Well submersible pump not prone to clogging

Abstract

The application discloses a well submersible pump which is not prone to blockage and belongs to the technical field of submersible pumps, and comprises, from top to bottom along the axial direction, a water outlet assembly, a pump body assembly, a water inlet connecting assembly, a motor assembly and a supporting and sealing assembly. An electrical assembly is arranged on one side of the pump body assembly, and the pump body assembly and the motor assembly are sealingly connected through the water inlet connecting assembly. The pump body assembly comprises a pump cylinder and a pump shaft, the pump shaft is installed in the pump cylinder, a rubber bearing is installed at one end of the pump shaft close to the water outlet assembly, the other end of the pump shaft is connected with the motor assembly, and a plurality of groups of impellers, guide vanes and cover plates are alternately installed on the pump shaft. The motor assembly comprises a machine cylinder, an upper bearing seat, a rotor and a lower bearing seat are sequentially installed in the machine cylinder from top to bottom, a rotating shaft is fixedly connected with the pump shaft, and a stator embedded wire is arranged on the rotor. The application discloses a well submersible pump which is not prone to blockage, has good wear resistance and reliable sealing.

Description

Technical Field

[0001] This invention relates to the field of submersible pump technology, and in particular to a well submersible pump that is not easily clogged. Background Technology

[0002] Submersible well pumps are devices that are immersed in water wells or deep wells to extract groundwater, and are widely used in agricultural irrigation, industrial water supply, and residential water use. Traditional submersible well pumps have the following technical challenges in practical use: 1. The water inlet is prone to clogging: Most existing pumps have end openings or single-sided openings for water inlet. The flow channel is easily entangled and deposited by sand, fibers, aquatic plants and other debris in the well water, which can lead to poor water intake or even shutdown, resulting in high maintenance costs. 2. Key components are prone to wear: After sand particles enter the pump body, they can easily wear down the impeller, guide vanes and shaft, shortening the service life of the equipment.

[0003] Therefore, there is an urgent need for a submersible pump for wells that is not prone to clogging, has good wear resistance, and provides reliable sealing to solve the above problems. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a well submersible pump that is not easy to clog, has good wear resistance and reliable sealing.

[0005] To achieve this objective, the present invention adopts the following technical solution: The present invention provides a submersible pump for wells that is not prone to clogging, comprising a water outlet assembly, a pump body assembly, a water inlet connection assembly, a motor assembly and a support and sealing assembly assembled sequentially from top to bottom along the axial direction. An electrical assembly is provided on one side of the pump body assembly, and the pump body assembly and the motor assembly are sealed and connected through the water inlet connection assembly. The pump body assembly includes a pump barrel and a pump shaft. The pump shaft is installed in the pump barrel. A rubber bearing is installed at one end of the pump shaft near the water outlet assembly, and the other end is connected to the motor assembly. Several sets of impellers, guide vanes and cover plates are alternately installed on the pump shaft in sequence. The guide vanes are installed inside the impeller below. The cover plate abuts against the bottom of the impeller. An upper cover is installed between the impeller and the rubber bearing at the top. The motor assembly includes a barrel, inside which an upper bearing seat, a rotor, and a lower bearing seat are installed sequentially from top to bottom. The upper and lower bearing seats are both mounted on the rotor shaft via bearings. The rotor shaft is fixedly connected to the pump shaft. The rotor is provided with stator windings.

[0006] A preferred embodiment of the present invention is that a coupling pump body and a coupling motor are provided between the pump shaft and the rotating shaft, and a skeleton oil seal and a mechanical seal are sequentially provided at the end of the rotating shaft near the coupling motor.

[0007] A preferred embodiment of the present invention is that the water outlet assembly includes a water outlet installed on the pump cylinder, a water outlet end cap screwed onto the water outlet, a stepped surface provided at one end of the water outlet and the pump cylinder, and O-rings provided between the end face of the stepped surface and the pump cylinder, as well as between the bottom of the water outlet and the cover plate.

[0008] A preferred embodiment of the present invention is that the water inlet connection assembly includes a connection structure, a mesh cover, a copper sleeve, and an abacus bead sheath. The connection structure is sealed between the pump body assembly and the motor assembly. The mesh cover is installed on the outer wall of the connection structure and wraps around the connection section between the lower end of the pump cylinder and the upper end of the motor assembly to form a circumferential water inlet anti-clogging structure. The copper sleeve and the abacus bead sheath are sequentially fitted onto the connection ends of the electrical assembly and the motor assembly from top to bottom.

[0009] A preferred embodiment of the present invention is that the supporting sealing assembly includes an oil bladder and a base. The base is fixed to the bottom end face of the lower bearing seat by a cross-groove pan head screw. The oil bladder is installed in the concave surface of the bottom of the lower bearing seat and is adapted to the bottom of the lower bearing seat. The lower end face of the oil bladder abuts against the base.

[0010] A preferred embodiment of the present invention is that the electrical component includes a heat shrink tubing installed on the pump barrel, a cable installed inside the heat shrink tubing, the cable passing through the heat shrink tubing and into the machine barrel to be electrically connected to the stator winding, and a pressure plate is provided on one side of the cable.

[0011] The preferred technical solution of the present invention is that the impeller and guide vane are made of PS material and are alternately fitted on the pump shaft, and the pump barrel is made of SUS304 material with a smooth inner wall transition, reducing the risk of particle wear and deposition.

[0012] The preferred technical solution of the present invention is that the mesh cover is a porous streamlined structure made of 2Cr13 / SUS304 material, and has water inlet holes evenly opened around the circumference. Water flows through the mesh cover and enters the pump cylinder from the circumference. The flow channel has no dead corners and no obstruction, avoiding fiber entanglement and particle deposition blockage. The copper sleeve is made of ZCuZn38 brass and is fitted on the connection section between the pump shaft and the rotating shaft. It cooperates with the abacus bead sleeve to form a wear-resistant protective structure for the water inlet section, reducing the wear of sand particles on the rotating shaft.

[0013] The preferred technical solution of the present invention is that the oil bladder is made of nitrile rubber and is linked with the mechanical seal to prevent sand and water from entering the motor cavity.

[0014] A preferred embodiment of the present invention is that a retaining ring is provided between the connecting structure and the pump barrel, the machine barrel, and between the machine barrel and the lower bearing seat.

[0015] The beneficial effects of this invention are as follows: This invention has a significant anti-clogging effect: it adopts a circumferentially porous streamlined mesh inlet structure, with no dead corners or obstructions in the flow channel, effectively avoiding fiber entanglement and sand deposition, and solving the problem of easy clogging at the end / single side of the traditional pump body inlet; This invention has excellent wear resistance: the impeller and guide vanes are made of PS material, the pump cylinder is made of SUS304 stainless steel, and the shaft connection section is equipped with a brass sleeve and an abacus bead sleeve, which reduces the wear of sand particles on key components from multiple dimensions and extends the service life of the equipment. The invention provides reliable sealing protection: the linkage sealing structure of mechanical seal, skeleton oil seal and nitrile rubber oil bladder effectively prevents sand and water from entering the motor cavity and avoids damage to the stator and rotor; the connection between the water outlet and the pump body adopts double sealing with O-rings to improve the overall sealing performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the submersible pump structure provided in a specific embodiment of the present invention; Figure 2 This is a cross-sectional view of the submersible pump structure provided in a specific embodiment of the present invention; Figure 3 This is provided in a specific embodiment of the present invention. Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0017] The attached diagram lists the components represented by each number as follows: 1. Pump body assembly; 2. Outlet assembly; 3. Motor assembly; 4. Inlet connection assembly; 5. Support and sealing assembly; 6. Electrical assembly; 8. Connection structure; 10. Top cover; 11. Pump barrel; 12. Pump shaft; 13. Impeller; 14. Guide vane; 15. Rubber bearing; 16. Cover plate; 17. Snap ring; 18. Coupling pump body; 19. Coupling motor; 21. Outlet; 22. Outlet end cover; 23. O-ring; 31. Barrel; 32. Upper bearing housing; 33. Mechanical seal; 34. Skeleton oil seal; 35. Bearing; 36. Rotor; 37. Stator winding; 38. Lower bearing housing; 41. Mesh cover; 42. Copper sleeve; 43. Abacus bead sheath; 51. Oil bladder; 52. Base; 53. Cross-groove pan head screw; 61. Heat shrink tubing; 62. Cable; 63. Pressure plate. Detailed Implementation

[0018] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1 As attached Figure 1-3As shown, a submersible pump for wells that is not prone to clogging includes a water outlet assembly 2, a pump body assembly 1, a water inlet connection assembly 4, a motor assembly 3, and a support and sealing assembly 5, which are assembled sequentially from top to bottom along the axial direction. An electrical assembly 6 is provided on one side of the pump body assembly 1, and the pump body assembly 1 and the motor assembly 3 are sealed and connected through the water inlet connection assembly 4. The pump body assembly 1 includes a pump barrel 11 and a pump shaft 12. The pump shaft 12 is installed in the pump barrel 11. A rubber bearing 15 is installed at one end of the pump shaft 12 near the water outlet assembly 2, and the other end is connected to the motor assembly 3. Several sets of impellers 13, guide vanes 14 and cover plates 16 are sequentially and alternately installed on the pump shaft 12. The guide vanes 14 are installed inside the impellers 13 below. The cover plate 16 abuts against the bottom of the impellers 13. An upper cover 10 is installed between the impellers 13 and the rubber bearings 15 at the top. The motor assembly 3 includes a barrel 31. Inside the barrel 31, an upper bearing seat 32, a rotor 36, and a lower bearing seat 38 are installed sequentially from top to bottom. The upper bearing seat 32 and the lower bearing seat 38 are both mounted on the rotating shaft of the rotor 36 via bearings 35. The rotating shaft is fixedly connected to the pump shaft 12. The rotor 36 is provided with stator windings 37.

[0020] This embodiment adopts an axially modular coaxial assembly structure, resulting in a well-organized overall structure and high coaxiality. When the equipment is powered on, the stator windings 37 on the rotor 36 generate a magnetic field, driving the rotor 36 and shaft to rotate at high speed. The shaft drives the pump shaft 12 to rotate synchronously, causing the multi-stage impellers 13 on the pump shaft 12 to operate synchronously. The high-speed rotation of the impellers 13 generates centrifugal negative pressure, drawing external well water into the pump casing 11. The water flow is guided, stabilized, and pressurized step-by-step by the guide vanes 14 nested below the impellers 13, achieving a step-by-step lifting and transport of the water. The drainage operation is finally completed through the water outlet assembly 2. During operation, the rubber bearing 15 at the top of the pump shaft 12 and the bearing 35 of the upper bearing seat 32 and lower bearing seat 38 inside the motor form a double-point support structure, which centers and limits the pump shaft 12 and the rotating shaft. Together with the cover plate 16 at the bottom of the impeller 13 and the top cover 10, the axial fixation of the impeller 13 and the top sealing isolation are achieved, which effectively ensures the stability of the pump shaft 12 and the impeller 13 when running at high speed, reduces the shaking and vibration of the equipment during operation, and ensures the continuous and stable operation of water conveyance.

[0021] The axially arranged components of the water outlet assembly 2, pump body assembly 1, water inlet connection assembly 4, motor assembly 3, and support and sealing assembly 5 create a compact overall structure that is easy to assemble and disassemble, and highly versatile. Meanwhile, the pump barrel 11, pump shaft 12, multi-stage impeller 13, and guide vanes 14 work together to form a complete multi-stage pressurized water delivery channel, effectively ensuring the water pump's basic water delivery efficiency. The double-bearing support structure significantly improves the concentricity of the pump shaft 12 and the rotating shaft, reducing swaying, noise, and wear during high-speed operation. The sealed connection between the pump body assembly 1 and the motor assembly 3 via the water inlet connection assembly 4 effectively avoids water leakage problems in the overall structure, laying a solid structural foundation for the equipment's anti-clogging, anti-water ingress, and stable long-term operation, making it suitable for conventional well water delivery conditions.

[0022] Example 2 As attached Figure 1-3 As shown, a submersible pump for wells that is not prone to clogging includes a water outlet assembly 2, a pump body assembly 1, a water inlet connection assembly 4, a motor assembly 3, and a support and sealing assembly 5, which are assembled sequentially from top to bottom along the axial direction. An electrical assembly 6 is provided on one side of the pump body assembly 1, and the pump body assembly 1 and the motor assembly 3 are sealed and connected through the water inlet connection assembly 4. The pump body assembly 1 includes a pump barrel 11 and a pump shaft 12. The pump shaft 12 is installed in the pump barrel 11. A rubber bearing 15 is installed at one end of the pump shaft 12 near the water outlet assembly 2, and the other end is connected to the motor assembly 3. Several sets of impellers 13, guide vanes 14 and cover plates 16 are sequentially and alternately installed on the pump shaft 12. The guide vanes 14 are installed inside the impellers 13 below. The cover plate 16 abuts against the bottom of the impellers 13. An upper cover 10 is installed between the impellers 13 and the rubber bearings 15 at the top. The motor assembly 3 includes a barrel 31. Inside the barrel 31, an upper bearing seat 32, a rotor 36, and a lower bearing seat 38 are installed sequentially from top to bottom. The upper bearing seat 32 and the lower bearing seat 38 are both mounted on the rotating shaft of the rotor 36 via bearings 35. The rotating shaft is fixedly connected to the pump shaft 12. The rotor 36 is provided with stator windings 37.

[0023] As a possible implementation of this solution, preferably, a coupling pump body 18 and a coupling motor 19 are provided between the pump shaft 12 and the rotating shaft, and a skeleton oil seal 34 and a mechanical seal 33 are sequentially provided on the end of the rotating shaft near the coupling motor 19.

[0024] As a possible implementation of this solution, preferably, the water outlet assembly 2 includes a water outlet 21 installed on the pump cylinder 11, a water outlet end cap 22 screwed onto the water outlet 21, a stepped surface provided at one end of the water outlet 21 and the pump cylinder 11, and O-rings 23 are provided between the end face of the stepped surface and the pump cylinder 11, as well as between the bottom of the water outlet 21 and the cover plate 16.

[0025] As a possible implementation of this solution, preferably, the support sealing assembly 5 includes an oil bladder 51 and a base 52. The base 52 is fixed to the bottom end face of the lower bearing seat 38 by a cross-groove pan head screw 53. The oil bladder 51 is installed in the concave surface of the bottom of the lower bearing seat 38 and is adapted to the bottom of the lower bearing seat 38. The lower end face of the oil bladder 51 abuts against the base 52.

[0026] As a possible implementation of this solution, preferably, the electrical component 6 includes a heat shrink tubing 61 installed on the pump barrel 11, a cable 62 installed inside the heat shrink tubing 61, the cable 62 passing through the heat shrink tubing 61 and entering the machine barrel 31 to be electrically connected to the stator winding 37, and a pressure plate 63 is provided on one side of the cable 62.

[0027] In this embodiment, the pump shaft 12 and the rotating shaft are precisely connected and transmitted through the coupling pump body 18 and the coupling motor 19, ensuring the coaxiality and stability of power transmission. The skeleton oil seal 34 and the mechanical seal 33 at the end of the rotating shaft form a double rotary sealing structure, which can effectively prevent water and fine sand particles from entering the inside of the barrel 31 along the gaps in the rotating shaft. The water outlet assembly 2 is precisely positioned by relying on the stepped surface of the water outlet 21. The two O-rings 23 respectively achieve radial and axial double static seals, sealing the leakage gaps in the high-pressure water conveyance stage of the pump barrel 11 and preventing water pressure loss and water leakage. In the bottom support sealing assembly 5, the oil bladder 51 is embedded Installed on the concave surface of the lower bearing seat 38 and fitted and limited by the base 52, it can adaptively deform elastically according to the pressure and temperature changes in the inner cavity of the barrel 31. Together with the mechanical seal 33 and the skeleton oil seal 34 at the rotating shaft, it forms an all-round sealing system with upper and lower linkage, effectively preventing sand and water from entering the motor cavity. The electrical component 6 provides overall waterproof and insulating protection for the cable 62 through the heat shrink tubing 61, and fixes and limits the cable 62 with the wire clamping plate 63 to avoid the cable shaking, pulling, and wear during long-term underwater operation of the water pump, and prevents short circuits and power outages caused by loose wiring and insulation damage, thus ensuring the stable power supply operation of the equipment's electrical system.

[0028] This embodiment integrates multiple optimized structures including transmission sealing, outlet sealing, bottom sealing, and electrical protection. The mating structure between the coupling pump body 18 and the coupling motor 19 effectively improves the power transmission accuracy and efficiency between the pump shaft 12 and the rotating shaft, eliminating component wear caused by transmission misalignment. The skeleton oil seal 34, in conjunction with the mechanical seal 33, achieves dynamic sealing of the rotating shaft. Combined with the adaptive linkage sealing structure of the oil bladder 51, it comprehensively prevents sand and water from entering the inner cavity of the barrel 31, solving the problems of easy water ingress and burnout of traditional submersible pump motors. The outlet 21 is stepped. The ladder positioning structure and double O-ring 23 sealing design significantly improve the sealing performance of the pump cylinder 11 outlet, avoiding high-pressure water leakage and water pressure loss, and effectively improving water delivery efficiency. At the same time, the heat shrink tubing 61 insulation protection and the wire clamping plate 63 fixing structure greatly improve the stability and safety of the underwater electrical connection of the cable 62, effectively avoiding cable corrosion, pulling, short circuit and other faults, significantly extending the service life of electrical components 6 and the whole machine, and adapting to the conventional downhole working conditions of humid, watery and slightly sandy conditions. Its operational stability and protection are far superior to the foundation structure.

[0029] Example 3 As attached Figure 1-3 As shown, a submersible pump for wells that is not prone to clogging includes a water outlet assembly 2, a pump body assembly 1, a water inlet connection assembly 4, a motor assembly 3, and a support and sealing assembly 5, which are assembled sequentially from top to bottom along the axial direction. An electrical assembly 6 is provided on one side of the pump body assembly 1, and the pump body assembly 1 and the motor assembly 3 are sealed and connected through the water inlet connection assembly 4. The pump body assembly 1 includes a pump barrel 11 and a pump shaft 12. The pump shaft 12 is installed in the pump barrel 11. A rubber bearing 15 is installed at one end of the pump shaft 12 near the water outlet assembly 2, and the other end is connected to the motor assembly 3. Several sets of impellers 13, guide vanes 14 and cover plates 16 are sequentially and alternately installed on the pump shaft 12. The guide vanes 14 are installed inside the impellers 13 below. The cover plate 16 abuts against the bottom of the impellers 13. An upper cover 10 is installed between the impellers 13 and the rubber bearings 15 at the top. The motor assembly 3 includes a barrel 31. Inside the barrel 31, an upper bearing seat 32, a rotor 36, and a lower bearing seat 38 are installed sequentially from top to bottom. The upper bearing seat 32 and the lower bearing seat 38 are both mounted on the rotating shaft of the rotor 36 via bearings 35. The rotating shaft is fixedly connected to the pump shaft 12. The rotor 36 is provided with stator windings 37.

[0030] As a possible implementation of this solution, preferably, the water inlet connection assembly 4 includes a connection structure 8, a mesh cover 41, a copper sleeve 42, and an abacus bead sheath 43. The connection structure 8 is sealed between the pump body assembly 1 and the motor assembly 3. The mesh cover 41 is installed on the outer wall of the connection structure 8 and wraps around the connection section between the lower end of the pump cylinder 11 and the upper end of the motor assembly 3 to form a circumferential water inlet anti-clogging structure. The copper sleeve 42 and the abacus bead sheath 43 are sequentially fitted from top to bottom onto the connection end of the electrical assembly 6 and the motor assembly 3.

[0031] As a possible implementation of this solution, preferably, the impeller 13 and guide vane 14 are made of PS material and are alternately fitted on the pump shaft 12, and the pump barrel 11 is made of SUS304 material with a smooth inner wall transition to reduce the risk of particle wear and deposition.

[0032] As one possible implementation of this solution, preferably, the mesh cover 41 is a porous streamlined structure made of 2Cr13 / SUS304 material, with water inlet holes evenly opened around the circumference. Water flows through the mesh cover 41 and enters the pump cylinder 11 around the circumference, with no dead corners or obstructions in the flow channel, avoiding fiber entanglement and particle deposition blockage; the copper sleeve is made of 42ZCuZn38 brass material, and is fitted on the connection section between the pump shaft 12 and the rotating shaft, cooperating with the abacus bead sleeve 43 to form a wear-resistant protective structure for the water inlet section, reducing the wear of sand particles on the rotating shaft.

[0033] As a possible implementation of this solution, preferably, the oil bladder 51 is made of nitrile rubber and is linked with the mechanical seal 33 to seal and prevent sand and water from entering the motor cavity.

[0034] As a possible implementation of this solution, preferably, a retaining ring 17 is provided between the connecting structure 8 and the pump cylinder 11, the machine cylinder 31, and between the machine cylinder 31 and the lower bearing seat 38.

[0035] This embodiment achieves multiple optimizations in terms of anti-clogging, wear resistance, and anti-loosening by improving the water inlet structure, adding a retaining spring 17 for limiting the position, and optimizing the component materials and wear-resistant protection system. During operation, well water enters the pump cylinder 11 uniformly from all directions through a 360-degree circularly arranged streamlined porous mesh 41. The mesh 41 can intercept aquatic plants, fibers, and large particles in advance. The streamlined, dead-angle-free flow channel avoids debris entanglement and particle accumulation, solving the clogging problem from the water source. The PS material impeller 13 and guide vanes 14 are suitable for long-term underwater operation and possess excellent corrosion resistance and impact resistance. The SUS304 stainless steel pump cylinder 11 has a smooth, stepless inner wall, significantly reducing the probability of fine sand particles adhering, depositing, and eroding. The retaining spring 17 secures the connection between the connecting structure 8 and the pump cylinder 11 and the machine cylinder 31. Radial limiting and fixing, while using snap ring 17 to lock the assembly position of barrel 31 and lower bearing seat 38, effectively avoids the problems of loosening, displacement and misalignment of various connecting parts under long-term high-speed vibration and water flow impact, ensuring the assembly accuracy and structural sealing of the whole machine; the nitrile rubber oil bladder 51 has excellent elasticity, water resistance and aging resistance, and can accurately cooperate with mechanical seal 33 to form a linkage sealing system, further strengthening the sealing and water-proofing ability of barrel 31 cavity; ZCuZn38 brass sleeve 42 and abacus bead sleeve 43 cooperate to cover the outside of the connection section between pump shaft 12 and rotating shaft, forming a stable wear-resistant protective layer under the condition of continuous scouring of sand-containing water flow, effectively buffering the abrasive force of sand particles, avoiding the pump shaft 12, rotating shaft and connecting structure 8 from being worn by sand particles, ensuring the equipment to continuously and stably transport water under harsh water quality.

[0036] This embodiment specifically optimizes the core performance of the water pump in terms of anti-clogging, wear resistance, corrosion resistance, and anti-loosening. The circumferentially porous streamlined mesh cover 41 completely changes the defects of traditional end-inlet water that is prone to accumulation, entanglement, and clogging, achieving water inlet without dead angles and automatic flow guidance to prevent sedimentation. It solves the industry pain points of aquatic plant fiber entanglement and particle blockage. The combination of the SUS304 smooth pump barrel 11 with the PS material impeller 13 and guide vane 14 significantly improves the corrosion resistance and wear resistance of the pump body flow parts, reduces particle deposition and adhesion, and continuously reduces the probability of clogging. The 2Cr13 / SUS304 material mesh cover 41 has high structural strength, corrosion resistance, and is not easily deformed. It can stably maintain the anti-clogging filtration effect during long-term operation. The retaining ring 17 provides bidirectional limiting and locking for the connecting structure 8, pump barrel 11, machine barrel 31, and machine barrel 31 and lower bearing seat 38, effectively resisting equipment operation. The vibration and high-pressure water flow impact cause component movement and loosening, significantly improving the overall assembly firmness and structural stability. It ensures precise alignment of each sealing and transmission structure, avoiding problems such as seal failure, abnormal noise, and accelerated wear caused by component misalignment. The linkage sealing structure of nitrile rubber oil bladder 51 and mechanical seal 33 is suitable for complex underwater environments, with strong sealing reliability and effectively reducing fine sand seepage. Combined with the wear-resistant protective structure composed of ZCuZn38 brass sleeve 42 and abacus bead sheath 43, it forms all-round protection for the core transmission connection between pump shaft 12 and rotating shaft, greatly improving the equipment's sand abrasion resistance and effectively extending the service life of the equipment in harsh underground working conditions with high sand content and many impurities. It is suitable for complex working conditions such as deep wells in farmland, sandy water sources, and river water intake. Its comprehensive anti-clogging, wear resistance, anti-loosening performance and operational stability are superior to traditional submersible pumps.

[0037] This invention has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. This invention is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims are also within the protection scope of this invention.

Claims

1. A submersible pump for wells that is not easily clogged, characterized in that: It includes a water outlet assembly (2), a pump body assembly (1), a water inlet connection assembly (4), a motor assembly (3), and a support and sealing assembly (5) assembled sequentially from top to bottom along the axial direction. An electrical assembly (6) is provided on one side of the pump body assembly (1). The pump body assembly (1) and the motor assembly (3) are sealed and connected by the water inlet connection assembly (4). The pump body assembly (1) includes a pump barrel (11) and a pump shaft (12). The pump shaft (12) is installed in the pump barrel (11). A rubber bearing (15) is installed at one end of the pump shaft (12) near the water outlet assembly (2), and the other end is connected to the motor assembly (3). Several sets of impellers (13), guide vanes (14) and cover plates (16) are installed alternately on the pump shaft (12). The guide vanes (14) are installed inside the impeller (13) below. The cover plate (16) abuts against the bottom of the impeller (13). A top cover (10) is installed between the top of the impeller (13) and the rubber bearing (15). The motor assembly (3) includes a barrel (31). Inside the barrel (31), an upper bearing seat (32), a rotor (36), and a lower bearing seat (38) are installed sequentially from top to bottom. The upper bearing seat (32) and the lower bearing seat (38) are both mounted on the rotating shaft of the rotor (36) through bearings (35). The rotating shaft is fixedly connected to the pump shaft (12). The rotor (36) is provided with stator windings (37).

2. A submersible pump for wells that is not prone to clogging according to claim 1, characterized in that: A coupling pump body (18) and a coupling motor (19) are provided between the pump shaft (12) and the rotating shaft. A skeleton oil seal (34) and a mechanical seal (33) are sequentially provided on the end of the rotating shaft near the coupling motor (19).

3. A submersible pump for wells that is not prone to clogging according to claim 1, characterized in that: The water outlet assembly (2) includes a water outlet (21) installed on the pump cylinder (11). A water outlet end cap (22) is screwed onto the water outlet (21). A stepped surface is provided at one end of the water outlet (21) and the pump cylinder (11). An O-ring (23) is provided between the end face of the stepped surface and the pump cylinder (11), as well as between the bottom of the water outlet (21) and the cover plate (16).

4. A submersible well pump that is not easily clogged according to claim 1, characterized in that: The water inlet connection assembly (4) includes a connection structure (8), a mesh cover (41), a copper sleeve (42), and an abacus bead sheath (43). The connection structure (8) is sealed between the pump body assembly (1) and the motor assembly (3). The mesh cover (41) is installed on the outer wall of the connection structure (8) and wraps around the connection section between the lower end of the pump cylinder (11) and the upper end of the motor assembly (3) to form a circumferential water inlet anti-clogging structure. The copper sleeve (42) and the abacus bead sheath (43) are sequentially fitted from top to bottom onto the connection end of the electrical assembly (6) and the motor assembly (3).

5. A submersible well pump that is not easily clogged according to claim 1, characterized in that: The support sealing assembly (5) includes an oil bladder (51) and a base (52). The base (52) is fixed to the bottom end face of the lower bearing seat (38) by a cross-groove pan head screw (53). The oil bladder (51) is installed in the concave surface at the bottom of the lower bearing seat (38) and is adapted to the bottom of the lower bearing seat (38). The lower end face of the oil bladder (51) abuts against the base (52).

6. A submersible pump for wells that is not prone to clogging according to claim 1, characterized in that: The electrical component (6) includes a heat shrink tubing (61) installed on the pump barrel (11), a cable (62) installed inside the heat shrink tubing (61), the cable (62) passing through the heat shrink tubing (61) and into the machine barrel (31) to be electrically connected to the stator winding (37), and a pressure plate (63) is provided on one side of the cable (62).

7. A submersible well pump that is not easily clogged according to claim 1, characterized in that: The impeller (13) and guide vane (14) are made of PS material and are alternately fitted on the pump shaft (12). The pump barrel (11) is made of SUS304 material with a smooth inner wall transition, reducing the risk of particle wear and deposition.

8. A submersible pump for wells that is not prone to clogging according to claim 4, characterized in that: The mesh cover (41) is a porous streamlined structure made of 2Cr13 / SUS304 material, and has water inlet holes evenly opened around the circumference. Water flows through the mesh cover (41) and enters the pump cylinder (11) around the circumference. The flow channel has no dead corners and no obstruction, avoiding fiber entanglement and particle deposition blockage. The copper sleeve (42) is made of ZCuZn38 brass material and is fitted on the connection section between the pump shaft (12) and the rotating shaft. It cooperates with the abacus bead sleeve (43) to form a wear-resistant protective structure for the water inlet section, reducing the wear of sand particles on the rotating shaft.

9. A submersible pump for wells that is not prone to clogging according to claim 5, characterized in that: The oil bladder (51) is made of nitrile rubber and is linked with the mechanical seal (33) to seal and prevent sand and water from entering the motor cavity.

10. A submersible well pump that is not easily clogged according to claim 4, characterized in that: A retaining ring (17) is provided between the connecting structure (8) and the pump cylinder (11), the machine cylinder (31), and between the machine cylinder (31) and the lower bearing seat (38).

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