Anti-blocking type multi-stage energy-saving centrifugal pump

Abstract

The invention relates to the technical field of centrifugal pumps, and discloses an anti-blocking multistage energy-saving centrifugal pump which comprises a pump shell, the pump shell comprises an upper shell body and a lower shell body, a first liquid storage cavity is fixedly installed at the upper end of the interior of the upper shell body, and a second liquid storage cavity is fixedly installed at the upper end of the interior of the lower shell body; and inner cylinders are rotationally installed in the upper shell and the lower shell and located below the first liquid storage cavity and the second liquid storage cavity correspondingly, the two inner cylinders are symmetrically arranged, a water inlet pipe is fixedly installed on the outer wall of the upper half portion of the upper shell, and a water outlet pipe is fixedly installed on the outer wall of the upper half portion of the lower shell. According to the multi-stage pressurizing pump, multi-stage pressurizing conveying of water flow in the pump body is achieved through rotation of the multiple sets of impellers, the first protruding blocks and the second protruding blocks are fixedly installed on the outer walls of the tail ends of the blades, vortex and flowing separation of water flow at the tail ends of the blades can be restrained, and hydraulic losses are reduced; and meanwhile, the blade surface flow state can be adjusted, and mechanical energy loss caused by viscous friction resistance is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of centrifugal pumps, and particularly relates to a multi-stage energy-saving centrifugal pump capable of preventing blockage. BACKGROUND

[0002] At present, the multi-stage centrifugal pumps widely used in industrial production and environmental protection fields generally face two problems of efficiency attenuation and blockage when conveying impurity-containing fluid.

[0003] On one hand, the hydraulic design of the existing pump impeller is often difficult to balance high efficiency and blockage prevention. Although the conventional anti-blocking impeller has wide flow passage, the blade profile is simple, flow separation and vortex are easily generated at the end, and significant hydraulic loss is caused. The high-efficiency design impeller is sensitive to impurities, and is easy to wear and jam. On the other hand, in the long-term operation of the pump, the inner wall and the surface of the impeller are easy to scale or accumulate fiber materials. The existing technology relies on shutdown and cleaning or external complex flushing system, and the maintenance cost is high and the continuous production is affected. In addition, the inherent hydraulic defects of the impeller, such as inlet impact, uneven outlet flow field and cavitation, further restrict the efficiency and stable operation life of the pump. Therefore, we propose a multi-stage energy-saving centrifugal pump capable of preventing blockage. SUMMARY

[0004] The present application mainly solves the technical problems existing in the prior art, and provides a multi-stage energy-saving centrifugal pump capable of preventing blockage.

[0005] In order to achieve the above object, the present application adopts the following technical scheme: a kind of anti-clogging multistage energy-saving centrifugal pump, including pump shell, the pump shell includes upper shell body and lower shell body, the inside upper end of upper shell body is fixedly installed with first liquid storage cavity, the inside upper end of lower shell body is fixedly installed with second liquid storage cavity, the inside of upper shell body and lower shell body is rotatably installed with inner cylinder below first liquid storage cavity and second liquid storage cavity, two inner cylinders are symmetrically arranged, the outer wall of the upper half of upper shell body is fixedly installed with water inlet pipe, the outer wall of the upper half of lower shell body is fixedly installed with water outlet pipe, the outer wall of the terminal of water inlet pipe away from pump shell is fixedly installed with blowdown pipe, the inside of the terminal of water inlet pipe away from pump shell is movably installed with filter assembly and check valve, the inside central position of pump shell is rotatably installed with transmission shaft, the upper surface of pump shell is fixedly installed with servo motor, the output end of servo motor is fixedly connected with the terminal of transmission shaft, the outer wall of transmission shaft access two inner cylinder interiors is movably installed with multiple groups of impeller, impeller is coaxially arranged with transmission shaft and cooperates with the inner chamber of inner cylinder for use;The impeller specifically includes mounting ring, the bottom surface of mounting ring is fixedly installed with back cover plate, the upper surface of back cover plate is fixedly installed with multiple blades, the upper surface of multiple blades is fixedly installed with front cover plate, the central position of front cover plate is provided with water inlet cavity, the upper end of mounting ring extends to the upper of front cover plate by passing the inside of water inlet cavity, the outer wall of one end of blade near mounting ring is fixedly installed with first protrusion and second protrusion respectively;The outer wall of inner cylinder is provided with notch for cooperating with blade, the inside of upper shell body and lower shell body is fixedly installed with flushing pipe for cooperating with notch.

[0006] Preferably, the blade is arranged in a rear-bent arc shape, and the height of the blade gradually decreases from one end near the mounting ring outward.

[0007] Preferably, the inlet angle of the blade ranges from 18° to 25°, the outlet angle of the blade ranges from 20° to 30°, and the wrap angle of the blade ranges from 85° to 110°.

[0008] Preferably, the inner wall of the upper shell body and the lower shell body is provided with a through groove at a position corresponding to the notch provided on the inner cylinder, a spray head is fixedly installed in the through groove, and the spray head is in communication with the inside of the flushing pipe.

[0009] Preferably, the end of the flushing pipe extends to the outside through the upper shell body and the lower shell body, and a connector is fixedly installed at the end of the flushing pipe outside the upper shell body and the lower shell body.

[0010] Preferably, a balance structure is fixedly installed on the inner wall of the lower end of the pump shell, and the inner cylinder is arranged above the balance structure.

[0011] Preferably, a base is fixedly installed on the bottom surface of the pump casing, a support column is fixedly installed at the center of the upper surface of the base, the lower end of the drive shaft extends through the center of the bottom surface of the inner cylinder to the outside of the inner cylinder, and the lower end of the drive shaft is rotatably connected to the upper end of the support column.

[0012] Preferably, a sleeve is fixedly installed on the bottom surface of the inner cylinder. The sleeve is located outside the support column, and the inner wall of the sleeve is fixedly connected to the outer wall of the support column. The lower end of the sleeve extends through the bottom surface of the pump casing to the top of the base and is rotatably connected to the upper surface of the base. A first gear is fixedly installed on the lower outer wall of the sleeve, and a second gear is rotatably installed on the upper surface of the base. The second gear meshes with the first gear.

[0013] Preferably, the base has a mounting groove on its bottom surface, and a connecting shaft is fixedly installed at the center of the bottom surface of the second gear. The connecting shaft is rotatably connected to the base, and the end of the connecting shaft extends through the base into the mounting groove. An adjusting block is fixedly installed at the end of the connecting shaft, and the bottom surface of the adjusting block has an internal hexagonal groove.

[0014] Preferably, a flexible pin that cooperates with the first gear is fixedly installed on the bottom surface of the mounting groove, and a pull block is movably installed on the bottom surface of the flexible pin.

[0015] Beneficial effects This invention provides a clog-resistant, multi-stage energy-saving centrifugal pump. It has the following beneficial effects: (1) This anti-clogging multi-stage energy-saving centrifugal pump achieves multi-stage pressurization and transportation of water flow inside the pump body through the rotation of multiple sets of impellers. The first and second protrusions fixedly installed on the outer wall of the blade end can suppress the eddy current and flow separation of the water flow at the blade end, reducing hydraulic loss; at the same time, it can adjust the flow state on the blade surface, reduce the mechanical energy loss caused by viscous friction resistance; it can also finely adjust the blade outlet angle, making the water flow outlet velocity distribution more uniform, and improving the conversion efficiency of kinetic energy to static pressure energy; in addition, the first and second protrusions can reduce the low-pressure area at the blade end, assist in anti-cavitation, and avoid the efficiency drop caused by cavitation. The setting of the first and second protrusions can reduce energy loss, optimize the flow field and energy conversion, and effectively improve the efficiency of impeller transportation of water flow.

[0016] (2) The anti-clogging multi-stage energy-saving centrifugal pump has blade shape that changes synchronously with the flow channel space, accurately guides and controls the water flow, and the blade inlet angle is controlled within a small range. Its advantage is that the relative velocity direction of the water flow when entering the flow channel is almost coincident with the geometric tangent direction of the blade leading edge, which minimizes the inlet vortex, flow separation and energy loss caused by the collision between the water flow and the blade. The blade outlet angle adopts a 20°-30° backward bending design. This angle allows the fluid to obtain a large circumferential velocity at the outlet, thereby efficiently converting mechanical energy into pressure energy.

[0017] (3) The anti-clogging multi-stage energy-saving centrifugal pump sprays high-pressure water into the inner cylinder through the flushing pipe. The shape of the first and second protrusions set at the end of the blades in the impeller guides the water flow to the gap between the blade end and the outer wall of the mounting ring. The water flow cleans the scale accumulated in the gap, avoiding blockage after long-term use. Attached Figure Description

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic cross-sectional view of the inner cylinder structure of the present invention; Figure 4 This is a schematic diagram showing the structural breakdown of the filter component of the present invention; Figure 5 This is a schematic diagram of the impeller in the cleaned state of the present invention; Figure 6 This is a schematic diagram showing the location distribution of the flushing pipes in this invention; Figure 7 This is a schematic diagram showing the disassembled structure of the impeller and inner cylinder of the present invention; Figure 8 This is a schematic diagram showing the disassembled structure of the front cover plate of the present invention; Figure 9 This is a schematic diagram of the first and second protrusions of the present invention; Figure 10 This is a schematic cross-sectional view of the dilution box structure of the present invention; Figure 11 For the present invention Figure 2 Enlarged schematic diagram of a local structure at point A; Figure 12 For the present invention Figure 3 Enlarged schematic diagram of the local structure at point B; Figure 13 For the present invention Figure 5 Enlarged schematic diagram of the local structure at point C; Figure 14 For the present invention Figure 6 A magnified schematic diagram of the local structure at point D.

[0021] Legend: 1. Pump casing; 101. Upper casing; 102. Lower casing; 103. First liquid storage chamber; 104. Second liquid storage chamber; 2. Outlet pipe; 3. Inlet pipe; 4. Drain pipe; 5. Servo motor; 6. Filter assembly; 7. Check valve; 8. Drive shaft; 9. Impeller; 901. Rear cover plate; 902. Front cover plate; 903. Blade; 904. First protrusion; 905. Second protrusion; 906. Mounting ring; 907. Inlet chamber; 10. Inner cylinder; 11. Base; 12. Flushing pipe; 13. Nozzle; 14. Notch; 15. Connector; 16. Mounting groove; 17. Support column; 18. Sleeve; 19. First gear; 20. Second gear; 21. Connecting shaft; 22. Adjusting block; 23. Elastic pin; 24. Pull block; 25. Balancing structure. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figure 1 - Figure 14As shown, an anti-clogging multi-stage energy-saving centrifugal pump includes a pump casing 1, which comprises an upper casing 101 and a lower casing 102. A first liquid storage chamber 103 is fixedly installed at the upper end of the upper casing 101, and a second liquid storage chamber 104 is fixedly installed at the upper end of the lower casing 102. Inner cylinders 10 are rotatably installed inside the upper casing 101 and the lower casing 102, respectively, below the first liquid storage chamber 103 and the second liquid storage chamber 104. The two inner cylinders 10 are symmetrically arranged. An inlet pipe 3 is fixedly installed on the outer wall of the upper half of the upper casing 101, and an inlet pipe 3 is fixedly installed on the outer wall of the upper half of the lower casing 102. A water outlet pipe 2 is fixedly installed. A sewage pipe 4 is fixedly installed on the outer wall of the end of the water inlet pipe 3 away from the pump casing 1. The sewage pipe 4 is set downward. A filter assembly 6 and a one-way valve 7 are movably installed inside the end of the water inlet pipe 3 away from the pump casing 1. A drive shaft 8 is rotatably installed at the center of the pump casing 1. A servo motor 5 is fixedly installed on the upper surface of the pump casing 1. The output end of the servo motor 5 is fixedly connected to the end of the drive shaft 8. Multiple sets of impellers 9 are movably installed on the outer walls of the two inner cylinders 10. The impellers 9 are coaxial with the drive shaft 8 and cooperate with the inner cavity of the inner cylinder 10. The impeller 9 specifically includes a mounting ring 906, a rear cover plate 901 fixedly mounted on the bottom surface of the mounting ring 906, multiple blades 903 fixedly mounted on the upper surface of the rear cover plate 901, and a front cover plate 902 fixedly mounted on the upper surface of the multiple blades 903. A water inlet cavity 907 is opened at the center of the front cover plate 902. The upper end of the mounting ring 906 extends through the interior of the water inlet cavity 907 to the top of the front cover plate 902. A first protrusion 904 and a second protrusion 905 are fixedly mounted on the outer walls of the two sides of the blades 903 near the mounting ring 906, respectively. The outer walls of the first protrusion 904 and the second protrusion 905 are both arc-shaped. The outer wall of the inner cylinder 10 is provided with a notch 14 that is used to cooperate with the blade 903. The flushing pipes 12 that are used to cooperate with the notch 14 are fixedly installed inside the upper shell 101 and the lower shell 102. By setting multiple sets of impellers 9 at the upper and lower ends inside the pump casing 1, the water flow entering the pump casing 1 is pressurized and discharged outward through the outlet pipe 2. The multiple sets of impellers 9 cooperate with the inner cylinder 10 to improve the water conveying efficiency. The first protrusion 904 and the second protrusion 905 fixedly installed on the outer wall of the blade 903 can suppress the eddy current and flow separation of the water flow at the blade tip, reducing hydraulic loss; at the same time, it can adjust the flow state on the blade surface, reducing the mechanical energy loss caused by viscous friction resistance; it can also fine-tune the blade outlet angle, making the water flow outlet velocity distribution more uniform, and improving the conversion efficiency of kinetic energy to static pressure energy; in addition, the first protrusion 904 and the second protrusion 905 can reduce the low-pressure area at the blade tip, assist in anti-cavitation, and avoid the efficiency reduction caused by cavitation. The setting of the first protrusion 904 and the second protrusion 905 can reduce energy loss, optimize the flow field and energy conversion, and effectively improve the efficiency of impeller conveying water flow. Multiple notches 14 on the outer wall of the inner cylinder 10 are used in conjunction with the flushing pipe 12 to introduce external water flow to clean the easily clogged gaps on the impeller 9, thus preventing the device from affecting the conveying efficiency due to blockage after long-term use.

[0024] As a technical optimization of the present invention, the blade 903 is a backward-curved arc shape, and the height of the blade 903 gradually decreases from the end near the mounting ring 906 outwards. The shape of the blade 903 changes synchronously with the flow channel space, accurately guiding and controlling the water flow. The backward-curved blade 903 is responsible for determining the water flow outlet angle to ensure efficient energy conversion. The height of the gradually decreasing blade 903, which is the gradually decreasing cross-sectional area of ​​the flow channel, is responsible for managing the velocity and pressure evolution process of the water flow in the flow channel.

[0025] As a technical optimization of this invention, the inlet angle of blade 903 is between 18° and 25°, the outlet angle is between 20° and 30°, and the wrap angle is between 85° and 110°. Blade 903 is also a backward-curved blade. Controlling the inlet angle of blade 903 within a narrow range of 18°-25° has the core advantage of making the relative velocity direction of the water flow entering the flow channel almost coincide with the geometric tangent direction of the leading edge of blade 903. This minimizes the inlet vortex, flow separation, and energy loss caused by the collision between the water flow and blade 903, while also reducing the risk of cavitation in the low-pressure region, laying a low-loss foundation for high-efficiency conversion. Secondly, the backward-curved design of the blade 903's outlet angle of 20°-30° is crucial for efficiency optimization. This angle allows the fluid to obtain a large circumferential velocity component at the outlet, thereby efficiently converting mechanical energy into pressure energy.

[0026] As a technical optimization of the present invention, through grooves are provided on the inner walls of the upper shell 101 and the lower shell 102, corresponding to the notches 14 opened on the inner cylinder 10 inside them. Spray heads 13 are fixedly installed inside each through groove, and the spray heads 13 are connected to the interior of the flushing pipes 12. A high-pressure plunger pump or centrifugal pump with sufficient rated pressure and flow is selected as the power source. Starting from the outlet of the high-pressure pump, a large-diameter main pipeline is connected to collect and stably transport the high-pressure water flow. A primary multi-way distributor is connected to the end of the main pipeline as a main distributor, which evenly distributes the total flow to multiple flushing pipes 12. A primary pressure regulating valve and a flow meter are installed in series on each flushing pipe 12 for macroscopic flow balancing and pressure setting of each main branch. At the end of each flushing pipe 12, a secondary multi-way distributor is connected as a secondary distributor. Each secondary distributor 15 further branches out into several secondary branches, which are ultimately connected to the respective spray heads 13. To achieve precise control, a precision throttle valve or pressure regulator is installed on each secondary branch pipe or at the inlet of each nozzle 13 to independently fine-tune the flow rate and stabilize the pressure of each nozzle 13. This hierarchical control strategy of primary macro-distribution and secondary end-point fine-tuning effectively offsets inherent differences in the pipeline and back pressure fluctuations of the nozzles 13, ensuring that all nozzles 13 can simultaneously spray high-pressure water with uniform and stable pressure and flow rate.

[0027] As a technical optimization of the present invention, the end of the flushing pipe 12 extends to the outside through the upper housing 101 and the lower housing 102, and a connector 15 is fixedly installed at the end of the flushing pipe 12 located outside the upper housing 101 and the lower housing 102; the connector 15 facilitates the connection of the flushing pipe 12 to the primary multi-channel diverter.

[0028] As a technical optimization of the present invention, a balancing structure 25 is fixedly installed on the lower inner wall of the pump casing 1, and the inner cylinder 10 is located above the balancing structure 25; the balancing structure 25 is an existing structure and will not be described in detail here.

[0029] As a technical optimization of the present invention, a base 11 is fixedly installed on the bottom surface of the pump casing 1, and a support column 17 is fixedly installed at the center of the upper surface of the base 11. The lower end of the drive shaft 8 extends through the center of the bottom surface of the inner cylinder 10 to the outside of the inner cylinder 10, and the lower end of the drive shaft 8 is rotatably connected to the upper end face of the support column 17. The lower end of the drive shaft 8 is supported by the support column 17, and the drive shaft 8 is rotatably connected to the inner cylinder 10, and a mechanical seal is used.

[0030] As a technical optimization of the present invention, a sleeve 18 is fixedly installed on the bottom surface of the inner cylinder 10. The sleeve 18 is located outside the support column 17, and the inner wall of the sleeve 18 is fixedly connected to the outer wall of the support column 17. The lower end of the sleeve 18 extends through the bottom surface of the pump housing 1 to the top of the base 11 and is rotatably connected to the upper surface of the base 11. A first gear 19 is fixedly installed on the lower outer wall of the sleeve 18, and a second gear 20 is rotatably installed on the upper surface of the base 11. The second gear 20 is meshed with the first gear 19. By driving the second gear 20 to rotate, the first gear 19 can be driven to rotate, thereby driving the sleeve 18 and the inner cylinder 10 to rotate. The second gear 20 can be driven to control whether the notch 14 on the inner cylinder 10 and the multiple nozzles 13 connected to the flushing pipe 12 are in alignment. The device can be switched between a normal use state in which the notch 14 and the nozzles 13 are misaligned and a cleaning state in which the notch 14 and the nozzles 13 are aligned.

[0031] As a technical optimization of the present invention, the bottom surface of the base 11 is provided with a mounting groove 16, and a connecting shaft 21 is fixedly installed at the center of the bottom surface of the second gear 20. The connecting shaft 21 is rotatably connected to the base 11, and the end of the connecting shaft 21 extends through the base 11 into the mounting groove 16. An adjusting block 22 is fixedly installed at the end of the connecting shaft 21, and an internal hexagonal groove is provided on the bottom surface of the adjusting block 22. When the user inserts a tool into the internal hexagonal groove on the bottom surface of the adjusting block 22, the second gear 20 can be rotated through the connecting shaft 21, and then the first gear 19 can be rotated through the meshing connection between the second gear 20 and the first gear 19.

[0032] As a technical optimization of the present invention, an elastic pin 23 for cooperating with the first gear 19 is fixedly installed on the bottom surface of the mounting groove 16, and a pull block 24 is movably installed on the bottom surface of the elastic pin 23; the elastic pin 23 includes a fixed sleeve 18 fixedly connected to the base 11, a sliding rod slidably connected to the upper end of the fixed sleeve 18, a spring fixedly connected inside the fixed sleeve 18 below the sliding rod, and a pull block 24 slidably connected to the lower end of the fixed sleeve 18; a connecting rod is fixedly connected to the upper surface of the pull block 24, and the pull block 24 is fixedly connected to the sliding rod through the connecting rod. Under normal circumstances, the sliding rod in the elastic pin 23... The end abuts against the bottom surface of the first gear 19, and the sliding rod is housed inside the fixed sleeve 18. When the first gear 19 is rotated under force until the tooth groove is directly above the elastic pin 23, the sliding rod is ejected upward under the action of the spring and stuck inside the tooth groove of the first gear 19, automatically limiting the first gear 19. At this time, the inner cylinder 10 located inside the pump housing 1 can switch to the sealed state for use. By pulling down the pull block 24, the sliding rod is retracted into the fixed sleeve 18 and the adjusting block 22 is rotated at the same time. This drives the first gear 19 to rotate, thereby driving the inner cylinder 10 to rotate and switching the inner cylinder 10 to the cleaning state.

[0033] Working principle of the invention: In use, water is introduced into the pump casing 1 through the inlet pipe 3. Before entering the pump casing 1, the water is filtered by the filter assembly 6. Then, the water flows into the pump casing 1 through the one-way valve 7. After entering the pump casing 1, the water flows through the first storage chamber 103 and then into the inner cylinder 10 located inside the upper casing 101. The two inner cylinders 10 located inside the upper casing 101 and the lower casing 102 are symmetrically arranged. Multiple sets of impellers 9 are mirror-arranged inside the two inner cylinders 10. The drive shaft 8 rotates under the drive of the servo motor 5, which can drive the multiple sets of impellers 9 to rotate simultaneously so that the water flows into the pump casing 1. The water flow is pressurized in the lower casing 102. The second liquid storage chamber 104 at the upper end of the lower casing 102 is correspondingly set with the water outlet pipe 2, and the interior of the second liquid storage chamber 104 is equipped with a double suction impeller 9. This is existing technology and will not be described in detail here. Under the synergistic action of the multi-stage impeller 9 and the double suction impeller, the water flow is output outward through the water outlet pipe 2. After being pressurized by multiple sets of impellers 9 inside the two inner cylinders 10, the water flow output outward through the water outlet pipe 2 has a greater head. The inlet angle of the blade 903 is controlled within a small range of 18°-25°. Its core advantage is that the relative velocity direction of the water flow entering the flow channel is almost coincident with the geometric tangent direction of the leading edge of the blade 903. This minimizes the inlet vortex, flow separation and energy loss caused by the collision between the water flow and the blade 903, while reducing the risk of cavitation in the low-pressure area, laying a low-loss foundation for high-efficiency conversion. Secondly, the outlet angle of the blade 903 adopts a 20°-30° backward-curved design, which is the key to optimizing efficiency. This angle allows the fluid to achieve a larger circumferential velocity component at the outlet, thus efficiently converting mechanical energy into pressure energy. Compared to radial or forward-curved blades 903, the backward-curved blade 903 has a longer and gentler flow channel, resulting in a smoother velocity change within the flow channel and a smaller absolute velocity at the outlet. This means that less kinetic energy is lost when the fluid exiting the impeller 9 is converted into pressure energy in the subsequent volute or guide vanes, thus consistently achieving higher hydraulic efficiency and a more stable performance curve. Finally, the sufficient blade wrap angle of 85°-110° ensures a sufficiently long and continuous contact guide surface for the water flow from the inlet to the outlet. This allows fluid particles to complete a smooth and sufficient energy exchange process along the blade profile 903, avoiding internal vortex losses such as flow separation and secondary flow caused by excessively short blades 903, and ensuring the continuity and integrity of the work done by the impeller 9 on the water flow. The user inserts the tool into the hexagonal recess on the bottom of the adjusting block 22, which drives the second gear 20 to rotate via the connecting shaft 21. This, in turn, drives the first gear 19 to rotate through the meshing connection between the second gear 20 and the first gear 19. The first gear 19 is fixedly connected to the sleeve 18, which is also fixedly connected to the inner cylinder 10. When the sleeve 18 rotates, it drives the inner cylinder 10 to rotate. The two inner cylinders 10 are fixedly connected by two long rods. Therefore, during the above process, the two inner cylinders 10 can be driven to rotate synchronously under the action of an external tool. During normal use, the notch 14 on the inner cylinder 10 is misaligned with the nozzle 13 located inside the upper housing 101 and lower housing 102. The inner walls of the upper housing 101 and the lower housing 102 are both equipped with sealing gaskets at the same horizontal level as the notch 14. The sealing gaskets are made of modified PTFE composite material and are used to fill the gap between the outer wall of the inner cylinder 10 and the inner wall of the lower housing 102 to ensure the sealing of the inner cylinder 10. When multiple impellers 9 need to be cleaned, the servo motor 5 is controlled to rotate to a specified angle and locked under the action of the controller (Kamron). The inner cylinder 10 is driven to rotate so that the notch 14 on the inner cylinder 10 corresponds to the multiple nozzles 13 set in the upper housing 101 and the lower housing 102. External water flow can be introduced through the flushing pipe 12 and the nozzles 13 to backwash and clean the internal structure of the pump housing 1. After prolonged use, the introduced external water flow is pumped into multiple flushing pipes 12 via multiple diverter connectors. The external pump body, multiple flushing pipes 12, and multiple diverter connectors allow the external water flow to be sprayed through the flushing pipes 12 and multiple nozzles 13 connected to them, delivering high-pressure water jets to multiple sets of impellers 9. After the high-pressure water jets are ejected from the nozzles 13, they contact point a on the blades 903. Then, under the action of the blades 903, the water is guided to point b on the adjacent blades 903. Finally, under the guidance of the adjacent blades 903, the water flow is directed to point c (e.g., ...). Figure 5 As shown, under the action of high-speed water flow, the gap between the end of blade 903 and the outer wall of mounting ring 906 is flushed to prevent scale and other deposits from accumulating between blade 903 and mounting ring 906 and causing blockage of the water flow channel. The second protrusion 905 and the first protrusion 904 located on both sides of the end of blade 903 can guide the water flow, so that the high-pressure water flow can flow more concentratedly to the next point, improving the cleaning effect of high-speed water flow on the gap between the end of blade 903 and mounting ring 906. After the high-pressure water flow washes and cleans the multiple sets of impellers 9 inside the pump casing 1, the servo motor 5 is started to reverse and discharge the wastewater from the drain pipe 4 on the inlet pipe 3. The one-way valve 7 located at the port of the inlet pipe 3 can prevent the wastewater from flowing back from the inlet. The wastewater from cleaning inside the pump casing 1 can also be discharged normally through the outlet pipe 2.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A clog-resistant multistage energy-saving centrifugal pump, comprising a pump casing (1), characterized in that: The pump casing (1) includes an upper casing (101) and a lower casing (102). A first liquid storage chamber (103) is fixedly installed at the upper end of the upper casing (101), and a second liquid storage chamber (104) is fixedly installed at the upper end of the lower casing (102). Inner cylinders (10) are rotatably installed in the upper casing (101) and the lower casing (102) respectively below the first liquid storage chamber (103) and the second liquid storage chamber (104). The two inner cylinders (10) are symmetrically arranged. An inlet pipe (3) is fixedly installed on the outer wall of the upper half of the upper casing (101), and an outlet pipe (2) is fixedly installed on the outer wall of the upper half of the lower casing (102). A drain pipe (4) is fixedly installed on the outer wall of the end of the inlet pipe (3) away from the pump casing (1). A filter assembly (6) and a one-way valve (7) are movably installed inside the end of the inlet pipe (3) away from the pump casing (1). A drive shaft (8) is rotatably installed at the center of the pump casing (1). A servo motor (5) is fixedly installed on the upper surface of the pump casing (1). The output end of the servo motor (5) is fixedly connected to the end of the drive shaft (8). Multiple sets of impellers (9) are movably installed on the outer walls of the two inner cylinders (10). The impellers (9) are coaxially set with the drive shaft (8) and are used in conjunction with the inner cavity of the inner cylinder (10). The impeller (9) specifically includes a mounting ring (906), a rear cover plate (901) is fixedly mounted on the bottom surface of the mounting ring (906), a plurality of blades (903) are fixedly mounted on the upper surface of the rear cover plate (901), a front cover plate (902) is fixedly mounted on the upper surface of the plurality of blades (903), a water inlet cavity (907) is opened at the center of the front cover plate (902), the upper end of the mounting ring (906) extends through the interior of the water inlet cavity (907) to the top of the front cover plate (902), and a first protrusion (904) and a second protrusion (905) are fixedly mounted on the outer walls of the two sides of the blade (903) near the mounting ring (906). The outer wall of the inner cylinder (10) is provided with a notch (14) for use with the blade (903), and the upper shell (101) and the lower shell (102) are both fixedly installed with flushing pipes (12) for use with the notch (14).

2. The anti-clogging multi-stage energy-saving centrifugal pump according to claim 1, characterized in that: The blade (903) is a backward-curved arc shape, and the height of the blade (903) gradually decreases from the end closest to the mounting ring (906) outward.

3. The anti-clogging multi-stage energy-saving centrifugal pump according to claim 2, characterized in that: The inlet angle of the blade (903) is between 18° and 25°, the outlet angle of the blade (903) is between 20° and 30°, and the wrap angle of the blade (903) is between 85° and 110°.

4. The anti-clogging multi-stage energy-saving centrifugal pump according to claim 3, characterized in that: The inner walls of the upper shell (101) and the lower shell (102) are provided with through grooves at the corresponding positions of the notches (14) on the inner cylinder (10) provided inside them. Spray nozzles (13) are fixedly installed inside the through grooves, and the spray nozzles (13) are connected to the inside of the flushing pipe (12).

5. The anti-clogging multi-stage energy-saving centrifugal pump according to claim 4, characterized in that: The end of the flushing pipe (12) extends to the outside through the upper housing (101) and the lower housing (102), and a connector (15) is fixedly installed at the end of the flushing pipe (12) located outside the upper housing (101) and the lower housing (102).

6. The anti-clogging multi-stage energy-saving centrifugal pump according to claim 5, characterized in that: A balancing structure (25) is fixedly installed on the lower inner wall of the pump casing (1), and the inner cylinder (10) is located above the balancing structure (25).

7. A clog-resistant multi-stage energy-saving centrifugal pump according to claim 6, characterized in that: The bottom surface of the pump casing (1) is fixedly mounted with a base (11), and a support column (17) is fixedly mounted at the center of the upper surface of the base (11). The lower end of the drive shaft (8) extends through the center of the bottom surface of the inner cylinder (10) to the outside of the inner cylinder (10), and the lower end of the drive shaft (8) is rotatably connected to the upper end surface of the support column (17).

8. The anti-clogging multi-stage energy-saving centrifugal pump according to claim 7, characterized in that: A sleeve (18) is fixedly installed on the bottom surface of the inner cylinder (10). The sleeve (18) is located on the outside of the support column (17), and the inner wall of the sleeve (18) is fixedly connected to the outer wall of the support column (17). The lower end of the sleeve (18) extends through the bottom surface of the pump casing (1) to the top of the base (11) and is rotatably connected to the upper surface of the base (11). A first gear (19) is fixedly installed on the lower outer wall of the sleeve (18), and a second gear (20) is rotatably installed on the upper surface of the base (11). The second gear (20) meshes with the first gear (19).

9. A clog-resistant multi-stage energy-saving centrifugal pump according to claim 8, characterized in that: The base (11) has an installation groove (16) on its bottom surface. A connecting shaft (21) is fixedly installed at the center of the bottom surface of the second gear (20). The connecting shaft (21) is rotatably connected to the base (11) and the end of the connecting shaft (21) extends through the base (11) into the installation groove (16). An adjusting block (22) is fixedly installed at the end of the connecting shaft (21). The bottom surface of the adjusting block (22) has an internal hexagonal groove.

10. A clog-resistant multi-stage energy-saving centrifugal pump according to claim 9, characterized in that: The bottom surface of the mounting groove (16) is fixedly installed with an elastic pin (23) that cooperates with the first gear (19), and a pull block (24) is movably installed on the bottom surface of the elastic pin (23).

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