Energy-saving multi-stage centrifugal pump

Abstract

The invention relates to the technical field of centrifugal pumps, and discloses an energy-saving multi-stage centrifugal pump which comprises a centrifugal pump body and a motor which are fixed to a workbench, a water pumping pipe is arranged on the centrifugal pump body, the energy-saving multi-stage centrifugal pump further comprises a filtering mechanism, the filtering mechanism comprises a box fixedly installed on the workbench, a push plate is arranged in the box, and the push plate is fixedly installed on the workbench. The outer wall of the push plate is attached to the inner wall of the box body in a sliding mode, and the push plate divides the box body into a water cavity and an air compression cavity; the air compression cavity is communicated to the water pumping pipe through a ventilation pipe, a spring is arranged in the air compression cavity, and the two ends of the spring are fixed to the push plate and the box body respectively. A water outlet is formed in the bottom face of the water cavity, a filter plate is arranged on the water outlet, the water outlet is communicated to a water pumping pipe through a water outlet pipe, and the problem that according to existing equipment, a filter screen needs to be manually cleaned, and water needs to be manually injected is solved.

Description

TECHNICAL FIELD

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

[0002] The existing multistage centrifugal pump is mainly composed of a motor, a pump body, a flow guide shell and a multistage impeller installed on the rotating shaft of the motor. When working, the motor drives the multistage impeller to rotate at high speed, and the liquid filled in the first-stage impeller is acted on by the blades of the first-stage impeller, so that the pressure and speed are simultaneously increased, and the liquid is guided to the next-stage impeller through the flow channel of the flow guide shell. In this way, the liquid successively flows through all the impellers and flow guide shells, further increasing the pressure energy of the liquid. When the liquid flows out of the water outlet of the pump body, a vacuum or low pressure is formed at the inlet of the impeller due to the discharge of the liquid, so that the subsequent liquid is continuously pressed into the inlet of the impeller. Thus, the rotating multistage impeller continuously sucks and discharges the liquid. When the multistage impeller is stacked step by step, the multistage centrifugal pump can obtain a larger lift.

[0003] 1. The existing high-efficiency energy-saving centrifugal pump usually has a filter screen arranged at the water inlet to filter impurities. However, after the centrifugal pump is connected with the liquid conveying pipeline, it is inconvenient to clean the filter screen, which will affect the normal conveying of the liquid by the centrifugal pump. 2. The existing high-efficiency energy-saving centrifugal pump needs to be manually filled with water before work, and then the centrifugal pump can be normally started. Manual water injection increases the workload of the workers, wastes manpower and is inconvenient to operate. SUMMARY

[0004] (I) Technical problems solved In view of the shortcomings of the prior art, the present application provides an energy-saving multistage centrifugal pump, which has the advantages of quick cleaning and no need for manual water injection, and solves the problems of manual cleaning of the filter screen and manual water injection of the existing equipment.

[0005] (II) Technical scheme To achieve the above-mentioned purpose, the present application provides the following technical scheme: an energy-saving multistage centrifugal pump, comprising a centrifugal pump body and a motor fixed on a workbench, a water suction pipe is arranged on the centrifugal pump body, Further comprising a filtering mechanism, the filtering mechanism comprises a box body fixedly installed on the workbench, a push plate is arranged in the box body, the outer wall of the push plate is slidingly arranged with the inner wall of the box body, and the push plate divides the box body into a water cavity and an air compression cavity; The air compression cavity is connected to the water suction pipe through an air pipe, springs are arranged in the air compression cavity, and the two ends of the springs are fixed on the push plate and the box body, respectively; A water outlet is formed in the bottom surface of the water cavity, a filter plate is arranged on the water outlet, and the water outlet is connected to the water suction pipe through a water outlet pipe; Wherein, when installing for the first time, the air inside the air chamber is extracted, so that the spring is in a compressed state, when starting the centrifugal pump body, the negative pressure at the water suction pipe will form a pressure difference between the air pipe and the water outlet pipe, so that the cavities on both sides of the push plate are indirectly connected through the air pipe and the water outlet pipe, at this time, the air inside the water cavity can flow into the air chamber, and then the spring returns to the original state, at this time, the push plate pushes the water cavity in the direction of the water cavity, pressurizes the water inside the water cavity, facilitates the water flow from the inside of the water cavity to the water outlet pipe and then to the centrifugal pump body, and the bottom of the push plate can scrape and clean the impurities above the filter plate during the movement in the direction of the water cavity, to prevent the filter plate from being blocked by impurities.

[0006] Preferably, the box is fixedly connected with a secondary filter tank away from the air pipe, the secondary filter tank comprises: The shell is fixedly connected to the box, and the box is provided with an inclined downward flushing opening for communicating the water cavity with the inside of the shell, the shell is communicated with the water outlet pipe through a water guide pipe, and the push plate is provided with a push piece away from the spring, so that when the spring returns to the original position, the push plate moves and drives the push piece to push the impurities in the water cavity into the inside of the shell through the flushing opening.

[0007] Preferably, the top plate of the shell is provided with a water inlet pipe in communication, for supplying water to the inside of the box, the inside of the shell is fixedly provided with a fixed shaft, the fixed shaft is rotatably sleeved with a hemispherical filter shell, the top of the hemispherical filter shell is fixedly connected with a guide vane, the guide vane is used for receiving water flowing from the water inlet pipe and water flowing from the water cavity through the flushing opening, and the water flow impacts the guide vane to drive the hemispherical filter shell to rotate, facilitating secondary filtration.

[0008] Preferably, the push piece is provided with a through hole in the center, and the length and width of the through hole are greater than the length and width of the filter plate respectively.

[0009] Preferably, the guide vane and the hemispherical filter shell are connected to the outside of the fixed shaft through a bearing.

[0010] Preferably, the water inlet pipe, the water outlet pipe and the water suction pipe are communicated through a three-way pipe, and the three-way pipe is provided with a valve, so as to change the communication state of the water suction pipe with the water inlet pipe and the water outlet pipe by controlling the valve.

[0011] Preferably, the shell is provided with a detachable cover plate, so as to facilitate cleaning the inside of the shell, and also facilitate dismounting and cleaning or repairing the hemispherical filter shell.

[0012] Preferably, the water inlet pipe is inclined, and the water flow of the water inlet pipe can be partially diverted to the flushing opening and washed onto the guide vane, so as to drive the hemispherical filter shell to rotate, facilitating uniform filtration of water.

[0013] Preferably, the surface of the hemispherical filter shell is uniformly distributed with filter holes, and the pore size of the filter holes is smaller than the filter pore size of the filter plate, realizing step-by-step fine filtration, and the gap between the plurality of guide vanes is greater than the filter pore size of the filter plate.

[0014] Preferably, the bottom of the air compression cavity is fixedly connected with a drain pipe through a sealing valve, so that water inside the air compression cavity can be conveniently drained.

[0015] (Three) beneficial effects Compared with the prior art, the present application provides an energy-saving multi-stage centrifugal pump, which has the following beneficial effects: 1. The energy-saving multi-stage centrifugal pump, by setting a filter mechanism with a push plate, a spring and a filter plate at the water suction pipe of the centrifugal pump body, utilizing the pressure difference between the water cavity and the negative pressure cavity, forming the pressure difference between the air pipe and the water outlet pipe, making the push plate indirectly connected between the two cavities on both sides, realizing the spring driving the push plate to move to the water cavity. This process not only pressurizes the water inside the water cavity, but also facilitates the smooth flow of water into the centrifugal pump body, and can also remove impurities above the filter plate through the push plate bottom, achieving the effects of preventing the filter plate from being blocked and improving the water flow conveying efficiency, while eliminating the need for additional power to drive the cleaning mechanism, realizing energy saving and filtration and cleaning integration.

[0016] 2. The energy-saving multi-stage centrifugal pump, by setting a secondary filter tank on one side of the box, using the push plate to drive the push piece to push the water cavity impurities into the shell through the flushing port, and through the communication design of the shell and the water outlet pipe, realizing the secondary collection and filtration of the residual impurities after the primary filtration. This structure prolongs the impurity cleaning period, avoids the accumulation of impurities in the water cavity affecting the water flow conveying, and improves the overall filtration effect through partitioned filtration, achieving the effects of ensuring the cleanliness of the centrifugal pump inlet and reducing equipment wear.

[0017] 3. The energy-saving multi-stage centrifugal pump, by setting a water inlet pipe, a fixed shaft and a rotating hemispherical filter shell with guide vanes on the shell of the secondary filter tank, using the water flow of the water inlet pipe and the flushing port to impact the guide vanes to drive the hemispherical filter shell to rotate and realize dynamic secondary filtration. This design enables the water flow to fully contact the hemispherical filter shell, improving the filtration efficiency, while the rotating hemispherical filter shell reduces the risk of impurities adhering and blocking, and cooperates with the water supply function of the water inlet pipe to realize continuous and stable multi-stage filtration, achieving the effects of further improving water quality and ensuring long-term efficient operation of the centrifugal pump. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The structure of the present application is shown in the figure.

[0019] Figure 2 The structure of the present application is shown in the figure.

[0020] Figure 3It is a schematic cross-sectional view of the front view of the structure of the present invention.

[0021] Figure 4 This is a structural diagram of the present invention after removing the motor.

[0022] Figure 5 This is a schematic isometric cross-sectional view of the front view of the structure of the present invention after removing the motor.

[0023] Figure 6 This is an isometric cross-sectional schematic diagram of the upper surface of the structure after removing the motor of the present invention.

[0024] Figure 7 This is a top cross-sectional schematic diagram of the structure of the present invention after removing the motor.

[0025] Figure 8 This is a front view cross-sectional schematic diagram of the structure of the present invention after removing the motor.

[0026] Figure 9 It is a schematic diagram of the structure of the filtering mechanism of the present invention.

[0027] Figure 10 It is a schematic diagram of an isometric cross-section of the filtering mechanism structure of the present invention from the front view.

[0028] Figure 11 It is a schematic diagram of an isometric cross-section of the filter mechanism structure from top view of the present invention.

[0029] Figure 12 It is a schematic front view cross-sectional diagram of the filter mechanism structure of the present invention.

[0030] Figure 13 This is a schematic diagram of the installation structure of the push plate, spring and push piece of the present invention.

[0031] Figure 14 It is an isometric cross-sectional diagram of the push plate, spring and push piece installation structure of the present invention.

[0032] Figure 15 It is a schematic diagram of the hemispherical filter housing structure of the present invention.

[0033] Figure 16 It is a schematic diagram of the structure of the secondary filtration tank of the present invention.

[0034] Figure 17 It is an isometric cross-sectional schematic diagram of the secondary filtration tank structure of the present invention.

[0035] In the figure: 100, centrifugal pump body; 110, water pump pipe; 111, tee pipe; 112, valve; 120, drain outlet; 130, motor; 200, filtering mechanism; 210, box; 211, water inlet pipe; 212, water outlet; 213, water outlet pipe; 214, air pipe; 220, filter plate; 230, spring; 240, push plate; 250, push piece; 260, flushing opening; 300, secondary filter tank; 310, shell; 320, cover plate; 330, fixed shaft; 340, hemispherical filter shell; 350, guide vane; 360, water guide pipe. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0038] In addition, fixed connection refers to the connection of parts or components after being fixed without any relative movement; transmission connection refers to a connection mode in which mechanical movement or torque is transmitted to other working components through a transmission member; sliding connection refers to a connection mode in which two objects are in contact but not fixed, and can slide relative to each other; and rotating connection refers to a connection mode in which two objects are in contact but not fixed, and can rotate relative to each other.

[0039] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0040] Embodiment one: The embodiment provides an energy-saving multi-stage centrifugal pump, which has the following technical features.

[0041] Please refer to Figures 1-17 An energy-saving multi-stage centrifugal pump, comprising a centrifugal pump body 100 fixed on a workbench and a motor 130, the centrifugal pump body 100 is provided with a water suction pipe 110, Further comprising a filtering mechanism 200, the filtering mechanism 200 comprises a box body 210 fixedly installed on the workbench, a push plate 240 is arranged in the box body 210, the outer wall of the push plate 240 is slidingly arranged with the inner wall of the box body 210, and the push plate 240 divides the box body 210 into a water cavity and an air compression cavity; The air compression cavity is communicated to the water suction pipe 110 through an air pipe 214, a spring 230 is arranged in the air compression cavity, and the two ends of the spring 230 are fixedly connected to the push plate 240 and the box body 210 respectively; A water outlet 212 is formed in the bottom surface of the water cavity, a filter plate 220 is arranged on the water outlet 212, and the water outlet 212 is communicated to the water suction pipe 110 through a water outlet pipe 213; The air in the air compression cavity is extracted during the first installation, so that the spring 230 is in a compressed state. When the centrifugal pump body 100 is started, the negative pressure at the water suction pipe 110 will form a pressure difference between the air pipe 214 and the water outlet pipe 213, so that the cavities on both sides of the push plate 240 are indirectly communicated through the air pipe 214 and the water outlet pipe 213. At this time, the air in the water cavity can flow into the air compression cavity, so that the spring 230 returns to the original state. At this time, the push plate 240 pushes in the direction of the water cavity, pressurizes the water in the water cavity, facilitates the water flow from the inside of the water cavity to the water outlet pipe 213 and then to the centrifugal pump body 100, and the bottom of the push plate 240 can scrape and clean the impurities above the filter plate 220 during the movement in the direction of the water cavity, preventing the filter plate 220 from being blocked by impurities.

[0042] It should be noted that a sealing ring made of rubber is fixedly arranged on the outer wall of the push plate 240. The sealing ring is made of wear-resistant and aging-resistant rubber material, and the cross section thereof is rectangular. The sealing ring is tightly attached to the inner wall of the box body 210, so that the air compression cavity and the water cavity are completely isolated, the air circulation is maximally reduced, and the air pressure stability of the air compression cavity and the water cavity is ensured. At the same time, the push plate 240 is made of high-strength alloy material, has good rigidity and corrosion resistance, and can maintain stable performance in long-term reciprocating motion.

[0043] In an optional embodiment, a secondary filtering tank 300 is fixedly connected to the side of the box body 210 away from the air pipe 214. The secondary filtering tank 300 comprises: A shell 310 is fixedly connected to the box body 210, a flushing opening 260 is formed on the box body 210 and inclined downward, the water cavity and the inside of the shell 310 are communicated through the flushing opening 260, the shell 310 is communicated with the water outlet pipe 213 through a water guide pipe 360, and the side of the push plate 240 away from the spring 230 is provided with a push piece 250. When the spring 230 returns to the original position, the push plate 240 is pushed to move and drive the push piece 250 to push the impurities in the water cavity into the inside of the shell 310 through the flushing opening 260.

[0044] In an alternative embodiment, the top plate of the shell 310 is provided with a water inlet pipe 211 in communication for supplying water to the inside of the box 210, and the inside of the shell 310 is fixedly provided with a fixed shaft 330, and the fixed shaft 330 is sleeved with a rotatable hemispherical filter shell 340, and the top of the hemispherical filter shell 340 is fixedly connected with a guide vane 350, and the guide vane 350 is used to receive water flowing from the water inlet pipe 211 and water flowing from the water cavity through the flushing opening 260, and the water flow impacts the guide vane 350 to drive the hemispherical filter shell 340 to rotate, facilitating secondary filtration.

[0045] It should be noted that the water guide pipe 260 is in communication with the outside of the hemispherical filter shell 340, and the filtered water flows through the water guide pipe 260 to the inside of the water outlet pipe 213.

[0046] In an alternative embodiment, the push piece 250 is centrally provided with a through hole, and the length and width of the through hole are greater than the length and width of the filter plate 220, respectively.

[0047] It should be noted that the height of the push piece 250 is lower than the height of the flushing opening 260, so that when the push piece 250 is arranged above the filter plate 220, it does not affect the water flow from the flushing opening 260 into the inside of the shell 310, and the edges of the push piece 250 are rounded to avoid scratching the inner wall of the box 210 during movement.

[0048] In an alternative embodiment, the guide vane 350 and the hemispherical filter shell 340 are connected to the outside of the fixed shaft 330 through a bearing.

[0049] It should be noted that the bearing used by the bearing is a deep groove ball bearing, which has good wear resistance and rotation accuracy, and can ensure that the guide vane 350 and the hemispherical filter shell 340 rotate flexibly under the impact of the water flow, reduce friction resistance, and prolong the service life.

[0050] In an alternative embodiment, the water inlet pipe 211, the water outlet pipe 213 and the water suction pipe 110 can be communicated through a three-way pipe 111, and the three-way pipe 111 is provided with a valve 112, and the communication state of the water suction pipe 110 with the water inlet pipe 211 and the water outlet pipe 213 is changed by controlling the valve 112.

[0051] It should be noted that the valve 112 can be an electromagnetic valve or a manually controlled valve. If an electromagnetic valve is used, it can be linked with the control system of the centrifugal pump body 100 to realize automatic control. If a manually controlled valve is used, it is suitable for some scenes with low requirements for automation. In the initial state of the centrifugal pump body 100, the inside of the negative pressure cavity is in a negative pressure state, and the spring 230 is in a compressed state. At this time, the valve 112 is closed, so that the water inlet pipe 211, the water outlet pipe 213 and the water suction pipe 110 are respectively in a disconnected state. When the centrifugal pump body 100 starts to work, the valve 112 is opened, so that the water inlet pipe 211, the water outlet pipe 213 and the water suction pipe 110 are connected with each other. In this way, the air inside the water cavity and the water outlet pipe 213 can be discharged into the inside of the negative pressure cavity, so that the air pressure inside the negative pressure cavity is restored to the normal pressure. Then, the spring 230 can be restored to the original position, so as to push the push plate 240 to slide to one side of the water cavity. In this way, the water inside the water cavity can be pressurized, so as to facilitate the water inside the water cavity to be discharged into the water outlet pipe 213, and then the inside of the centrifugal pump body 100. Therefore, when the centrifugal pump body 100 works, the water inside the water outlet pipe 213 can be sucked into the body, so as to reduce the step of manual water injection. When the spring 230 is restored to the original position, the push plate 240 is located between the water outlet 212 and the air pipe 214. The water inlet pipe 211 is arranged directly above the water outlet 212. When the spring 230 is restored to the original position, the valve 112 controls the air pipe 214 to be closed. At this time, the centrifugal force generated by the centrifugal pump body 100 can be completely used to suck the flowing water inside the water cavity. Before the centrifugal pump body 100 stops working (which can be several minutes or several seconds), the water inlet pipe 211 is closed, the water inside the water cavity and the water outlet pipe 213 is sucked, and the communication state of the valve 112 to the water outlet pipe 213 is controlled to be closed. The centrifugal force in the centrifugal pump body 100 after this time is used to suck the air inside the negative pressure cavity, so that the spring 230 is in a compressed state, the push plate 240 moves to the side of the negative pressure cavity, and the next time the centrifugal pump body 100 is started, the valve 112 is opened, and the above series of actions are repeated to realize a cycle. The push piece 250 can clean the filter plate 220 twice in each cycle by following the back and forth movement of the push plate 240. Start: first open the water inlet pipe valve to fill the water cavity to the full capacity. At this time, the water flow of the water inlet pipe 211 enters the water cavity through its own pressure until the water cavity is filled. Then, the water inlet pipe is closed to prevent water from continuing to flow in. Then, the three-way pipe valve is opened to establish communication between the pipes. Then, the motor is started to drive the centrifugal pump body 100 to start working. Under the action of the centrifugal pump body 100, the push plate is reset to complete the pressurization and cleaning action. Finally, the water inlet pipe is opened to enter the normal running state to continuously supply water to the water cavity.

[0052] Shutdown: 5 minutes in advance to close the water inlet pipe, stop the water cavity water supply; when the water cavity water level drops to 1 / 3, the water in the water cavity is less, which is convenient for subsequent operation; then close the three-way pipe water outlet pipe passage, cut off the connection between the water outlet pipe 213 and other pipes; then open the air pipe 214 passage, make the air compression cavity and the water pump 110 communicate; then the motor 130 stops, the centrifugal pump body 100 stops working; finally, the air compression cavity exhausts and resets, the spring 230 is compressed, the push plate 240 returns to the initial position, and the next start is prepared.

[0053] In an optional embodiment, a detachable cover plate 320 is arranged on the shell 310, so as to facilitate cleaning the inside of the shell 310, and also facilitate disassembling and cleaning or repairing the hemispherical filter shell 340.

[0054] In an optional embodiment, the water inlet pipe 211 is arranged obliquely, and the water flow of the water inlet pipe 211 can be partially diverted to the flushing port 260 and flushed onto the guide vane 350, thereby being able to drive the hemispherical filter shell 340 to rotate, and facilitating uniform filtration of water.

[0055] In an optional embodiment, the surface of the hemispherical filter shell 340 is uniformly distributed with filter holes, and the filter hole diameter is smaller than the filter hole diameter of the filter plate 220, so as to realize step-by-step fine filtration, and the gap between the plurality of guide vanes 350 is greater than the filter hole diameter of the filter plate 220.

[0056] In an optional embodiment, the bottom of the air compression cavity is fixedly connected with a drain pipe through a sealing valve, thereby being able to conveniently drain the water inside the air compression cavity.

[0057] Working principle: When initially installed, the air in the air chamber of the filter mechanism 200 box 210 is first pumped out, the spring 230 is compressed, and the push plate 240 separates the water chamber from the air chamber. After starting the centrifugal pump body 100, open the valve 112, connect the water suction pipe 110, the air pipe 214 and the water outlet pipe 213. At this time, the air chamber and the water chamber are connected, and the air in the water chamber gradually flows into the air chamber. At this time, the spring 230 returns to its original state and pushes the push plate 240 to move towards the water chamber, which pressurizes the water flow in the water chamber and helps the water flow into the centrifugal pump through the water outlet pipe 213, the water suction pipe 110, and the push plate 240. The bottom of the push plate 240 removes impurities on the filter plate 220 to prevent clogging. At the same time, the push plate 240 moves and drives the push piece 250, pushing the impurities in the water chamber into the shell 310 of the secondary filter tank 300 through the flushing port 260. When the water inlet pipe 211 supplies water, part of the water flow is diverted to the flushing port 260 and impacts the guide vane 350 with the flushed impurities, driving the hemispherical filter shell 340 to rotate around the fixed shaft 330. The filtered water is collected into the water outlet pipe 213 through the water guide pipe 360 and enters the centrifugal pump. The communication state of the water suction pipe 110, the water inlet pipe 211 and the water outlet pipe 213 can be adjusted through the three-way pipe 111 valve 112. The cover plate 320 of the shell 310 facilitates internal cleaning and maintenance of the hemispherical filter shell 340. The drain pipe at the bottom of the air chamber can timely drain the accumulated water in the chamber to ensure stable and efficient operation of the equipment.

[0058] In summary, the energy-saving multi-stage centrifugal pump has a filter mechanism 200 with a push plate 240, a spring 230 and a filter plate 220 arranged at the water suction pipe 110 of the centrifugal pump body 100. The pressure difference between the water chamber and the negative pressure chamber forms a pressure difference between the air pipe 214 and the water outlet pipe 213, which indirectly connects the two sides of the push plate 240, and drives the push plate 240 to move towards the water chamber. This process pressurizes the water in the water chamber, facilitates smooth water flow into the centrifugal pump body 100, and removes impurities above the filter plate 220 through the bottom of the push plate 240 to prevent the filter plate 220 from being clogged and improve water flow delivery efficiency. At the same time, it realizes the integration of energy saving and filter cleaning without additional power driven cleaning mechanism.

[0059] The energy-saving multi-stage centrifugal pump has a secondary filter tank 300 arranged on one side of the box 210. The push plate 240 drives the push piece 250 to push the impurities in the water chamber into the shell 310 through the flushing port 260, and the communication design of the shell 310 and the water outlet pipe 213 realizes the secondary collection and filtration of the residual impurities after the first filtration. This structure prolongs the impurity cleaning period, avoids the accumulation of impurities in the water chamber affecting water flow delivery, and improves the overall filtration effect through zoned filtration to ensure the cleanliness of the centrifugal pump inlet and reduce equipment wear.

[0060] The energy-saving multi-stage centrifugal pump is characterized in that the water inlet pipe 211, the fixed shaft 330 and the rotating hemispherical filter shell 340 with guide vanes 350 are arranged on the shell 310 of the secondary filter tank 300, the water flow of the water inlet pipe 211 and the flushing opening 260 impacts the guide vanes 350 to drive the hemispherical filter shell 340 to rotate to realize dynamic secondary filtration, the water flow and the hemispherical filter shell 340 are fully contacted to improve the filtration efficiency, the rotating hemispherical filter shell 340 reduces the risk of impurity adhesion and blockage, the water supply function of the water inlet pipe 211 is matched to realize continuous and stable multi-stage filtration, the water quality is further improved, and the centrifugal pump is ensured to be long-term and high-efficiency.

[0061] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... " does not, without more limitations, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0062] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, alternatives, and variations can be made in the embodiments without departing from the spirit and scope of the present application as defined by the appended claims and their equivalents.

Claims

1. An energy-saving multi-stage centrifugal pump, comprising a centrifugal pump body (100) and a motor (130) fixed on a workbench, wherein a water pumping pipe (110) is provided on the centrifugal pump body (100), and characterized in that: The filter mechanism (200) further comprises a box (210) fixedly mounted on a workbench, a push plate (240) being provided in the box (210), an outer wall of the push plate (240) being slidably arranged in contact with an inner wall of the box (210), and the push plate (240) dividing the box (210) into a water chamber and an air pressure chamber; The air pressure chamber is connected to the water pumping pipe (110) through the vent pipe (214), a spring (230) is provided in the air pressure chamber, and two ends of the spring (230) are respectively fixed to the push plate (240) and the box body (210); A water outlet (212) is provided on the bottom surface of the water cavity, a filter plate (220) is provided on the water outlet (212), and the water outlet (212) is connected to the water pumping pipe (110) through a water outlet pipe (213); By changing the position of the push plate (240), it is convenient to push the water flow from the inside of the water cavity into the water outlet pipe (213) and then into the centrifugal pump body (100), and the push plate (240) can scrape and clean impurities above the filter plate (220) to prevent the filter plate (220) from being blocked by impurities.

2. An energy-saving multistage centrifugal pump according to claim 1, characterized in that: A secondary filter tank (300) is fixedly connected to a side of the box (210) away from the ventilation pipe (214), and the secondary filter tank (300) comprises: The housing (310) is fixedly connected to the box (210). The box (210) is provided with a flushing port (260) inclined downward, and the water cavity and the interior of the housing (310) are connected through the flushing port (260). The housing (310) is connected to the water outlet pipe (213) through the water guide pipe (360). A push piece (250) is provided on the side of the push plate (240) away from the spring (230). When the spring (230) returns to its original position, the push plate (240) is pushed to move, thereby driving the push piece (250) to push impurities in the water cavity into the interior of the housing (310) through the flushing port (260).

3. An energy-saving multistage centrifugal pump according to claim 2, characterized in that: A water inlet pipe (211) is provided on the top plate of the housing (310) for supplying water to the interior of the box (210). A fixed shaft (330) is fixedly provided inside the housing (310). A rotatable hemispherical filter housing (340) is sleeved on the fixed shaft (330). A guide vane (350) is fixedly connected to the top of the hemispherical filter housing (340). The guide vane (350) is used to receive water flowing in from the water inlet pipe (211) and water flowing in from the water cavity through the flushing port (260). The water flow impacts the guide vane (350), thereby driving the hemispherical filter housing (340) to rotate, thereby facilitating secondary filtration.

4. The energy-saving multistage centrifugal pump according to claim 2, characterized in that: A through hole is provided in the center of the push plate (250), and the length and width of the through hole are respectively greater than the length and width of the filter plate (220).

5. The energy-saving multi-stage centrifugal pump according to claim 3, characterized in that: The guide vane (350) and the hemispherical filter housing (340) are connected to the outside of the fixed shaft (330) via bearings.

6. The energy-saving multi-stage centrifugal pump according to claim 3, characterized in that: The water inlet pipe (211), the water outlet pipe (213) and the water extraction pipe (110) can be connected via a three-way pipe (111), and a valve (112) is provided on the three-way pipe (111). By controlling the valve (112), the connection state between the water extraction pipe (110), the water inlet pipe (211) and the water outlet pipe (213) can be changed.

7. The energy-saving multi-stage centrifugal pump according to claim 3, characterized in that: The housing (310) is provided with a detachable cover plate (320), thereby facilitating cleaning of the interior of the housing (310) and also facilitating disassembly, cleaning or maintenance of the hemispherical filter housing (340).

8. The energy-saving multi-stage centrifugal pump according to claim 3, characterized in that: The water inlet pipe (211) is arranged at an angle, and the water flow of the water inlet pipe (211) can be partially diverted to the flushing port (260) and flushed onto the guide blades (350), thereby driving the hemispherical filter housing (340) to rotate, thereby facilitating uniform filtration of water.

9. The energy-saving multi-stage centrifugal pump according to claim 3, characterized in that: Filter holes are evenly distributed on the surface of the hemispherical filter housing (340), and the pore size of the filter holes is smaller than the pore size of the filter plate (220), thereby achieving step-by-step fine filtration, and the gaps between the plurality of guide blades (350) are larger than the pore size of the filter plate (220).

10. The energy-saving multi-stage centrifugal pump according to claim 1, characterized in that: The bottom of the air pressure chamber can be fixedly connected to a drain pipe via a sealing valve, thereby conveniently draining the water inside the air pressure chamber.

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