Anti-blocking submerged pump

Abstract

The invention relates to the technical field of anti-blocking submerged pump equipment, in particular to an anti-blocking submerged pump which comprises a connecting assembly, a pump body motor, a liquid pump assembly, a liquid discharging pipe, a filtering assembly and a connecting shaft, the pump body motor is fixedly connected with one end of the connecting assembly, the liquid pump assembly is provided with a pump body flow channel, a liquid inlet and a liquid outlet, and the liquid discharging pipe is connected with the connecting shaft. An impeller is installed in the pump body flow channel, the liquid discharging pipe is fixed to the liquid outlet and provided with a liquid inlet end, a liquid discharging end and a back flushing end, the filtering assembly is installed in the liquid inlet and comprises a filtering part and a sliding part, and a sewage discharging groove penetrating through the filtering assembly is formed in the sliding part. Through the combined design of the filtering assembly and the liquid outlet, automatic cleaning is achieved, the use energy consumption and the use cost of the submerged pump are reduced, energy consumption increase caused by blockage of the submerged pump is avoided, meanwhile, additional power equipment is not needed in the back flushing process, opening and closing of a sewage discharging groove of the filtering assembly can be completed only through fluid pressure, and the cost is reduced. And the maintenance energy consumption of the submerged pump is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-blocking submersible pump equipment, and in particular to an anti-blocking submersible pump. Background Art

[0002] As a kind of equipment widely used in industrial sewage discharge, chemical transportation, sewage treatment and other fields, the stability and anti-blocking performance of submersible pumps directly affect the operating efficiency and energy consumption cost of the system.

[0003] Currently, submersible pumps typically use fixed filters or cartridges to pre-treat the medium to intercept large impurities. However, because the filter's aperture is fixed and cannot be dynamically adjusted to the medium's characteristics, it is easily clogged by fine particles or fibers, resulting in increased pressure at the pump's inlet and reduced flow.

[0004] When a submersible pump is conveying fluids containing solid particles, fibrous impurities or viscous media, the pump flow channel is easily blocked due to the accumulation of impurities. Key parts such as the impeller, liquid inlet or discharge pipe are stuck or wrapped by impurities, which not only reduces the efficiency of the pump and increases energy consumption, but in severe cases may even cause damage to the pump body or shutdown, affecting production continuity.

[0005] To address the aforementioned technical issues, a patent application filed on October 17, 2017, with application number CN201721354772.0, discloses an intelligent long-axis submersible pump. This patent incorporates a backwash pipe connected to a filter screen to backwash the pump with a cleaning fluid. While this method of operation is feasible, the cleaning fluid must be discharged from the pump flow channel inlet during the backwash process, requiring a high pumping pressure and increasing the submersible pump's cleaning energy consumption. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide an anti-blocking submersible pump to solve the problem of needing additional water supply equipment and pipelines, which increases the operating cost of the pump equipment.

[0007] Based on the above-mentioned objectives, the present invention provides an anti-blocking submersible pump, including a connecting assembly; a pump body motor, which is fixedly connected to one end of the connecting assembly; a liquid pump assembly, which is fixedly connected to the other end of the connecting assembly, and has a pump body flow channel, which runs through the liquid pump assembly and is provided with a liquid inlet and a liquid outlet, and an impeller is rotatably installed in the pump body flow channel; a discharge pipe, which is fixed at the liquid outlet, and has a liquid inlet end, a discharge end and a backwash end; a filter assembly, which is slidably installed in the liquid inlet, and the filter assembly includes a filter part and a sliding part, and a sewage trough that runs through the filter assembly is provided on the sliding part; a connecting shaft, which is rotatably installed in the connecting assembly, one end of which is drive-connected to the power shaft of the pump body motor, and the other end of which is drive-connected to the impeller; the filter assembly has a first state and a second state: when the filter assembly is in the first state, the sewage trough is sealed and inserted into the liquid inlet; when the filter assembly is in the second state, the sewage trough is located outside the liquid inlet and communicates with the external space.

[0008] In an optional example, the liquid pump assembly includes a liquid pump housing fixedly connected to the connecting assembly, the pump body flow channel is opened in the liquid pump housing, and a rotating ring is installed in the liquid inlet by a rotating connection with the axial direction of the liquid inlet as the center line, the sliding part is connected to the rotating ring by a sliding manner, and can move along the rotation center direction of the rotating ring, and a plurality of crushing teeth are provided at one end of the filter assembly facing the liquid inlet, and a spring is mounted on the outer wall of the filter part, one end of the spring is in conflict with the filter part, and the other end of the spring is in conflict with the rotating ring, and the elastic force of the spring pushes the filter part to move toward the direction close to the connecting assembly.

[0009] In an optional example, the filter portion includes filter element 1, the sliding portion includes filter element 2, the filter element 1 is fixedly connected to the filter element 2, the filter element 1 is arranged at the end facing away from the liquid inlet, a filter cavity is provided in the filter element 1, a plurality of filter holes are provided on the outer wall of the filter element 1, a through flow groove is provided in the filter element 2 along the sliding direction of the filter element, the sewage trough is provided on the outer surface of the filter element 2 and is connected to the flow groove, and the crushing teeth are provided at the end of the filter element 2 facing the liquid inlet.

[0010] In an optional example, a sliding groove that passes through the rotating ring is provided on the inner wall of the rotating ring, and a sliding bar matching the sliding groove is provided on the outer wall of the filter element 2. The sliding bar is slidably inserted into the sliding groove. A limiting flange is provided at one end of the filter element 2 facing toward one direction of the filter element, and a limiting ring is fixed at one end of the filter element 2 facing away from the filter element. The limiting flange, the limiting ring and the two ends of the sliding bar are in conflict.

[0011] In an optional example, a conical guide block is provided in the second filter element, and the crushing teeth are evenly arranged with the conical guide block as the center.

[0012] In an optional example, the conical guide block is provided with a first conical portion at one end facing a direction closer to the filter element, and is provided with a second conical portion at one end facing a direction away from the filter element.

[0013] In an optional example, a plurality of vortex guide plates are provided on the inner wall of the filter chamber, and a diverter is fixed at the bottom center of the filter chamber.

[0014] In an optional example, the liquid pump housing includes a liquid pump housing, a guide cavity is provided at the upper end of the liquid pump housing, a plug-in groove is provided at the bottom of the guide cavity, a pump body bearing is plugged and fixed in the plug-in groove, the impeller is plugged and fixed to the inner ring of the pump body bearing, a housing hole penetrating the liquid pump housing is provided at the bottom of the plug-in groove, an upper sealing ring fixedly connected to the connection assembly is fixed at the upper end of the liquid pump housing, the end of the connecting shaft passes through the upper sealing ring and is drive-connected to the impeller, a lower connecting seat is fixed at the lower end of the liquid pump housing, a lower channel penetrating the lower connecting seat is provided in the lower connecting seat, and the rotating ring is installed in the lower channel in a rotating manner, In an optional example, the lower connecting seat includes a lower seat body and a bottom sealing ring. A rotating groove is opened at the lower end of the lower seat body, and the rotating ring is rotatably inserted into the rotating groove. The bottom sealing ring is fixed to the lower end of the lower seat body and conflicts with the lower end of the rotating ring.

[0015] In an optional example, a limiting convex ring is provided in the lower channel, a plurality of limiting tooth grooves are provided at the lower end of the limiting convex ring, and a limiting convex tooth matching the limiting tooth groove is provided at one end of the filter element 2 facing the limiting convex ring.

[0016] The beneficial effect of the present invention is that through the combined design of the filter assembly and the liquid outlet, automatic cleaning is achieved, the energy consumption and usage cost of the submersible pump are reduced, and the energy consumption increase caused by blockage of the submersible pump is avoided. At the same time, the backwash process does not require additional power equipment, and the opening and closing of the filter assembly drain tank can be completed only by using fluid pressure, which reduces the maintenance energy consumption of the submersible pump. The filter assembly adopts a modular structure design, which is convenient for the installation and disassembly of the filter assembly, thereby improving equipment maintenance efficiency and manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of the three-dimensional structure of an embodiment of the present invention; Figure 2 is a cross-sectional view of an embodiment of the present invention; Figure 3 This is a schematic diagram of a first state of a filter assembly according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the second state of the filter assembly in an embodiment of the present invention; Figure 5 A schematic diagram of the connection relationship of the filter components in an embodiment of the present invention; Figure 6 This is a schematic diagram of the exploded structure of the filter assembly in an embodiment of the present invention; Figure 7 Schematic diagram of the explosion structure of the filter element 2 in the embodiment of the present invention Figure 1 ; Figure 8 Schematic diagram of the explosion structure of the filter element 2 in the embodiment of the present invention Figure 2 ; Figure 9 Schematic diagram of the three-dimensional structure of the rotating ring in an embodiment of the present invention; Figure 10 This is a schematic diagram of the three-dimensional structure of the filter element 2 in an embodiment of the present invention; Figure 11 Schematic diagram of the three-dimensional structure of the filter element 1 in an embodiment of the present invention.

[0019] The following are marked in the figure: 1. Connecting assembly; 11. Connecting shaft; 2. Pump motor; 3. Liquid pump assembly; 301. Pump flow channel; 302. Liquid inlet; 303. Liquid outlet; 31. Impeller; 32. Filter assembly; 3201. Filter unit; 3202. Sliding unit; 3203. Drain chute; 321. Crushing teeth; 322. Filter element 1; 3221. Filter chamber; 3222. Filter hole; 3223. Vortex guide plate; 3224. Diverter; 323. Filter element 2; 3231. Flow slot; 3232. Sliding bar; 3233. Limiting flange; 3234. Limiting convex teeth; 324. Limiting ring; 325, conical guide block; 3251, conical portion 1; 3252, conical portion 2; 33, liquid pump housing; 331, liquid pump housing; 332, diversion chamber; 333, plug-in slot; 334, housing hole; 335, upper sealing ring; 336, lower connecting seat; 3361, lower channel; 33611, limiting protruding ring; 33612, limiting tooth groove; 3362, lower seat; 33621, rotating slot; 3363, bottom sealing ring; 34, rotating ring; 341, sliding slot; 35, spring; 36, pump bearing; 4, discharge pipe; 41, liquid inlet end; 42, liquid discharge end; 43, backflush end; DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0021] It should be noted that, unless otherwise defined, the technical or scientific terms used in the present invention should have the usual meanings understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0022] In one embodiment, see Figures 1 to 4 As shown, the present invention provides an anti-blocking submersible pump, which includes a connection assembly 1, a pump motor 2, a liquid pump assembly 3, a discharge pipe 4, a filter component 32 and a connecting shaft 11.

[0023] The pump motor 2 is fixedly connected to one end of the connection assembly 1 by means of bolt connection.

[0024] The liquid pump assembly 3 is fixedly connected to the other end of the connection assembly 1 by means of a bolt connection, and has a pump body flow channel 301, which runs through the liquid pump assembly 3 and is provided with a liquid inlet 302 and a liquid outlet 303. An impeller 31 is installed in the pump body flow channel 301 by means of a bearing connection.

[0025] The liquid discharge pipe 4 is fixed at the liquid outlet 303 and has a liquid inlet end 41, a liquid discharge end 42 and a backwash end 43. The backwash end 43 is connected to an external liquid supply device, which is used to provide cleaning liquid for backwashing.

[0026] The filter assembly 32 is installed in the liquid inlet 302 by sliding. The filter assembly 32 includes a filter portion 3201 and a sliding portion 3202 . The sliding portion 3202 is provided with a sewage drain trough 3203 that penetrates the filter assembly 32 .

[0027] The connecting shaft 11 is installed in the connecting assembly 1 by means of a bearing connection, one end of which is drive-connected to the power shaft of the pump motor 2 by means of a key connection, and the other end of which is drive-connected to the impeller 31 by means of a key connection.

[0028] The filter element 32 has a first state and a second state: When the filter assembly 32 is in the first state, the drain trough 3203 is sealed and inserted into the liquid inlet 302, the pump body motor 2 is working, the power shaft drives the connecting shaft 11 to rotate, and the connecting shaft 11 drives the impeller 31 to rotate. After the fluid is filtered by the filter assembly 32, it flows into the pump body flow channel 301 from the liquid inlet 302, and then flows into the drain pipe 4 through the liquid outlet 303, and is discharged from the discharge end 42, effectively preventing large particles of impurities from directly entering the pump body.

[0029] When the filter assembly 32 is in the second state, the cleaning liquid flows into the drain pipe 4 through the backflushing end 43, then flows into the pump body flow channel 301 through the liquid outlet 303, and is finally discharged from the liquid inlet 302. The backflushing pressure of the fluid pushes the filter assembly 32 to slide, causing the sewage trough 3203 to slide out of the liquid inlet 302 and connect with the external space, realizing the reverse flushing of the submersible pump, effectively preventing the pump body from being blocked or the impeller 31 from being stuck due to the accumulation of impurities, ensuring the continuous and stable operation of the equipment, and reducing the frequency of shutdown maintenance due to blockage.

[0030] Specifically, this example achieves automatic cleaning through the combined design of the filter component 32 and the liquid outlet 303, reduces the energy consumption and usage cost of the submersible pump, and avoids the increase in energy consumption caused by blockage of the submersible pump. At the same time, the backwash process does not require additional power equipment, and the opening and closing of the filter component 32 drain trough 3203 can be completed only by using fluid pressure, thereby reducing the maintenance energy consumption of the submersible pump. In addition, the filter component 32 adopts a modular structure design, which facilitates the installation and disassembly of the filter component 32, reducing the maintenance efficiency and manufacturing cost of the submersible pump.

[0031] In an alternative example, see Figures 1 to 5 As shown, the liquid pump assembly 3 includes a liquid pump housing 33 fixedly connected to the connection assembly 1 by means of bolts, the pump body flow channel 301 is opened in the liquid pump housing 33, and a rotating ring 34 is installed in the liquid inlet 302 by means of a rotating connection with the axial direction of the liquid inlet 302 as the center line. The sliding portion 3202 is connected to the rotating ring 34 by a sliding manner and can move along the rotation center direction of the rotating ring 34. A plurality of crushing teeth 321 are provided at one end of the filter component 32 facing the liquid inlet 302, and a spring 35 is mounted on the outer wall of the filter portion 3201. The upper end of the spring 35 conflicts with the filter portion 3201, and the lower end of the spring 35 conflicts with the rotating ring 34. The elastic force of the spring 35 pushes the filter portion 3201 to move toward the direction close to the connection assembly 1.

[0032] Specifically, in this example, when the fluid flows forward and backward, the crushing teeth 321 can crush the incoming large particles of impurities (such as fibers, rubber blocks) into small particles, avoiding direct clogging of the filter part 3201, significantly reducing the risk of clogging, and using the elastic force of the spring 35 to push the filter part 3201 close to the liquid inlet 302, ensuring the sealing of the liquid inlet 302 when the pump body motor 2 is working in the forward direction to prevent leakage. At the same time, the compression stroke of the spring 35 has a certain moving distance, which ensures the state switching of the filter component 32.

[0033] In an alternative example, see Figures 1 to 7 As shown, the filter portion 3201 includes a first filter element 322, and the sliding portion 3202 includes a second filter element 323. The first filter element 322 is fixedly connected to the second filter element 323 by bolts. The first filter element 322 is located at the end facing away from the liquid inlet 302. A filter cavity 3221 is provided within the first filter element 322. A plurality of filter holes 3222 are formed on the outer wall of the first filter element 322. A flow groove 3231 is formed through the second filter element 323 along the sliding direction of the filter element. The sewage trough 3203 is provided on the outer surface of the second filter element 323 and is connected to the flow groove 3231. The crushing teeth 321 are provided at the end of the second filter element 323 facing the liquid inlet 302. The guide cavity 332, the housing hole 334, the flow groove 3231, and the filter cavity 3221 together form the pump body flow channel 301.

[0034] Specifically, in this example, the filter part 3201 adopts a split design, which facilitates the disassembly and cleaning of the filter part 3201, reducing the maintenance cost of the filter assembly 32. At the same time, the combined structure of filter element 1 322 and filter element 2 323 does not increase the overall size of the pump body, and can be adapted to the installation structure of the existing submersible pump, reducing the cost of equipment upgrades.

[0035] In an alternative example, see Figures 1 to 9 As shown, a sliding groove 341 is provided on the inner wall of the rotating ring 34, which passes through the rotating ring 34, and a sliding bar 3232 matching the sliding groove 341 is provided on the outer wall of the filter element 2 323. The sliding bar 3232 is slidably inserted into the sliding groove 341. A limiting flange 3233 is provided on the end of the filter element 2 323 facing the direction close to the filter element 1 322. The limiting ring 324 is fixed to the end of the filter element 2 323 facing away from the filter element 1 322 by means of bolt connection. The limiting flange 3233 and the limiting ring 324 conflict with both ends of the sliding bar 3232.

[0036] Specifically, this example adopts a modular structural design, which simplifies the overall assembly process of the filter component 32 and reduces the manufacturing difficulty and maintenance cost of the filter component 32. At the same time, the limiting flange 3233 and the limiting ring 324 at both ends of the filter element 323 form a mechanical stop with the sliding bar 3232, accurately limiting the sliding stroke of the filter component 32, ensuring that the drain trough 3203 is reliably sealed in the liquid inlet 302 during operation, and the drain trough 3203 slides accurately to the outside of the liquid inlet 302, avoiding structural failure or sealing failure due to excessive sliding.

[0037] In an alternative example, see Figures 1 to 9 As shown, a conical guide block 325 is provided in the second filter element 323 , and the crushing teeth 321 are evenly arranged with the conical guide block 325 as the center.

[0038] Specifically, this example can effectively adjust the material flow field distribution through the conical guide block 325, so that the fluid flows along the preset path to the crushing tooth 321 area, reducing turbulence and stagnation areas, thereby reducing the risk of fluid blockage.

[0039] In an alternative example, see Figures 1 to 10 As shown, the conical guide block 325 is provided with a conical portion 1 3251 at one end thereof facing toward the filter element 1 322 , and a conical portion 2 3252 at one end thereof facing away from the filter element 1 322 .

[0040] Specifically, this example uses the conical portion 1 3251 and the conical portion 2 3252 set at both ends of the conical guide block 325 to guide the fluid when it flows forward and reverse in the pump body flow channel 301, reducing turbulence and stagnation areas, and reducing the risk of fluid blockage.

[0041] In an alternative example, see Figures 1 to 11 As shown, a plurality of vortex guide plates 3223 are provided on the inner wall of the filter cavity 3221 , and a diverter 3224 is fixed at the bottom center of the filter cavity 3221 .

[0042] Specifically, in this example, when the fluid passes through the filter chamber 3221, the fluid is first guided to the direction of the vortex guide plate 3223 by the diverter 3224, and then the guidance of the vortex guide plate 3223 is used to make the filter assembly 32 rotate, further disturbing the fluid and reducing the risk of fluid blockage.

[0043] In an alternative example, see Figures 1 to 11 As shown, the liquid pump housing 33 includes a liquid pump housing 331, a guide chamber 332 is provided at the upper end of the liquid pump housing 331, and a plug-in groove 333 is provided at the bottom of the guide chamber 332. A pump body bearing 36 is inserted and fixed in the plug-in groove 333, and the impeller 31 is plugged and fixed to the inner ring of the pump body bearing 36. A housing hole 334 is provided at the bottom of the plug-in groove 333 and penetrates the liquid pump housing 331. An upper sealing ring 335 fixedly connected to the connection assembly 1 is fixed at the upper end of the liquid pump housing 331, and the end of the connecting shaft 11 passes through the upper sealing ring 335 and is drivingly connected to the impeller 31. The lower end of the liquid pump housing 331 is fixed with a lower connecting seat 336 by bolt connection. A lower channel 3361 penetrating the lower connecting seat 336 is provided in the lower connecting seat 336, and the rotating ring 34 is installed in the lower channel 3361 by rotation.

[0044] Specifically, this example simplifies the installation process of the impeller 31 and the bearing through the plug-in fixing design of the plug-in slot 333 and the pump body bearing 36, eliminates the need for complex positioning or fastening steps, reduces assembly difficulty and cost, and facilitates disassembly and maintenance.

[0045] In an alternative example, see Figures 1 to 11 As shown, the lower connecting seat 336 includes a lower seat body 3362 and a bottom sealing ring 3363 fixed to each other by bolt connection. A rotating groove 33621 is opened at the lower end of the lower seat body 3362, and the rotating ring 34 is rotatably inserted into the rotating groove 33621. The bottom sealing ring 3363 is fixed to the lower end of the lower seat body 3362 and conflicts with the lower end of the rotating ring 34.

[0046] Specifically, this example facilitates the disassembly and assembly of the rotating ring 34 by opening the rotating groove 33621 at the lower end of the lower seat body 3362, thereby reducing the assembly difficulty and maintenance cost of the liquid pump housing 33. At the same time, the lower connecting seat 336 adopts a detachable design to facilitate overall disassembly and assembly.

[0047] In an alternative example, see Figures 1 to 11 As shown, a limiting protrusion 33611 is disposed within the lower channel 3361. The lower end of the limiting protrusion 33611 is provided with a plurality of limiting teeth and grooves 33612. The end of the second filter element 323 facing the limiting protrusion 33611 is provided with limiting teeth 3234 that match the limiting teeth and grooves 33612. When the filter assembly 32 is in the first state, the limiting teeth 3234 are inserted into the limiting teeth and grooves 33612, thereby limiting the rotation of the limiting protrusion 33611.

[0048] Specifically, this example ensures that the filter assembly 32 is precisely fixed in a predetermined position in the first state by plugging and fitting the limiting protrusion 3234 with the limiting tooth groove 33612, preventing rotation or displacement caused by fluid impact or mechanical vibration, thereby maintaining filtering accuracy and system stability.

[0049] In general, this example achieves automatic cleaning through the combined design of the filter component 32 and the liquid outlet 303, reduces the energy consumption and usage cost of the submersible pump, and avoids the increase in energy consumption caused by blockage of the submersible pump. At the same time, the backwash process does not require additional power equipment, and the opening and closing of the filter component 32 drain trough 3203 can be completed only by using fluid pressure, which reduces the maintenance energy consumption of the submersible pump. In addition, the filter structure 32 does not increase the overall size of the submersible pump, and can be adapted to the existing submersible pump installation structure, reducing equipment upgrade costs.

[0050] It should be understood by those skilled in the art that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0051] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An anti-blocking submersible pump, characterized in that: include: Connecting assembly (1); A pump motor (2) fixedly connected to one end of the connection assembly (1); a liquid pump assembly (3) fixedly connected to the other end of the connection assembly (1), having a pump body flow channel (301) that passes through the liquid pump assembly (3) and is provided with a liquid inlet (302) and a liquid outlet (303); an impeller (31) is rotatably mounted in the pump body flow channel (301); A liquid discharge pipe (4), which is fixed at the liquid outlet (303) and has a liquid inlet end (41), a liquid discharge end (42) and a backwash end (43); A filter assembly (32) is installed in the liquid inlet (302) in a sliding manner, the filter assembly (32) comprising a filter portion (3201) and a sliding portion (3202), the sliding portion (3202) being provided with a sewage drain trough (3203) penetrating the filter assembly (32); A connecting shaft (11) is rotatably mounted in the connecting assembly (1), one end of which is drivingly connected to the power shaft of the pump motor (2) and the other end of which is drivingly connected to the impeller (31); The filter assembly (32) has a first state and a second state: When the filter assembly (32) is in the first state, the drain trough (3203) is sealed and inserted into the liquid inlet (302); When the filter assembly (32) is in the second state, the drain tank (3203) is located outside the liquid inlet (302) and communicates with the external space.

2. The anti-blocking submersible pump according to claim 1, characterized in that: The liquid pump assembly (3) includes a liquid pump housing (33) fixedly connected to the connection assembly (1), the pump body flow channel (301) is opened in the liquid pump housing (33), a rotating ring (34) is installed in the liquid inlet (302) by a rotating connection method with the axial direction of the liquid inlet (302) as the center line, the sliding part (3202) is connected to the rotating ring (34) by a sliding method, and can move along the rotation center direction of the rotating ring (34), the filter component (32) is provided with a plurality of crushing teeth (321) at one end facing the liquid inlet (302), and a spring (35) is mounted on the outer wall of the filter part (3201), one end of the spring (35) is in conflict with the filter part (3201), and the other end of the spring (35) is in conflict with the rotating ring (34), and the elastic force of the spring (35) pushes the filter part (3201) to move in a direction close to the connection assembly (1).

3. The anti-blocking submersible pump according to claim 2, characterized in that: The filter portion (3201) includes a filter element 1 (322), and the sliding portion (3202) includes a filter element 2 (323). The filter element 1 (322) is fixedly connected to the filter element 2 (323). The filter element 1 (322) is arranged at one end facing away from the liquid inlet (302). A filter cavity (3221) is provided in the filter element 1 (322). A plurality of filter holes (3222) are provided on the outer wall of the filter element 1 (322). A through-flow groove (3231) is provided in the filter element 2 (323) along the sliding direction of the filter element. The sewage trough (3203) is provided on the outer surface of the filter element 2 (323) and is connected to the flow groove (3231). The crushing tooth (321) is provided at one end of the filter element 2 (323) facing the liquid inlet (302).

4. The anti-blocking submersible pump according to claim 3, characterized in that: A sliding groove (341) penetrating the rotating ring (34) is provided on the inner wall of the rotating ring (34); a sliding bar (3232) matching the sliding groove (341) is provided on the outer wall of the second filter element (323); the sliding bar (3232) is slidably inserted into the sliding groove (341); a limiting flange (3233) is provided on the end of the second filter element (323) facing the direction close to the first filter element (322); a limiting ring (324) is fixed on the end of the second filter element (323) facing away from the first filter element (322); the limiting flange (3233) and the limiting ring (324) are in conflict with the two ends of the sliding bar (3232).

5. The anti-blocking submersible pump according to claim 4, characterized in that: A conical guide block (325) is provided in the second filter element (323), and the crushing teeth (321) are evenly arranged with the conical guide block (325) as the center.

6. The anti-blocking submersible pump according to claim 5, characterized in that: The conical guide block (325) is provided with a conical portion 1 (3251) at one end thereof facing the direction closer to the filter element 1 (322), and a conical portion 2 (3252) at one end thereof facing the direction away from the filter element 1 (322).

7. The anti-blocking submersible pump according to claim 3, characterized in that: A plurality of vortex guide plates (3223) are provided on the inner wall of the filter cavity (3221), and a diverter (3224) is fixed at the center of the bottom of the filter cavity (3221).

8. The anti-blocking submersible pump according to claim 7, characterized in that: The liquid pump housing (33) includes a liquid pump housing (331), a guide cavity (332) is provided at the upper end of the liquid pump housing (331), a plug-in slot (333) is provided at the bottom of the guide cavity (332), a pump body bearing (36) is inserted and fixed in the plug-in slot (333), the impeller (31) is plug-in and fixed to the inner ring of the pump body bearing (36), a housing hole (334) penetrating the liquid pump housing (331) is provided at the bottom of the plug-in slot (333), and the liquid pump housing (331) is provided with a plurality of holes. An upper sealing ring (335) fixedly connected to the connecting assembly (1) is fixed to the upper end of the liquid pump housing (31); the end of the connecting shaft (11) passes through the upper sealing ring (335) and is drivingly connected to the impeller (31); a lower connecting seat (336) is fixed to the lower end of the liquid pump housing (331); a lower channel (3361) penetrating the lower connecting seat (336) is provided in the lower connecting seat (336); and the rotating ring (34) is installed in the lower channel (3361) in a rotating manner.

9. The anti-blocking submersible pump according to claim 8, characterized in that: The lower connecting seat (336) includes a lower seat body (3362) and a bottom sealing ring (3363). The lower end of the lower seat body (3362) is provided with a rotation groove (33621). The rotating ring (34) is rotatably inserted into the rotation groove (33621). The bottom sealing ring (3363) is fixed to the lower end of the lower seat body (3362) and contacts the lower end of the rotating ring (34).

10. The anti-blocking submersible pump according to claim 9, characterized in that: A limiting convex ring (33611) is provided in the lower channel (3361), and a plurality of limiting tooth grooves (33612) are provided at the lower end of the limiting convex ring (33611). A limiting convex tooth (3234) matching the limiting tooth groove (33612) is provided at one end of the filter element 2 (323) facing the limiting convex ring (33611).

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