A high-power variable displacement variable speed pump

Abstract

This invention discloses a high-power variable amplitude speed pump, belonging to the field of water pump technology. It includes a pressure chamber, an impeller, a rotating shaft, and an inlet pipe. The impeller is symmetrical about the rotation axis. Its key feature is the inclusion of movable and fixed guide vanes, both housed within the pressure chamber. The movable guide vanes are distributed around the outer periphery of the impeller and rotate around the rotation axis to adjust their opening. The fixed guide vanes are distributed around the outer periphery of the movable guide vanes. The impeller includes an upper cover plate, a lower cover plate, and blades. The blade thickness cross-section is eccentrically distributed in a tadpole shape. The impeller inlet is connected to the outlet of the inlet pipe, and the impeller outlet is connected to the inlet of the movable guide vanes. By adding movable guide vanes and a specifically structured impeller, this invention enables the entire impeller to adapt to changes in fluid flow under different power levels, significantly increasing the power adjustment range of the variable speed pump. This, in turn, facilitates the application of multi-energy complementary systems involving wind, solar, hydro, and storage.

Description

Technical Field

[0001] This invention relates to the field of water pump technology, and in particular to a high-power variable amplitude and variable speed pump. Background Technology

[0002] The purpose of a water pump is to transport water from one place to another, or to increase pressure and convert the mechanical energy of a prime mover into the energy of the water. The working principle of a water pump is as follows: After the pump is started, the impeller rotates at high speed within the pump body. The liquid inside the pump body rotates along with the impeller. Under the action of centrifugal force, the liquid is thrown out by the impeller at the outlet. The thrown liquid gradually slows down in the diffuser chamber of the pump body. After being thrown out, a vacuum low-pressure zone is formed at the center of the impeller. The liquid in the pool flows into the pump through the inlet pipe under the action of external atmospheric pressure. The volume of the diffuser chamber is constant. As the amount of water thrown out increases, the pressure gradually increases, and finally, it is discharged from the pump's discharge chamber. In this way, liquid is continuously drawn up from the lower reservoir and then continuously pumped from the pump's discharge chamber to the upper reservoir.

[0003] Wind and solar power generation are highly unpredictable, with daily output varying from 0 kW to full capacity, and are greatly affected by weather conditions. These fluctuations pose significant safety risks to the power grid. To build a new power system, a high proportion of renewable energy must be integrated. However, existing variable-speed energy storage pumps have limited power output and cannot meet the demands of the rapid development of new energy sources.

[0004] Chinese patent document CN214741837U, published on November 16, 2021, discloses an underwater vacuum energy storage peak-shaving system employing a reversible water pump turbine. The system comprises an offshore wind turbine generator set and an underwater vacuum energy storage system. The offshore wind turbine generator set includes an offshore wind turbine, the output of which is connected to the power grid via a transformer. The underwater vacuum energy storage system includes a reversible water pump turbine motor connected to the power grid. The reversible water pump turbine motor is connected to the reversible water pump turbine, which is housed inside a concrete vacuum energy storage device. The concrete vacuum energy storage device is equipped with a main inlet pipe connected to the external seawater environment. The main inlet pipe is connected to a water intake pipe installed inside the concrete vacuum energy storage device via a main water intake control valve. The water intake pipe is connected to the reversible water pump turbine.

[0005] The patent document discloses an underwater vacuum energy storage peak-shaving system using a reversible energy storage pump-turbine. However, the reversible energy storage pump-turbine cannot adjust the input in real time to match the constantly changing output of wind power, photovoltaic power, and water head due to the influence of operating conditions. The power adjustment range is small, and it cannot realize the application of a multi-energy complementary system of wind, solar, water, and storage. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, this invention provides a high-power variable amplitude and variable speed pump. By adding movable guide vanes and an impeller with a specific structure, this invention enables the entire impeller to adapt to changes in fluid under different power levels, greatly increasing the power adjustment range of the variable speed pump, which in turn facilitates the application of multi-energy complementary systems of wind, solar, hydro, and storage.

[0007] This invention is achieved through the following technical solution:

[0008] A high-power variable amplitude and variable speed pump includes a pressure chamber, an impeller, a rotating shaft, and an inlet pipe. The impeller is located in the middle of the pressure chamber and is symmetrical about the rotation axis. The pump is characterized by further including movable guide vanes and fixed guide vanes. Both the fixed and movable guide vanes are disposed within the pressure chamber. The movable guide vanes are distributed on the outer periphery of the impeller and are symmetrically distributed about the rotation axis. The movable guide vanes rotate around the rotation axis to adjust their opening degree. The fixed guide vanes are distributed on the outer periphery of the movable guide vanes. The impeller includes an upper cover plate, a lower cover plate, and blades connecting the upper and lower cover plates. The blades have an eccentric tadpole-shaped cross-section. The inlet of the impeller is connected to the outlet of the inlet pipe, and the outlet of the impeller is connected to the inlet of the movable guide vanes.

[0009] The eccentric tadpole-like distribution of the blade thickness cross section specifically refers to the eccentric circular arc curve at the blade tip, with a thickness deviation of 5%-30%, and the thickness gradually changing.

[0010] The blade includes a head and a tail, with the tail being a crescent-shaped curve.

[0011] The thickness of the blade head is greater than the thickness of the blade tail.

[0012] The thickness of the blade transitions linearly in the middle.

[0013] The blade includes a pressure surface and a suction surface, with the pressure surface located on one side of the blade and the suction surface located on the other side of the blade.

[0014] The pressure surface of the blade head region is 5%-30% thicker than the suction surface.

[0015] The beneficial effects of this invention are mainly reflected in the following aspects:

[0016] 1. In this invention, both fixed and movable guide vanes are installed in the pressure chamber. The movable guide vanes are distributed on the outer periphery of the impeller and are symmetrically distributed around the rotation axis. The movable guide vanes rotate around the rotation axis to adjust their opening. The fixed guide vanes are distributed on the outer periphery of the movable guide vanes. The impeller includes an upper cover plate, a lower cover plate, and blades connected between the upper and lower cover plates. The blade thickness cross-section is eccentrically distributed in a tadpole shape. The inlet of the impeller is connected to the outlet of the inlet pipe, and the outlet of the impeller is connected to the inlet of the movable guide vane. Compared with the prior art, by adding movable guide vanes and an impeller with a specific structure, the entire impeller can adapt to changes in fluid under different power levels, greatly increasing the power adjustment range of the variable speed pump, which is conducive to the application of a multi-energy complementary system of wind, solar, hydro, and storage.

[0017] 2. This invention, by adding movable guide vanes, positions them symmetrically around the rotation axis between the fixed guide vanes and the impeller. The movable guide vanes can rotate around their own rotation axis to adjust their opening. Compared with existing pump structures, the movable guide vanes control the flow rate by changing the opening, ensuring smooth fluid flow under different operating conditions, effectively improving the overall performance of the variable speed pump, optimizing the flow-head curve, improving hump characteristics, and ensuring stable operation of the unit.

[0018] 3. In this invention, the blade thickness cross section is distributed in an eccentric tadpole shape. Compared with conventional impellers, the blade has a smaller curvature and a smaller wrap angle. The tail is straight or oblique, and the head is thinner. Compared with the symmetrical distribution of the blade strands, the blade strands of this invention have the characteristics of large curvature and large wrap angle, which makes the impeller have high hump margin, high efficiency and high cavitation performance.

[0019] 4. This invention, through the realization of ultra-high power amplitude range function, enables the variable speed pump to absorb the fluctuating electrical energy generated by wind power and photovoltaic new energy. By reasonably matching the pump capacity with the wind power and photovoltaic capacity, it can absorb the electrical energy generated by new energy, thereby effectively reducing the curtailment rate of wind power and photovoltaic.

[0020] 5. This invention, through improved cavitation performance, requires only 1 / 3 of the suction height required by a variable speed pumped storage unit, greatly reducing the amount of excavation and directly saving 20%-30% of the construction cost of the pumping station, while extending the service life of the unit.

[0021] 6. This invention, through the realization of the ultra-large power amplitude range function, can continuously adjust the force to match the ever-changing output of photovoltaic power, thereby better realizing the application of wind-solar-storage multi-energy complementary system.

[0022] 7. This invention, through the realization of ultra-high power amplitude range function, can convert the stored water energy into hydroelectricity using a hydropower unit and transmit it to the power grid, or use gravitational potential energy to achieve long-distance water transportation, thereby helping to solve the electricity and water problems in desert areas.

[0023] 8. This invention, through the realization of ultra-high power amplitude range function, absorbs large-scale electrical energy generated by wind power and photovoltaic power, thereby protecting the stability of the power grid and reducing the impact of fluctuating electrical energy generated by new energy sources on the power grid.

[0024] 9. This invention, through the realization of ultra-high power amplitude range function, absorbs electrical energy generated by wind power and photovoltaic power on a large scale, converts electrical energy into the potential energy of water, raises the water level of the reservoir, optimizes the operating range of conventional hydropower units, improves the power generation efficiency of conventional hydropower units, and enhances the safety and stability of the units.

[0025] 10. This invention, through the realization of the ultra-high power amplitude range function, can be connected to an isolated grid for operation, and is suitable for environments with high frequency changes and large water level fluctuations, maintaining the safe and stable operation of the unit. Attached Figure Description

[0026] The present invention will now be further described in detail with reference to the accompanying drawings and specific embodiments, wherein:

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the movable guide vane structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the impeller structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the blade strands of the present invention;

[0031] Figure 5 This is a schematic diagram of the blade structure of the present invention;

[0032] The markings in the diagram are: 1. Pressure chamber, 2. Fixed guide vane, 3. Movable guide vane, 4. Impeller, 5. Inlet pipe, 6. Blade, 7. Upper cover plate, 8. Lower cover plate, 9. Blade strands, 10. Head, 11. Tail, 12. Pressure surface, 13. Suction surface, 14. Rotating shaft. Detailed Implementation

[0033] Example 1

[0034] See Figures 1-3A high-power variable amplitude and variable speed pump includes a pressure chamber 1, an impeller 4, a rotating shaft 14, and an inlet pipe 5. The impeller 4 is located in the middle of the pressure chamber 1 and is symmetrical about the rotating shaft 14. It also includes movable guide vanes 3 and fixed guide vanes 2. Both the fixed guide vanes 2 and the movable guide vanes 3 are arranged in the pressure chamber 1. The movable guide vanes 3 are distributed on the outer periphery of the impeller 4 and are symmetrically distributed about the rotating shaft 14. The movable guide vanes 3 rotate around the rotating shaft 14 to adjust their opening. The fixed guide vanes 2 are distributed on the outer periphery of the movable guide vanes 3. The impeller 4 includes an upper cover plate 7, a lower cover plate 8, and blades 6 connected between the upper cover plate 7 and the lower cover plate 8. The thickness cross section of the blades 6 is eccentrically distributed like a tadpole. The inlet of the impeller 4 is connected to the outlet of the inlet pipe 5, and the outlet of the impeller 4 is connected to the inlet of the movable guide vanes 3.

[0035] This embodiment is the most basic implementation method. Compared with the prior art, by adding movable guide vanes 3 and impeller 4 with a specific structure, the entire impeller 4 can adapt to the changes in fluid under different power, which greatly increases the power adjustment range of the variable speed pump, and thus facilitates the application of wind, solar, water and storage multi-energy complementary system.

[0036] Taking a single unit with a capacity of 300,000 KW as an example, conventional variable speed pumps can only achieve a power adjustment range of 10%-30% under different head conditions, while the present invention can increase the power adjustment range to 40%-60%. The optimal efficiency of the actual machine is increased from 93.06% of the conventional variable speed pump to 94.13%, an increase of 1.07%.

[0037] Example 2

[0038] See Figures 1-3 A high-power variable amplitude and variable speed pump includes a pressure chamber 1, an impeller 4, a rotating shaft 14, and an inlet pipe 5. The impeller 4 is located in the middle of the pressure chamber 1 and is symmetrical about the rotating shaft 14. It also includes movable guide vanes 3 and fixed guide vanes 2. Both the fixed guide vanes 2 and the movable guide vanes 3 are arranged in the pressure chamber 1. The movable guide vanes 3 are distributed on the outer periphery of the impeller 4 and are symmetrically distributed about the rotating shaft 14. The movable guide vanes 3 rotate around the rotating shaft 14 to adjust their opening. The fixed guide vanes 2 are distributed on the outer periphery of the movable guide vanes 3. The impeller 4 includes an upper cover plate 7, a lower cover plate 8, and blades 6 connected between the upper cover plate 7 and the lower cover plate 8. The thickness cross section of the blades 6 is eccentrically distributed like a tadpole. The inlet of the impeller 4 is connected to the outlet of the inlet pipe 5, and the outlet of the impeller 4 is connected to the inlet of the movable guide vanes 3.

[0039] The eccentric tadpole-shaped distribution of the thickness cross section of the blade 6 specifically means that the head 10 of the blade 6 is an eccentric circular arc curve with a thickness deviation of 5% and a gradually changing thickness.

[0040] This embodiment is a preferred implementation. By adding a movable guide vane 3, the movable guide vane 3 is located between the fixed guide vane 2 and the impeller 4, and is symmetrically distributed around the rotation axis 14. The movable guide vane 3 can rotate around its own rotation axis 14 to adjust the opening. Compared with the existing pump structure, the movable guide vane 3 controls the flow rate by changing the opening, so that the fluid flow of the variable speed pump is stable under different operating conditions, effectively improving the overall performance of the variable speed pump, optimizing the flow-head line, improving the hump characteristics, and ensuring the stable operation of the unit.

[0041] Example 3

[0042] See Figures 1-4 A high-power variable amplitude and variable speed pump includes a pressure chamber 1, an impeller 4, a rotating shaft 14, and an inlet pipe 5. The impeller 4 is located in the middle of the pressure chamber 1 and is symmetrical about the rotating shaft 14. It also includes movable guide vanes 3 and fixed guide vanes 2. Both the fixed guide vanes 2 and the movable guide vanes 3 are arranged in the pressure chamber 1. The movable guide vanes 3 are distributed on the outer periphery of the impeller 4 and are symmetrically distributed about the rotating shaft 14. The movable guide vanes 3 rotate around the rotating shaft 14 to adjust their opening. The fixed guide vanes 2 are distributed on the outer periphery of the movable guide vanes 3. The impeller 4 includes an upper cover plate 7, a lower cover plate 8, and blades 6 connected between the upper cover plate 7 and the lower cover plate 8. The thickness cross section of the blades 6 is eccentrically distributed like a tadpole. The inlet of the impeller 4 is connected to the outlet of the inlet pipe 5, and the outlet of the impeller 4 is connected to the inlet of the movable guide vanes 3.

[0043] Furthermore, the eccentric tadpole-shaped distribution of the thickness cross section of the blade 6 specifically means that the head 10 of the blade 6 is an eccentric circular arc curve with a thickness deviation of 10% and a gradually changing thickness.

[0044] The blade 6 includes a head 10 and a tail 11, and the tail 11 of the blade 6 is a crescent-shaped curve.

[0045] This embodiment is another preferred implementation. The thickness cross section of the blade 6 is distributed in an eccentric tadpole shape. Compared with the conventional impeller 4, the curvature is small and the wrap angle is small. The tail 11 is a straight line or a diagonal line, and the head 10 is thinner. Compared with the symmetrical distribution of the strands, the blade strands 9 of the present invention have the characteristics of large curvature and large wrap angle, which makes the impeller 4 have high hump margin, high efficiency and high cavitation performance.

[0046] By achieving an ultra-wide power range, the variable speed pump can absorb the fluctuating electrical energy generated by wind power and photovoltaic new energy sources. Through a reasonable ratio of pump capacity to wind power and photovoltaic capacity, it can absorb the electrical energy generated by new energy sources, thereby effectively reducing the curtailment rate of wind power and photovoltaic power.

[0047] Example 4

[0048] See Figures 1-5A high-power variable amplitude and variable speed pump includes a pressure chamber 1, an impeller 4, a rotating shaft 14, and an inlet pipe 5. The impeller 4 is located in the middle of the pressure chamber 1 and is symmetrical about the rotating shaft 14. It also includes movable guide vanes 3 and fixed guide vanes 2. Both the fixed guide vanes 2 and the movable guide vanes 3 are arranged in the pressure chamber 1. The movable guide vanes 3 are distributed on the outer periphery of the impeller 4 and are symmetrically distributed about the rotating shaft 14. The movable guide vanes 3 rotate around the rotating shaft 14 to adjust their opening. The fixed guide vanes 2 are distributed on the outer periphery of the movable guide vanes 3. The impeller 4 includes an upper cover plate 7, a lower cover plate 8, and blades 6 connected between the upper cover plate 7 and the lower cover plate 8. The thickness cross section of the blades 6 is eccentrically distributed like a tadpole. The inlet of the impeller 4 is connected to the outlet of the inlet pipe 5, and the outlet of the impeller 4 is connected to the inlet of the movable guide vanes 3.

[0049] The eccentric tadpole-shaped distribution of the thickness cross section of the blade 6 specifically means that the head 10 of the blade 6 is an eccentric circular arc curve with a thickness deviation of 15% and a gradually changing thickness.

[0050] The blade 6 includes a head 10 and a tail 11, and the tail 11 of the blade 6 is a crescent-shaped curve.

[0051] The thickness of the head 10 of the blade 6 is greater than the thickness of the tail 11 of the blade 6.

[0052] The thickness of the blade 6 transitions in a straight line in the middle.

[0053] This embodiment is another preferred implementation method. By improving cavitation performance, the required suction height is only one-third of that required by the variable speed pumped storage unit, which greatly reduces the amount of excavation, directly saves 20%-30% of the construction cost of the pump station, and extends the service life of the unit.

[0054] Example 5

[0055] See Figures 1-5 A high-power variable amplitude and variable speed pump includes a pressure chamber 1, an impeller 4, a rotating shaft 14, and an inlet pipe 5. The impeller 4 is located in the middle of the pressure chamber 1 and is symmetrical about the rotating shaft 14. It also includes movable guide vanes 3 and fixed guide vanes 2. Both the fixed guide vanes 2 and the movable guide vanes 3 are arranged in the pressure chamber 1. The movable guide vanes 3 are distributed on the outer periphery of the impeller 4 and are symmetrically distributed about the rotating shaft 14. The movable guide vanes 3 rotate around the rotating shaft 14 to adjust their opening. The fixed guide vanes 2 are distributed on the outer periphery of the movable guide vanes 3. The impeller 4 includes an upper cover plate 7, a lower cover plate 8, and blades 6 connected between the upper cover plate 7 and the lower cover plate 8. The thickness cross section of the blades 6 is eccentrically distributed like a tadpole. The inlet of the impeller 4 is connected to the outlet of the inlet pipe 5, and the outlet of the impeller 4 is connected to the inlet of the movable guide vanes 3.

[0056] The eccentric tadpole-shaped distribution of the thickness cross section of the blade 6 specifically means that the head 10 of the blade 6 is an eccentric circular arc curve with a thickness deviation of 25% and a gradually changing thickness.

[0057] The blade 6 includes a head 10 and a tail 11, and the tail 11 of the blade 6 is a crescent-shaped curve.

[0058] The thickness of the head 10 of the blade 6 is greater than the thickness of the tail 11 of the blade 6.

[0059] The thickness of the blade 6 transitions in a straight line in the middle.

[0060] Furthermore, the blade 6 includes a pressure surface 12 and a suction surface 13, with the pressure surface 12 located on one side of the blade 6 and the suction surface 13 located on the other side of the blade 6.

[0061] This embodiment is another preferred implementation. By realizing the ultra-large power amplitude range function, the force can be continuously adjusted to match the ever-changing output of photovoltaic power, thereby better realizing the application of wind-solar-storage multi-energy complementary system.

[0062] By realizing the ultra-high power amplitude range function, the stored water energy can be converted into hydroelectricity by the hydropower unit and transmitted to the power grid, or the water can be transported over long distances by using gravitational potential energy, thus helping to solve the electricity and water problems in desert areas.

[0063] Example 6

[0064] See Figures 1-5 A high-power variable amplitude and variable speed pump includes a pressure chamber 1, an impeller 4, a rotating shaft 14, and an inlet pipe 5. The impeller 4 is located in the middle of the pressure chamber 1 and is symmetrical about the rotating shaft 14. It also includes movable guide vanes 3 and fixed guide vanes 2. Both the fixed guide vanes 2 and the movable guide vanes 3 are arranged in the pressure chamber 1. The movable guide vanes 3 are distributed on the outer periphery of the impeller 4 and are symmetrically distributed about the rotating shaft 14. The movable guide vanes 3 rotate around the rotating shaft 14 to adjust their opening. The fixed guide vanes 2 are distributed on the outer periphery of the movable guide vanes 3. The impeller 4 includes an upper cover plate 7, a lower cover plate 8, and blades 6 connected between the upper cover plate 7 and the lower cover plate 8. The thickness cross section of the blades 6 is eccentrically distributed like a tadpole. The inlet of the impeller 4 is connected to the outlet of the inlet pipe 5, and the outlet of the impeller 4 is connected to the inlet of the movable guide vanes 3.

[0065] The eccentric tadpole-shaped distribution of the thickness cross section of the blade 6 specifically means that the head 10 of the blade 6 is an eccentric circular arc curve with a thickness deviation of 30% and a gradually changing thickness.

[0066] The blade 6 includes a head 10 and a tail 11, and the tail 11 of the blade 6 is a crescent-shaped curve.

[0067] The thickness of the head 10 of the blade 6 is greater than the thickness of the tail 11 of the blade 6.

[0068] The thickness of the blade 6 transitions in a straight line in the middle.

[0069] The blade 6 includes a pressure surface 12 and a suction surface 13. The pressure surface 12 is located on one side of the blade 6, and the suction surface 13 is located on the other side of the blade 6.

[0070] The pressure surface 12 of the head region 10 of the blade 6 is 30% thicker than the suction surface 13.

[0071] This embodiment is the optimal implementation method. By realizing the ultra-high power amplitude range function, it absorbs the electrical energy generated by wind power and photovoltaic power on a large scale, thereby protecting the stability of the power grid and reducing the impact of the fluctuating electrical energy generated by new energy sources on the power grid.

[0072] By realizing the ultra-large power amplitude range function, the power generated by wind power and photovoltaic power is absorbed on a large scale and converted into the potential energy of water, raising the water level of the reservoir, optimizing the operating range of conventional hydropower units, improving the power generation efficiency of conventional hydropower units, and enhancing the safety and stability of the units.

[0073] With the realization of the ultra-high power amplitude range function, it can be connected to the isolated grid for operation, which is suitable for high frequency change and large water level fluctuation environment, and maintains the safety and stability of the unit.

[0074] The basic principle of this invention is as follows:

[0075] By adding movable guide vanes 3 to a conventional variable speed pump, the power variation range of the variable speed pump can be increased. Through the innovative design of the conventional impeller 4, a larger power variation target can be achieved, thereby adapting to the characteristics of large output variation in wind power and photovoltaic power.

[0076] Compared with conventional variable speed pumps, the ultra-high power variable amplitude speed pump structure adds a movable guide vane 3 structure to expand the speed range; for ultra-high power variable amplitude speed pumps, an impeller 4 with excellent hump and cavitation performance was developed; the impeller 4 consists of an upper cover plate 7, a lower cover plate 8 and blades 6 connected between the upper cover plate 7 and the lower cover plate 8. The blade strands 9 have multiple curvatures and large wrap angles, the tail 11 of the blades 6 adopts a crescent-shaped curve, and the thickness of the blades 6 is distributed in an eccentric tadpole pattern, thus realizing an ultra-high power variable amplitude speed pump.

Claims

1. A high-power variable amplitude and variable speed pump, comprising a pressure chamber (1), an impeller (4), a rotating shaft (14), and an inlet pipe (5), wherein the impeller (4) is located in the middle of the pressure chamber (1), and the impeller (4) is symmetrical about the rotating shaft (14), characterized in that: It also includes movable guide vanes (3) and fixed guide vanes (2). Both the fixed guide vanes (2) and movable guide vanes (3) are set in the pressure chamber (1). The movable guide vanes (3) are distributed on the outer periphery of the impeller (4). The movable guide vanes (3) are symmetrically distributed around the rotation axis (14). The movable guide vanes (3) rotate around the rotation axis (14) to adjust the opening. The fixed guide vanes (2) are distributed on the outer periphery of the movable guide vanes (3). The impeller (4) includes an upper cover plate (7), a lower cover plate (8), and blades (6) connected between the upper cover plate (7) and the lower cover plate (8). The thickness section of the blades (6) is distributed in an eccentric tadpole shape. The inlet of the impeller (4) is connected to the outlet of the water inlet pipe (5), and the outlet of the impeller (4) is connected to the inlet of the movable guide vanes (3). The thickness section of the blade (6) is eccentrically distributed in a tadpole-like pattern. Specifically, the head (10) of the blade (6) is an eccentric circular arc curve with a thickness deviation of 5%-30%. The thickness is gradually changing, and the blade strands (9) have multiple curvatures and large wrap angles. The blade (6) includes a head (10) and a tail (11), the tail (11) of the blade (6) is a crescent-shaped curve; the middle thickness of the blade (6) is a straight transition.

2. The high-power variable amplitude and variable speed pump according to claim 1, characterized in that: The thickness of the head (10) of the blade (6) is greater than the thickness of the tail (11) of the blade (6).

3. A high-power variable amplitude and variable speed pump according to claim 1, characterized in that: The blade (6) includes a pressure surface (12) and a suction surface (13), with the pressure surface (12) located on one side of the blade (6) and the suction surface (13) located on the other side of the blade (6).

4. A high-power variable amplitude and variable speed pump according to claim 3, characterized in that: The pressure surface (12) of the head (10) region of the blade (6) is 5%-30% thicker than the suction surface (13).

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