Submersible pump convenient to overhaul

Abstract

The invention relates to the technical field of water pumps, in particular to a submersible pump convenient to overhaul, which comprises a pump body and a filter screen detachably mounted at the bottom of the pump body, a flow guide cover is arranged at the lower end of the filter screen and used for guiding water flow to form vortex and then pass through the filter screen, and a plurality of cleaning parts capable of automatically cleaning are further arranged on the filter screen. The cleaning device is used for cleaning dirt on the surface of the filter screen. The efficient self-cleaning function of the filter screen of the submersible pump and the filter screen of the sewage pump is achieved through integration of the knife net filter screen, threaded connection, the flow guide cover, the arc-shaped flow guide plate and the automatic cleaning component. The knife net structure actively cuts off sundries, and blockage is reduced; the mounting and dismounting of the filter screen are simplified by a screwing mode, and the maintenance convenience is improved; due to the design of the flow guide cover and the flow guide plate, water flow is converted into vortex, and the washing and cleaning effect on the filter screen is enhanced; and the automatic cleaning part automatically scrapes and brushes the filter screen when the impact force of the water flow is weakened, so that targeted further cleaning is realized.

Description

Technical Field

[0001] The invention relates to the technical field of water pumps, and in particular to a submersible pump which is easy to maintain. Background Art

[0002] In power plants, submersible pumps or sewage pumps are vital equipment. They are not only used for sewage treatment, but also involve the cooling system and circulating water system of power plants. These pumps are in direct contact with water bodies containing impurities, such as seawater or industrial wastewater, and their filters are therefore prone to adsorb and accumulate a large amount of solid particles, fibers, algae and other impurities. The circulating water system of a power plant, as part of the cooling system, is crucial to the safe and economical operation of the unit. Blockage of the circulating water system can cause equipment damage at the least, or even a decrease in the unit output, or even a malignant accident that causes the entire plant to shut down. Therefore, the filters of submersible pumps and sewage pumps in power plants play a core role in maintaining the operating efficiency and safety of the entire power plant.

[0003] The submersible pump and sewage pump filter in the power plant are in direct contact with the impurity-containing water body, which is easy to be blocked, affecting the normal operation of the pump and the efficiency of the circulating water system. Blockage not only reduces the water intake efficiency of the pump, but also may affect the operating parameters of the pump due to the change in the specific gravity of the medium, thereby affecting the operating efficiency of the entire power plant. Since the filter is in underwater operation for a long time, slippery dirt will adhere to the surface, making the disassembly and cleaning work complicated and difficult. The unreasonable structure design of the filter further increases the difficulty and time cost of maintenance, which poses a challenge to ensuring the continuous operation of power plant equipment. The submersible pump filter of some power plants is integrated with the pump body. Once the filter is damaged, the entire pump body needs to be replaced. In addition, the design of some filters does not take into account the need for high water level water intake, which makes it easy for the submersible pump to inhale sediment when working at a low water level, causing machine failure and affecting the stable operation of the power plant.

[0004] For non-automatic self-cleaning basket filters, manual cleaning is required. When cleaning, you need to unscrew the bottom screw plug of the main pipe, drain the fluid, remove the flange cover, take out the filter basket, and rinse it with a soft brush or a high-pressure pump. If conditions permit, you can also add an appropriate amount of detergent or cleaning liquid, so that the cleaning effect is better. This process is not only time-consuming, but also inefficient, increasing the labor intensity of maintenance. For a continuous operation environment such as a power plant, this is a problem that needs to be optimized. Summary of the invention

[0005] In view of the above problems existing in the existing submersible pumps that are easy to repair, the present invention is proposed.

[0006] Therefore, the object of the present invention is to provide a submersible pump that is easy to maintain, which aims to: enable self-cleaning of the filter screen part to reduce the number of maintenance times, and at the same time facilitate staff to disassemble and repair the entire water pump.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a submersible pump that is easy to maintain, comprising a pump body and a filter screen that can be detachably installed at the bottom of the pump body, a flow deflector is arranged at the lower end of the filter screen, which is used to guide the water flow to pass through the filter screen after forming a vortex, and a plurality of automatic cleaning components are also arranged on the filter screen to clean the dirt on the surface of the filter screen.

[0008] As a preferred solution of the submersible pump easy to maintain described in the present invention, the side of the filter screen is provided with a thread which is screwed to the thread at the water inlet at the bottom of the pump body.

[0009] A grid-shaped knife net is arranged inside the filter net, the cross section of the knife net is triangular, and the blade faces the water flow.

[0010] A flow guide cover is detachably mounted on the outer ring end surface of the filter screen. The flow guide cover is arranged in a funnel shape, and the end mounted with the filter screen is an end with a small diameter.

[0011] The inner side wall of the deflector is provided with a plurality of inclined deflector plates, and the deflector plates are arc-shaped.

[0012] The cleaning component comprises a shell body detachably mounted on the back of the filter screen, an elastic member is arranged in the shell body, a rotating member is arranged at the front end of the elastic member, and the elastic member drives the rotating member to rotate and clean.

[0013] The cleaning component is in a mesh corresponding to the midpoint of the radius of the filter, and a plurality of the cleaning components are distributed on the filter in an annular manner with equal spacing.

[0014] The housing comprises a receiving shell, and a plurality of connecting rods are arranged between the filter screen and the receiving shell.

[0015] The elastic member comprises a pressing plate sliding along the inner sides of the plurality of connecting rods, and a spring inside the receiving shell, wherein the spring pushes the pressing plate to move.

[0016] The rotating part includes a rotating ring fixed to the filter screen through a bearing, a scraper is provided on the outer wall of the rotating ring, and steel bristles are provided on the scraper, a twisted rod is provided on the extrusion plate, a screw hole is provided at the center point of the rotating ring, and the twisted rod drives the rotating ring to rotate.

[0017] The beneficial effects of the present invention are as follows: by integrating a knife-net filter, a screw-type connection, a guide cover and an arc-shaped drainage plate, and an automatic cleaning component, an efficient self-cleaning function of a submersible pump and a sewage pump filter is achieved. The knife-net structure actively cuts off debris and reduces blockage; the screw connection simplifies the installation and removal of the filter and improves the convenience of maintenance; the design of the guide cover and the drainage plate converts the water flow into a vortex, which enhances the flushing and cleaning effect on the filter; the automatic cleaning component automatically scrapes the filter when the impact of the water flow weakens, achieving targeted further cleaning. These structural features work together to significantly improve the operating efficiency and reliability of the pump and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 The figure is a schematic diagram of the overall structure of the submersible pump for easy maintenance according to the present invention.

[0020] Figure 2 The filter screen structure of the submersible pump for easy maintenance of the present invention is shown in FIG. Figure 1 .

[0021] Figure 3 The filter screen structure of the submersible pump for easy maintenance of the present invention is shown in FIG. Figure 2 .

[0022] Figure 4 The present invention is a schematic diagram of the front view structure of the filter screen of the submersible pump which is easy to repair.

[0023] Figure 5 for Figure 4 Schematic diagram of the AA section structure.

[0024] In the figure:

[0025] 100. Pump body;

[0026] 200, filter screen; 201, knife screen; 202, outer ring;

[0027] 300, deflector cover; 301, deflector plate;

[0028] 400, cleaning component; 401, shell; 401a, receiving shell; 401b, connecting rod; 402, elastic member; 402a, extrusion plate; 402b, spring; 402c, twisted rod; 403, rotating member; 403a, swivel; 403b, scraper. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0033] Example 1

[0034] Reference Figure 1-Figure 5 , which is the first embodiment of the present invention, provides a submersible pump that is easy to maintain, including a pump body 100 and a filter screen 200 that is detachably installed at the bottom of the pump body 100, and a flow guide cover 300 is arranged at the lower end of the filter screen 200, which is used to guide the water flow to form a vortex and then pass through the filter screen 200. A plurality of automatic cleaning components 400 are also arranged on the filter screen 200, which are used to clean the dirt on the surface of the filter screen 200.

[0035] The filter 200 has a thread on its side, which is screwed to the thread at the water inlet at the bottom of the pump body 100. A mesh-shaped knife net 201 is arranged inside the filter 200, and the cross section of the knife net 201 is triangular, and the blade faces the water flow.

[0036] It should be noted that the design of the triangular blade net 201 enables it to effectively cut larger debris or fibers when water flows through, breaking them into smaller particles, thereby reducing the possibility of clogging. This design is particularly suitable for treating sewage containing a large number of long fibers or solid particles. The cross-sectional design of the triangular blade net 201 helps to improve the efficiency of the water flow. The sharp edges of the triangle can reduce the water flow resistance, allowing the water flow to pass through the filter net 200 more smoothly while maintaining a high flow rate, which is crucial for maintaining the efficient operation of the pump. The design of the blade facing the water flow also helps to achieve the self-cleaning function of the filter net 200. The impact force of the water flow can remove the dirt adhered to the blade net 201 to a certain extent, reduce the need for manual cleaning, and extend the maintenance cycle of the filter net 200. The triangular structure itself has good stability, which makes the blade net 201 not easy to deform or damage when subjected to the impact of water flow and debris, thereby improving the durability and reliability of the filter net 200.

[0037] In summary, the triangular blade net 201 disposed inside the filter net 200, with its blade facing the water flow, can not only effectively handle debris in the water flow and reduce blockage, but also improve water flow efficiency, realize self-cleaning function, and enhance the structural stability and filtering effect of the filter net 200. This design shows its unique advantages and effects in industrial filtering equipment, especially when treating sewage containing a large amount of solid particles or fibers.

[0038] In this embodiment, this technical solution selects a filter 200 with a knife net 201 structure. This knife net 201 filter 200 can actively cut off the debris encountered, effectively reducing the blockage caused by the accumulation of debris. Compared with the traditional passive filter 200, the knife net 201 filter 200 realizes the active treatment of debris through its unique design, thereby significantly improving the filtration efficiency and the operation stability of the pump. In order to facilitate maintenance and replacement, this solution uses a screw connection to connect the filter 200 to the water pump. This connection method not only simplifies the installation and disassembly process, but also improves the reliability and maintenance convenience of the equipment. The screw connection design allows the filter 200 to be quickly disassembled, which is convenient for regular inspection and cleaning, thereby reducing maintenance time and cost.

[0039] In front of the filter 200, the present invention specially designs a guide cover 300, and distributes a plurality of arc-shaped guide plates 301 in a ring inside the guide cover 300. This design increases the flow velocity of the water flow when passing through the guide cover 300, and converts the water flow into an eddy current. This eddy current can not only increase the kinetic energy of the water flow, but also generate a rotating flow on the surface of the filter 200, effectively flushing and cleaning the dirt adhered to the side of the knife net 201, thereby achieving a preliminary self-cleaning effect.

[0040] In order to further improve the cleaning effect, the present solution sets cleaning components 400 behind the filter 200. Under normal working conditions, these cleaning components 400 are impacted by the vortex-like water flow and maintain a contracted state. When the filter 200 is blocked and the impact force of the water flow is weakened, the spring 402b built into the cleaning component 400 will drive the cleaning component 400 to reset, so that the part of the cleaning component 400 located in front of the filter 200 can scrape the filter 200 to achieve further targeted cleaning.

[0041] Through the above design, the technical solution realizes the self-cleaning function of the filter 200. Under the dual effects of the natural flushing of the water flow and the mechanical scraping of the cleaning component 400, the cleaning efficiency of the filter 200 is significantly improved, which greatly reduces the need for manual intervention, reduces maintenance costs, and improves the operating efficiency and reliability of the pump.

[0042] To sum up, this technical solution achieves efficient self-cleaning of the filter 200 through the innovative design of the knife net 201 and the filter net 200, the screw connection method, the coordinated use of the guide cover 300 and the guide plate 301, and the intelligent response mechanism of the cleaning component 400, providing a new solution for the maintenance and operation of submersible pumps and sewage pumps.

[0043] Example 2

[0044] Reference Figure 2-Figure 5 , which is the second embodiment of the present invention, and this embodiment is different from the first embodiment in that: a guide cover 300 is detachably mounted on the end face of the outer ring 202 of the filter 200, and the guide cover 300 is arranged in a funnel shape, and the end mounted with the filter 200 is the end with a small diameter. The inner side wall of the guide cover 300 is provided with a plurality of inclined guide plates 301, and the guide plates 301 are arc-shaped.

[0045] Design of the air deflector 300: the end face card of the outer ring 202 of the filter 200 is removably installed with the air deflector 300. This design can guide the water flow to pass through the filter 200 more effectively. The air deflector 300 is arranged in a funnel shape, and the end where the air deflector 300 and the filter 200 are installed is the end with a small diameter. The funnel shape helps to concentrate the water flow, reduce the turbulence and eddy current of the water flow, thereby improving the filtration efficiency. This overall design helps to concentrate the water flow, thereby accelerating the flow rate of water, while also ensuring a smooth transition of the water flow, reducing the resistance of the water flow when entering the filter 200, and is also convenient for installation and disassembly, maintenance and cleaning.

[0046] Arrangement of the arc-shaped guide plate 301: The inner side wall of the guide cover 300 is provided with a plurality of inclined guide plates 301, and these guide plates 301 are arc-shaped. The design of the arc-shaped guide plate 301 helps to disperse the water flow, reduce the direct impact of the water flow on the filter 200, and extend the service life of the filter 200. At the same time, the arc-shaped design also helps the water flow to form a uniform flow velocity distribution on the surface of the filter 200, thereby improving the filtering effect. The inclined setting of the guide plate 301 enables the water flow to flow along the arc of the guide plate 301 when passing through the guide cover 300. This design helps to reduce the direct impact of the water flow on the filter 200, and at the same time, it is easy for the water flow to form a vortex, providing a rotating self-cleaning effect on the surface of the filter 200. Further, the arc-shaped guide plate 301 is set to a plow shape. The design of the plow-shaped guide plate 301 allows the water flow to be guided and deflected when passing through the guide plate 301, thereby forming a vortex behind the guide plate 301. This design is similar to a spoiler set in a pipe or channel, which can effectively transform the straight-line flow of the fluid into a rotating flow and form a vortex. The multiple guide plates 301 arranged in a ring can change the average tangential velocity of the fluid, increase the fluid pressure gradient and the swirl intensity attenuation rate, which means that by reasonably designing the distribution and shape of the guide plates 301, the vortex intensity and distribution in the flow field can be effectively controlled.

[0047] In summary, the design of the filter 200 achieves effective guidance and distribution of water flow through the structural features of the guide cover 300 and the arc-shaped guide plate 301, improves the filtration efficiency, reduces the impact of the water flow on the filter 200, and also provides the filter 200 with the possibility of self-cleaning. These designs are helpful to improve the performance and service life of the filter 200.

[0048] The remaining structures are the same as those of Example 1.

[0049] Example 3

[0050] Reference Figure 2-Figure 5, which is the third embodiment of the present invention, and this embodiment is different from the second embodiment in that: the cleaning component 400 includes a shell 401 that is detachably mounted on the back of the filter 200, an elastic member 402 is arranged inside the shell 401, and a rotating member 403 is arranged at the front end of the elastic member 402, and the elastic member 402 drives the rotating member 403 to rotate and clean. The shell 401 includes a receiving shell 401a, and a plurality of connecting rods 401b are arranged between the filter 200 and the receiving shell 401a. The elastic member 402 includes an extrusion plate 402a that slides along the inner side of the plurality of connecting rods 401b, and a spring 402b inside the receiving shell 401a, and the spring 402b pushes the extrusion plate 402a to move. The rotating member 403 includes a rotating ring 403a fixed to the filter screen 200 through a bearing, a scraper 403b is provided on the outer wall of the rotating ring 403a, and steel bristles are provided on the scraper 403b, a twisted rod 402c is provided on the extrusion plate 402a, and a screw hole is provided at the center point of the rotating ring 403a, and the twisted rod 402c drives the rotating ring 403a to rotate.

[0051] The deflector 300 is designed to form a vortex, which can effectively impact the extrusion plate 402a on the cleaning component 400 on the back of the filter 200. This design principle can be explained from the perspective of fluid dynamics. First, the several inclined arc guide plates 301 set on the inner wall of the deflector 300 make the water flow form a vortex around the filter 200. The formation of the vortex is crucial to the operation of the cleaning component 400. Since the direct current water flow cannot form an effective impact force to impact the extrusion plate 402a, and the vortex can impact the extrusion plate 402a from the intervals of each connecting rod 401b after passing through other meshes in the area, the impact force of this vortex is the key to realizing the automatic cleaning mechanism. Therefore, the design of the deflector 300 must be able to generate enough vortices so that when the filter 200 is blocked, the action of the extrusion plate 402a and the subsequent cleaning component 400 is triggered by the impact force of the vortex to realize the automatic cleaning of the filter 200. In summary, the flow guide cover 300 can effectively transform the water flow into a vortex through the design of the arc-shaped guide plate 301 on the inner wall thereof, and this vortex not only helps to reduce the direct impact on the filter 200, but also can exert an effective impact force on the extrusion plate 402a on the cleaning component 400 on the back of the filter 200, thereby triggering the entire automatic cleaning mechanism. This design makes full use of the principle of fluid dynamics and improves the efficiency and reliability of the filtration system.

[0052] In this embodiment, the impact force of water flow and the squeezing plate 402a: Under normal working conditions, the impact force generated by the vortex water flow passing through the surrounding filter screen 200 will partially act on the squeezing plate 402a, and this impact force is large enough to cause the squeezing plate 402a to compress the spring 402b at the rear and maintain the compressed state. Due to the compression of the spring 402b by the squeezing plate 402a, the front end of the twisted rod 402c connected thereto is connected to the rotating ring 403a, and the rotating ring 403a remains stationary, which means that the scraper 403b and the steel bristles installed on the outer wall of the rotating ring 403a will not rotate, and therefore will not clean the filter screen 200.

[0053] When some meshes of the filter screen 200 are clogged, the impact force of the vortex water flow on the extrusion plate 402a will decrease. At this time, the spring 402b starts to reset due to the loss of balance of the external impact force, pushing the extrusion plate 402a forward. The forward movement of the extrusion plate 402a drives the twisted rod 402c forward, and then drives the swivel 403a to rotate. The rotation of the swivel 403a causes the scraper 403b on the outer wall and the steel bristles installed on the scraper 403b to start cleaning the filter screen 200, removing the blockage through the scraping action.

[0054] Pump 100 operation and cleaning cycle: The device also has a periodic cleaning function. When the pump 100 is not running, that is, when the water flow stops, the squeezing plate 402a will automatically move to the front end to clean the filter 200. On the contrary, when the pump 100 starts to run, the impact of the water flow causes the squeezing plate 402a to move to the rear end to clean the filter 200 again.

[0055] This design realizes automatic cleaning of the filter screen 200, reduces the need for manual intervention, and improves the efficiency and reliability of the filtration system. Automatic cleaning reduces the performance degradation of the pump and maintenance costs caused by clogging.

[0056] In summary, this automatic cleaning device uses the change of water flow impact force to trigger the cleaning action of the filter 200, and realizes periodic automatic cleaning through mechanical linkage, effectively extending the service life of the filter 200 and maintaining the efficient operation of the pump. This design is particularly useful in industrial filtration systems, especially in applications that require continuous operation and high maintenance costs.

[0057] The cleaning component 400 is in a mesh corresponding to the midpoint of the radius of the filter screen 200 , and a plurality of cleaning components 400 are distributed on the filter screen 200 in an annular manner with equal intervals.

[0058] It should be noted that the cleaning components 400 are distributed on the filter 200 in an annular manner with equal spacing, which can ensure that the entire surface of the filter 200 can be effectively cleaned. This uniformly distributed design allows each cleaning component 400 to cover a specific area of ​​the filter 200, thereby achieving a comprehensive cleaning effect on the entire surface of the filter 200. According to the study of cylindrical flow in fluid mechanics, the annularly distributed cleaning components 400 can make the fluid passing through the filter 200 more uniform in the circumferential direction, which helps to suppress the vibration of the filter 200 and improve the stability and service life of the filter 200. The cleaning component 400 is located at the midpoint of the radius of the filter 200. This position can maximize the use of the kinetic energy of the water flow and remove the dirt on the filter 200 through the impact force of the water flow. At the same time, the annularly distributed cleaning components 400 can work together to form a local rotating flow similar to a vortex, further enhancing the self-cleaning ability of the filter 200. By arranging the cleaning component 400 at the midpoint of the filter 200, it is possible to avoid excessive pressure concentration at the edge or a specific area of ​​the filter 200, which helps to protect the filter 200 from damage and prolong its service life. The annular equidistant distribution of the cleaning components 400 also means that they are easier to access and replace, because they are evenly distributed on the filter 200, and local maintenance and replacement can be performed without disassembling the entire filter 200.

[0059] To sum up, the design of the cleaning components 400 being evenly spaced in a ring within the mesh corresponding to the midpoint of the radius of the filter 200 can not only provide a uniform and effective cleaning effect, but also enhance the self-cleaning ability of the filter 200, reduce local pressure concentration, and facilitate maintenance and replacement, thereby improving the efficiency and reliability of the entire filtration system.

[0060] The remaining structure is the same as that of Example 2.

[0061] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only several embodiments are described in detail in this disclosure, it should be easily understood by the personnel referring to this disclosure that many modifications are possible (for example, the size, scale, structure, shape and ratio of various elements, and parameter values ​​(for example, temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of a plurality of parts or elements, the position of the element can be inverted or otherwise changed, and the property or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method step can be changed or reordered according to alternative embodiments. Therefore, the present invention is not limited to specific embodiments, but extends to a variety of modifications still falling within the scope of the appended claims.

[0062] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A submersible pump that is easy to maintain, characterized in that: The invention comprises a pump body (100) and a filter screen (200) detachably mounted on the bottom of the pump body (100); a flow guide cover (300) is arranged at the lower end of the filter screen (200) for guiding water flow to form a vortex and then pass through the filter screen (200); and a plurality of automatic cleaning components (400) are also arranged on the filter screen (200) for cleaning dirt on the surface of the filter screen (200).

2. The submersible pump for easy maintenance according to claim 1, characterized in that: The side surface of the filter screen (200) is provided with a thread which is threadedly connected with the thread at the water inlet at the bottom of the pump body (100).

3. The submersible pump for easy maintenance according to claim 1, characterized in that: A grid-shaped knife net (201) is arranged inside the filter net (200); the cross section of the knife net (201) is triangular, and the blade faces the water flow.

4. The submersible pump for easy maintenance according to claim 1, characterized in that: A flow guide cover (300) is detachably mounted on the end face of the outer ring (202) of the filter screen (200). The flow guide cover (300) is arranged in a funnel shape, and the end mounted on the filter screen (200) is the end with a smaller diameter.

5. The submersible pump for easy maintenance according to claim 4, characterized in that: The inner side wall of the air guide cover (300) is provided with a plurality of obliquely arranged flow guide plates (301), and the flow guide plates (301) are arc-shaped.

6. The submersible pump for easy maintenance according to claim 1, characterized in that: The cleaning component (400) comprises a shell (401) detachably mounted on the back side of the filter (200), an elastic member (402) being arranged inside the shell (401), a rotating member (403) being arranged at the front end of the elastic member (402), and the elastic member (402) drives the rotating member (403) to rotate and clean.

7. The submersible pump for easy maintenance according to claim 6, characterized in that: The cleaning component (400) is located in a mesh corresponding to the midpoint of the radius of the filter screen (200), and a plurality of the cleaning components (400) are distributed in an annular manner at equal intervals on the filter screen (200).

8. The submersible pump for easy maintenance according to claim 6, characterized in that: The housing (401) comprises a receiving shell (401a), and a plurality of connecting rods (401b) are arranged between the filter screen (200) and the receiving shell (401a).

9. The submersible pump for easy maintenance according to claim 8, characterized in that: The elastic member (402) comprises a pressing plate (402a) sliding along the inner side of a plurality of connecting rods (401b), and a spring (402b) inside the receiving shell (401a), wherein the spring (402b) pushes the pressing plate (402a) to move.

10. The submersible pump for easy maintenance according to claim 9, characterized in that: The rotating member (403) comprises a rotating ring (403a) fixed to the filter screen (200) via a bearing, a scraper (403b) is arranged on the outer wall of the rotating ring (403a), and steel bristles are arranged on the scraper (403b), a twisted rod (402c) is arranged on the extrusion plate (402a), a screw hole is arranged at the center point of the rotating ring (403a), and the twisted rod (402c) drives the rotating ring (403a) to rotate.

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