Energy-saving multistage pump

Abstract

The application relates to the technical field of multi-stage pumps, in particular to an energy-saving multi-stage pump which comprises a bottom shell, a top shell, a motor and a main shaft, a movable impeller is movably arranged on the outer side of the main shaft, a connecting impeller is arranged on the outer side of the main shaft, a fixed impeller is arranged between the movable impeller and the connecting impeller, the fixed impeller is arranged on the outer side of the main shaft, a plurality of rotating rods which respectively penetrate through the movable impeller, the fixed impeller and the connecting impeller are arranged on the inner sides of the bottom shell and the top shell, and the plurality of rotating rods are movably arranged on the inner side of the movable impeller. The energy-saving multi-stage pump directly controls the core parameters of the flow channel in the pump by adjusting the distance between the movable impeller and the fixed impeller through a main control mechanism and adjusting the groove depth of the fixed impeller and the connecting impeller through a linkage groove adjusting mechanism. The direct control of the core parameters of the flow channel in the pump greatly reduces the deviation between the output parameters and the actual demand, improves the conveying efficiency, reduces the energy loss, and is suitable for high-precision production scenes.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of multi-stage pumps, in particular to an energy-saving multi-stage pump. BACKGROUND

[0002] A multi-stage pump is a fluid conveying device for realizing high-pressure output by connecting multiple impellers in series, and its development is closely related to the demand of industrial production for high-pressure fluid conveying, including a multi-stage centrifugal pump. The multi-stage centrifugal pump is connected with multiple impellers in series on the same pump shaft, and realizes the superposition of lift by using the principle of "impeller step-by-step pressure increase". The development of the multi-stage centrifugal pump is always closely related to the demand of industrial production for "high lift, stable conveying and adaptation to complex working conditions", and the multi-stage centrifugal pump has become an indispensable fluid conveying device in the fields of energy, water conservancy and industrial manufacturing.

[0003] The existing multi-stage centrifugal pump has significant limitations in operation adjustment mode. The control means is mostly concentrated on the driving motor, and only the motor speed can be adjusted to indirectly change the pump output. The adjustment dimension is single and lacks pertinence. The output parameters often deviate from the actual demand, which affects the conveying efficiency and cannot meet the adaptation requirements of high-precision production scenes.

[0004] When the operating load exceeds the rated bearing range of the device, the existing multi-stage centrifugal pump is prone to cause obvious noise and vibration problems. The root cause of such abnormal phenomena is that the load overload leads to imbalance of the action of the impeller and the fluid and uneven stress between components. Not only will it produce excessive noise to pollute the working environment, but also may cause component failure, shorten the service life of the device, increase the maintenance cost and downtime risk. Therefore, an energy-saving multi-stage pump is proposed. SUMMARY

[0005] One of the technical problems to be solved by the present application is how to design an energy-saving multi-stage pump with precise flow regulation and noise reduction.

[0006] To solve the above technical problems, the energy-saving multi-stage pump provided by the embodiments of the present application comprises a bottom shell, a top shell, a motor and a main shaft. A movable impeller is movably arranged on the outer side of the main shaft. A connecting impeller is arranged on the outer side of the main shaft. A fixed impeller is arranged between the movable impeller and the connecting impeller. The fixed impeller is arranged on the outer side of the main shaft. A plurality of rotating rods are arranged in the bottom shell and the top shell and penetrate the movable impeller, the fixed impeller and the connecting impeller respectively. The rotating rods are movably arranged in the inner side of the movable impeller. An extension deformation mechanism is arranged between the movable impeller and the fixed impeller, and is used for adjusting the distance between the fixed impeller and the movable impeller. A groove adjusting mechanism is arranged between the fixed impeller and the connecting impeller, and is used for adjusting the groove depth between the fixed impeller and the connecting impeller. A main control mechanism is arranged at the end of the bottom shell and is connected with the rotating rods, and is used for driving the extension deformation mechanism and the groove adjusting mechanism to work.

[0007] In some embodiments, the telescopic deformation mechanism comprises a plurality of connecting shells arranged at the end of the mobile impeller, the fixed impeller is arranged with a plurality of fixed plates near the end of the mobile impeller, the side edges of the plurality of fixed plates are arranged with sliding plates, the plurality of sliding plates are respectively movably arranged inside the corresponding connecting shells, the end of the mobile impeller is arranged with a sleeve ring connected with the plurality of connecting shells, and the sleeve ring is movably arranged outside the main shaft.

[0008] In some embodiments, the outer side of the sliding plate is arranged with a plurality of sliding grooves, the inner side of the connecting shell is arranged with a reinforcing rib movably connected with the plurality of sliding grooves, the end of the fixed impeller is arranged with a connecting ring connected with the fixed plate, and the connecting ring is arranged outside the main shaft.

[0009] In some embodiments, the recess adjusting mechanism comprises a plurality of rotating plates arranged at the end of the fixed impeller and connected with the connecting impeller, an arc-shaped groove plate is movably arranged between the plurality of rotating plates, the end of the fixed impeller is arranged with a mounting cylinder connected with the plurality of rotating plates, and the mounting cylinder is arranged outside the main shaft.

[0010] In some embodiments, the inner side of the arc-shaped groove plate is arranged with a baffle, the inner side of the arc-shaped groove plate is movably arranged with an arc-shaped plate, the side surface of the baffle and the arc-shaped plate are arranged with springs, the side edge of the rotating plate is arranged with a T-shaped plate, and the inside of the arc-shaped plate is movably arranged outside the T-shaped plate.

[0011] In some embodiments, the outer side of the mounting cylinder is arranged with a connecting clamp, the inner side of the connecting clamp is rotatably arranged with a rotating rod, the outer surface of the rotating rod inside the inner side of the connecting clamp is arranged with a gear, the end of the rotating rod is arranged with a limiting disc penetrating through the inner side of the connecting clamp, the outer side of the connecting clamp is arranged with a steel rope, and the end of the steel rope is arranged with a fixed column connected with the inner side of the arc-shaped groove plate.

[0012] In some embodiments, the two sides of the connecting clamp are arranged with special-shaped plates, the side surfaces of the two special-shaped plates are arranged with fixed clamps, the inner sides of the two fixed clamps are movably arranged with guide blocks, a rack engaged with the gear is arranged between the two guide blocks, the top of the rack is arranged with a straight plate, and the outer side of the straight plate is arranged with a mounting clamp connected with the outer side of the rotating rod.

[0013] In some embodiments, the main control mechanism comprises a sealing disc arranged at the end of the main shaft and the inner side of the rotating rod, the end of the rotating rod is arranged with a rotating disc, the end of the rotating disc is arranged with an annular groove, and the end of the rotating disc and the inner side of the annular groove are arranged with a moving clamp.

[0014] In some embodiments, the side of the moving clamp is provided with an L-shaped rod, the bottom end of the L-shaped rod is provided with a fixed block, the inside of the fixed block is threadedly provided with a screw rod movably connected with the bottom shell, and the end of the screw rod is provided with a knob.

[0015] The present application has at least the following advantages:

[0016] 1. The distance between the moving impeller and the fixed impeller is adjusted by the main control mechanism driving the telescopic deformation mechanism, and the groove depth of the fixed impeller and the connecting impeller is changed by the linkage groove adjusting mechanism. This direct regulation of the core parameters of the pump flow channel greatly reduces the deviation of the output parameters from the actual demand, improves the conveying efficiency while reducing energy loss, and adapts to high-precision production scenes.

[0017] 2. The cooperation of the arc-shaped plate and the spring in the groove adjusting mechanism can flexibly buffer the fluid impact, and the telescopic deformation mechanism adjusts the force change between the impellers through the sliding of the sliding plate and the connecting shell. The two cooperate to balance the action relationship between the impeller and the fluid, avoid uneven stress between components, and effectively suppress noise generation and vibration conduction.

[0018] 3. The reinforcing ribs of the telescopic deformation mechanism cooperate with the sliding groove to strengthen the structure support, the T-shaped plate of the groove adjusting mechanism cooperates with the arc-shaped plate to guide and ensure accurate adjustment, and the main control mechanism realizes stable driving through the screw rod and the moving clamp. The linkage between the mechanisms through rotating rods, racks and other components not only ensures smooth and accurate adjustment, but also improves the running stability of the equipment under complex working conditions, and adapts to high-pressure conveying requirements. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the whole application;

[0020] Figure 2 It is a structural schematic diagram of the main shaft, moving impeller, fixed impeller and connecting impeller of the application;

[0021] Figure 3 It is a structural schematic diagram of the moving impeller, main shaft, connecting shell and fixed plate of the application;

[0022] Figure 4 It is an exploded structural schematic diagram of the fixed impeller, moving impeller, connecting shell and fixed plate of the application;

[0023] Figure 5 It is a structural schematic diagram of the fixed impeller and the groove adjusting mechanism of the application;

[0024] Figure 6 It is a cross-sectional structural schematic diagram of the mounting cylinder of the application;

[0025] Figure 7 It is a structural schematic diagram of the connecting clamp, special-shaped plate, guide block and rack of the application;

[0026] Figure 8 Structure diagram of the steel rope, the limiting disc and the gear of the application;

[0027] Figure 9 Structure diagram of the rotating rod and the main control mechanism of the application.

[0028] In the figure: 1, bottom shell; 2, top shell; 3, motor; 4, main shaft; 5, moving impeller; 6, fixed impeller; 7, connecting impeller; 8, telescopic deformation mechanism; 81, connecting shell; 82, fixed plate; 83, sliding plate; 84, sliding groove; 85, reinforcing rib; 86, collar; 87, connecting ring; 9, groove adjusting mechanism; 91, rotating plate; 92, T-shaped plate; 93, arc-shaped groove plate; 94, arc-shaped plate; 95, mounting cylinder; 96, baffle; 97, spring; 98, mounting clamp; 99, straight plate; 910, rack; 911, guide block; 912, fixed clamp; 913, special-shaped plate; 914, connecting clamp; 915, fixed column; 916, steel rope; 917, limiting disc; 918, gear; 919, rotating rod; 10, main control mechanism; 101, sealing disc; 102, rotating disc; 103, ring groove; 104, moving clamp; 105, L-shaped rod; 106, fixed block; 107, screw rod; 108, knob; 11, rotating rod. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0030] Embodiment: please refer to Figures 1-9 The application provides a technical solution: an energy-saving multistage pump, comprising a bottom shell 1, a top shell 2, a motor 3 and a main shaft 4, a moving impeller 5 movably sleeved on the outer side of the main shaft 4, a connecting impeller 7 sleeved on the outer side of the main shaft 4, a fixed impeller 6 arranged between the moving impeller 5 and the connecting impeller 7 and sleeved on the outer side of the main shaft 4, a plurality of rotating rods 11 arranged in the inside of the moving impeller 5 and penetrating through the moving impeller 5, the fixed impeller 6 and the connecting impeller 7, the plurality of rotating rods 11 movably arranged in the inside of the moving impeller 5, a telescopic deformation mechanism 8 arranged between the moving impeller 5 and the fixed impeller 6 and used for adjusting the distance between the fixed impeller 6 and the moving impeller 5, a groove adjusting mechanism 9 arranged between the fixed impeller 6 and the connecting impeller 7 and used for adjusting the groove depth between the fixed impeller 6 and the connecting impeller 7, and a main control mechanism 10 arranged at the end of the bottom shell 1 and connected with the plurality of rotating rods 11 and used for driving the telescopic deformation mechanism 8 and the groove adjusting mechanism 9 to work.

[0031] The spacing adjustment between the movable impeller 5 and the fixed impeller 6 is the core of flow control. The movable impeller 5 slides along the rotating rod 11, and the flow passage cross-sectional area is changed by changing the spacing with the fixed impeller 6, thereby regulating the flow. This adjustable structure abandons the traditional single adjustment mode, can accurately match the flow according to the demand, and avoids the motor 3 from being wasted;

[0032] The rotating rod 11 penetrates through multiple parts to realize linkage regulation, which is the key to connecting the main control mechanism 10 and the execution mechanism. It is circumferentially distributed on the outside of the main shaft 4, one end is connected to the rotating disc 102 to receive power, and the other end penetrates through the movable impeller 5, the fixed impeller 6 and other components, driving the movable impeller 5 to slide while driving the groove adjusting mechanism 9.

[0033] The telescopic deformation mechanism 8 includes multiple connecting shells 81 arranged at the end of the movable impeller 5, and multiple fixed plates 82 arranged at the end of the fixed impeller 6 close to the movable impeller 5. The side edges of the multiple fixed plates 82 are each provided with a sliding plate 83, and the multiple sliding plates 83 are respectively movably arranged inside the corresponding connecting shells 81. The end of the movable impeller 5 is provided with a sleeve ring 86 connected with the multiple connecting shells 81, and the sleeve ring 86 is movably arranged on the outside of the main shaft 4.

[0034] The connecting shells 81 are fixed to the movable impeller 5, and the sliding plates 83 are arranged on the fixed plates 82 of the fixed impeller 6. The two slidingly guide the linear motion of the movable impeller 5. The matching of the sliding grooves 84 and the reinforcing ribs 85 enhances the structural strength, limits the movement direction, and avoids adjustment deviation. This precise spacing adjustment can optimize the speed and pressure distribution of the fluid flowing through the impeller, and realize accurate flow control.

[0035] Multiple sliding grooves 84 are arranged on the outside of the sliding plates 83, and multiple reinforcing ribs 85 movably connected with the sliding grooves 84 are arranged on the inside of the connecting shells 81. The end of the fixed impeller 6 is provided with a connecting ring 87 connected with the fixed plate 82, and the connecting ring 87 is arranged on the outside of the main shaft 4.

[0036] The groove adjusting mechanism 9 includes multiple rotating plates 91 arranged at the end of the fixed impeller 6 and connected with the connecting impeller 7. The multiple rotating plates 91 are each movably provided with an arc-shaped groove plate 93. The end of the fixed impeller 6 is provided with a mounting cylinder 95 connected with the multiple rotating plates 91, and the mounting cylinder 95 is arranged on the outside of the main shaft 4.

[0037] The inside of the arc-shaped groove plate 93 is provided with a baffle 96, and the inside of the arc-shaped groove plate 93 is movably provided with an arc-shaped plate 94. The side surface of the baffle 96 and the arc-shaped plate 94 are provided with a spring 97. The side edge of the rotating plate 91 is provided with a T-shaped plate 92, and the inside of the arc-shaped plate 94 is movably arranged on the outside of the T-shaped plate 92.

[0038] The elastic cooperation of the arc-shaped plate 94 and the spring 97 enhances the adaptability of the flow channel. When the arc-shaped groove plate 93 moves, the arc-shaped plate 94 slides under the guidance of the T-shaped plate, and the spring 97 can elastically adjust the position of the arc-shaped plate 94 according to the fluid pressure, further optimizing the profile of the flow channel. This flexible structure can buffer the fluctuations in fluid pressure, avoid imbalance in the action of the impeller and the fluid, reduce uneven stress between components, and thus reduce operating noise and vibration.

[0039] The outer side of the mounting cylinder 95 is provided with a connecting clamp 914, the inner side of the connecting clamp 914 is rotatably provided with a rotating rod 919, the outer surface of the inner side of the rotating rod 919 is sleeved with a gear 918, the end of the rotating rod 919 penetrates through the inner side of the connecting clamp 914 and is provided with a limiting disc 917, and the outer side of the connecting clamp 914 is wound with a steel wire 916, and the end of the steel wire 916 is provided with a fixed column 915 connected with the inner side of the arc-shaped groove plate 93.

[0040] The two sides of the connecting clamp 914 are provided with special-shaped plates 913, the side surfaces of the two special-shaped plates 913 are provided with fixed clamps 912, the inner sides of the two fixed clamps 912 are movably provided with guide blocks 911, the guide blocks 911 are provided with a rack 910 engaged with the gear 918, the top of the rack 910 is provided with a straight plate 99, and the outer side of the straight plate 99 is provided with a mounting clamp 98 connected with the outer side of the rotating rod 11.

[0041] The engagement of the rack 910 and the gear 918 realizes the conversion of the motion direction and guarantees the cooperation of multiple mechanisms. The rack 910 moves axially along with the rotating rod 11, drives the gear 918 to rotate through the tooth surface, converts the linear power into the circumferential motion of the rotating rod 919, drives the steel wire 916 to adjust the arc-shaped groove plate 93, and the guide blocks 911 limit the motion direction of the rack 910, ensuring accurate transmission.

[0042] The rotating plate 91 is fixed to the mounting cylinder 95, and the arc-shaped groove plate 93 is movably arranged between the rotating plate 91, and the change of the position of the arc-shaped groove plate 93 directly changes the shape of the flow channel. The mechanism is linked with the telescopic deformation mechanism 8, can optimize the flow channel according to the change of the flow, reduce the fluid impact and vortex, balance the action relationship between the impeller and the fluid, and relieve the vibration problem caused by the overload from the root.

[0043] The main control mechanism 10 includes a sealing disc 101 arranged on the end of the main shaft 4 and the inner side of the rotating rod 11, the end of the rotating rod 11 is provided with a rotating disc 102, the end of the rotating disc 102 is provided with a ring groove 103, and the end of the rotating disc 102 and the inner side of the ring groove 103 are provided with a moving clamp 104.

[0044] The side edge of the moving clamp 104 is provided with an L-shaped rod 105, the bottom end of the L-shaped rod 105 is provided with a fixed block 106, the inside of the fixed block 106 is screw-threaded with a screw rod 107 movably connected with the bottom shell 1, and the end of the screw rod 107 is provided with a knob 108.

[0045] The knob 108 manually drives the screw rod 107 to rotate, drives the fixed block 106, the L-shaped rod and the moving clamp 104 to move through threaded transmission, and then drives the rotating disc 102 and the rotating rod 11 to move. The threaded transmission has self-locking property, can stably maintain the adjusted position, and avoids parameter rebound caused by vibration. This manual control mode is simple and reliable, can be flexibly adjusted according to real-time working conditions, and is suitable for on-site operation requirements.

[0046] Working principle: when the device is used, first, the flow is adjusted. The screw rod 107 is driven to rotate by rotating the knob 108, the fixed block 106 is driven to move, the L-shaped rod 105 and the moving clamp 104 are driven to move, the moving clamp 104 drives the rotating disc 102 to move, and the rotating disc 102 is in a rotating state. The rotating disc 102 drives the rotating rod 11 to move, the rotating rod 11 drives the outer moving impeller 5 to move, the moving impeller 5 drives the connecting shell 81 to slide from the outer side of the sliding plate 83, the gap between the moving impeller 5 and the fixed impeller 6 is increased, and the flow of various water flows can be accurately adjusted.

[0047] When the rotating rod 11 moves, the mounting clamp 98 is driven to move, the straight plate 99 is driven to move, the straight plate 99 drives the rack 910 at the bottom to move, the guide block 911 outside the rack 910 slides inside the fixed clamp 912, the rack 910 drives the gear 918 to rotate through the tooth surface when moving, the gear 918 drives the rotating rod 919 inside to rotate, the rotating rod 919 drives the steel wire 916 to lengthen, the fixed column 915 also moves, the arc-shaped groove plate 93 moves outward, drives the arc-shaped plate 94 inside to slide on the outer surface of the T-shaped plate 92, the T-shaped plate 92 can guide and prevent the arc-shaped plate 94 from disengaging, the arc-shaped plate 94 moves through the extrusion force of the spring 97, and under the action of the spring 97, the arc-shaped groove plate 93 also moves with the arc-shaped plate 94. This causes the water flow into the groove between the two rotating plates 91 to be smaller, thereby reducing the overall vibration and noise during use. Through cooperation with the moving impeller 5 and the fixed impeller 6, the water flow can be accurately controlled, and the noise caused by increasing the water flow can be reduced.

[0048] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting, since the scope of the present application will be limited to the appended claims. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be apparent to one of ordinary skill in the art that many embodiments of the application can be made without departing from the spirit or scope of the application. Numerous specific details are described in order to provide a thorough understanding of the embodiments of the application. However, it will be apparent to one of ordinary skill in the art that embodiments of the present application can be practiced without many of these specific details. In other instances, well-known methods, procedures and components have not been described in detail so as not to unnecessarily obscure aspects of the embodiments of the application. In an effort to provide a concise description of these embodiments, the terms "including", "containing" or "comprising", and variations thereof, do not inherently mean that the enumerated

[0049] While the embodiments of the application have been shown and described herein, it will be understood by those of ordinary skill in the art that many modifications, changes, replacements, and variations can be made to the embodiments without departing from the spirit and scope of the application.

Claims

1. An energy-saving multistage pump, comprising a bottom casing (1), a top casing (2), a motor (3), and a main shaft (4), wherein a movable impeller (5) is movably sleeved on the outer side of the main shaft (4), characterized in that: A connecting impeller (7) is sleeved on the outside of the main shaft (4). A fixed impeller (6) is provided between the moving impeller (5) and the connecting impeller (7), and the fixed impeller (6) is sleeved on the outside of the main shaft (4). Multiple rotating rods (11) are provided on the inner sides of the bottom shell (1) and the top shell (2), respectively penetrating the moving impeller (5), the fixed impeller (6) and the connecting impeller (7). The multiple rotating rods (11) are movably arranged on the inner side of the moving impeller (5). A telescopic deformation mechanism (8) is provided between the moving impeller (5) and the fixed impeller (6) for adjusting the distance between the fixed impeller (6) and the moving impeller (5). A groove adjustment mechanism (9) is provided between the fixed impeller (6) and the connecting impeller (7) for adjusting the groove depth between them. A main control mechanism (10) connected to the multiple rotating rods (11) is provided at the end of the bottom shell (1) for driving the telescopic deformation mechanism (8) and the groove adjustment mechanism (9) to work. The groove adjustment mechanism (9) includes multiple rotating plates (91) disposed at the end of the fixed impeller (6) and connected to the connecting impeller (7). An arc-shaped groove plate (93) is movably disposed between the multiple rotating plates (91). The end of the fixed impeller (6) is provided with a mounting cylinder (95) connected to the multiple rotating plates (91). The mounting cylinder (95) is sleeved on the outside of the main shaft (4). A baffle (96) is provided on the inner side of the arc-shaped groove plate (93), an arc plate (94) is movably provided on the inner side of the arc-shaped groove plate (93), a spring (97) is provided between the side of the baffle (96) and the arc plate (94), a T-shaped plate (92) is provided on the side of the rotating plate (91), and the interior of the arc plate (94) is movably provided on the outside of the T-shaped plate (92); A connecting clamp (914) is provided on the outer side of the mounting cylinder (95). A rotating rod (919) is rotatably provided on the inner side of the connecting clamp (914). A gear (918) is sleeved on the outer surface of the inner side of the rotating rod (919). A limit plate (917) is provided through the inner side of the connecting clamp (914) at the end of the rotating rod (919). A steel rope (916) is wound around the outer side of the connecting clamp (914). A fixing post (915) is provided at the end of the steel rope (916) and connected to the inner side of the arc-shaped groove plate (93). The connecting clamp (914) is provided with a special-shaped plate (913) on both sides, and a fixing clamp (912) is provided on the side of each of the two special-shaped plates (913). A guide block (911) is movably provided on the inner side of each of the two fixing clamps (912). A rack (910) that meshes with the gear (918) is provided between the two guide blocks (911). A straight plate (99) is provided on the top of the rack (910). An installation clamp (98) that connects to the outside of the straight plate (99) and the outside of the rotating rod (11) is provided.

2. The energy-saving multistage pump according to claim 1, characterized in that: The telescopic deformation mechanism (8) includes multiple connecting shells (81) disposed at the end of the movable impeller (5). The fixed impeller (6) is provided with multiple fixed plates (82) at the end near the movable impeller (5). Each of the multiple fixed plates (82) is provided with a sliding plate (83) on its side. The multiple sliding plates (83) are respectively movably disposed inside the corresponding connecting shell (81). The end of the movable impeller (5) is provided with a collar (86) connected to the multiple connecting shells (81). The collar (86) is movably sleeved on the outside of the main shaft (4).

3. The energy-saving multistage pump according to claim 2, characterized in that: The outer side of the slide plate (83) is provided with multiple slide grooves (84), the inner side of the connecting shell (81) is provided with reinforcing ribs (85) that are movably connected to the multiple slide grooves (84), the end of the fixed impeller (6) is provided with a connecting ring (87) that is connected to the fixed plate (82), and the connecting ring (87) is sleeved on the outer side of the main shaft (4).

4. The energy-saving multistage pump according to claim 1, characterized in that: The main control mechanism (10) includes a sealing disk (101) disposed at the end of the main shaft (4) and inside the rotating rod (11). A rotating disk (102) is disposed at the end of the rotating rod (11). An annular groove (103) is opened at the end of the rotating disk (102). A movable clamp (104) is disposed at the end of the rotating disk (102) and inside the annular groove (103).

5. The energy-saving multistage pump according to claim 4, characterized in that: The movable clamp (104) is provided with an L-shaped rod (105) on its side, and a fixing block (106) is provided at the bottom end of the L-shaped rod (105). The fixing block (106) is provided with a screw (107) that is movably connected to the bottom shell (1) through its internal thread, and a knob (108) is provided at the end of the screw (107).

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