Anti-winding self-cleaning submersible electric pump

Abstract

This invention discloses an anti-winding self-cleaning submersible pump, comprising a pump casing, an inlet horn, an outlet horn, a motor stator, a motor rotor, an inlet guide vane, an inlet guide cone, an outlet guide vane, an outlet guide cone, a support shaft, a main bearing, and an impeller. The key feature is that a rotating guide vane is installed inside the inlet casing; the right end of the guide vane shaft is connected to the rotating shaft; a first bearing is installed in a groove at the left end of the support shaft; the rotating guide vane rotates passively under the influence of the liquid; an internal threaded hole is provided at the right end of the guide vane shaft, and an external thread is provided at the left end of the rotating shaft; the threaded connection between the guide vane shaft and the rotating shaft allows for adjustment of the axial position of the rotating guide vane relative to the inlet guide vane or inlet guide cone. This invention improves the liquid flow state at the pump inlet, enhances the pump's anti-cavitation performance, reduces flow losses, suppresses backflow, has a self-cleaning function, improves the hydraulic performance, operational stability, and service life of the submersible pump, and saves energy.

Description

Technical Field

[0001] This invention relates to the field of axial flow pump technology, and more specifically to an anti-winding self-cleaning submersible electric pump. Background Technology

[0002] like Figure 5 As shown, an existing submersible electric pump includes a pump casing, with an inlet horn and an outlet horn connected to its two ends respectively. A motor stator is installed on the inner side of the pump casing. An inlet guide vane is connected to the inner side of the inlet horn, and an inlet guide cone is connected to the inner side of the inlet guide vane. An outlet guide vane is connected to the inner side of the outlet horn, and an outlet guide cone is connected to the inner side of the outlet guide vane. Both ends of a support shaft / main shaft are connected to the inlet guide cone and the outlet guide cone respectively. An impeller is installed in the middle of the support shaft through a main bearing. A motor rotor is connected to the outer circumference of the impeller. A sealing assembly is provided between the impeller and the support shaft. A filter screen is installed on the inlet horn and / or the outlet horn.

[0003] However, existing anti-winding submersible electric pumps still have the following problems: (1) The axial position between the guide vane shaft and the rotating shaft is not adjustable, resulting in poor adjustability of the liquid flow state at the pump inlet and the pump's anti-cavitation performance. (2) The flow loss and undesirable backflow between the root of the rotating guide vane and the root of the inlet guide vane are large, reducing the pump's hydraulic performance. (3) Impurities accumulate / pile in the first gap, the second gap, the inner cavity of the inlet guide cone, and the inner cavity of the outlet guide cone, resulting in poor self-cleaning effect and reducing the pump's hydraulic performance and operational stability. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an anti-winding self-cleaning submersible pump. This pump improves the liquid flow state at the pump inlet, enhancing its cavitation resistance. It also adjusts the liquid flow state at the pump inlet, further improving cavitation resistance, operational stability, and service life, while saving energy. Furthermore, it reduces flow losses and suppresses backflow, improving the liquid flow state at the tail of the outlet guide cone. Simultaneously, it prevents the accumulation of fine impurities in the water at the first gap, second gap, the inner cavity of the inlet guide cone, and the inner cavity of the outlet guide cone, exhibiting a self-cleaning function. This enhances the hydraulic performance, operational stability, and service life of the submersible pump, while saving energy.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A self-cleaning, anti-winding submersible pump includes a pump casing with an inlet horn and an outlet horn connected to its two ends. A motor stator is mounted on the inner side of the pump casing. An inlet guide vane is connected to the inner side of the inlet horn, and an inlet guide cone is connected to the inner side of the inlet guide vane. An outlet guide vane is connected to the inner side of the outlet horn, and an outlet guide cone is connected to the inner side of the outlet guide vane. A support shaft is connected to the inlet and outlet guide cones at both ends. An impeller is mounted on the middle of the support shaft via a main bearing. A motor rotor is connected to the outer circumference of the impeller. A sealing assembly is provided between the impeller and the support shaft. The pump is characterized by: an inlet horn... An inlet cylinder is installed at the upstream end of the pump, and a filter screen is installed at the upstream end of the inlet cylinder. A rotating guide vane is installed inside the inlet cylinder. The right end of the guide vane shaft is connected to a rotating shaft. The rotating shaft passes through the inlet guide cone and enters the central hole of the support shaft. A first support wing is connected between the left end of the support shaft and the inner circumferential surface of the inlet guide cone. A first bearing is installed in the groove on the end face of the left end of the support shaft. The rotating guide vane is passively rotated under the drive of the liquid. An internal threaded hole is opened at the right end of the guide vane shaft, and an external thread is provided at the left end of the rotating shaft. The threaded connection between the guide vane shaft and the rotating shaft makes the axial position of the rotating guide vane relative to the inlet guide vane or the inlet guide cone adjustable.

[0006] Furthermore, a transition cover is provided between the guide vane shaft and the inlet guide cone. The transition cover is fitted on the outer circumferential surface of the rotating shaft and is truncated cone-shaped. An elastic sleeve is connected to the left end of the transition cover, and the left end of the elastic sleeve is connected to the right end face of the guide vane shaft. The right end of the transition cover abuts against the inlet guide cone. When the axial position of the rotating guide vane is adjusted relative to the inlet guide vane, the left end of the transition cover abuts against the right end face of the guide vane shaft through the elastic sleeve, and the right end of the transition cover abuts against the outer arc surface of the inlet guide cone. This allows the liquid at the root of the rotating guide vane to smoothly pass through the outer circumferential surface of the transition cover and the outer arc surface of the inlet guide cone and flow to the root of the inlet guide vane.

[0007] Furthermore, the transition shroud and the elastic sleeve rotate together with the guide vane shaft; or, the transition shroud and the elastic sleeve remain stationary relative to the inlet guide cone, while the guide vane shaft rotates relative to the transition shroud.

[0008] Furthermore, the impeller has a left end plate, which is connected to the support shaft via a sealing assembly. A first connecting cylinder is provided on the left end plate, and a first helical blade is provided on the outer circumferential surface of the first connecting cylinder. A first gap exists between the left end plate and the right end face of the inlet guide cone. A first guide wheel is installed on the rotating shaft, and the first guide wheel is located inside the cavity of the inlet guide cone. Multiple first connecting holes distributed circumferentially are opened on the outer arc surface of the inlet guide cone. In the axial direction, the position of the first guide wheel is aligned with the position of the first connecting holes to form a first liquid flow path. The first liquid flow path is: first gap → first helical blade → cavity of inlet guide cone → first guide wheel → first connecting hole → outer arc surface of inlet guide cone → root of inlet guide blade.

[0009] Furthermore, the first guide wheel includes a base plate and blades, with multiple blades distributed circumferentially along the base plate and the blades disposed on the right side of the base plate; in the axial direction, the position of the base plate and / or the blades is aligned with the position of the first connecting hole.

[0010] Furthermore, a plurality of second connecting holes are provided on the outer peripheral wall of the transition cover, and the second connecting holes respectively connect the inner cavity of the transition cover and the outer surface of the transition cover; the inner cavity of the transition cover and the inner cavity of the inlet guide cone are fluidly connected through the gap between the outer peripheral surface of the rotating shaft and the inlet guide cone.

[0011] Furthermore, the support shaft has a through central hole, the impeller has a right end plate, the right end plate is connected to the support shaft through a sealing assembly, a second connecting cylinder is provided on the right end plate, and a second helical blade is provided on the outer circumferential surface of the second connecting cylinder; a second support wing is connected between the right end of the support shaft and the inner circumferential surface of the outlet guide cone, a second bearing is installed in the end face groove of the right end of the support shaft, the rotating shaft is rotatably connected to the support shaft through the first bearing and the second bearing, and there is a second gap between the right end plate and the left end face of the outlet guide cone; the rotating shaft passes through and extends out of the central hole, a second guide wheel is installed on the right end of the rotating shaft, a central through hole is provided on the right end of the outlet guide cone, the second guide wheel is located adjacent to the central through hole to form a second liquid flow path, the second liquid flow path is: second gap → second helical blade → inner cavity of outlet guide cone → second guide wheel → central through hole → outside of outlet guide cone.

[0012] Furthermore, a flow guide cone is provided at the right end of the rotating shaft, which penetrates and extends out of the central through hole.

[0013] Furthermore, the inner circumferential surface of the outlet guide cone is provided with an arc-shaped guide section, which is located near the central through hole. The inner diameter of the arc-shaped guide section gradually decreases from the left end to the right end, and the second guide wheel is located inside the inner hole of the arc-shaped guide section.

[0014] Furthermore, the spiral / tilting direction of the rotating guide vane is opposite to that of the second guide wheel, and the outer diameter of the rotating guide vane is much larger than that of the second guide wheel.

[0015] This invention discloses an anti-winding self-cleaning submersible pump. The rotating guide vane passively rotates under the influence of the liquid. The guide vane shaft is threadedly connected to the rotating shaft, allowing the axial position of the rotating guide vane relative to the inlet horn, inlet guide vane, or inlet guide cone to be adjustable. This eliminates the need for additional motor power. It improves the liquid flow state at the submersible pump inlet, enhancing the pump's anti-cavitation performance. Furthermore, it can adjust the liquid flow state at the pump inlet, regulating the pump's anti-cavitation performance, improving the submersible pump's operational stability and service life, and saving energy.

[0016] This invention, through the design of a transition cover and an elastic sleeve, allows the liquid at the root of the rotating guide vane to smoothly pass through the outer circumference of the transition cover and the outer arc surface of the inlet guide cone and flow to the root of the inlet guide vane. This can reduce flow loss, suppress backflow, improve the hydraulic performance of the submersible pump, and increase the pump efficiency.

[0017] This invention discloses an anti-winding self-cleaning submersible pump. Through the design of a first liquid flow path and a second liquid flow path, the first liquid flow path is: first gap → first helical blade → inlet guide cone inner cavity → first guide wheel → first connecting hole → outer arc surface of inlet guide cone → root of inlet guide blade; the second liquid flow path is: second gap → second helical blade → outlet guide cone inner cavity → second guide wheel → central through hole → outside of outlet guide cone. This design further reduces flow loss and suppresses backflow, improving the liquid flow state at the tail of the outlet guide cone. Simultaneously, it prevents fine impurities in the water from accumulating in the first gap, second gap, inlet guide cone inner cavity, and outlet guide cone inner cavity, exhibiting a self-cleaning effect. This design enhances the hydraulic performance, operational stability, and service life of the submersible pump, while saving energy. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the anti-winding self-cleaning submersible electric pump structure of the present invention; Figure 2 This is a schematic diagram of an embodiment of the anti-winding self-cleaning submersible electric pump of the present invention; Figure 3 This is a schematic diagram of another embodiment of the anti-winding self-cleaning submersible electric pump of the present invention; Figure 4 This is a schematic diagram of the flow path / flow channel structure of the anti-winding self-cleaning submersible electric pump of the present invention; Figure 5 This is a schematic diagram of the structure of a submersible electric pump using existing technology.

[0019] In the diagram: 1. Pump casing; 2. Inlet horn; 3. Outlet horn; 4. Motor stator; 5. Motor rotor; 6. Impeller; 7. Support shaft / main shaft; 8. Inlet guide vane; 9. Inlet guide cone; 10. Outlet guide vane; 11. Outlet guide cone; 12. Main bearing; 13. Sealing assembly; 14. Filter screen; 20. Inlet cylinder; 21. Rotating guide vane; 22. Guide vane shaft; 23. Rotating shaft / core shaft; 24. First support wing / rib; 25. First bearing; 26. Transition cover; 27. Elastic sleeve / spring; 28. First connecting cylinder / ring; 29. ​​First spiral blade; 30. First guide wheel; 31. First connecting hole; 32. Base plate; 33. Blade; 34. Second connecting hole; 35. Second support wing / rib; 36. Second connecting cylinder / ring; 37. Second spiral blade; 38. Second guide wheel; 39. Central through hole; 40. Guide tail cone; 41. Arc-shaped guide section; 42. Arrow "→": Liquid flow direction. Detailed Implementation

[0020] Example 1: To make the technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of the present invention, and are only used to explain the present invention, not to limit the present invention. It should be noted that, for ease of description, only the parts / structures related to the present invention are shown in the accompanying drawings. Other related parts can be referred to with ordinary design. In the absence of conflict, the embodiments and technical features in the embodiments of the present invention can be combined with each other to obtain new embodiments.

[0021] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. Furthermore, unless otherwise defined, the technical or scientific terms used in the description of this invention should have the ordinary meaning understood by those skilled in the art.

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] like Figure 1-4 As shown, an anti-winding self-cleaning submersible pump includes a pump casing 1. An inlet horn 2 and an outlet horn 3 are connected to both ends of the pump casing 1. A motor stator 4 is mounted on the inner side of the pump casing 1. An inlet guide vane 8 is connected to the inner side of the inlet horn 2, and an inlet guide cone 9 is connected to the inner side of the inlet guide vane 8. An outlet guide vane 10 is connected to the inner side of the outlet horn 3, and an outlet guide cone 11 is connected to the inner side of the outlet guide vane 10. Both ends of a support shaft / main shaft 7 are connected to the inlet guide cone 9 and the outlet guide cone 11, respectively. An impeller 6 is mounted in the middle of the support shaft / main shaft 7 via a main bearing 12. A motor rotor 5 is connected to the outer circumferential surface of the impeller 6. A sealing assembly 13 is provided between the impeller 6 and the support shaft 7.

[0024] An inlet cylinder 20 is installed at the upstream end of the inlet horn 2. The inlet cylinder 20 and the inlet horn 2 are connected by an end face flange and bolts. A filter screen 14 is installed at the upstream end of the inlet cylinder 20. Rotary guide vanes 21 are installed inside the inlet cylinder 20. Multiple rotary guide vanes 21 are fixedly connected to the outer circumferential surface of the guide vane shaft 22. The right end of the guide vane shaft 22 is connected to the rotating shaft / core shaft 23. The rotating shaft 23 passes through the inlet guide cone 9 and enters the center hole of the support shaft 7. A first support wing / rib 2 is connected between the left end of the support shaft 7 and the inner circumferential surface of the inlet guide cone 9. 4. A first bearing 25 is installed in the groove on the end face of the left end of the support shaft 7. The rotating shaft / core shaft 23 is rotatably connected to the support shaft 7 through the first bearing 25. The rotating guide vane 21 has a preset blade inlet angle and blade outlet angle. The rotating guide vane 21 is passively rotated under the drive of the liquid. The right end of the guide vane shaft 22 is provided with an internal thread hole, and the left end of the rotating shaft 23 is provided with an external thread. The threaded connection between the guide vane shaft 22 and the rotating shaft 23 makes the axial position of the rotating guide vane 21 relative to the inlet horn 2, the inlet guide vane 8, or the inlet guide cone 9 adjustable.

[0025] Filter screen 14 is used to filter impurities in the water and prevent long fibers / aquatic plants and other debris from getting tangled in the impeller 6 and guide vanes.

[0026] This invention utilizes the passive rotation of the rotating guide vane 21 driven by the liquid. The guide vane shaft 22 and the rotating shaft 23 are threadedly connected, allowing the axial position of the rotating guide vane 21 relative to the inlet horn 2, inlet guide vane 8, or inlet guide cone 9 to be adjustable. This eliminates the need for additional motor power (avoiding wasted motor power). It can improve the liquid flow state at the inlet of the submersible pump, enhance the pump's anti-cavitation performance, and adjust the liquid flow state at the pump inlet to regulate the pump's anti-cavitation performance, thereby improving the submersible pump's operational stability, service life, and saving energy.

[0027] like Figure 1-4 As shown, the arrow "→" indicates the direction of liquid flow.

[0028] A transition cover 26 is provided between the guide vane shaft 22 and the inlet guide cone 9. The transition cover 26 is sleeved on the outer circumferential surface of the rotating shaft 23 and is truncated cone-shaped. An elastic sleeve / spring 27 is connected to the left end of the transition cover 26. The left end of the elastic sleeve / spring 27 is connected to the right end face of the guide vane shaft 22, and the right end of the transition cover 26 abuts against the inlet guide cone 9. When the axial position of the rotating guide vane 21 is adjusted relative to the inlet guide vane 8, the left end of the transition cover 26 abuts against the right end face of the guide vane shaft 22 through the elastic sleeve 27, and the right end of the transition cover 26 abuts against the outer arc surface of the inlet guide cone 9. This allows the liquid at the blade root of the rotating guide vane 21 to smoothly pass through the outer circumferential surface of the transition cover 26 and the outer arc surface of the inlet guide cone 9 and flow to the blade root of the inlet guide vane 8.

[0029] The transition cover 26 and the elastic sleeve 27 rotate together with the guide vane shaft 22; or, the transition cover 26 and the elastic sleeve 27 are stationary relative to the inlet guide cone 9, while the guide vane shaft 22 rotates relative to the transition cover 26.

[0030] The present invention, through the design of the transition cover 26 and the elastic sleeve 27, allows the liquid at the root of the rotating guide vane 21 to smoothly pass through the outer peripheral surface of the transition cover 26 and the outer arc surface of the inlet guide cone 9 and flow to the root of the inlet guide vane 8. This can reduce flow loss, suppress backflow, improve the hydraulic performance of the submersible pump, and improve the pump efficiency.

[0031] In one embodiment, the impeller 6 (rotating component) has a left end plate, which is connected to the support shaft 7 (stationary component) via a sealing assembly 13. A first connecting cylinder / ring 28 is provided on the left end plate of the impeller 6. A first helical blade 29 is provided on the outer peripheral surface of the first connecting cylinder 28. A first gap is provided between the left end plate and the right end face of the inlet guide cone 9. The first helical blade 29 allows liquid to flow from the first gap into the inner cavity of the inlet guide cone 9.

[0032] A first guide wheel 30 is installed on the rotating shaft 23. The first guide wheel 30 is located inside the cavity of the inlet guide cone 9. Multiple first connecting holes 31 distributed circumferentially are opened on the outer arc surface of the inlet guide cone 9. In the axial direction, the position of the first guide wheel 30 is aligned with the position of the first connecting holes 31 to form a first liquid flow path. The first liquid flow path is: first gap → first spiral blade 29 → cavity of inlet guide cone 9 → first guide wheel 30 → first connecting hole 31 → outer arc surface of inlet guide cone 9 → root of inlet guide blade 8.

[0033] The first guide wheel 30 includes a base plate 32 and blades 33. Multiple blades 33 are distributed circumferentially along the base plate 32, and the blades 33 are located on the right side of the base plate 32. In the axial direction, the positions of the base plate 32 and / or the blades 33 are aligned with the position of the first connecting hole 31.

[0034] This invention, through the design of a first liquid flow path, is as follows: first gap → first spiral blade 29 → inner cavity of inlet guide cone 9 → first guide wheel 30 → first connecting hole 31 → outer arc surface of inlet guide cone 9 → root of inlet guide vane 8. This design can further reduce flow loss and suppress backflow. At the same time, it can prevent fine impurities in the water from accumulating in the first gap and inner cavity of inlet guide cone 9, thus having a self-cleaning effect. This design can improve the operational stability and service life of the submersible pump and save energy.

[0035] In one embodiment, a plurality of second connecting holes 34 are provided on the outer peripheral wall of the transition cover 26. The second connecting holes 34 respectively connect the inner cavity of the transition cover 26 and the outer surface of the transition cover 26, which can balance the internal and external pressures of the transition cover 26 and reduce pressure pulsation.

[0036] The inner cavity of the transition cover 26 is fluidly connected to the inner cavity of the inlet guide cone 9 through the gap between the outer circumferential surface of the rotating shaft 23 and the inlet guide cone 9, which can balance the internal and external pressures of the transition cover 26 and reduce pressure pulsation.

[0037] like Figure 1-4 As shown, the arrow "→" indicates the direction of liquid flow.

[0038] In one embodiment, the support shaft 7 has a through central hole, the impeller 6 has a right end plate, the right end plate is connected to the support shaft 7 through a sealing assembly 13, the right end plate of the impeller 6 is provided with a second connecting cylinder 37, and the outer peripheral surface of the second connecting cylinder 37 is provided with a second spiral blade 38; a second support wing / rib 35 is connected between the right end of the support shaft 7 and the inner peripheral surface of the outlet guide cone 11, a second bearing 36 is installed in the end face groove of the right end of the support shaft 7, the rotating shaft 23 is rotatably connected to the support shaft 7 through the first bearing 25 and the second bearing 36, there is a second gap between the right end plate and the left end face of the outlet guide cone 11, and the second spiral blade 38 causes the liquid to flow from the second gap into the inner cavity of the outlet guide cone 11.

[0039] A rotating shaft 23 passes through and extends out of the central hole. A second guide wheel 39 is installed at the right end of the rotating shaft 23. The second guide wheel 39 has a preset blade inlet angle and blade outlet angle. A central through hole 40 is opened at the right end of the outlet guide cone 11. The second guide wheel 39 is arranged adjacent to the central through hole 40 to form a second liquid flow path. The second liquid flow path is: second gap → second spiral blade 38 → inner cavity of outlet guide cone 11 → second guide wheel 39 → central through hole 40 → outside of outlet guide cone 11.

[0040] This invention utilizes a second liquid flow path design, which consists of: a second gap → a second spiral blade 38 → the inner cavity of the outlet guide cone 11 → a second guide wheel 39 → a central through hole 40 → the outside of the outlet guide cone 11. This design improves the liquid flow at the tail of the outlet guide cone 11. Simultaneously, it prevents fine impurities in the water from accumulating in the second gap and the inner cavity of the outlet guide cone 11, thus providing a self-cleaning effect. This design enhances the hydraulic performance and operational stability of the submersible pump, while saving energy.

[0041] A flow guide cone 41 is provided at the right end of the rotating shaft 23. The flow guide cone 41 passes through and extends out of the central through hole 40, which can further improve the liquid flow state at the tail of the outlet flow guide cone 11.

[0042] An arc-shaped guide section 42 is provided on the inner circumferential surface of the outlet guide cone 11. The arc-shaped guide section 42 is located near the central through hole 40, and the inner diameter of the arc-shaped guide section 42 gradually decreases from the left end to the right end. The second guide wheel 39 is located in the inner hole of the arc-shaped guide section 42, which has a guiding function and allows the liquid to flow smoothly to the outside of the outlet guide cone 11.

[0043] In one embodiment, the spiral / tilting direction of the rotating guide vane 21 is opposite to the spiral / tilting direction of the second guide wheel 39, so that the rotating guide vane 21 can drive the second guide wheel 39 to rotate via the rotating shaft 23.

[0044] The outer diameter of the rotating guide vane 21 is much larger than the outer diameter of the second guide wheel 39.

[0045] This invention discloses an anti-winding self-cleaning submersible pump. The rotating guide vane 21 passively rotates under the influence of the liquid. The guide vane shaft 22 is threadedly connected to the rotating shaft 23, allowing the axial position of the rotating guide vane 21 relative to the inlet horn 2, inlet guide vane 8, or inlet guide cone 9 to be adjustable. This eliminates the need for additional motor power (avoiding wasted motor power). It improves the liquid flow state at the submersible pump inlet, enhancing the pump's anti-cavitation performance. Furthermore, it can adjust the liquid flow state at the pump inlet, regulating the pump's anti-cavitation performance, improving the submersible pump's operational stability and service life, and saving energy.

[0046] The present invention, through the design of the transition cover 26 and the elastic sleeve 27, allows the liquid at the root of the rotating guide vane 21 to smoothly pass through the outer peripheral surface of the transition cover 26 and the outer arc surface of the inlet guide cone 9 and flow to the root of the inlet guide vane 8. This can reduce flow loss, suppress backflow, improve the hydraulic performance of the submersible pump, and improve the pump efficiency.

[0047] This invention discloses an anti-winding self-cleaning submersible pump. Through the design of a first liquid flow path and a second liquid flow path, the first liquid flow path is: first gap → first helical blade 29 → inner cavity of inlet guide cone 9 → first guide wheel 30 → first connecting hole 31 → outer arc surface of inlet guide cone 9 → root of inlet guide vane 8; the second liquid flow path is: second gap → second helical blade 38 → inner cavity of outlet guide cone 11 → second guide wheel 39 → central through hole 40 → outside of outlet guide cone 11. This design further reduces flow loss and suppresses backflow, improving the liquid flow state at the tail of outlet guide cone 11. Simultaneously, it prevents fine impurities in the water from accumulating in the first gap, second gap, inner cavity of inlet guide cone 9, and inner cavity of outlet guide cone 11, thus exhibiting a self-cleaning effect. This design enhances the hydraulic performance, operational stability, and service life of the submersible pump, while saving energy.

[0048] Example 2: Further based on Example 1, the present invention may provide a spiral groove [1] on the outer circumferential surface of the motor rotor. The spiral groove extends along the axial direction of the motor rotor, and its spiral direction matches the rotation direction of the motor rotor. The spiral angle is 15° to 30°, and the number is 3 to 6, which are evenly distributed along the outer circumferential surface of the motor rotor. The spiral groove rotates synchronously with the motor rotor, forming a directional flow of cooling liquid in the motor cavity, which flushes the stator winding, rotor and main bearing areas, prevents impurities from accumulating on the inner wall of the motor cavity and in the rotor gap, realizes continuous self-cleaning inside the motor cavity, effectively reduces the risk of poor heat dissipation and bearing wear caused by impurity deposition, and extends the service life of the submersible pump.

[0049] It is known in the art that a spiral groove is provided on the outer peripheral surface of the motor rotor, and the rotation of the rotor drives the flow of liquid in the cavity to achieve heat dissipation. Therefore, based on this, the present invention further utilizes the directional liquid flow generated by the spiral groove to continuously flush the inside of the motor cavity, so that the spiral groove has both heat dissipation and self-cleaning functions.

[0050] The above embodiments are illustrative of the present invention and not intended to limit the invention. It is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-winding self-cleaning submersible electric pump, comprising a pump casing, an inlet horn and an outlet horn connected to both ends of the pump casing respectively, a motor stator mounted on the inner side of the pump casing, an inlet guide vane connected to the inner side of the inlet horn, an inlet guide cone connected to the inner side of the inlet guide vane, an outlet guide vane connected to the inner side of the outlet horn, an outlet guide cone connected to the inner side of the outlet guide vane, a support shaft connected to the inlet guide cone and the outlet guide cone at both ends respectively, an impeller mounted on the middle of the support shaft via a main bearing, a motor rotor connected to the outer circumferential surface of the impeller, and a sealing assembly provided between the impeller and the support shaft; Its features are: An inlet cylinder is installed at the upstream end of the inlet horn, and a filter screen is installed at the upstream end of the inlet cylinder. A rotating guide vane is installed inside the inlet cylinder. The right end of the guide vane shaft is connected to a rotating shaft. The rotating shaft passes through the inlet guide cone and enters the central hole of the support shaft. A first support wing is connected between the left end of the support shaft and the inner circumferential surface of the inlet guide cone. A first bearing is installed in the groove on the end face of the left end of the support shaft. The rotating guide vane is passively rotated under the drive of the liquid. An internal threaded hole is opened at the right end of the guide vane shaft, and an external thread is provided at the left end of the rotating shaft. The threaded connection between the guide vane shaft and the rotating shaft allows the axial position of the rotating guide vane relative to the inlet guide vane or the inlet guide cone to be adjustable.

2. The anti-winding self-cleaning submersible pump as described in claim 1, characterized in that, A transition cover is provided between the guide vane shaft and the inlet guide cone. The transition cover is fitted on the outer circumference of the rotating shaft and is truncated cone-shaped. An elastic sleeve is connected to the left end of the transition cover. The left end of the elastic sleeve is connected to the right end face of the guide vane shaft, and the right end of the transition cover abuts against the inlet guide cone. When the axial position of the rotating guide vane is adjusted relative to the inlet guide vane, the left end of the transition cover abuts against the right end face of the guide vane shaft through the elastic sleeve, and the right end of the transition cover abuts against the outer arc surface of the inlet guide cone. This allows the liquid at the root of the rotating guide vane to smoothly pass through the outer circumference of the transition cover and the outer arc surface of the inlet guide cone and flow to the root of the inlet guide vane.

3. The anti-winding self-cleaning submersible pump as described in claim 2, characterized in that, The transition cover and elastic sleeve rotate together with the guide vane shaft; or, the transition cover and elastic sleeve are stationary relative to the inlet guide cone, while the guide vane shaft rotates relative to the transition cover.

4. The anti-winding self-cleaning submersible pump as described in claim 2, characterized in that, The impeller has a left end plate, which is connected to the support shaft via a sealing assembly. A first connecting cylinder is provided on the left end plate, and a first helical blade is provided on the outer circumferential surface of the first connecting cylinder. There is a first gap between the left end plate and the right end face of the inlet guide cone. A first guide wheel is installed on the rotating shaft. The first guide wheel is located inside the cavity of the inlet guide cone. Multiple first connecting holes distributed circumferentially are opened on the outer arc surface of the inlet guide cone. In the axial direction, the position of the first guide wheel is aligned with the position of the first connecting holes to form a first liquid flow path. The first liquid flow path is: first gap → first helical blade → cavity of inlet guide cone → first guide wheel → first connecting hole → outer arc surface of inlet guide cone → root of inlet guide blade.

5. The anti-winding self-cleaning submersible pump as described in claim 4, characterized in that, The first guide wheel includes a base plate and blades. Multiple blades are distributed circumferentially along the base plate, and the blades are located on the right side of the base plate. In the axial direction, the position of the base plate and / or the blades is aligned with the position of the first connecting hole.

6. The anti-winding self-cleaning submersible pump as described in claim 4, characterized in that, Multiple second connecting holes are provided on the outer peripheral wall of the transition cover, which respectively connect the inner cavity of the transition cover and the outer side of the transition cover; the inner cavity of the transition cover and the inner cavity of the inlet guide cone are fluidly connected through the gap between the outer peripheral surface of the rotating shaft and the inlet guide cone.

7. The anti-winding self-cleaning submersible pump as described in claim 2, characterized in that, The support shaft has a through-hole in the center. The impeller has a right end plate, which is connected to the support shaft via a sealing assembly. A second connecting cylinder is mounted on the right end plate, and a second helical blade is mounted on the outer circumferential surface of the second connecting cylinder. A second support wing is connected between the right end of the support shaft and the inner circumferential surface of the outlet guide cone. A second bearing is installed in the end face groove of the right end of the support shaft. The rotating shaft is rotatably connected to the support shaft via a first bearing and a second bearing. A second gap exists between the right end plate and the left end face of the outlet guide cone. The rotating shaft passes through and extends out of the center hole. A second guide wheel is mounted on the right end of the rotating shaft. A central through-hole is opened at the right end of the outlet guide cone. The second guide wheel is positioned adjacent to the central through-hole to form a second liquid flow path. The second liquid flow path is: second gap → second helical blade → inner cavity of the outlet guide cone → second guide wheel → central through-hole → outside of the outlet guide cone.

8. The anti-winding self-cleaning submersible pump as described in claim 7, characterized in that, A flow guide cone is provided at the right end of the rotating shaft, which passes through and extends out of the central through hole.

9. The anti-winding self-cleaning submersible pump as described in claim 8, characterized in that, An arc-shaped guide section is provided on the inner circumferential surface of the outlet guide cone. The arc-shaped guide section is located near the central through hole, and the inner diameter of the arc-shaped guide section gradually decreases from the left end to the right end. The second guide wheel is located inside the inner hole of the arc-shaped guide section.

10. The anti-winding self-cleaning submersible pump as described in claim 8, characterized in that, The spiral / tilting direction of the rotating guide vane is opposite to that of the second guide wheel, and the outer diameter of the rotating guide vane is much larger than that of the second guide wheel.

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