Permanent magnet submersible sewage pump with anti-blocking function

Abstract

This invention belongs to the field of submersible sewage pump technology, specifically a permanent magnet submersible sewage pump with anti-clogging function. It includes a pump body, a motor and an annular filter screen coaxially fixedly connected to the pump body, and two axially arranged turntables coaxially fixedly connected to the motor output shaft. Bearings are coaxially mounted on the turntables, and the connection port is located between two piston rings. A flow sensor is fixed in the inner annular chamber. Armatures are fixed on both sides of the radial transmission rod, and coil assemblies are correspondingly arranged thereon. Locking rod assemblies are provided on both sides of the radial transmission rod, and the locking rod assemblies are slidably connected to the annular plate of the double annular chamber, with one end abutting against the radial transmission rod. Several annularly distributed axial transmission rod assemblies are fixed on the piston rings, and the axial transmission rod assemblies are drively connected to the outer end of the radial transmission rod. When the flow sensor detects blockage in the annular filter screen, it uses electromagnetic drive to cause the piston rings to slide back and forth in the outer annular chamber, generating a high-pressure water flow that flows backward through the mesh of the annular filter screen to the outside, flushing away the blockage and achieving powerful backwashing and unblocking.

Description

Technical Field

[0001] This invention belongs to the field of submersible sewage pump technology, specifically a permanent magnet submersible sewage pump with anti-clogging function. Background Technology

[0002] Permanent magnet submersible sewage pumps are used in water pumping operations, especially when treating sewage containing impurities. However, existing permanent magnet submersible sewage pumps have the following drawbacks: Firstly, their filters, connecting ports, and internal inlets are easily clogged by impurities, leading to reduced pumping efficiency or even failure to operate normally, and there is a lack of effective unclogging mechanisms to quickly resolve the clogging problem; secondly, the equipment usually runs continuously, even when no clogging occurs, without stopping the cleaning action, which not only wastes energy but also causes accelerated wear on components such as piston rings due to long-term ineffective operation, shortening the service life of the equipment. Summary of the Invention

[0003] The purpose of this invention is to provide a permanent magnet submersible sewage pump with anti-clogging function to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A permanent magnet submersible sewage pump with anti-clogging function includes a pump body, a motor and an annular filter screen coaxially fixedly connected to the pump body, an output shaft coaxially fixedly connected to the motor output end, an outlet at the right end of the pump body, two axially arranged turntables coaxially fixedly connected to the output shaft, bearings coaxially mounted on the turntables, the inner rings of the bearings fixedly connected to the turntables, a double-annular cavity annular plate coaxially rotatably connected to the inner cavity of the annular filter screen, the outer ring of the bearings fixedly connected to the inner ring of the double-annular cavity annular plate, the outer ring of the double-annular cavity annular plate rotatably connected to the inner wall of the annular filter screen, an outer annular chamber and an inner annular chamber coaxially formed on the double-annular cavity annular plate, the outer annular chamber communicating with the outside through the filter screen mesh, and the inner annular chamber communicating with the outside through the filter screen mesh. The port communicates with the outer annular chamber. Two piston rings are coaxially slidably connected inside the outer annular chamber. The communication port is located between the two piston rings. An inner flow port corresponding to the inner annular chamber is opened on the right side of the double annular plate. A flow sensor is fixed inside the inner annular chamber. Several annularly distributed radial transmission rods are radially slidably connected to the double annular plate. Armatures are fixed on both sides of the radial transmission rods and coil assemblies are set accordingly. Locking rod assemblies are provided on both sides of the radial transmission rods. The locking rod assemblies are slidably connected to the double annular plate and one end abuts against the radial transmission rod. Corresponding locking holes are opened on the turntable. Several annularly distributed axial transmission rod assemblies are fixed on the piston rings. The axial transmission rod assemblies are connected to the outer ends of the radial transmission rods.

[0005] Preferably, each of the radial transmission rods includes a slide rod, which is slidably connected to the double-ring cavity annular plate. A triangular push block is fixedly connected to one end of the slide rod near the axis of the double-ring cavity annular plate, and the triangular push block abuts against the locking rod assembly.

[0006] Preferably, an inclined groove is provided at one end of the slide rod away from the axis of the double-ring cavity annular plate, and a connecting rod is fixedly connected to the middle position of the slide rod, and the connecting rod is fixedly connected to the armature.

[0007] Preferably, each of the coil assemblies includes a coil body, which is fixedly connected to the inner wall of the double-ring cavity annular plate. A guide rod is coaxially arranged with the coil body, which is fixedly connected to the inner wall of the double-ring cavity annular plate and coaxially arranged with the coil body (401).

[0008] Preferably, the armature is slidably connected to the guide rod, and a radial spring is coaxially provided with the guide rod. One end of the radial spring is fixedly connected to the armature, and the other end of the radial spring is fixedly connected to the double-ring cavity annular plate.

[0009] Preferably, each of the locking rod assemblies includes a locking rod body, the locking rod body is slidably connected to the double-ring cavity annular plate, both ends of the locking rod body are fixedly connected to ball blocks, an axial spring is sleeved on the locking rod body, one ball block abuts against the triangular push block, and the other ball block is disposed in the lock hole.

[0010] Preferably, the axial transmission rod assembly includes a transmission rod body, one end of which is fixedly connected to a piston ring, and the other end of which is fixedly connected to a connecting block. A sliding shaft is fixedly connected to the end of the connecting block near the inclined groove, and the sliding shaft is slidably connected to the inclined groove.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When the flow sensor of this invention detects that the annular filter screen is blocked, it uses electromagnetic drive to make the piston ring slide back and forth in the outer annular chamber, generating a high-pressure water flow that flows in the opposite direction through the mesh of the annular filter screen to the outside, thereby flushing away the blockage and achieving powerful backwashing and unblocking. 2. The present invention utilizes the cooperation between the locking rod assembly and the turntable. When the annular filter screen is de-energized and the locking rod assembly is inserted into the locking hole, the double-ring cavity annular plate rotates at high speed with the output shaft. Under the action of centrifugal force, the dirt attached to the filter screen and the double-ring cavity annular plate is thrown away from the inner outlet or connecting outlet, further assisting in cleaning and preventing blockage. 3. The cleaning action of this invention is triggered only when the flow sensor detects that the annular filter screen is clogged. It is an intermittent working mode, which avoids wear and energy waste caused by long-term ineffective operation of the piston ring, extends the service life of the equipment, and reduces energy consumption. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the annular filter screen structure of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the double-ring cavity annular plate of the present invention; Figure 4 This is a three-dimensional cross-sectional view of the double-ring cavity annular plate structure of the present invention; Figure 5 This is a front view of the three-dimensional structure of the double-ring cavity annular plate of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A; Figure 7 This is a three-dimensional sectional view of the turntable structure of the present invention; Figure 8 For the present invention Figure 7 A magnified structural diagram at point B in the middle.

[0013] In the diagram: 1. Pump body; 2. Motor; 3. Output shaft; 4. Annular filter screen; 5. Outlet; 6. Turntable; 61. Lock hole; 7. Bearing; 8. Double-ring cavity annular plate; 81. Outer annular chamber; 82. Inner annular chamber; 83. Connecting port; 84. Inner flow port; 9. Piston ring; 10. Sensor; 20. Radial transmission rod; 201. Slide rod; 202. Triangular push block; 203. Inclined groove; 204. Connecting rod; 30. Armature; 40. Coil assembly; 401. Coil body; 402. Guide rod; 403. Radial spring; 50. Locking rod assembly; 501. Locking rod body; 502. Ball block; 503. Axial spring; 60. Axial transmission rod assembly; 601. Transmission rod body; 602. Connecting block; 603. Sliding shaft. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] A permanent magnet submersible sewage pump with anti-clogging function, such as Figures 1-5 , Figure 7 and Figure 8As shown, the device includes an electric pump body 1, a motor 2 and an annular filter screen 4 coaxially fixedly connected to the electric pump body 1, an output shaft 3 coaxially fixedly connected to the output end of the motor 2, an outlet 5 at the right end of the electric pump body 1, two axially arranged turntables 6 coaxially fixedly connected to the output shaft 3, bearings 7 coaxially mounted on the turntables 6, the inner ring of the bearings 7 fixedly connected to the turntables 6, a double-ring annular plate 8 coaxially rotatably connected to the inner cavity of the annular filter screen 4, the outer ring of the bearings 7 fixedly connected to the inner ring of the double-ring annular plate 8, and the outer ring of the double-ring annular plate 8 rotatably connected to the inner wall of the annular filter screen 4. An outer annular chamber 81 and an inner annular chamber 82 are coaxially formed on the double-ring annular plate 8. The outer annular chamber 81 communicates with the outside through the filter screen mesh, and the inner annular chamber 82 communicates with the outer annular chamber 81 through a connecting port 83. Two piston rings 9 are coaxially slidably connected inside the cavity 81. The communication port 83 is located between the two piston rings 9. An inner flow port 84 corresponding to the inner annular cavity 82 is opened on the right side of the double annular plate 8. A flow sensor 10 is fixed inside the inner annular cavity 82. Several annularly distributed radial transmission rods 20 are radially slidably connected on the double annular plate 8. Armatures 30 are fixed on both sides of the radial transmission rods 20 and coil assemblies 40 are set accordingly. Locking rod assemblies 50 are provided on both sides of the radial transmission rods 20. The locking rod assemblies 50 are slidably connected to the double annular plate 8 and one end abuts against the radial transmission rods 20. A corresponding locking hole 61 is opened on the turntable 6. Several annularly distributed axial transmission rod assemblies 60 are fixed on the piston rings 9. The axial transmission rod assemblies 60 are connected to the outer end of the radial transmission rods 20. When water needs to be pumped, the electric pump body 1 is placed in the water tank to be pumped. Since the output shaft 3 is fixedly connected to the impeller, the motor 2 is started. The output shaft 3 of the motor 2 drives the impeller to rotate. The water in the impeller is thrown to the outer edge of the impeller under the action of centrifugal force, forming a certain pressure and flow velocity, and is discharged from the outlet 5 of the electric pump body 1. At the same time, due to the high-speed rotation of the impeller, a low-pressure zone is formed at the center of the impeller. Due to the low-pressure zone formed at the center of the impeller, the water in the water tank is continuously drawn into the electric pump body 1 through the annular filter screen 4 under the action of atmospheric pressure or liquid level difference, thereby achieving the purpose of continuous pumping and transportation of water. When the output shaft 3 rotates, it drives the two turntables 6 fixedly connected to it to rotate synchronously. When the turntables 6 rotate, they drive the inner ring of the bearing 7 fixedly connected to them to rotate synchronously. This causes the inner ring of the bearing 7 to rotate along with the two turntables 6, so that the inner ring of the bearing 7 rotates relative to the outer ring of the bearing 7. That is, the two turntables 6 rotate relative to the double-ring cavity annular plate 8. When the motor 2 is started, it drives the output shaft 3 to rotate synchronously, which in turn drives the impeller to rotate synchronously. Due to the high-speed rotation of the impeller, a low-pressure zone is formed at the center of the impeller. Under the action of atmospheric pressure or liquid level difference, the water in the pool is continuously drawn into the electric pump body 1 through the mesh of the annular filter screen 4. Then the water enters the outer annular cavity 81, and then enters the inner annular cavity 82 through the connecting port 83 and flows out through the inner flow port 84, flowing to the outlet 5 at the right end of the electric pump body 1. When the flow sensor 10 detects blockage in the mesh, connecting port 83, or inner flow port 84 of the annular filter 4, the flow sensor 10 transmits the monitoring information to the controller (the controller is prior art and not shown in the figure). The controller controls the coil assembly 40 to be intermittently energized. When the coil assembly 40 is energized, it generates a magnetic field. The magnetic field causes the armature 30 to drive the radial transmission rod 20 to move away from the axis of the double-ring cavity annular plate 8. When the coil assembly 40 is de-energized, the magnetic field disappears, and the radial transmission rod 20 moves towards the axis of the double-ring cavity annular plate 8. The controller control coil assembly 40 is intermittently energized, causing the radial transmission rod 20 to reciprocate radially in the double-ring cavity annular plate 8. When the coil assembly 40 is energized, the armature 30 drives the radial transmission rod 20 to move away from the axis of the double-ring cavity annular plate 8, thereby releasing the abutment of the end of the radial transmission rod 20 near the axis of the double-ring cavity annular plate 8 from the locking rod assembly 50, thus releasing the squeezing effect on the locking rod assembly 50. At this time, the locking rod assembly 50 disengages from the lock hole 61, and the output shaft 3 will not drive the locking rod assembly 50 and the double-ring cavity annular plate 8 to rotate when it drives the turntable 6 to rotate. When the coil assembly 40 is de-energized, the armature 30 drives the radial transmission rod 20 to reset, that is, to move towards the axis of the double-ring cavity annular plate 8. This causes the end of the radial transmission rod 20 near the axis of the double-ring cavity annular plate 8 to abut against the locking rod assembly 50 again, thereby re-forming the compressive force on the locking rod assembly 50. At this time, the locking rod assembly 50 is re-inserted into the locking hole 61. At this time, the output shaft 3 drives the turntable 6 to rotate, which in turn drives the locking rod assembly 50 and the double-ring cavity annular plate 8 to rotate. During the reciprocating movement of the radial transmission rod 20 in the radial direction of the double-ring cavity annular plate 8, the two piston rings 9 slide towards or away from each other in the outer annular cavity 81 through the transmission action. When the flow rate is transmitted... When the sensor 10 detects that the annular filter 4 is clogged, the piston ring 9 is driven by electromagnetic drive to slide back and forth in the outer annular chamber 81. When the piston ring 9 moves towards each other and compresses the chamber, it can generate a high-pressure water flow that flows in the opposite direction through the mesh of the annular filter 4 to the outside, flushing away the impurities that are clogged on the outside of the mesh and achieving powerful backwashing and unclogging. Through the cooperation of the locking rod assembly 50 and the locking hole 61 on the turntable 6, when the annular filter 4 is de-energized and the locking rod assembly 50 is inserted into the locking hole 61, the double annular chamber annular plate 8 rotates at high speed with the output shaft 3. Then, under the action of centrifugal force, the dirt attached to the filter and the double annular chamber annular plate 8 is thrown away from the inner flow port 84 or the connecting port 83, which assists in cleaning. The locking rod assembly 50, in conjunction with the turntable 6, controls the on / off transmission of power between the output shaft 3 and the double-ring chamber annular plate 8. Under normal pumping or centrifugal cleaning, the locking rod is inserted, and the double-ring chamber annular plate 8 rotates with the shaft, using centrifugal force for anti-fouling. In backwashing mode, the locking rod disengages, and the double-ring chamber annular plate 8 remains relatively stationary. At this time, the piston ring 9 moves axially to avoid interference from the rotational centrifugal force on the axial movement of the piston ring 9. The cleaning action is triggered only when the flow sensor 10 detects blockage in the annular filter screen 4, which is an intermittent working mode, avoiding wear and energy waste caused by long-term ineffective operation of the piston ring 9.

[0016] like Figures 5-8As shown, each of the radial transmission rods 20 includes a slide rod 201, which is slidably connected to the double-ring cavity annular plate 8. A triangular push block 202 is fixedly connected to one end of the slide rod 201 near the axis of the double-ring cavity annular plate 8. The triangular push block 202 abuts against the locking rod assembly 50. When the slide rod 201 moves away from the axis of the double-ring cavity annular plate 8, it drives the triangular push block 202 to move synchronously, and the triangular push block 202 disengages from the locking rod assembly 50, that is, the triangular push block 202 releases its contact with the locking rod assembly 50. When the locking lever assembly 50 is pressed down, it resets, meaning it disengages from the lock hole 61. The turntable 6 rotates relative to the locking lever assembly 50, which in turn causes the turntable 6 to rotate relative to the double-ring cavity annular plate 8. When the slide rod 201 moves towards the axis of the double-ring cavity annular plate 8, the triangular push block 202 presses the locking lever assembly 50 again, causing it to re-insert into the lock hole 61. At this time, the turntable 6 drives the locking lever assembly 50 to rotate synchronously, which in turn drives the double-ring cavity annular plate 8 to rotate.

[0017] A slanted groove 203 is provided at one end of the slide rod 201 away from the axis of the annular plate 8 of the double annular cavity. A connecting rod 204 is fixedly connected to the middle position of the slide rod 201, and the connecting rod 204 is fixedly connected to the armature 30.

[0018] Each of the several coil assemblies 40 includes a coil body 401, which is fixedly connected to the inner wall of the double-ring cavity annular plate 8. When the flow sensor 10 detects that the mesh, connecting port 83 or inner flow port 84 of the annular filter screen 4 is blocked, the controller controls the coil body 401 to be energized, thereby generating a magnetic field. A guide rod 402 is coaxially arranged with the coil body 401, and the guide rod 402 is fixedly connected to the inner wall of the double-ring cavity annular plate 8 and coaxially arranged with the coil body 401.

[0019] The armature 30 is slidably connected to the guide rod 402. Under the action of the magnetic field generated by the coil body 401, the armature 30 drives the connecting rod 204, the sliding rod 201, the triangular push block 202, and the inclined slot 203 to move synchronously away from the axis of the double-ring cavity annular plate 8. A radial spring 403 is coaxially arranged with the guide rod 402. One end of the radial spring 403 is fixedly connected to the armature 30, and the other end of the radial spring 403 is fixedly connected to the double-ring cavity annular plate 8. When the armature 30 drives the connecting rod 204, the sliding rod 201, and the triangular push block 202... When the inclined slot 203 moves synchronously away from the axis of the double-ring cavity annular plate 8, the radial spring 403 is stretched. When the coil body 401 is de-energized, under the action of the radial spring 403, the armature 30 moves towards the axis of the double-ring cavity annular plate 8, thereby driving the connecting rod 204, the slide rod 201, the triangular push block 202 and the inclined slot 203 to move synchronously towards the axis of the double-ring cavity annular plate 8, thereby realizing the reciprocating movement of the slide rod 201, the triangular push block 202 and the inclined slot 203 in the radial direction of the double-ring cavity annular plate 8.

[0020] Each of the several locking rod assemblies 50 includes a locking rod body 501, which is slidably connected to the double-ring cavity annular plate 8. Ball blocks 502 are fixedly connected to both ends of the locking rod body 501. An axial spring 503 is sleeved on the locking rod body 501. One ball block 502 abuts against a triangular push block 202, and the other ball block 502 is disposed within the lock hole 61. When the triangular push block 202 moves away from the axis of the double-ring cavity annular plate 8, the triangular push block 202 releases the pressure on one ball block 502, thereby allowing the locking rod body 501 to abut against its two ends. Under the elastic force of the axial spring 503, the ball block 502 moves, causing another ball block 502 located in the lock hole 61 to disengage from the lock hole 61. This causes the turntable 6 to rotate relative to the double-ring cavity annular plate 8. When the triangular push block 202 moves towards the axis of the double-ring cavity annular plate 8, the triangular push block 202 presses one of the ball blocks 502 again, causing the lock rod body 501 to drive the other ball block 502 to insert into the lock hole 61. At the same time, the axial spring 503 is compressed again. At this time, the turntable 6 drives the double-ring cavity annular plate 8 to rotate synchronously.

[0021] like Figure 6 As shown, the axial transmission rod assembly 60 includes a transmission rod body 601. One end of the transmission rod body 601 is fixedly connected to the piston ring 9, and the other end of the transmission rod body 601 is fixedly connected to a connecting block 602. The end of the connecting block 602 near the inclined groove 203 is fixedly connected to a sliding shaft 603. The sliding shaft 603 is slidably connected to the inclined groove 203. When the inclined groove 203 moves away from the axis of the double-ring cavity annular plate 8, the sliding shaft 603 causes the connecting block 602, the transmission rod body 601, and the piston ring 9 to move towards the middle, that is, the two pistons move towards each other. When the inclined groove 203 moves towards the axis of the double-ring cavity annular plate 8, the two pistons move away from each other.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A permanent magnet submersible sewage pump with anti-clogging function, characterized in that, The pump body (1) is coaxially fixedly connected to a motor (2) and an annular filter screen (4). The output end of the motor (2) is coaxially fixedly connected to an output shaft (3). An outlet (5) is opened at the right end of the pump body (1). The output shaft (3) is coaxially fixedly connected to two axially arranged turntables (6). A bearing (7) is coaxially installed on the turntables (6). The inner ring of the bearing (7) is fixedly connected to the turntable (6). The inner cavity of the annular filter screen (4) is coaxially rotatably connected to a double-ring annular plate (8). The outer ring of the bearing (7) is fixedly connected to the inner ring of the double-ring annular plate (8). The outer ring of the double-ring annular plate (8) is rotatably connected to the inner wall of the annular filter screen (4). An outer annular chamber (81) and an inner annular chamber (82) are coaxially opened on the double-ring annular plate (8). The outer annular chamber (81) is connected to the outside through the filter screen mesh. The inner annular chamber (82) is connected to the outer annular chamber (81) through a connecting port (83). Two piston rings (9) are coaxially slidably connected inside the cavity (81). The connecting port (83) is located between the two piston rings (9). An inner flow port (84) corresponding to the inner annular cavity (82) is opened on the right side of the double annular cavity plate (8). A flow sensor (10) is fixed inside the inner annular cavity (82). Several annularly distributed radial transmission rods (20) are radially slidably connected on the double annular cavity plate (8). An armature (30) is fixed on both sides of the radial transmission rod (20) and a coil assembly (40) is set accordingly. Locking rod assemblies (50) are provided on both sides of the radial transmission rod (20). The locking rod assembly (50) is slidably connected to the double annular cavity plate (8) and one end abuts against the radial transmission rod (20). A corresponding locking hole (61) is opened on the turntable (6). Several annularly distributed axial transmission rod assemblies (60) are fixed on the piston ring (9). The axial transmission rod assembly (60) is connected to the outer end of the radial transmission rod (20).

2. A permanent magnet submersible sewage pump with anti-clogging function according to claim 1, characterized in that, Each of the radial transmission rods (20) includes a slide rod (201), which is slidably connected to the double-ring cavity annular plate (8). A triangular push block (202) is fixedly connected to one end of the slide rod (201) near the axis of the double-ring cavity annular plate (8), and the triangular push block (202) abuts against the locking rod assembly (50).

3. A permanent magnet submersible sewage pump with anti-clogging function according to claim 2, characterized in that, A slanted groove (203) is provided at one end of the slide rod (201) away from the axis of the double-ring cavity annular plate (8). A connecting rod (204) is fixedly connected to the middle position of the slide rod (201), and the connecting rod (204) is fixedly connected to the armature (30).

4. A permanent magnet submersible sewage pump with anti-clogging function according to claim 1, characterized in that, Each of the coil assemblies (40) includes a coil body (401), which is fixedly connected to the inner wall of the double-ring cavity annular plate (8). A guide rod (402) is coaxially arranged with the coil body (401), which is fixedly connected to the inner wall of the double-ring cavity annular plate (8) and coaxially arranged with the coil body (401).

5. A permanent magnet submersible sewage pump with anti-clogging function according to claim 4, characterized in that, The armature (30) is slidably connected to the guide rod (402), and a radial spring (403) is coaxially provided with the guide rod (402). One end of the radial spring (403) is fixedly connected to the armature (30), and the other end of the radial spring (403) is fixedly connected to the double-ring cavity annular plate (8).

6. A permanent magnet submersible sewage pump with anti-clogging function according to claim 2, characterized in that, Each of the locking rod assemblies (50) includes a locking rod body (501), which is slidably connected to the double-ring cavity annular plate (8). Both ends of the locking rod body (501) are fixedly connected to ball blocks (502). An axial spring (503) is sleeved on the locking rod body (501). One ball block (502) abuts against the triangular push block (202), and the other ball block (502) is disposed in the lock hole (61).

7. A permanent magnet submersible sewage pump with anti-clogging function according to claim 3, characterized in that, The axial transmission rod assembly (60) includes a transmission rod body (601), one end of which is fixedly connected to a piston ring (9), and the other end of which is fixedly connected to a connecting block (602). A sliding shaft (603) is fixedly connected to one end of the connecting block (602) near the inclined groove (203), and the sliding shaft (603) is slidably connected to the inclined groove (203).

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