Submerged slurry lift pump

Abstract

The application discloses a submerged liquid type slurry lifting pump, which comprises a pump body, a jetting device for washing and stirring fluid at the inlet, a pressure bearing assembly comprising a backflow blocking groove for preventing fluid backflow and a sand prevention groove for preventing impurity accumulation, a sleeve bearing with a washing through hole for preventing impurity accumulation, a skeleton seal for sealing the sleeve bearing, a power sealing device comprising a water throwing structure for sealing a shaft bearing device, a cooling washing device and an overflow pipe device, and the water level height of the outlet of the overflow pipe device is lower than the water inlet height of the cooling washing device; the backflow blocking groove and the sand prevention groove are matched with a sand blocking ring to prevent fluid backflow and impurity accumulation; meanwhile, the pump body assembly and the inlet fluid are washed by the cooling washing device and the jetting device; meanwhile, the sleeve bearing is provided with the washing through hole, so that impurities are prevented from accumulating at the hub part of the impeller, and the erosion and abrasion of slurry particles on the flow part are effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pumps, and more specifically to a submersible slurry lift pump with a simple and compact overall structure, easy maintenance and installation, and high efficiency and reliability. Background Technology

[0002] Submersible slurry lift pumps use submersible pumps to lift slurry from the bottom to the top, and have been widely used in industries such as petroleum, chemical, steel, papermaking, printing and dyeing, and environmental protection to transport various slurry fluids.

[0003] Existing submersible pumps have the following drawbacks:

[0004] 1. The rotor support of the existing submersible pump is not ideal. The rotor is supported by a combination of rolling bearings and sliding bearings. The sliding bearings are usually immersed in the fluid. If the fluid contains solid particles, it will cause the bearings to wear faster and have a shorter lifespan.

[0005] 2. The existing submersible pump uses a set of rolling bearings mounted on the mounting base, which results in an excessively long shaft cantilever with large deflection, and a relatively thick shaft diameter with large axial force;

[0006] 3. Existing submersible pumps use packing seals or mechanical seals, which require frequent maintenance and have low reliability; mechanical seals operate in unfavorable environments, and when conveying particulate fluids, they suffer severe erosion and wear, which restricts sealing performance and shortens service life.

[0007] 4. When existing submersible pumps malfunction, it is difficult to observe and diagnose the problem. Submersible pumps lack any fault protection or warning measures, and faults cannot be eliminated or maintained in a timely manner.

[0008] These defects in existing submersible pumps reduce their operational reliability and increase operating and maintenance costs.

[0009] Therefore, how to make submersible pumps operate reliably and be easy to install and maintain has become an urgent problem to be solved in this field. Summary of the Invention

[0010] In view of the shortcomings of the prior art, the purpose of this invention is to provide a submersible slurry booster pump that is reliable in operation and easy to install and maintain.

[0011] To achieve the above objectives, the present invention provides a submersible slurry lifting pump, comprising a pump body, the pump body including a suction inlet, a pump casing, a pump shaft, an impeller, an outlet pipe, a first protective pipe, and a second protective pipe. The bottom of the pump casing is connected to the suction inlet, and one side is connected to the outlet pipe. The impeller is disposed within the pump casing. The pump shaft has first protective pipes on both sides and a second protective pipe at the top. The pump body is characterized by further comprising:

[0012] A jetting device is installed at the inlet of the pump body to flush and agitate the fluid at the pump inlet.

[0013] The pressure-bearing assembly, disposed on the pump casing, includes a backflow prevention groove to prevent fluid backflow and a sand-proof groove to prevent impurity accumulation.

[0014] A sleeve bearing, disposed on the pump shaft, includes a flushing through-hole to prevent the accumulation of impurities in the fluid.

[0015] A skeleton seal is provided on the impeller to seal the sleeve bearing.

[0016] A coupling bearing assembly, which is mounted on the pump shaft of the pump body, includes an integrated coupling and roller bearings.

[0017] A dynamic sealing device, disposed on the lower side of the coupling bearing assembly, includes a water-throwing structure for sealing the coupling bearing assembly.

[0018] A cooling and rinsing device is provided, with one end connected to the outlet pipe and the other end connected to a first protective pipe communicating with the sleeve bearing, for cooling and rinsing the sleeve bearing.

[0019] An overflow pipe device is provided, with one end connected to the first protective pipe and the other end connected to the second protective pipe. The overflow pipe device is connected to a water tank via a sump installed on it. The outlet water level of the overflow pipe device is lower than the inlet water level of the cooling flushing device to prevent fluid overflow from the first protective pipe from damaging the coupling bearing device.

[0020] Furthermore, it also includes a strainer screen, which is disposed at the suction inlet to filter the intake fluid and prevent air from entering the pump body.

[0021] Furthermore, the suction port is a flared structure with different sizes at both ends. The larger end of the suction port is connected to the waste rack, and the smaller end is connected to the pump casing.

[0022] Furthermore, the spraying device includes a spray nozzle, a valve core, a spring, and a water inlet pipe. The spray nozzle is connected to the water inlet pipe, and the valve core and spring are provided inside the spray nozzle.

[0023] Furthermore, the pump casing includes a front pump casing, a volute casing, and a rear pump casing, and the backflow blocking grooves are disposed on the front pump casing, the number of which is coprime to the number of the impeller back blades.

[0024] Furthermore, the rear pump housing has several annular anti-sand grooves on its end face, and the anti-sand grooves are an integral structure with the rear pump housing.

[0025] Furthermore, the impeller includes a back blade, a sand-blocking ring, and an auxiliary blade, which are integrated into one structure. The back blade and the auxiliary blade are each provided with a balancing groove.

[0026] Furthermore, the sand-blocking ring has a circular structure, and the back blades are evenly distributed on the circumference of the sand-blocking ring, with a diameter larger than the cross-sectional diameter of the sand-blocking ring.

[0027] Furthermore, the dynamic sealing device includes an auxiliary impeller, a sealing box, and a transmission key. The auxiliary impeller and the sealing box are an integrated structure, and the pump shaft is connected through the transmission key.

[0028] Furthermore, the water-throwing structure includes a liquid-throwing ring, which can throw away fluid through the centrifugal force generated by its rotation.

[0029] The submersible slurry booster pump provided by this invention features a backflow blocking groove and a sand-proof groove on the pump casing, along with back blades and sand-blocking rings on the impeller to prevent fluid backflow and impurity accumulation. Simultaneously, a cooling flushing device and a jetting device are used to flush the pump body components and the inlet fluid. Furthermore, a flushing through-hole is provided on the sleeve bearing to prevent impurities from accumulating at the impeller hub, effectively reducing the scouring and wear of the flow components by slurry particles.

[0030] The submersible slurry lifting pump provided by the present invention integrates the coupling and roller bearing into one unit using a coupling bearing device. Compared with the split design of existing submersible pumps, it has a compact structure, reduces the pump shaft length and the number of parts, and is easy to install.

[0031] The submersible slurry booster pump provided by this invention adopts a dynamic sealing device with a water-throwing structure, which can throw out fluid particles without wear and loss of components, greatly improving operational reliability and pump operating efficiency.

[0032] The submersible slurry booster pump provided by this invention uses an overflow pipe device with an outlet water level lower than the inlet water level of the cooling and flushing device. The fluid in the cooling and flushing device flows into the water tank through the overflow pipe device, preventing the water level from rising and flooding into the bearing components. Compared with the present invention, this avoids the problem of submersible pumps having no fault protection measures.

[0033] The submersible slurry booster pump provided by this invention is reliable in operation and easy to install and maintain. Attached Figure Description

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] Figure 1 This is a cross-sectional view of the overall structure of the submersible slurry lift pump provided by the present invention.

[0036] Figure 2 This is a schematic diagram of the spraying device in this invention;

[0037] Figure 3 This is a schematic diagram of the structure of the waste rack in this invention;

[0038] Figures 4a to 4c This is a schematic diagram of the pump casing in this invention;

[0039] Figures 5a to 5c This is a schematic diagram of the impeller structure in this invention;

[0040] Figure 6 This is a schematic diagram of the sleeve bearing device in this invention;

[0041] Figure 7 This is a schematic diagram of the structure of the coupling bearing device in this invention;

[0042] Figure 8 This is a schematic diagram of the dynamic sealing device in this invention.

[0043] Figure 9 This is a schematic diagram of the overflow pipe device in this invention;

[0044] Figure label:

[0045] 1. Spraying device; 101. Spray nozzle; 102. Valve core; 103. Spring; 104. Water inlet pipe;

[0046] 2. Trash rack; 201. Filter structure; 202. Swirl prevention structure; 3. Inlet;

[0047] 4. Pump casing; 401. Front pump casing; 40101. Backflow blocking groove; 402. Volute; 403. Rear pump casing; 40301. Sand guard groove;

[0048] 5. Impeller; 501. Back blade; 502. Sand baffle ring; 503. Auxiliary blade; 504. Back blade balance groove; 505. Auxiliary blade balance groove; 506. Hub; 6. Frame seal;

[0049] 7. Sleeve bearing assembly; 701. Bearing support; 702. Guide bearing; 703. Flushing through hole; 8. Pump shaft; 9. First protective pipe; 10. Pipe support device;

[0050] 11. Overflow pipe assembly; 1101. Piping assembly; 1102. Liquid collector; 12. Motor bracket; 13. Motor;

[0051] 14. Coupling and bearing assembly; 1401. Pump coupling; 1402. Motor coupling; 1403. Motor key; 1404. Pump key; 1405. Bearing housing; 1406. Locating circlip; 1407. Perforated body; 1408. Roller bearing;

[0052] 15. Cooling and rinsing device; 16. Outlet short-circuit; 17. Support base; 18. Second protective pipe;

[0053] 19. Dynamic sealing device; 1901. Primary auxiliary impeller; 1902. Primary sealing box; 1903. Secondary auxiliary impeller; 1904. Secondary sealing box; 1905. Transmission key; 1906. Locking nut; 1907. Jet ring;

[0054] 20. Outlet pipe; 21. Outlet elbow; 22. Drain ball valve; 23. Impeller locking component. Detailed Implementation

[0055] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0056] The submersible slurry booster pump provided by this invention uses a pump casing with a backflow blocking groove and a sand-proof groove, a sleeve bearing with a flushing through hole, a jetting device, and a cooling flushing device to flush the pump body components, preventing impurities from accumulating at the impeller hub and effectively reducing the scouring and wear of slurry particles on the flow parts; at the same time, the overflow pipe device is used to ensure that the outlet water level is lower than the inlet water level of the cooling flushing device, so as to promptly remove fluid overflow from the protective pipe that may damage the bearing and eliminate the fault.

[0057] See Figure 1 The illustration shows an example of a submersible slurry lift pump provided by the present invention.

[0058] As shown in the figure, the submersible slurry booster pump in this example mainly includes a pump body, a suction port, and an outlet pipe assembly.

[0059] The pump body mainly includes a jetting device 1, a pump casing 4, an impeller 5, a skeleton seal 6, a bearing assembly 8, a protective pipe assembly, an overflow pipe device 11, a cooling flushing device 15, and a dynamic seal device 19.

[0060] The injection device 1 is located at the pump body inlet, which has a suction port 3. The suction port 3 is connected to the pump casing 4, and the pump casing 4 is connected to the impeller 5. The impeller 5 is connected to the skeleton seal 6 at its rear. The bearing assembly, including a sleeve bearing assembly 7 and a coupling bearing assembly 14, is mounted on the pump shaft 8. The coupling bearing assembly 14 is connected to the dynamic seal device 19 at its lower side. The pump shaft 8 has first protective pipes 9 on both sides and a second protective pipe 18 on the top. An overflow pipe assembly 11 connects the first protective pipes 9 and the second protective pipes 18. A cooling flushing device 15 connects the first protective pipes 9 and the outlet pipe assembly. The outlet pipe assembly includes an outlet short connector 16, an outlet pipe 20, and an outlet bend 21. The top of the pump body is connected to the motor 13 via a motor bracket 12. The middle and upper parts of the pump body are respectively provided with a pipe support device 10 and a support base 17 to support the pump body.

[0061] Among them, see Figure 2 The spraying device 1 includes a spraying assembly and a water inlet pipe 104. The water inlet pipe 104 is connected to an external water tank, and the spraying assembly is connected to the water inlet pipe 104. The spraying assembly includes a spray nozzle 101, a valve core 102, and a spring 103. The spring 103 is located inside the spray nozzle 101, and the valve core 102 is located inside the spring 103.

[0062] The injection device 1 introduces high-pressure fluid through the water inlet pipe 104. The fluid flows to the injection assembly, and the fluid pressure overcomes the resistance of the spring 103, pushing the valve core 102 open so that the fluid flows out from the injection nozzle 101 to the pump inlet. The injection device 1 flushes and agitates the introduced fluid. When the pump stops, the spring 103 returns to its original state, and the valve core 102 closes, thereby closing the injection nozzle 101 and preventing the slurry from clogging the injection device 1 when the pump stops.

[0063] Compared to the aeration and stirring devices used in existing submersible pumps, it has a simple structure, is safe and reliable in operation, and is not prone to clogging.

[0064] The suction inlet 3 is connected to the drain screen 2 at one end and to the pump casing 4 at the other end. The suction inlet 3 is a flared structure with different sizes at both ends; the larger end is connected to the drain screen 2, and the smaller end is connected to the pump casing 4.

[0065] See Figure 3 The filter screen 2 includes a filter structure 201 and a swirl prevention structure 202. The filter structure 201 is preferably constructed by rolling and welding steel plates with a mesh structure, and its mesh opening diameter is smaller than the diameter of solid particles in the pumped fluid. The swirl prevention structure 202 is connected to the inner side of the filter structure 201, and the swirl prevention structure 202 is preferably constructed of triangular steel plates.

[0066] The sludge rack 2 filters the fluid at the inlet and prevents air trapped in the swirling flow from entering the water pump through the suction port 3, thus avoiding cavitation in the water pump and effectively eliminating the swirling flow generated in the water tank during the water suction process.

[0067] See Figures 4a to 4cThe pump casing 4 includes a front pump casing 401, a volute casing 402, and a rear pump casing 403, forming the pressure-bearing assembly of the pump. The front pump casing 401 is provided with backflow blocking grooves 40101. In this example, the backflow blocking grooves 40101 are arc-shaped with a depth of 1 mm, and their number is coprime to the number of secondary blades 503 of the impeller 5. When the number of secondary blades 503 of the impeller 5 is the same as or has a greatest common divisor with the number of backflow blocking grooves 40101, a common harmonic frequency will be generated during operation. Accumulated vibrations at the same harmonic frequency will cause resonance. Setting the number of backflow blocking grooves 40101 and secondary blades 503 to be coprime avoids resonance and damage to the impeller 5.

[0068] The rear pump housing 403 is provided with a sand-proof groove 40301. The cross-section of the sand-proof groove 40301 is a near-acute triangle with a rounded apex angle, so that mud or other solid particles can fall off naturally under the action of gravity after accumulating in the sand-proof groove 40301, thereby preventing mud or other solid particles from entering the sleeve bearing device 7 and avoiding mud or other solid particles from entering the operating gap between the two, thereby improving the safety and reliability of operation.

[0069] The pump casing 4 is connected to the impeller 5 via the impeller locking component 23.

[0070] See Figures 5a to 5c The impeller 5 includes a back blade 501, a sand-blocking ring 502, and auxiliary blades 503. The back blade 501, sand-blocking ring 502, and auxiliary blades 503 are an integrated structure.

[0071] The back blade 501 is composed of spiral blades. In this example, there are 6 back blades 501, which are evenly distributed around the sand-blocking ring 502. The sand-blocking ring 502 has the same height as the back blade 501, and its cross-section is circular. Its diameter is larger than the diameter of the hub 506 of the impeller 5.

[0072] The back blade 501 is provided with a back blade balance groove 504, and the auxiliary blade 503 is provided with an auxiliary blade balance groove 504. The rotation of the back blade 501 does work on the pumped fluid, so that the rotating end of the back blade 501 forms a low-pressure side, which effectively balances the axial force. At the same time, the fluid on the high-pressure side of the back blade 501 will flow to the low-pressure side through the back blade balance groove 504, which will increase the pressure on the low-pressure side of the back blade 501 and prevent the formation of vortices. This effectively avoids unstable flow and blockage of the flow channel, thereby improving the pump efficiency.

[0073] Meanwhile, the rotation of the auxiliary blade 503 does work on the pumped fluid, reducing recirculation backflow. At the same time, the fluid on the high-pressure side of the working surface of the auxiliary blade 503 will flow to the low-pressure side on the back through the auxiliary blade balance groove 505, causing the pressure on the low-pressure side of the auxiliary blade 503 to rise, preventing the formation of vortices here, effectively avoiding unstable flow and blockage of the flow channel, thereby improving the pump efficiency.

[0074] During the rotation of impeller 5, a pressure difference is generated between the front and rear ends of the impeller, causing the fluid to flow back. The backflow blocking groove 40101 set in the front pump casing 401 and the auxiliary blade 503 set on the impeller 5 together form a backflow blocking device. The rotation of the auxiliary blade 503 drives the fluid to flow to the pump casing 4. The backflow blocking groove 40101 changes the direction of fluid flow and increases the backflow resistance, effectively blocking the fluid backflow.

[0075] The impeller 5, pump shaft 8, sleeve bearing 7, and coupling bearing assembly 14 constitute the rotor component. The sleeve bearing assembly 7 and coupling bearing assembly 14 form a bearing assembly mounted on the pump shaft 8. The impeller 5 hub 506 is connected to the rear side of the skeleton seal 6 to prevent impurities in the fluid from entering the sleeve bearing assembly 7.

[0076] See Figure 6 The sleeve bearing assembly 7 includes a bearing support 701, a guide bearing 702, and a flushing through hole 703. The bearing support 701, the guide bearing 702, and the flushing through hole 703 are integrally formed. The guide bearing 702 is connected to the inner side of the bearing support 701, and the flushing through hole 703 is located on both sides of the sleeve bearing assembly 7 to prevent impurities in the fluid from accumulating at the impeller hub 506.

[0077] After the high-pressure liquid cools and flushes the guide bearing 702, it flushes out the impurities accumulated in the hub 506 of the impeller 5 through the flushing hole 703, preventing mud or other solid particles from entering the operating gap of the guide bearing 702, thereby improving operational safety and reliability.

[0078] See Figure 7 The coupling includes a pump coupling 1401, a motor coupling 1402, a motor key 1403, a pump key 1404, a bearing body 1405, a positioning snap ring 1406, and a plum blossom body 1407.

[0079] The coupling bearing assembly 14 is connected to the pump shaft 8 via the pump key 1404. The pump coupling 1401 is connected to the motor coupling 1402 via the motor key 1403. A perforated body 1407 is provided between the pump coupling 1401 and the motor coupling 1402 to buffer and dampen the coupling bearing assembly 14. The roller bearing 1408 is positioned between the bearing body 1405 and the pump coupling 1401 via a locating retainer 1406.

[0080] The coupling bearing assembly 14 integrates the coupling and the roller bearing 1408 into one unit. Compared with the split design used in existing submersible pumps, it has a compact structure, significantly reduces the pump shaft length and the number of parts, and is easy to install and reliable in operation.

[0081] A dynamic seal device 19 is provided on the lower side of the coupling bearing assembly 14. Compared with the mechanical seal structure used in existing submersible pumps, it adopts a non-contact sealing form and a two-stage auxiliary impeller structure, which is reliable in operation, compact in structure, and has no wear and loss of components, greatly improving the reliability of operation and the efficiency of pump operation.

[0082] See Figure 8 The dynamic sealing device 19 includes a primary auxiliary impeller 1901, a primary sealing box 1902, a secondary auxiliary impeller 1903, a secondary sealing box 1904, a transmission key 1905, a locking nut 1906, and a liquid-throwing ring 1907.

[0083] The primary auxiliary impeller 1901 is located at the bottom of the dynamic sealing device 19, and a primary sealing box 1902 is mounted on it. The inner side of the primary auxiliary impeller 1901 is connected to the secondary auxiliary impeller 1903, and a secondary sealing box 1904 is mounted on the secondary auxiliary impeller 1903. The top of the dynamic sealing device 19 is connected to the sling ring 1907 via a locking nut 1906, and is connected to the pump shaft 8 via a transmission key 1905, allowing it to rotate with the pump shaft 8.

[0084] When the pump is working, the fluid in the primary auxiliary impeller 1901 and the secondary auxiliary impeller 1903 will also rotate with the pump shaft 8. The rotating fluid will generate an outward centrifugal force, which will resist the liquid flowing towards the end of the pump shaft 8 and reduce the pressure at the seal.

[0085] At the same time, the liquid ejector ring 1907 can effectively protect the roller bearing 1408 by using the centrifugal force generated by its rotation to lock the primary impeller 1901 and the secondary impeller 1903 while locking them.

[0086] Compared to the mechanical seal structure used in existing submersible pumps, the dynamic seal device 19 adopts a two-stage auxiliary impeller structure, which is reliable in operation, compact in structure, and has no wear and loss of components, greatly improving operational reliability and pump operating efficiency.

[0087] The pump shaft 8 is provided with vertical first protective pipes 9 on both sides. The first protective pipe 9 is provided with a discharge ball valve 22 for adjusting the flow rate. The first protective pipe 9 is connected to the sleeve bearing device 7. The pump shaft 8 is provided with a horizontal second protective pipe 18 on the upper part. The second protective pipe 18 is connected to the first protective pipe 9.

[0088] See Figure 1 and Figure 9 The overflow pipe device 11 includes a pipe assembly 1101 and a liquid collector 1102. One end of the pipe assembly 1101 is connected to the first protective pipe 9, and the other end is connected to the second protective pipe 18. The pipe assembly 1101 is equipped with a liquid collector 1102, which is connected to the water tank to prevent the fluid in the first protective pipe 9 from overflowing and damaging the bearing assembly.

[0089] One end of the cooling flushing device 15 is connected to the outlet short circuit 16, and the other end is connected to the first protective pipe 9. After being filtered by the cooling flushing device 15, the cooling flushing water passes through the flushing through hole 703 provided on the sleeve bearing device 7 to cool and flush the sleeve bearing device 7.

[0090] The cooling and flushing device 15 filters the outlet liquid and then cools and flushes the sleeve bearing assembly 7. Compared with the immersion bearing used in existing submersible pumps, it effectively avoids the problem of faster wear and shorter lifespan of bearing components when the fluid contains solid particles, and greatly improves operational reliability.

[0091] The outlet water level of the overflow pipe device 11 is lower than the inlet water level of the cooling flushing device 15, so that after the cooling flushing water in the cooling flushing device 15 flows into the first protective pipe 9 to flush the sleeve bearing device 7, when the water level of the cooling flushing water in the first protective pipe 9 is higher than the height of the connection between the overflow pipe device 11 and the first protective pipe 9, the cooling flushing water can flow into the water tank through the overflow pipe device 11, thus preventing the water level from rising continuously and damaging the bearing assembly.

[0092] Compared to existing submersible pumps that lack any fault protection measures and cannot be promptly eliminated or maintained, this invention avoids this problem by using a structure where the outlet water level of the overflow pipe device 11 is lower than the inlet water level of the cooling flushing device 15. This significantly reduces operating and maintenance costs and effectively increases operational safety and reliability.

[0093] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A submersible slurry lifting pump, comprising a pump body, the pump body including a suction inlet (3), a pump casing (4), a pump shaft (8), an impeller (5), an outlet pipe (20), a first protective pipe (9), and a second protective pipe (18), wherein the bottom of the pump casing (4) is connected to the suction inlet (3), and one side is connected to the outlet pipe (20), the impeller (5) is disposed inside the pump casing (4), the pump shaft (8) is provided with first protective pipes (9) on both sides, and a second protective pipe (18) is provided at the top, characterized in that, Also includes: The jetting device (1) is installed at the inlet of the pump body to flush and agitate the fluid at the inlet of the pump body. The pressure-bearing component is disposed on the pump casing (4) and includes a backflow blocking groove (40101) to prevent the fluid from flowing back and a sand-proof groove (40301) to prevent impurities from accumulating. A sleeve bearing assembly (7) is disposed on the pump shaft (8) and includes a flushing through hole (703) to prevent the accumulation of impurities in the fluid. A skeleton seal (6) is provided on the impeller (5) to seal the sleeve bearing device (7). A coupling bearing assembly (14) is mounted on the pump shaft (8) of the pump body, comprising an integrated coupling and roller bearings. A dynamic sealing device (19) is disposed on the lower side of the coupling bearing assembly (14), and includes a water-throwing structure for sealing the coupling bearing assembly (14). A cooling and rinsing device (15) is provided, with one end connected to the outlet pipe (20) and the other end connected to the first protective pipe (9) connected to the sleeve bearing device (7), for cooling and rinsing the sleeve bearing device (7). An overflow pipe device (11) is provided, with one end connected to the first protective pipe (9) and the other end connected to the second protective pipe (18). The overflow pipe device (11) is connected to the water tank through a liquid collector (1102) provided on the overflow pipe device (11). The outlet water level of the overflow pipe device (11) is lower than the inlet water level of the cooling flushing device (15). It also includes a baffle (2), which is connected to the suction port (3) and is used to filter the fluid drawn in and prevent air from entering the pump body; The sludge rack (2) includes a filter structure (201) and a swirl prevention structure (202); the filter structure (201) is made of steel plate with a mesh structure rolled and welded, and its mesh diameter is smaller than the diameter of solid particles in the pumped fluid; the swirl prevention structure (202) is connected to the inner side of the filter structure (201), and the swirl prevention structure (202) is made of triangular steel plate; The impeller (5) includes a back blade (501), a sand-blocking ring (502) and an auxiliary blade (503). The back blade (501), the sand-blocking ring (502) and the auxiliary blade (503) are an integrated structure. The back blade (501) and the auxiliary blade (503) are provided with balance grooves. The coupling includes a pump coupling (1401), a motor coupling (1402), a motor key (1403), a pump key (1404), a bearing body (1405), a locating snap ring (1406), and a plum blossom body (1407). The coupling bearing device (14) is connected to the pump shaft (8) via a pump key, and the pump coupling (1401) is connected to the motor coupling (1402) via a motor key (1403). A plum blossom body (1407) is provided between the pump coupling (1401) and the motor coupling (1402) to buffer and reduce vibration of the coupling bearing device (14); the roller bearing (1408) is set between the bearing body (1405) and the pump coupling (1401) via a positioning snap ring (1406); The coupling bearing assembly (14) integrates the coupling and the roller bearing (1408) into one unit; The lower side of the coupling bearing assembly (14) is provided with a dynamic sealing device (19), which includes a primary auxiliary impeller (1901), a primary sealing box (1902), a secondary auxiliary impeller (1903), a secondary sealing box (1904), a transmission key (1905), a locking nut (1906), and a liquid ejection ring (1907). The primary impeller (1901) is located at the bottom of the dynamic sealing device (19), and a primary sealing box (1902) is provided on it. The inner side of the primary impeller (1901) is connected to the secondary impeller (1903), and a secondary sealing box (1904) is provided on the secondary impeller (1903). The top of the dynamic sealing device (19) is connected to the liquid throwing ring (1907) through the locking nut (1906), and is connected to the pump shaft (8) through the transmission key (1905), and can rotate with the pump shaft (8).

2. The submersible slurry booster pump according to claim 1, characterized in that, The suction port (3) is a flared structure with different sizes at both ends. The larger end of the suction port (3) is connected to the baffle (2), and the smaller end is connected to the pump casing (4).

3. The submersible slurry booster pump according to claim 1, characterized in that, The spraying device (1) includes a spray nozzle (101), a valve core (102), a spring (103) and a water inlet pipe (104). The spray nozzle (101) is connected to the water inlet pipe (104). The valve core (102) and the spring (103) are provided inside the spray nozzle (101).

4. The submersible slurry lift pump according to claim 1, characterized in that, The pump casing (4) includes a front pump casing (401), a volute casing (402) and a rear pump casing (403). The backflow blocking groove (40101) is provided on the front pump casing (401), and its number is a prime number relative to the number of the back blades (501) of the impeller (5).

5. The submersible slurry booster pump according to claim 4, characterized in that, The rear pump housing (403) has several annular anti-sand grooves (40301) on its end face, and the anti-sand grooves (40301) and the rear pump housing (403) are an integral structure.

6. The submersible slurry booster pump according to claim 1, characterized in that, The sand-blocking ring (502) has a circular structure, and the back blades (501) are evenly distributed on the circumference of the sand-blocking ring (502), with a diameter larger than the cross-sectional diameter of the sand-blocking ring.

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