High-efficiency energy-saving full-cross-flow submersible pump

Abstract

The application discloses a kind of high-efficiency energy-saving full-through flow submersible pumps, it includes pump shell, inlet horn, outlet horn, motor stator, motor rotor, inlet guide vane, inlet flow cone, outlet guide vane, outlet flow cone, main shaft, first bearing, impeller;Its characterized in that: the inner periphery of inlet cylinder is connected with fixed guide vane, inner cylinder, the center ring of fixed guide vane is equipped with second bearing, second bearing is equipped with connecting shaft in, connecting shaft is connected with rotating guide vane, rotating guide vane is driven to rotate passively under the drive of liquid;The outer periphery of fixed guide vane has outer ring, multiple axial passages distributed along the circumferential direction are formed in the outer ring, the inner side surface of the right end of inner cylinder is formed with recess, the right end surface of outer ring and inlet horn form angle area, angle area is connected with recess by axial passage and forms local flow guide at outer periphery top edge.The application can improve the effect of suppressing cavitation, and can be pre-pressurized;It can reduce impact flow loss, reduce pressure pulsation, and improve the running stability of submersible pump.

Description

Technical Field

[0001] This invention relates to the field of axial flow pump technology, specifically to a high-efficiency and energy-saving full-flow submersible pump. Background Technology

[0002] like Figure 1 As shown, an existing full-flow / axial-flow submersible 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. The two ends of the main shaft are connected to the inlet guide cone and the outlet guide cone respectively. An impeller is installed in the middle of the main shaft through a first bearing. A motor rotor is connected to the outer circumferential surface of the impeller. A sealing assembly is provided between the impeller and the main shaft.

[0003] However, existing full-flow / axial-flow submersible pumps still have the following problems: (1) The relative axial position of the outer peripheral top edge of the rotating guide vane and the groove is not adjustable, the length of the local backflow path is not adjustable, and the axial length and volume of the corner area are not adjustable. Under different working conditions, the impact / collision flow / hydraulic loss is large, the pressure pulsation is large, and the backflow adjustment of the liquid in the corner area is poor. (2) The flow of liquid from the inlet guide assembly and the inlet guide cone to the inlet guide vane is not smooth. (3) The low potential energy fluid accumulation in the corner area of ​​the submersible pump, the effective backflow effect to overcome the dead water in the corner area, the suppression of cavitation effect, and the operational stability need to be further improved. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a high-efficiency, energy-saving, full-flow submersible pump that improves the liquid flow state at the pump inlet, enhances cavitation suppression, and enables pre-pressurization. It also promotes the backflow of vortices in the corner region, reduces impact / collision flow losses, lowers pressure pulsation, and improves the operational stability of the submersible pump. Here, "promoting backflow" does not mean encouraging lossy, random backflow, but rather constructing an organized, directional backflow path through an inclined guide surface to guide the orderly flow of vortices in the corner region.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A high-efficiency and energy-saving full-flow submersible pump includes a pump casing, with an inlet horn and an outlet horn connected to its two ends respectively. 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. Both ends of a main shaft are connected to the inlet guide cone and the outlet guide cone respectively. An impeller is mounted on the middle of the main shaft via a first bearing. A motor rotor is connected to the outer circumference of the impeller. A sealing assembly is provided between the impeller and the main shaft. The pump is characterized in that an inlet guide assembly is installed at the upstream end of the inlet horn. The component includes an inlet cylinder, which is connected to an inlet horn via an end face flange and bolts. A fixed guide vane and an inner cylinder are connected to the inner circumferential surface of the inlet cylinder. A second bearing is installed in the central ring of the fixed guide vane, and a connecting shaft is installed in the second bearing. A rotating guide vane is connected to the connecting shaft and is passively rotated by the liquid. The outer circumference of the fixed guide vane has an outer ring with multiple axial channels distributed circumferentially inside. A groove is provided on the inner side of the right end of the inner cylinder. A corner area is formed between the right end face of the outer ring and the inlet horn. The top edge of the outer circumference of the rotating guide vane is adjacent to the inner circumferential surface of the inner cylinder and the groove. The corner area is connected to the groove through the axial channels and forms a local backflow at the top edge of the outer circumference.

[0006] Furthermore, the flow path formed at the outer peripheral top edge of the rotating guide vane is: corner area → axial channel → groove → outer peripheral top edge → inner peripheral surface of outer ring → inlet horn.

[0007] Furthermore, the inner cylinder has an external thread, the inlet cylinder has an internal thread, and the inner cylinder and the inlet cylinder are threadedly connected, so that the axial clearance g1 between the right end face of the inner cylinder and the left end face of the outer ring can be adjusted, the relative axial position of the outer peripheral top edge of the corresponding rotating guide vane and the groove can be adjusted, and the length of the local backflow path can be adjusted.

[0008] Furthermore, the outer ring has an external thread, and the outer ring is threadedly connected to the inlet cylinder, so that the axial clearance g1 between the outer ring and the inner cylinder can be adjusted, the relative axial position of the outer peripheral top edge of the corresponding rotating guide vane and the groove can be adjusted, and the length of the local backflow path can be adjusted; so that the axial clearance g3 between the outer ring and the end face flange of the inlet horn or inlet cylinder can be adjusted, and the axial length and volume of the corresponding corner area can be adjusted.

[0009] Furthermore, the inlet end of the axial channel is provided with a first inclined guide surface, and the inlet end of the groove is provided with a second inclined guide surface to promote the backflow of liquid in the corner region. Similarly, "promoting backflow" here means constructing an organized and directional backflow path through the inclined guide surfaces to guide the orderly flow of the vortex in the corner region. Furthermore, relative to the rotation axis of the rotating guide vane, the outer ring has an inner diameter R1, the inner cylinder has an inner diameter R2, the groove has an outer diameter R3, and the axial channel has an outer diameter R4, where R1 < R2 < R3 < R4.

[0010] Furthermore, an intermediate cylinder is provided on the inner side of the rotating guide vane, and an inner guide vane is fixedly provided on the inner side of the intermediate cylinder. The inner guide vane is fixedly connected to the outer circumferential surface of the connecting shaft. The rotating guide vane and the inner guide vane rotate passively together under the drive of the liquid, thereby forming an inner flow channel.

[0011] Furthermore, the inner diameter of the intermediate cylinder is larger than the outer diameter of the central ring of the fixed guide vane, and the ratio of the inner diameter to the outer diameter of the intermediate cylinder is less than or equal to the outer diameter of the inlet guide cone, so that the liquid flows smoothly to the outer arc surface of the inlet guide cone.

[0012] Furthermore, the inner diameter / outer diameter of the intermediate cylinder is equal to 0.7-1 times the outer diameter of the inlet guide cone; the axial length of the connecting shaft is greater than the axial length of the intermediate cylinder, and the axial length of the intermediate cylinder is greater than the axial length of the rotating guide vane.

[0013] Furthermore, the tail end of the connecting shaft is provided with an arc-shaped part, which is located adjacent to the inlet guide cone. The arc-shaped part protrudes from the second bearing, and the axial gap g2 between the arc-shaped part and the inlet guide cone can be adjusted by adjusting the axial position of the outer ring, so that the liquid between the arc-shaped part and the inlet guide cone flows smoothly along the outer arc surface of the inlet guide cone to the inlet guide vane.

[0014] This invention discloses a high-efficiency and energy-saving full-flow submersible pump, which connects the inlet cylinder and the inlet horn via end face flanges and bolts. The inlet guide assembly is easy to install and disassemble. Through the design of fixed guide vanes and rotating guide vanes, the rotating guide vanes are passively rotated under the drive of the liquid, which can improve the liquid flow state at the pump inlet, enhance the cavitation suppression effect, and enable pre-pressurization. Through the design of local diversion flow path, it can promote the backflow of corner vortices, reduce impact / collision flow losses, reduce pressure pulsation, and improve the operational stability of the submersible pump.

[0015] This invention discloses a high-efficiency and energy-saving full-flow submersible pump. The inner cylinder has an external thread, the outer ring has an external thread, and the inlet cylinder has an internal thread. The axial positions of the inner cylinder and outer ring relative to the inlet cylinder are adjustable, allowing for adjustment of axial clearances g1, g3, and g2 (i.e., the relative axial position of the outer circumferential top edge of the rotating guide vane and the groove is adjustable, the length of the local backflow path is adjustable, and the axial length and volume of the corner region Q are adjustable). For different operating conditions, this design better promotes the backflow of vortices in the corner region, better guides the orderly flow of vortices in the corner region, reduces impact and collision flows and hydraulic losses, reduces pressure pulsation, improves the operational stability of the submersible pump, and also enhances energy-saving performance.

[0016] The present invention uses an intermediate cylinder with an inner diameter greater than the outer diameter of the central ring of the fixed guide vane, and an inner diameter / outer diameter ratio of the intermediate cylinder less than or equal to the outer diameter of the inlet guide cone, so that the liquid flows smoothly to the outer arc surface of the inlet guide cone; the axial position of the outer ring is adjustable so that the axial gap g2 between the arc-shaped part and the inlet guide cone is adjustable, so that the liquid between the arc-shaped part and the inlet guide cone flows smoothly along the outer arc surface of the inlet guide cone to the inlet guide vane. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an existing full-flow submersible pump. Figure 2 This is a schematic diagram of the structure of the full-flow submersible pump of the present invention; Figure 3 This is a partial structural diagram of the fully axial-flow submersible pump of the present invention in the first adjustment position; Figure 4 This is a partial structural diagram of the fully axial-flow submersible pump of the present invention in the second adjustment position; Figure 5 This is a schematic diagram of the flow path structure of the full-flow submersible pump of the present invention.

[0018] In the diagram: 1. Pump casing; 2. Inlet horn; 3. Outlet horn; 4. Motor stator; 5. Motor rotor; 6. Impeller; 7. Main shaft; 8. Inlet guide vane; 9. Inlet guide cone; 10. Outlet guide vane; 11. Outlet guide cone; 12. First bearing; 13. Sealing assembly; 20. Inlet cylinder; 21. Fixed guide vane; 22. Rotating guide vane; 23. Connecting shaft; 24. Second bearing; 25. Inner cylinder; 26. Outer ring; 27. Axial channel; 28. Groove; 29. ​​First inclined guide surface; 30. Second inclined guide surface; 31. Intermediate cylinder; 32. Inner guide vane; 33. Arc portion; 34. Corner area Q; Axial clearance g (g1, g2, g3); Arrow "→": Liquid flow direction. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings.

[0022] like Figure 2-5 As shown, a high-efficiency and energy-saving full-flow submersible pump includes a pump casing 1, with an inlet horn 2 and an outlet horn 3 connected to its two ends respectively. A motor stator 4 is installed 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. The two ends of a main shaft 7 are connected to the inlet guide cone 9 and the outlet guide cone 11 respectively. An impeller 6 is installed in the middle of the main shaft 7 through a first 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 main shaft 7. The pump is characterized in that an inlet guide assembly is installed at the upstream end of the inlet horn 2, and the inlet guide assembly includes an inlet cylinder 20. The inlet cylinder 20 and the inlet horn 2 are connected by end face flanges and bolts. The inner circumferential surface of the inlet cylinder 20 is connected to the fixed guide vane 21 and the inner cylinder 25. The central ring of the fixed guide vane 21 is equipped with a second bearing 24, and the second bearing 24 is equipped with a connecting shaft 23. The connecting shaft 23 is connected to the rotating guide vane 22, which is passively rotated by the liquid. The outer circumference of the fixed guide vane 21 has an outer ring 26, and multiple axial channels 27 distributed circumferentially are opened in the outer ring 26. The inner side of the right end of the inner cylinder 25 is provided with a groove 28. The right end face of the outer ring 26 and the inlet horn 2 form a corner area Q. The outer circumferential top edge of the rotating guide vane 22 is adjacent to the inner circumferential surface of the inner cylinder 25 and the groove 28. The corner area Q is connected to the groove 28 through the axial channel 27 and forms a local backflow at the outer circumferential top edge.

[0023] like Figure 2-5 As shown, the arrow "→" indicates the direction of liquid flow.

[0024] The flow path that forms a local backflow at the outer peripheral top edge of the rotating guide vane 22 is: corner area Q → axial channel 27 → groove 28 → outer peripheral top edge → inner peripheral surface of outer ring 26 → inlet horn 2.

[0025] This invention connects the inlet cylinder 20 and the inlet horn 2 via end face flanges and bolts, making the overall installation and disassembly of the inlet guide assembly convenient. Through the design of the fixed guide vane 21 and the rotating guide vane 22, the rotating guide vane 22 passively rotates under the influence of the liquid, which improves the liquid flow state at the pump inlet, enhances the cavitation suppression effect, and enables pre-pressurization. The design of the localized flow path promotes the backflow of vortices in the corner region, better guides the orderly flow of vortices in the corner region, reduces impact and collision flow and hydraulic losses, reduces pressure pulsation, and improves the operational stability of the submersible pump.

[0026] In one embodiment, the inner cylinder 25 has an external thread, and the inlet cylinder 20 has an internal thread. The inner cylinder 25 and the inlet cylinder 20 are threaded together so that the axial clearance g1 between the right end face of the inner cylinder 25 and the left end face of the outer ring 26 can be adjusted, the relative axial position of the outer peripheral top edge of the corresponding rotating guide vane 22 and the groove 28 can be adjusted, and the length of the local drainage path can be adjusted.

[0027] In one embodiment, the outer ring 26 has an external thread and is threadedly connected to the inlet cylinder 20, so that the axial clearance g1 between the outer ring 26 and the inner cylinder 25 is adjustable, the relative axial position of the outer peripheral top edge of the corresponding rotating guide vane 22 and the groove 28 is adjustable, and the length of the local drainage path is adjustable; so that the axial clearance g3 between the outer ring 26 and the end face flange of the inlet horn 2 or the inlet cylinder 20 is adjustable, and the axial length and volume of the corresponding corner area Q are adjustable.

[0028] This invention features an inner cylinder 25 with external threads, an outer ring 26 with external threads, and an inlet cylinder 20 with internal threads. The axial positions of the inner cylinder 25 and outer ring 26 relative to the inlet cylinder 20 are adjustable, allowing the axial clearances g1 and g3 to be adjusted (i.e., the relative axial position of the outer periphery of the rotating guide vane 22 and the groove 28 is adjustable, the length of the local backflow path is adjustable, and the axial length and volume of the corner region Q are adjustable). For different working conditions, this invention can better promote the backflow of the corner region vortex, reduce impact / collision flow / hydraulic losses, better reduce pressure pulsation, and improve the operational stability of the submersible pump.

[0029] Furthermore, the inlet end of the axial channel 27 is provided with a first inclined guide surface 29, and the inlet end of the groove 28 is provided with a second inclined guide surface 30, so as to promote the backflow of liquid in the corner region Q.

[0030] like Figure 3 As shown, relative to the rotation axis of the rotating guide vane 22, the outer ring 26 has an inner diameter R1, the inner cylinder 25 has an inner diameter R2, the groove 28 has an outer diameter R3, and the axial channel 27 has an outer diameter R4, where R1 < R2 < R3 < R4, which can better promote the backflow of liquid in the corner region Q.

[0031] In one embodiment, an intermediate cylinder 31 is provided on the inner side of the rotating guide vane 22, and an inner guide vane 32 is fixedly provided on the inner side of the intermediate cylinder 31. The inner guide vane 32 is fixedly connected to the outer peripheral surface of the connecting shaft 23. The rotating guide vane 22 and the inner guide vane 32 are passively rotated together under the drive of the liquid, thereby forming an inner flow channel to improve the liquid flow state at the center of the pump inlet and better improve the cavitation suppression effect.

[0032] Furthermore, the inner diameter of the intermediate cylinder 31 is greater than the outer diameter of the central ring of the fixed guide vane 21, and the inner diameter / outer diameter of the intermediate cylinder 31 is less than or equal to the outer diameter of the inlet guide cone 9, so that the liquid flows smoothly to the outer arc surface of the inlet guide cone 9.

[0033] The inner diameter / outer diameter of the intermediate cylinder 31 is equal to 0.7-1.0 times, preferably 0.8-0.95 times, the outer diameter of the inlet guide cone 9, so that the liquid flows smoothly to the outer arc surface of the inlet guide cone 9.

[0034] like Figure 3 As shown, the tail end of the connecting shaft 23 is provided with an arc-shaped part 33, which is located adjacent to the inlet guide cone 9. The arc-shaped part 33 protrudes from the second bearing 24, and the axial gap g2 between the arc-shaped part 33 and the inlet guide cone 9 can be adjusted by the axial position of the outer ring 26, so that the liquid between the arc-shaped part 33 and the inlet guide cone 9 flows smoothly along the outer arc surface of the inlet guide cone 9 to the inlet guide vane 8.

[0035] The axial length of the connecting shaft 23 is greater than the axial length of the intermediate cylinder 31, and the axial length of the intermediate cylinder 31 is greater than the axial length of the rotating guide vane 22.

[0036] This invention discloses a high-efficiency and energy-saving full-flow submersible pump, which is connected to the inlet cylinder 20 and the inlet horn 2 via end face flanges and bolts. The inlet guide assembly is easy to install and disassemble. Through the design of fixed guide vanes 21 and rotating guide vanes 22, the rotating guide vanes 22 are passively rotated under the drive of the liquid, which can improve the liquid flow state at the pump inlet, enhance the cavitation suppression effect, and enable pre-pressurization. Through the design of the local backflow path, it can promote the backflow of corner eddies, reduce impact / collision flow losses, reduce pressure pulsation, and improve the operational stability of the submersible pump.

[0037] This invention discloses a high-efficiency and energy-saving full-flow submersible pump. The inner cylinder 25 has external threads, the outer ring 26 has external threads, and the inlet cylinder 20 has internal threads. The axial positions of the inner cylinder 25 and outer ring 26 relative to the inlet cylinder 20 are adjustable, allowing for adjustment of axial clearances g1, g3, and g2 (i.e., the relative axial position of the outer periphery of the rotating guide vane 22 and the groove 28 is adjustable, the length of the local backflow path is adjustable, and the axial length and volume of the corner region Q are adjustable). For different operating conditions, this design better promotes the backflow of vortices in the corner region, better guides the orderly flow of vortices in the corner region, reduces impact and collision flows and hydraulic losses, reduces pressure pulsation, improves the operational stability of the submersible pump, and also achieves energy-saving effects.

[0038] The present invention uses an intermediate cylinder 31 with an inner diameter greater than the outer diameter of the central ring of the fixed guide vane 21, and an inner diameter / outer diameter ratio of the intermediate cylinder 31 less than or equal to the outer diameter of the inlet guide cone 9, so that the liquid flows smoothly to the outer arc surface of the inlet guide cone 9; the axial position of the outer ring 26 is adjustable so that the axial gap g2 between the arc-shaped part 33 and the inlet guide cone 9 is adjustable, so that the liquid between the arc-shaped part 33 and the inlet guide cone 9 flows smoothly along the outer arc surface of the inlet guide cone 9 to the inlet guide vane 8.

[0039] 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. A high-efficiency and energy-saving full-flow submersible pump, comprising a pump casing, an inlet horn and an outlet horn connected to both ends of the pump casing respectively, a motor stator installed 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 main shaft connected to the inlet guide cone and the outlet guide cone at both ends respectively, an impeller installed in the middle of the main shaft through a first bearing, a motor rotor connected to the outer circumferential surface of the impeller, and a sealing assembly provided between the impeller and the main shaft; Its features are: An inlet guide assembly is installed upstream of the inlet horn. The inlet guide assembly includes an inlet cylinder, which is connected to the inlet horn via an end face flange and bolts. A fixed guide vane and an inner cylinder are connected to the inner circumferential surface of the inlet cylinder. A second bearing is installed in the central ring of the fixed guide vane, and a connecting shaft is installed in the second bearing. A rotating guide vane is connected to the connecting shaft and is passively rotated by the liquid. The outer circumference of the fixed guide vane has an outer ring with multiple axial channels distributed circumferentially inside. A groove is provided on the inner side of the right end of the inner cylinder. A corner area is formed between the right end face of the outer ring and the inlet horn. The top edge of the outer circumference of the rotating guide vane is adjacent to the inner circumferential surface of the inner cylinder and the groove. The corner area is connected to the groove through the axial channels and forms a local backflow at the top edge of the outer circumference.

2. The high-efficiency and energy-saving full-flow submersible pump as described in claim 1, characterized in that, The flow path formed at the outer peripheral top edge of the rotating guide vane is: corner area → axial channel → groove → outer peripheral top edge → outer ring inner peripheral surface → inlet horn.

3. The high-efficiency and energy-saving full-flow submersible pump as described in claim 2, characterized in that, The inner cylinder has an external thread, and the inlet cylinder has an internal thread. The inner cylinder and the inlet cylinder are threaded together so that the axial clearance g1 between the right end face of the inner cylinder and the left end face of the outer ring can be adjusted. The relative axial position of the outer peripheral top edge of the corresponding rotating guide vane and the groove can be adjusted, and the length of the local backflow path can be adjusted.

4. A high-efficiency, energy-saving, full-flow submersible pump as described in claim 2 or 3, characterized in that, The outer ring has an external thread and is threaded to the inlet cylinder, so that the axial clearance g1 between the outer ring and the inner cylinder can be adjusted, the relative axial position of the outer peripheral top edge of the corresponding rotating guide vane and the groove can be adjusted, and the length of the local backflow path can be adjusted; so that the axial clearance g3 between the outer ring and the end face flange of the inlet horn or inlet cylinder can be adjusted, and the axial length and volume of the corresponding corner area can be adjusted.

5. The high-efficiency energy-saving full-flow submersible pump as described in claim 3, characterized in that, The inlet end of the axial channel is provided with a first inclined guide surface, and the inlet end of the groove is provided with a second inclined guide surface to promote the backflow of liquid in the corner area.

6. The high-efficiency and energy-saving full-flow submersible pump as described in claim 3, characterized in that, Relative to the rotation axis of the rotating guide vane, the outer ring has an inner diameter R1, the inner cylinder has an inner diameter R2, the groove has an outer diameter R3, and the axial channel has an outer diameter R4, where R1 < R2 < R3 < R4.

7. The high-efficiency and energy-saving full-flow submersible pump as described in claim 3, characterized in that, An intermediate cylinder is provided on the inner side of the rotating guide vane, and an inner guide vane is fixedly provided on the inner side of the intermediate cylinder. The inner guide vane is fixedly connected to the outer circumferential surface of the connecting shaft. The rotating guide vane and the inner guide vane rotate passively together under the drive of the liquid, thus forming an inner flow channel.

8. The high-efficiency and energy-saving full-flow submersible pump as described in claim 7, characterized in that, The inner diameter of the intermediate cylinder is larger than the outer diameter of the central ring of the fixed guide vane, and the ratio of the inner diameter to the outer diameter of the intermediate cylinder is less than or equal to the outer diameter of the inlet guide cone, so that the liquid flows smoothly to the outer arc surface of the inlet guide cone.

9. A high-efficiency, energy-saving, full-flow submersible pump as described in claim 8, characterized in that, The inner diameter / outer diameter of the intermediate cylinder is equal to 0.7-1 times the outer diameter of the inlet guide cone; the axial length of the connecting shaft is greater than the axial length of the intermediate cylinder, and the axial length of the intermediate cylinder is greater than the axial length of the rotating guide vane.

10. The high-efficiency and energy-saving full-flow submersible pump as described in claim 7, characterized in that, The tail end of the connecting shaft is provided with an arc-shaped part, which is located near the inlet guide cone. The arc-shaped part protrudes from the second bearing and the axial gap g2 between the arc-shaped part and the inlet guide cone can be adjusted by adjusting the axial position of the outer ring, so that the liquid between the arc-shaped part and the inlet guide cone can flow smoothly along the outer arc surface of the inlet guide cone to the inlet guide vane.

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