan blade mounting angle to be adjusted within a certain range, and the blind hole, oblong hole, and detachable fastener work together to ensure the connection strength of the first blade shank and to achieve flexible fine-tuning of the fan blade mounting angle, thereby improving assembly and debugging efficiency.

[0007] Furthermore, after the blade assembly is adjusted to a predetermined angle, the first blade shank is fixed in the mounting hole of the detachable fastener to prevent the blade assembly from changing angle during the operation of the water pump. The detachable fastener is screwed into the mounting hole and fixed in the first blade shank to form an effective locking mechanism to resist water flow impact and vibration, prevent blade angle deviation, and ensure long-term stable operation of the water pump.

[0008] Furthermore, the second blade holder is housed within the U-shaped groove; after removing the rotor pressure ring, the impeller assembly can be removed as a whole along the opening direction of the U-shaped groove, and the U-shaped groove on the rotor pressure ring provides a limit for the second blade holder; removing the rotor pressure ring allows the impeller assembly to be removed as a whole along the U-shaped groove, eliminating tedious disassembly steps and significantly improving maintenance convenience.

[0009] Furthermore, rotor washers are detachably connected to both ends of the rotor lamination, and the rotor washers are installed between the rotor pressure ring and the rotor lamination by detachable fasteners. The rotor washers effectively buffer the contact stress between the rotor pressure ring and the rotor lamination, making the force more uniform, enhancing the assembly tightness of each component, and further improving the overall structural rigidity and mechanical strength of the rotor.

[0010] Compared with the prior art, the advantages of this invention are: The semi-adjustable structure of this invention replaces the traditional integral high-temperature welding and fixing process, preventing the technical defects of blade profile distortion caused by the release of residual welding heat stress. This ensures that the physical geometry of the blades conforms to the initial hydraulic design parameters, maintaining the flow pattern and hydraulic efficiency of the pump. Furthermore, through the adjustable connection between the first blade shank and the impeller body, when the performance of the initial assembly test does not meet the standard, the operator does not need to perform destructive re-welding processes such as cutting and grinding the blades; the parameter correction can be completed simply by adjusting the installation angle. This structural design avoids the scrapping of blades and rotor components due to assembly errors, controls material loss, and shortens the equipment manufacturing cycle. This invention changes the transmission force path of the full-flow pump; when the pump is running, the motor torque is directly transmitted to the blade assembly containing the fan blades through two rotor pressure rings and rotor laminations, thereby driving the impeller assembly to rotate as a whole; this torque transmission path eliminates the need for the internal pump shaft to bear the driving torque, reducing the design and operating load of the pump shaft; at the same time, the fan blades are coaxially distributed and fixed at both ends through the inner first blade holder and the outer second blade holder; the outer second blade holder is clamped by the rotor pressure ring, U-shaped groove and rotor laminations, providing a stable axial fixing force and enhancing the overall structural rigidity of the rotor components in operation; This invention optimizes the fine-tuning, fastening, disassembly, and maintenance mechanism between components. The outer wall of the impeller body's tube has blind holes and mounting holes. Combined with the waist-shaped hole on the outer side of the first blade handle, the relative position of the detachable fasteners within the holes allows for adjustment of the fan blade installation angle within a certain range. After adjustment, the detachable fasteners are screwed in and tightened against the first blade handle, forming an anti-loosening structure to prevent angular displacement of the equipment under water flow impact. During equipment disassembly and maintenance, the U-shaped groove on the rotor pressure ring provides a space for the second blade handle. After removing the rotor pressure ring, the impeller assembly can be pulled out as a whole along the opening direction of the U-shaped groove, simplifying the operation. Furthermore, the rotor washers detachably connected at both ends of the component reduce contact stress concentration during assembly, ensuring overall component stress balance and torsional stiffness. Attached Figure Description

[0011] Figure 1 This is an overall perspective view of the present invention; Figure 2 This is an overall exploded view of the present invention; Figure 3 This is a perspective view of the impeller assembly of the present invention; Figure 4 This is a split perspective view of the impeller assembly of the present invention; Figure 5 This is a perspective view of the impeller body of the present invention; Figure 6 This is a top view of the blade assembly of the present invention; Figure 7 This is a partial top view of the blade assembly of the present invention; Figure 8 This is a partial half-section perspective view of the present invention; Figure 9 for Figure 8 A magnified view of part A.

[0012] Explanation of the labels in the diagram: 1. Rotor pressure ring; 2. U-shaped groove; 3. Rotor lamination; 4. Rotor washer; 5. Impeller body; 6. Fan blade; 7. First blade holder; 8. Waist-shaped hole; 9. Second blade holder. Detailed Implementation

[0013] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0014] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0015] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within a compatible component. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0016] Example 1 This embodiment illustrates the structure of the device and its beneficial effects: Please see Figures 1-9A submersible full-flow pump rotor structure with adjustable blades includes two rotor pressure rings 1. A ring body is provided at one end of the two rotor pressure rings 1, and multiple U-shaped grooves 2 are symmetrically formed at the end of the two ring bodies. Rotor laminations 3 are mounted on the outer sides of the two ring bodies. The two rotor pressure rings 1 and the rotor laminations 3 are connected by detachable fasteners. An impeller assembly is provided inside the two rotor pressure rings 1. The impeller assembly includes an impeller body 5 and multiple blade assemblies circumferentially distributed on the impeller body 5. The blade assembly includes fan blades 6, and a first blade shank 7 is provided at the end of the fan blade 6 near the impeller body 5. The end of blade 6 furthest from impeller body 5 is provided with a second blade shank 9. The first blade shank 7 is adjustablely connected to impeller body 5 to change the installation angle of blade 6. The two rings, U-shaped groove 2 and rotor lamination 3 can press and fix the second blade shank 9. When the full-flow pump is running, the motor torque is directly transmitted to the blade assembly through rotor pressure ring 1 and rotor lamination 3 to drive the impeller assembly to rotate. Through the double fixation of the first blade shank 7 and the second blade shank 9, the torque is directly transmitted to blade 6. The adjustable connection realizes the angle adjustment, completely avoids the overall scrap due to failure to meet the test standards, and significantly reduces production costs. The impeller body 5 includes a tube body 501. A blind hole 502 for installing the first blade stalk 7 is machined on the outer wall of the tube body 501. An installation hole 503 is provided at the bottom of the blind hole 502. The outer side of the first blade stalk 7 has an oblong hole 8 corresponding to the installation hole 503. A detachable fastener passes through the oblong hole 8 and is screwed into the installation hole 503 to fasten the blade assembly to the impeller body 5. The oblong hole 8 allows the installation angle of the fan blade 6 to be adjusted within a certain range. The blind hole 502, the oblong hole 8 and the detachable fastener work together to ensure the connection strength of the first blade stalk 7 and to achieve flexible fine adjustment of the installation angle of the fan blade 6, thereby improving the assembly and debugging efficiency. After the blade assembly is adjusted to the predetermined angle, the first blade holder 7 is fixed in the mounting hole 503 of the detachable fastener to prevent the blade assembly from changing angle during the operation of the water pump. The detachable fastener is screwed into the mounting hole 503 and the first blade holder 7 is fixed to form an effective locking mechanism to resist water flow impact and vibration, prevent the fan blade 6 from shifting angle, and ensure the long-term stable operation of the water pump. The second blade holder 9 is housed in the U-shaped groove 2; after the rotor pressure ring 1 is removed, the impeller assembly can be taken out as a whole along the opening direction of the U-shaped groove 2. The U-shaped groove 2 on the rotor pressure ring 1 provides a limit for the second blade holder 9; the impeller assembly can be taken out as a whole along the U-shaped groove 2 by removing the rotor pressure ring 1, eliminating tedious disassembly steps and significantly improving maintenance convenience. Rotor washers 4 are detachably connected to both ends of the rotor lamination 3. The rotor washers 4 are installed between the rotor pressure ring 1 and the rotor lamination 3 by detachable fasteners. The rotor washers 4 effectively buffer the contact stress between the rotor pressure ring 1 and the rotor lamination 3, making the force more uniform, enhancing the assembly tightness of each component, and further improving the overall structural rigidity and mechanical strength of the rotor. Example 2

[0017] This embodiment illustrates the working principle of the device: Phase 1: Preliminary installation and angle adjustment of the blade assembly; When assembling the pump impeller components, first install the blade assembly onto the impeller body 5; the operator inserts the first blade shank 7 on the inner side of the blade 6 into the blind hole machined on the outer wall of the impeller body 5; at this time, the oblong hole 8 on the outer side of the first blade shank 7 is aligned with the mounting hole at the bottom of the blind hole; the operator passes the detachable fastener through the oblong hole 8 and initially screws it into the mounting hole, keeping it slightly loose; in this state, the operator can rotate the blade 6, causing the first blade shank 7 to rotate along the central axis within the blind hole; during the rotation, the rod of the detachable fastener slides relative to the blade within the arc-shaped limit range of the oblong hole 8, thereby achieving stepless adjustment of the installation angle of the blade 6 within a certain range to meet different hydraulic design parameters or correct deviations in the initial test; Second stage: Tightening and locking of the inner structure; After the fan blade 6 is adjusted to the predetermined standard angle, the operator uses tools to fully tighten the detachable fasteners, screwing them deeply into the mounting holes to fix the first blade holder 7; This mechanical action firmly fastens the blade assembly to the impeller body 5, forming a reliable anti-loosening locking mechanism, effectively preventing the blade assembly from undergoing unexpected angle changes due to water flow impact or equipment vibration during subsequent high-load operation of the water pump; The third stage: the closure and axial fixation of the outer rotor components; after the internal impeller is assembled, the outer rotor components are closed and assembled; the two rotor pressure rings 1 are aligned with the two ends of the rotor laminations 3 respectively, and rotor washers 4 are added between the rotor pressure rings 1 and the rotor laminations 3 to buffer contact stress; during the closure process, the second blade shank 9 on the outer side of the fan blade 6 is accurately placed into the U-shaped groove 2 opened on the rotor pressure ring 1; then, multiple detachable fasteners are used to fasten the rotor pressure ring 1, rotor washers 4 and rotor laminations 3 into a whole; at this time, the rotor pressure ring 1, U-shaped groove 2 and rotor laminations 3 cooperate with each other to firmly clamp the second blade shank 9 from the outside, realizing the high-strength axial fixation of the entire impeller assembly; Fourth stage: Power-on operation and torque transmission of the full-flow pump; When the submersible full-flow pump is powered on and put into operation, the electromagnetic force generated by the motor stator drives the external rotor components to rotate; In this structure, the motor torque does not need to pass through the central main shaft of the pump, but acts directly on the rotor lamination 3 and rotor pressure ring 1; The rotating rotor pressure ring 1 and rotor lamination 3 transmit the huge motor torque directly to the clamped second blade 9 through the U-shaped groove 2, thereby driving the fan blade 6 and the internal impeller body 5 to rotate synchronously as a whole, completing the pressurized pumping of water; Phase 5: Equipment inspection and convenient disassembly; When the equipment needs internal inspection or blade assembly replacement after long-term operation, maintenance personnel do not need to disassemble the main shaft and internal fasteners in a complicated manner; they only need to remove the rotor pressure rings 1 and rotor washers 4 on both sides; Since the second blade shank 9 loses the external clamping force of the rotor pressure rings 1 and the end of the U-shaped groove 2 is open, the internal impeller assembly can be easily removed from the inner cavity of the rotor lamination 3 as a whole along the opening direction of the U-shaped groove 2, which greatly improves the efficiency of inspection and maintenance; In summary, the semi-adjustable structure of this invention replaces the traditional integral high-temperature welding and fixing process, preventing the technical defects of blade profile distortion caused by the release of residual welding heat stress. This ensures that the physical geometry of the blades conforms to the initial hydraulic design parameters, maintaining the flow pattern and hydraulic efficiency of the pump. Furthermore, through the adjustable connection between the first blade shank and the impeller body, when the performance of the initial assembly test does not meet the standard, operators do not need to perform destructive re-welding processes such as cutting and grinding the blades; they can simply adjust the installation angle to correct the parameters. This structural design avoids the scrapping of blades and rotor components due to assembly errors, controls material loss, and shortens the equipment manufacturing cycle. This invention changes the transmission force path of the full-flow pump; when the pump is running, the motor torque is directly transmitted to the blade assembly containing the fan blades through two rotor pressure rings and rotor laminations, thereby driving the impeller assembly to rotate as a whole; this torque transmission path eliminates the need for the internal pump shaft to bear the driving torque, reducing the design and operating load of the pump shaft; at the same time, the fan blades are coaxially distributed and fixed at both ends through the inner first blade holder and the outer second blade holder; the outer second blade holder is clamped by the rotor pressure ring, U-shaped groove and rotor laminations, providing a stable axial fixing force and enhancing the overall structural rigidity of the rotor components in operation; This invention optimizes the fine-tuning, fastening, disassembly, and maintenance mechanism between components. The outer wall of the impeller body's tube has blind holes and mounting holes. Combined with the waist-shaped hole on the outer side of the first blade handle, the relative position of the detachable fasteners within the holes allows for adjustment of the fan blade installation angle within a certain range. After adjustment, the detachable fasteners are screwed in and tightened against the first blade handle, forming an anti-loosening structure to prevent angular displacement of the equipment under water flow impact. During equipment disassembly and maintenance, the U-shaped groove on the rotor pressure ring provides a space for the second blade handle. After removing the rotor pressure ring, the impeller assembly can be pulled out as a whole along the opening direction of the U-shaped groove, simplifying the operation. Furthermore, the rotor washers detachably connected at both ends of the component reduce contact stress concentration during assembly, ensuring overall component stress balance and torsional stiffness.

[0018] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A submersible full-flow pump rotor structure with adjustable blades, characterized in that: The device includes two rotor pressure rings (1), with a ring body at one end of each ring approaching each other. Multiple U-shaped grooves (2) are symmetrically formed at the other end of each ring body. Rotor laminations (3) are mounted on the outer sides of the two ring bodies. The two rotor pressure rings (1) and the rotor laminations (3) are connected by detachable fasteners. An impeller assembly is provided inside each rotor pressure ring (1). The impeller assembly includes an impeller body (5) and multiple blade assemblies circumferentially distributed on the impeller body (5). Each blade assembly includes fan blades (6). The fan blade (6) is provided with a first blade shank (7) at one end near the impeller body (5), and a second blade shank (9) is provided at the other end of the fan blade (6) away from the impeller body (5). The first blade shank (7) is adjustablely connected to the impeller body (5) to change the installation angle of the fan blade (6). The two rings, the U-shaped groove (2) and the rotor lamination (3) can press and fix the second blade shank (9). When the full-flow pump is running, the motor torque is directly transmitted to the blade assembly through the rotor pressure ring (1) and the rotor lamination (3) to drive the impeller assembly to rotate.

2. The submersible full-flow pump rotor structure with adjustable blades according to claim 1, characterized in that: The impeller body (5) includes a tube body (501), and a blind hole (502) for installing the first blade stalk (7) is machined on the outer wall of the tube body (501). The bottom of the blind hole (502) is provided with a mounting hole (503). The outer side of the first blade stalk (7) has a waist-shaped hole (8) corresponding to the mounting hole (503). The detachable fastener passes through the waist-shaped hole (8) and is screwed into the mounting hole (503) to fasten the blade assembly to the impeller body (5). The blade (6) can be adjusted within a certain range through the waist-shaped hole (9).

3. The submersible full-flow pump rotor structure with adjustable blades according to claim 1, characterized in that: After the blade assembly is adjusted to a predetermined angle, the first blade shank (7) is fixed in the detachable fastener mounting hole (503) to prevent the blade assembly from changing angle during pump operation.

4. The submersible full-flow pump rotor structure with adjustable blades according to claim 1, characterized in that: The second petiole (9) is housed within the U-shaped groove (2); After the rotor pressure ring (1) is removed, the impeller assembly can be taken out as a whole along the opening direction of the U-shaped groove (2).

5. The submersible full-flow pump rotor structure with adjustable blades according to claim 1, characterized in that: Both ends of the rotor lamination (3) are detachably connected to rotor washers (4), and the rotor washers (4) are installed between the rotor pressure ring (1) and the rotor lamination (3) by detachable fasteners.

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