Permanent magnet power generation recycling circulating water redundant energy inclined entry type water turbine

Abstract

This invention proposes a permanent magnet turbine for recovering redundant potential energy from circulating water, comprising four parts: a guide section, a power section, a tailrace section, and a support section. The guide section includes a volute, guide vanes, an outer guide ring, and an inner guide ring. The power section includes a runner and a main shaft. The support section includes a volute, a bearing base, a bearing support, and a bearing cover. The tailrace section includes a tailrace pipe and a tailrace cone. This invention relates to the field of energy conversion device technology. The unit of this invention has a compact and efficient structure with wide applicability. Developed to meet the environmental requirements of circulating water workshops in chemical plants, this permanent magnet turbine for recovering redundant potential energy from circulating water adopts a circumferential inflow and oblique annular outflow pattern, significantly reducing the radial dimension of the turbine. It has a long operating time and wide applicability, especially suitable for the short operating time of electric fans in mechanically forced-draft cooling towers in northern my country.

Description

Technical Field

[0001] This invention relates to the field of energy conversion device technology, specifically to a device that efficiently converts the redundant potential energy of industrial circulating water into rotational mechanical energy, and then converts the rotational mechanical energy into electrical energy through a permanent magnet generator directly connected to it. Background Technology

[0002] In large and extra-large enterprises such as petrochemical and metallurgical plants, centralized circulating cooling water systems are mostly used to reduce the temperature of the working fluid: low-enthalpy circulating water pumped out by the circulating water pump is transported to various heat exchangers in the enterprise through the main water supply pipe. In the heat exchangers, it completes heat exchange with the working fluid (the circulating water and the working fluid only exchange heat), becoming high-enthalpy circulating water, which then flows into the return water main pipe. From there, it is transported to various mechanically ventilated cooling towers to exchange heat with the atmospheric environment, and then returns to the circulating water pump to complete a closed loop. Due to the enterprise's production... Due to production process requirements, there are different elevation differences between the circulating water outlets of each heat exchanger and the spray nozzles of the cooling tower. This elevation difference minus the energy loss of the water in the connecting pipes between the heat exchanger and the cooling tower spray nozzles is the "redundant potential energy" of the heat exchanger. The "redundant potential energy" per unit fluid is called the "redundant potential energy head". The largest "redundant potential energy head" among all heat exchangers in the enterprise is the "redundant potential energy head" of the enterprise's circulating water system. The product of this head and the total flow rate of the circulating water in the system is the "redundant potential energy" of the circulating system.

[0003] Due to differences in production content, geographical location, and changing production tasks, the redundant potential energy of a company's circulating water system varies. Even within the same company, the redundant potential energy changes seasonally. Therefore, the turbine-generator unit responsible for recovering the redundant potential energy of the circulating water system must also adapt to these system variations. To fully recover the redundant potential energy of the circulating water system, a turbine-driven permanent magnet generator connected coaxially is used. The generated electricity is then sent back to the circulating water plant's power grid via a rectifier and inverter. The unit operates at variable speeds according to the company's actual operating conditions, without human intervention. By automatically adjusting the inverter's output current on the grid side, the unit's variable speed operation ensures that the turbine always recovers the redundant potential energy of the circulating water system with maximum efficiency.

[0004] To make the turbine as compact as possible, it is designed as an inclined-entry turbine, with the turbine casing using a circumferential water inlet and inclined circular water outlet. The generator set is installed on the ground next to the water supply pipe on the upper part of the cooling tower, with the water supply pipe bypassed to the turbine. A permanent magnet generator is used to improve the efficiency of the recovery unit, eliminating the need for the excitation system of a conventional generator. A rectifier and inverter converter is used to enable the unit to efficiently generate standard power frequency electricity even when operating at variable speeds, adapting to changes in the circulating water system. A converter regulation is used to adjust the generator output power according to the actual operating head changes of the turbine, allowing the unit to always operate at its designed efficiency within a certain range.

[0005] Therefore, by changing the traditional design method of water turbines and designing a compact, high-efficiency, direct-drive permanent magnet generator to generate electricity, and then using a water turbine permanent magnet generator set that is rectified, inverted, and controlled by converter to be connected to the grid, a high-efficiency, unattended, variable-speed, constant-frequency unit that can adapt to changes in the circulating water system can recover the "redundant potential energy" of the circulating water system without changing the traditional electric drive fan of the cooling tower. This not only reduces the electricity cost of enterprise production, but also achieves the goals of energy saving and emission reduction.

[0006] Applying a permanent magnet turbine generator to recover redundant potential energy from circulating water in rural small hydropower ecological water flow discharge allows for the recovery of ecological water flow energy without human intervention. This not only meets the discharge requirements of small hydropower ecological water flow but also increases the additional power generation capacity and revenue of small hydropower plants.

[0007] Applying permanent magnet generators to recover redundant potential energy from circulating water in inclined turbine units to serve as backup power for large hydropower stations, and utilizing the "energy storage" characteristics of permanent magnet generators, allows for manual opening of the unit's water supply valve to generate electricity when there is no power supply available. This solves the backup power problem for large hydropower stations, is safe and reliable, has extremely low maintenance costs, and offers good economic and social benefits. Summary of the Invention

[0008] The purpose of this invention is to provide a permanent magnet power generation and recycling circulating water redundant potential energy inclined water turbine, so as to solve the problems mentioned in the background art and overcome its technical defects.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a permanent magnet power generation and recycling circulating water redundant potential energy inclined-entry turbine, comprising four parts: a guide section, a power section, a tailrace section, and a support section. The guide section includes a volute, guide vanes, an outer guide ring, and an inner guide ring. The power section includes a runner and a main shaft. The support section includes a volute, a bearing base, a bearing support, and a bearing cover. The tailrace section includes a tailrace pipe and a tailrace cone. The volute receives water circumferentially through a circular inlet channel and discharges water obliquely through a slanted annular outlet. One side of the outlet is fixedly connected to an outer guide ring via an outer connecting ring, a front flange, and bolts. The other side of the outlet is fixedly connected to a bearing base via an inner connecting ring, a middle connecting end, and bolts. A rear flange is provided on one side of the outer guide ring, and the rear flange is connected to the flange of the tailpipe via bolts. The inner guide ring is bolted to one side of the guide ring connection end on the bearing base. The guide vane body is embedded in the cavity formed by the outer guide ring and the outer ring body on one side of the bearing base and is fixed by the inner guide ring. The runner body is keyed to the turbine connection end on one side of the main shaft. The generator connection end on one side of the main shaft is fixedly connected to the main shaft coupling of the permanent magnet generator by a key. The main shaft is installed in the front bearing chamber and the rear bearing chamber of the bearing base by a pair of bearings respectively, and the bearing support is fixed to the front bearing connection screw hole of the bearing base by bolts. The bearing support is bolted to a connecting disc, and the spokes extending from the connecting disc are welded to the outer wall of the volute. The bearing cover is bolted to the rear bearing connection screw hole.

[0010] As a further embodiment of the present invention: a permanent magnet power generation and recycling circulating water redundant potential energy inclined water turbine, wherein the inlet flow channel of the volute is circular and a flange is welded to the outer end, the volute is connected to the water inlet pipe through the flange, and the water in the water inlet pipe is introduced into the volute and rotates around the main shaft in the volute to form part of the fluid circulation required to do work, the flow channel cross section provided on one side of the volute is a full circular cross section with a gradually changing diameter, the water outlet is an inclined annular shape at a 60-degree angle with the main shaft direction, and the fluid outflow direction of the water outlet is an inclined rotating outflow at a 30-degree angle with the main shaft; The outer connecting ring is provided with an outer sealing ring and an outer screw hole, and the outer connecting ring is fixedly connected to the front flange in the outer guide ring by bolts in the outer screw hole and sealed by O-rings in the outer sealing ring. The inner connecting ring on the inner side of the outlet is provided with an inner sealing ring and an inner screw hole, and the inner connecting ring is connected to the middle connecting end of the bearing base by bolts in the inner screw hole and sealed by O-rings in the inner sealing ring. The oblique annular outlet overlaps with the oblique annular inlet of the guide vane and has the same width; the connecting surfaces of the outer connecting ring and the inner connecting ring are oblique annular surfaces parallel to the outlet.

[0011] As a further embodiment of the present invention: a permanent magnet power generation and recycling circulating water redundant potential energy inclined inlet turbine, wherein the guide vane body is a flow channel with a quasi-circular structure composed of an outer ring of the guide vane body, an inner ring of the guide vane body, and a guide vane grid, wherein the outer ring of the guide vane body and the inner ring of the guide vane body are quasi-circular structures with different diameters, the outer side of the guide vane grid is welded to the outer ring of the guide vane body, the inner side of the guide vane grid is welded to the inner ring of the guide vane body, the inlet side of the guide vane grid is the inlet end of the guide vane body and is coplanar with the inclined annular outlet of the volute, the outlet is where pressurized fluid enters the guide vane grid tangentially, the outlet side of the guide vane grid is the outlet end of the guide vane body, and the fluid can continue to accelerate in the guide vane grid and then flow out at the outlet end of the guide vane body to enter the "free space" between the guide vane body and the turbine body; The outer ring of the guide vane is embedded in the guide vane cavity formed by the outer guide ring and the guide vane cavity wall. The inner ring of the guide vane is embedded in the outer ring body inside the bearing base and is pressed and fixed at the inner guide ring at the connection end of the bearing base and the guide ring by bolts. The guide vane grid of the guide vane body is composed of seventeen guide vanes arranged in a circumferential array along the main axis. Each guide vane has the same three-dimensional twisted airfoil structure, wherein: The outer wing has a relative thickness of 8.54%, a relative camber of 5.47%, an inlet installation angle of 52.92 degrees, an outlet installation angle of 34.86 degrees, and an ellipse with a minor axis ratio of 3:1 and a minor axis length of 10 mm at the leading edge and a circular shape with a diameter of 3 mm at the trailing edge. The relative thickness of the inner side of the wing is 10.79%, the relative curvature of the inner side of the wing is 2.79%, the inlet installation angle of the inner side of the wing is 44.34 degrees, the outlet installation angle is 36.77 degrees, the leading edge of the inner side of the wing is an ellipse with a major-to-minor axis ratio of 3:1 and a minor axis length of 8mm, and the trailing edge of the outer side of the wing is a circle with a diameter of 3mm.

[0012] As a further embodiment of the present invention: a permanent magnet power generation and recycling circulating water redundant potential energy inclined turbine, wherein the outer guide ring is a wide-mouthed quasi-circular structure, consisting of a front flange, a rear flange, a guide vane body cavity wall, a runner chamber wall, and a sealing groove. The front flange is bolted to the outer bolt hole on one side of the outer connecting ring and sealed by the outer sealing ring. The rear flange is bolted to the flange of the tailrace pipe and sealed by the sealing groove. The outer ring of the guide vane body is placed in the cavity enclosed by the guide vane body cavity wall. The cavity enclosed by the runner chamber wall is the working chamber of the turbine runner.

[0013] As a further embodiment of the present invention: a permanent magnet power generation and recycling circulating water redundant potential energy inclined-entry turbine, wherein the runner body is composed of a runner bushing, a runner hub, a blade grid and a tailrace cone, wherein: The runner bushing is a cylindrical ring-like body with a six-sided bushing, consisting of a fixing screw hole, a mechanical seal retaining ring, and a main shaft hole. The six-sided bushing is tightly fitted with the six-sided bushing of the runner hub. The main shaft hole is installed on the turbine end of the turbine main shaft via a standard key. The runner hub consists of a six-sided hub, a blade shank hole, and a screw hole. The six-sided hub and the six-sided bushing are tightly fitted. The blade shank hole is the placement position of the blade shank of the blade rack and is fixed by a nut at the top of the blade shank. The runner bushing, the tailrace cone, and the runner hub are fixed together by screw holes. The blade grid consists of six identical blade bodies, each blade body consisting of a blade shank and a blade surface. The blade shank is installed in the blade shank hole of the runner hub and fixed by a nut at the top of the blade shank. The tailrace cone consists of a conical tailrace guide, a tailrace disc, and a fixing hole. The tailrace guide is welded to the tailrace disc and fixed to the runner hub by bolts through the fixing hole. The blade cascade consists of six identical blades arranged in a circular array around the main axis. Each blade has the same three-dimensional twisted airfoil structure, wherein: The outer wing has a relative thickness of 5.72%, a relative camber of 0.64%, an inlet installation angle of 18.11 degrees, an outlet installation angle of 14.65 degrees, and an ellipse with a minor axis ratio of 3:1 and a minor axis length of 15 mm at the leading edge and a circular shape with a diameter of 3 mm at the trailing edge. The relative thickness of the inner side of the wing is 14.31%, the relative curvature of the inner side of the wing is 9.09%, the inlet installation angle of the inner side of the wing is 66.36 degrees, the outlet installation angle is 32.27 degrees, the leading edge of the inner side of the wing is an ellipse with a major-to-minor axis ratio of 3:1 and a minor axis length of 16mm, and the trailing edge of the inner side of the wing is a circle with a diameter of 3mm.

[0014] As a further embodiment of the present invention: a permanent magnet power generation and recycling circulating water redundant potential energy inclined turbine, wherein the bearing base is an irregular cylindrical structure, consisting of a front bearing connecting screw hole, a front bearing chamber, an outer ring body, a middle connecting end, a guide ring connecting end, a rear bearing connecting screw hole, and a rear bearing chamber; the front bearing connecting screw hole is bolted to the bearing support welded to the outer wall of the volute, the middle connecting end is bolted to the inner connecting ring of the volute, a guide vane is placed in the cavity formed by the outer ring body and the outer guide ring, the guide ring connecting end is bolted to the inner guide ring and the guide vane is fixed by the inner guide ring, wherein the bearing cover is assembled with the rear bearing connecting screw hole by bolts, and a pair of thrust bearings are installed in the front bearing chamber and the rear bearing chamber, the thrust bearings being used for positioning the turbine main shaft.

[0015] As a further embodiment of the present invention: a permanent magnet power generation and recycling circulating water redundant potential energy inclined-entry turbine, wherein the turbine main shaft is composed of a generator connection end, a front mechanical seal end, a front bearing end, a rear bearing end, a rear mechanical seal end, a turbine connection end, and turbine fixing bolts. The generator connection end is connected to the generator main shaft coupling via a standard key. The front mechanical seal end and the bearing-supported mechanical seal end form a mechanical seal cavity for installing the mechanical seal. The front bearing end and the front bearing chamber form a cavity for installing the turbine's front thrust bearing. The rear bearing end and the rear bearing chamber form a cavity for installing the turbine's rear thrust bearing. The rear mechanical seal end and the mechanical seal retaining ring form an open space for housing the turbine's rear mechanical seal. The turbine connection end is installed together with the main shaft hole of the runner shaft sleeve via a standard key with an interference fit and is secured by the nut of the turbine fixing bolts.

[0016] As a further embodiment of the present invention: a permanent magnet power generation and recycling circulating water redundant potential energy inclined water turbine, wherein the bearing support is a disc-like structure, consisting of a front mechanical seal cavity, a bearing fixing hole and a connecting screw hole, wherein the front mechanical seal cavity and the front mechanical seal end provided on one side of the main shaft form a cavity for installing the front mechanical seal of the water turbine, the bearing fixing hole is installed in the front bearing connecting screw hole provided on one side of the bearing base by bolts, the connecting screw hole is connected to the connecting plate by bolts, and the spokes extending from the connecting plate are welded to the outer wall of the volute.

[0017] As a further embodiment of the present invention: a permanent magnet power generation and recycling circulating water redundant potential energy inclined turbine, wherein the bearing cover is a disc-like structure, consisting of a bearing cover connecting hole and a rear mechanical seal cavity, wherein the bearing cover is fixed to the bearing base by bolts through the bearing cover connecting hole and the rear bearing connecting screw hole provided on one side of the bearing base, and the rear mechanical seal cavity and the mechanical seal retaining ring provided on one side of the runner shaft sleeve form an open cavity for installing the rear mechanical seal.

[0018] As a further embodiment of the present invention: a permanent magnet power generation and recycling circulating water redundant potential energy inclined turbine, wherein the inner guide ring is a device composed of a fixing hole, a mating surface and a guide ring surface, which is fixed to the guide ring connecting end provided on one side of the bearing base by bolts, and the mating surface presses against the inner ring of the guide vane body provided on one side of the guide vane body; the guide ring surface provided on one side of the inner guide ring, together with the outer ring of the guide vane body, the inner ring of the guide vane body, the runner chamber wall provided on one side of the outer guide ring, and the outer surface of the runner hub provided on one side of the runner body, together form a funnel-shaped semi-circular flow channel, wherein the inlet of the flow channel starts from the annular outlet of the volute, the center streamline of the flow channel inlet forms a 30-degree angle with the turbine main shaft, and the outlet of the flow channel is at the outlet of the blade grid of the runner body, the center streamline of the flow channel outlet forms a zero-degree angle with the turbine main shaft.

[0019] Compared with the prior art, the beneficial effects of the present invention include: (1) The unit has a compact and efficient structure and a wide range of applications. The permanent magnet generator that recovers the redundant potential energy of the circulating water in the chemical plant's circulating water workshop was developed to meet the environmental requirements. It adopts a circumferential inflow and oblique circular outflow mode, which greatly reduces the radial dimension of the turbine. It has a long operating time and a wide range of applications, especially suitable for the short operating time of the electric fan of the mechanical forced ventilation cooling tower in northern my country.

[0020] (2) The unit has a simple structure, low cost, and adapts to changes in operating conditions. The permanent magnet generator recovers the redundant potential energy of the circulating water in an inclined turbine, which, together with the permanent magnet generator, rectifier, inverter, and converter, forms a complete adaptive turbine generator unit. It can operate at different speeds according to changes in the circulating water flow and redundant potential energy head. The non-power frequency AC power generated by the permanent magnet generator is rectified and then inverted according to the power grid side signal to output standard AC power, which is connected to the power grid through the converter. This eliminates the need for the "excitation system" and "speed regulation system" of conventional hydropower units, and achieves variable speed constant frequency power generation without excitation or regulation.

[0021] (3) High-efficiency and variable-speed operation under wide-range water head changes; the permanent magnet power generation and recycling circulating water redundant potential energy inclined turbine developed adjusts the converter output current according to the change of redundant potential energy head of the circulating water system, and then adjusts the unit speed so that when the water head of the turbine changes, the unit adjusts the converter output current to control the unit speed under the condition of balancing the output power of the turbine and the output power of the generator, so that the unit always works in the optimal design condition and achieves variable-speed and constant-frequency power generation.

[0022] (4) Unattended and highly efficient adaptive operation: The permanent magnet generator unit that recovers redundant potential energy of circulating water can achieve unattended "fully automatic, high efficiency and adaptive" working mode by measuring the pressure difference, speed and output power of the inlet and outlet water turbines in real time, and controlling the working status, start-up and shutdown and protection of the generator unit in real time through the control device at the converter end. This reduces operating costs and has broad application prospects and promotion value.

[0023] (5) Applicable to the energy recovery of “ecological water flow” in rivers with hydropower stations. The permanent magnet power generation and circulating water redundant potential energy inclined turbine unit developed is applied to the energy recovery of “ecological water flow” in rivers with hydropower stations. The unit speed is adjusted according to the water level difference before and after the unit. Under the premise of meeting the requirements of releasing “ecological flow”, the energy of the water body is recovered as efficiently as possible, which is also a considerable benefit to the hydropower station, especially rural small hydropower.

[0024] (6) As a backup power source for large and medium-sized hydropower plants, the permanent magnet generator recovering the redundant potential energy of the circulating water inclined turbine unit developed is used in large hydropower plants as a "backup power source". Utilizing the "energy storage" effect of the permanent magnet generator, when the hydropower plant is completely cut off from the outside world, the water supply pipeline of the turbine unit can be manually opened to generate qualified AC power. It can replace the "battery group" and "diesel generator group" that are commonly used in hydropower plants as backup power sources. It is safe, reliable, maintenance-free, and widely adaptable, and has high efficiency, safety and explosion-proof characteristics. Attached Figure Description

[0025] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 The schematic diagram shows a permanent magnet power generation and recycling of redundant potential energy of circulating water inclined turbine structure according to an embodiment of the present invention; Figure 2 The schematic diagram shows a volute structure according to an embodiment of the present invention, wherein part A is a top view and part B is an axial sectional view; Figure 3 The schematic diagram shows a guide vane structure according to an embodiment of the present invention, wherein part A is an axial sectional view and part B is a front view; Figure 4 The schematic diagram shows a water turbine guide vane structure according to an embodiment of the present invention; Figure 5 The schematic diagram shows a schematic representation of an outer flow guide ring structure according to an embodiment of the present invention; Figure 6 The schematic diagram shows a rotary body structure according to an embodiment of the present invention, wherein part A is a axial sectional view and part B is a front view; Figure 7 The schematic diagram shows a rotary shaft sleeve structure according to an embodiment of the present invention, wherein part A is a front view and part B is a axial sectional view; Figure 8 The schematic diagram shows a rotor hub structure according to an embodiment of the present invention, wherein part A is a front view and part B is an axial sectional view; Figure 9 A schematic diagram of a three-dimensional blade body according to an embodiment of the present invention is shown. Figure 10 The schematic diagram shows a tailrace cone structure according to an embodiment of the present invention, wherein part A is a front view and part B is an axial sectional view; Figure 11 The schematic diagram shows a water turbine runner blade structure according to an embodiment of the present invention; Figure 12 The schematic diagram shows a bearing base structure according to an embodiment of the present invention, wherein part A is a axial sectional view and part B is a front view; Figure 13 A schematic diagram of a spindle structure according to an embodiment of the present invention is shown. Figure 14The schematic diagram shows a bearing support structure according to an embodiment of the present invention, wherein part A is a axial sectional view and part B is a front view; Figure 15 The schematic diagram shows a bearing cover structure according to an embodiment of the present invention, wherein part A is a axial sectional view and part B is a front view; Figure 16 The schematic diagram shows an inner guide ring structure according to an embodiment of the present invention, where A is an axial sectional view and B is a front view. Labels in the diagram: 1. Volute; 2. Guide vane; 3. Outer guide ring; 4. Tailwater cone; 5. Tailwater pipe; 6. Runner; 7. Inner guide ring; 8. Bearing base; 9. Main shaft; 10. Bearing support; 11. Bearing cover; 12. Outlet; 13. Outer connecting ring; 14. Inner connecting ring; 15. Flow channel cross-section; 16. Outer sealing ring; 17. Inner sealing ring; 18. Inner screw hole; 19. Outer... 20. Screw hole; 21. Inlet flow channel; 22. Flange; 23. Guide vane body inlet end; 24. Guide vane inner ring; 25. Guide vane outer ring; 26. Guide vane flange; 27. Guide vane body outlet end; 28. Front flange; 29. ​​Guide vane body cavity wall; 30. Runner chamber wall; 31. Rear flange; 32. Sealing groove; 33. Runner shaft sleeve; 34. Runner hub; 35. Blade flange; 36. Tailwater cone; 37. Main shaft hole; 38. Shaft sleeve 38. Hexagonal column; 39. Runner hub; 40. Mechanical seal retaining ring; 41. Hub hexagonal column; 42. Blade shank hole; 43. Screw hole; 44. Blade shank; 45. Blade body; 46. Tailwater guide; 47. Tailwater plate; 48. Fixing hole; 49. Front bearing connecting screw hole; 50. Front bearing housing; 51. Outer ring body; 52. Middle connecting end; 53. Guide ring connecting end; 54. Rear bearing connecting screw hole; 55. Rear bearing housing; 56. Generator connection end; 57. Front mechanical seal end; 58. Front bearing end; 59. Rear bearing end; 60. Rear mechanical seal end; 61. Turbine connection end; 62. Turbine fixing bolt; 63. Front mechanical seal cavity; 64. Bearing fixing hole; 65. Connecting bolt hole; 66. Bearing cover connecting hole; 67. Rear mechanical seal cavity; 68. Fixing hole; 69. Mating surface; 60. Guide ring surface. Detailed Implementation

[0026] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0027] An embodiment of the present invention is illustrated in conjunction with the accompanying drawings.

[0028] This invention relates to a permanent magnet generator-driven inclined-entry turbine designed to recover redundant potential energy from circulating water. The turbine is designed for use in centralized circulating cooling water systems in large and extra-large petrochemical and metallurgical enterprises in my country, which typically employ mechanical ventilation cooling towers with a cooling water capacity of 4000-5000 tons per hour. Its axial length is 1.955 meters, maximum radial length is 1.839 meters, design speed is 500 rpm, turbine design head is 9.5 meters, and design flow rate is [not specified]. The turbine has a flow rate of 1.25 cubic meters per second, a turbine efficiency of 90%, a turbine specific speed of 306.8 m·kW, and a turbine shaft power of 104.7 kW, which meets the design requirements.

[0029] like Figure 1 As shown, the permanent magnet generator recovers redundant potential energy from the circulating water in an inclined-entry turbine, which consists of four parts: a guide section, a power section, a tailrace section, and a support section.

[0030] The flow guide section includes a volute 1, a guide vane 2, an outer flow guide ring 3, and an inner flow guide ring 7.

[0031] The working section includes the rotor body 6 and the main shaft 9.

[0032] The support section includes a volute 1, a bearing base 8, a bearing support 10, and a bearing cover 11.

[0033] The tailrace section includes tailrace pipe 5 and tailrace cone 4.

[0034] Each flow section 15 of the volute 1 is a circular section with a gradually changing area. The outer connecting ring 13 outside the outlet 12 is connected to the front flange 27 of the outer guide ring 3 by bolts and sealed by an O-ring in the outer sealing groove 16. The inner connecting ring 14 inside the outlet 12 of the volute 1 is connected to the middle connecting end 51 of the bearing base 8 by bolts and sealed by an O-ring in the inner sealing groove 17. The guide vane 2 is embedded in the guide vane cavity wall 28 of the outer guide ring 3 and the outer ring 50 of the bearing base 8. Within the cavity, the inner guide ring 7 is fixed by bolts to the guide ring connection end 52 of the bearing base 8; the pressurized water entering through the circular inlet channel 20 of the volute 1 flows in the cross section 15 of the volute 1 channel, flows out at a 30-degree angle to the turbine main shaft 9 through the annular outlet 12 of the volute 1, enters the flow channel composed of the outer ring 24, inner ring 23, and guide vane grid 25 of the guide vane body 2, and cuts into the inlet end of the guide vane grid 25, accelerates within the flow channel of the guide vane body 2, and then passes through the... The free space between the turbine runners 6 accelerates, tangentially impacting the blade grid 34 of the runner 6, driving the turbine runner 6 to rotate. Within the blade grid 34, the water energy is converted into the rotational mechanical energy of the runner 6. The runner chamber wall 29 of the outer guide ring 3 and the outer ring-like surface of the runner hub 33 of the runner 6 form the working chamber of the runner 6. The fluid flowing out of the runner 6 axially enters the tailrace pipe 5. To minimize vortices in the tailrace pipe, the diffusion angle of the outer wall of the tailrace pipe 5 is designed at 6.5 degrees. The lower end of the turbine runner 6 is designed with a tailrace cone 35. The runner body 6 is fixed to the turbine connection end 60 of the turbine main shaft 9 by a standard key and a locking nut. The main shaft 9 is axially and radially positioned by the thrust bearings in the front bearing chamber 49 and rear bearing chamber 54 of the bearing base 8 through the front bearing end 57 and the rear bearing end 58, respectively, and by the bearing cover 11 and bearing support 10 installed in the bearing base 8 by bolts. The water energy converted by the turbine runner body 6 is output through the generator connection end 55 of the main shaft 9.

[0035] like Figure 2As shown, the volute 1 is a volute structure with a 15mm thick cast steel core and a fully circular flow channel with oblique outflow. The inlet flow channel 20 of the volute 1 is circular, and the outer end is welded with a flange 21, which is connected to the inlet pipe by bolts through the flange 21. The outlet 12 of the volute 1 is an oblique annular shape with a 60-degree angle to the direction of the main shaft (9). The fluid outflow direction of the outlet 12 is an oblique rotational outflow with a 30-degree angle to the main shaft 9. The outer connecting ring 13 outside the outlet 12 of the volute 1 is provided with an outer sealing groove 16 and an outer screw hole 19. The outer connecting ring 13 is connected to the outer guide ring 3 through the bolt in the outer screw hole 19. The front flange 27 is connected and sealed by an O-ring in the outer sealing groove 16; the inner connecting ring 14 inside the outlet 12 of the volute 1 is provided with an inner sealing groove 17 and an inner screw hole 18. The inner connecting ring 14 is connected to the middle connecting end 51 of the bearing base 8 by a bolt in the inner screw hole 18 and sealed by an O-ring in the inner sealing groove 17; the oblique annular outlet 12 of the volute 1 overlaps with the oblique annular guide vane inlet 22 of the guide vane body 2 and has the same width; the connecting surfaces of the outer connecting ring 13 and the inner connecting ring 14 of the volute 1 are oblique annular surfaces parallel to the outlet 12 of the volute 1.

[0036] like Figure 3 As shown, the guide vane body 2 is a flow channel with a near-circular structure consisting of an outer ring 24, an inner ring 23, and a guide vane grid 25. It is made of stainless steel. The outer side of the guide vane grid 25 is welded to the outer ring 24, and the inner side is welded to the inner ring 23. The inlet side of the guide vane grid 25 is the guide vane body inlet end 22, which is coplanar with the oblique annular outlet 12 of the volute 1. The outlet side of the guide vane grid 25 is the guide vane body outlet end 26. The outer ring 24 is embedded in the guide vane body cavity formed by the guide vane body cavity wall 28 of the outer guide ring 3. The inner ring 23 is embedded in the outer ring 50 of the bearing base 8 and is pressed and fixed by the inner guide ring 7, which is bolted to the lower connecting end 52 of the bearing base 8.

[0037] like Figure 4 As shown, the guide vane grating 25 of the guide vane body 2 consists of 17 guide vanes arranged in a circular array along the main axis 9. Each guide vane has the same three-dimensional twisted airfoil structure. The outer relative thickness is 8.54%, the outer relative curvature is 5.47%, the outer inlet installation angle is 52.92 degrees, and the outer outlet installation angle is 34.86 degrees. The outer leading edge is an ellipse with a major-to-minor axis ratio of 3:1 and a minor axis length of 10 mm, and the outer trailing edge is a circle with a diameter of 3 mm. The inner relative thickness is 10.79%, the inner relative curvature is 2.79%, the inner inlet installation angle is 44.34 degrees, and the outlet installation angle is 36.77 degrees. The inner leading edge is an ellipse with a major-to-minor axis ratio of 3:1 and a minor axis length of 8 mm, and the outer trailing edge is a circle with a diameter of 3 mm.

[0038] like Figure 5As shown, the outer guide ring 3 is a wide-mouthed, ring-like structure made of ordinary carbon steel with a thickness of 15mm. It consists of a front flange 27, a rear flange 30, a guide vane body cavity wall 28, a runner chamber wall 29, and a sealing groove 31. The front flange 27 is bolted to the outer bolt hole 19 of the outer connecting ring 13 of the volute 1 and sealed by the outer sealing ring 16 of the volute 1. The rear flange 30 is bolted to the flange of the tailrace pipe 5 and sealed by the sealing groove 31. The outer ring 24 of the guide vane body 2 is placed in the cavity enclosed by the guide vane body cavity wall 28. The cavity enclosed by the runner chamber wall 29 is the working chamber of the turbine runner body 6.

[0039] like Figure 6 , 7 As shown in Figures 8, 9, and 10, the turbine runner 6 is composed of a runner bushing made of ordinary cast steel, a runner hub 33 made of stainless steel, a blade grid 34 made of stainless steel, and a tailrace cone 35 made of ordinary carbon steel. Among them, the runner bushing 32 is a cylindrical ring-like body with a bushing hexagonal column 37, which is composed of a fixing screw hole 38, a mechanical seal retaining ring 39, and a main shaft hole 36. The bushing hexagonal column 37 is tightly fitted with the hub hexagonal column 40 of the runner hub 33. The main shaft hole 36 is installed at the turbine end of the turbine main shaft 9 by a standard key. The runner hub 33 consists of a hub hexagonal column 40, a blade shank hole 41, and a screw hole 42. The hub hexagonal column 40 is tightly fitted with the bushing hexagonal column 37. The blade shank hole 41 is the placement position for the blade shank 43 of the blade grid 34, which is fixed by a nut at the top of the blade shank. The runner bushing 32, the tailrace cone 35, and the runner hub 33 are fixed together by bolts in the screw hole 42. The blade grid 34 consists of six identical blade bodies. Each blade body consists of a blade shank 43 and a blade surface 44. The blade shank 43 is installed in the blade shank hole 41 of the runner hub 33 and fixed by a nut at the top of the blade shank 43. The tailrace cone 35 consists of a conical tailrace guide 45, a tailrace plate 46, and a fixing hole 47. The tailrace guide 45 is welded to the tailrace plate 46 and fixed to the runner hub 33 by bolts through the fixing hole 47.

[0040] like Figure 11As shown, the stainless steel blade array 34 consists of six identical blades arranged in a circular array around the main axis 9. Each blade surface 44 has the same three-dimensional twisted airfoil structure. The outer relative thickness is 5.72%, the outer relative camber is 0.64%, the outer inlet installation angle is 18.11 degrees, and the outer outlet installation angle is 14.65 degrees. The outer leading edge is an ellipse with a major-to-minor axis ratio of 3:1 and a minor axis length of 15 mm, and the outer trailing edge is a circle with a diameter of 3 mm. The inner relative thickness is 14.31%, the inner relative camber is 9.09%, the inner inlet installation angle is 66.36 degrees, and the outlet installation angle is 32.27 degrees. The inner leading edge is an ellipse with a major-to-minor axis ratio of 3:1 and a minor axis length of 16 mm, and the inner trailing edge is a circle with a diameter of 3 mm.

[0041] like Figure 12 As shown, the bearing base 8 is an irregular cylindrical structure made of ordinary cast steel, and consists of a front bearing connecting screw hole 48, a front bearing chamber 49, an outer ring body 50, a middle connecting end 51, a guide ring connecting end 52, a rear bearing connecting screw hole 53, and a rear bearing chamber 54. The front bearing connecting screw hole 48 is bolted to the bearing support 10 welded to the outer wall of the volute. The middle connecting end 51 is bolted to the inner connecting ring 14 of the volute 1. The guide vane 2 is placed in the cavity formed by the outer ring body 50 and the outer guide ring 3. The guide ring connecting end 52 is bolted to the inner guide ring 7, and the inner guide ring 7 fixes the guide vane 2. The bearing cover 11 is bolted to the rear bearing connecting screw hole 53. A pair of thrust bearings are installed in the front bearing chamber 49 and the rear bearing chamber 54 for positioning the turbine main shaft 9.

[0042] like Figure 13 As shown, the turbine main shaft 9 is a columnar structure forged from manganese steel, consisting of a generator connection end 55, a front mechanical seal end 56, a front bearing end 57, a rear bearing end 58, a rear mechanical seal end 59, a turbine connection end 60, and a turbine fixing bolt 61. The generator connection end 55 is connected to the generator main shaft coupling via a standard key. The front mechanical seal end 56 and the mechanical seal end 62 of the bearing support 10 form a mechanical seal cavity for installing the mechanical seal. The front bearing end 57 and the front bearing chamber 49 of the bearing base 8 form a cavity for installing the turbine's front thrust bearing. The rear bearing end 58 and the front bearing chamber 54 of the bearing base 8 form a cavity for installing the turbine's rear thrust bearing. The rear mechanical seal end 59 and the mechanical seal retaining ring 39 of the runner body 6 form an open space for installing the turbine's rear mechanical seal. The turbine connection end 60 is installed together with the main shaft hole 36 of the runner shaft sleeve 32 of the runner body 6 via a standard key and is secured by the nut of the turbine fixing bolt 61.

[0043] like Figure 14As shown, the bearing support 10 is a disc-like structure made of ordinary carbon steel, consisting of a front mechanical seal cavity 62, a bearing fixing hole 63, and a connecting screw hole 64. The front mechanical seal cavity 62 and the front mechanical seal end 56 of the main shaft 9 form a cavity for installing the front mechanical seal of the turbine. The bearing fixing hole 63 is installed in the front bearing connecting screw hole 48 of the bearing base 8 by bolts. The connecting screw hole 64 is connected to the connecting plate by bolts. The spokes extending from the connecting plate are welded to the outer wall of the volute 1.

[0044] like Figure 15 As shown, the bearing cover 11 has a disc-like structure and is made of ordinary carbon steel. It consists of a bearing cover connecting hole 65 and a rear mechanical seal cavity 66. The bearing cover 11 is fixed to the bearing base 8 by bolts through the bearing cover connecting hole 65 and the rear bearing connecting screw hole 53 of the bearing base 8. The rear mechanical seal cavity 66 and the mechanical seal retaining ring 39 of the rotor shaft sleeve 32 of the rotor body 6 form an open cavity for installing the rear mechanical seal.

[0045] like Figure 16 As shown, the inner guide ring 7 is made of ordinary carbon steel and is a device consisting of a fixing hole 67, a mating surface 68 and a guide ring surface 69. It is fixed to the guide ring connection end 52 of the bearing base 8 by bolts, and the mating surface 68 presses against the inner ring 23 of the guide vane body 2. The guide ring surface 69 of the inner guide ring 7, together with the outer ring 24 of the guide vane body 2, the inner ring 23 of the guide vane body 2, the impeller chamber wall 29 of the outer guide ring 3, and the outer surface of the impeller hub 33 of the impeller body 6, form a funnel-shaped annular flow channel.

[0046] In summary, this invention utilizes circulating water with a certain head and flow rate from a chemical plant, possessing "redundant potential energy," to drive a permanent magnet generator to recover the redundant potential energy of the circulating water. This turbine, driven by a permanent magnet generator coaxial with the turbine, rotates, generating AC power (generally non-power frequency) which is rectified and inverted into power frequency AC power. The output current is then regulated by a converter and fed into the grid. This process recovers the redundant potential energy of the circulating water system as standard electrical energy, which is technically feasible and has the following advantages: (1) The unit has a compact and efficient structure and a wide range of applications, especially suitable for the short running time of electric fans in mechanical forced ventilation cooling towers in northern my country; (2) The unit has a simple structure, low cost, and adapts to changes in operating conditions. It eliminates the need for the "excitation system" and "speed regulation system" of conventional hydropower units, and achieves variable speed constant frequency power generation without excitation or regulation. (3) Efficient and variable speed operation under wide-range water head changes. Adjust the converter output current according to the change of redundant potential head of the circulating water system. Under the condition of balancing the output power of the turbine and the output power of the generator, control the speed of the unit so that the unit always works in the optimal design condition and achieves variable speed and constant frequency power generation. (4) Unattended and highly efficient adaptive operation: By measuring the water pressure difference, speed, output power, etc. of the inlet and outlet turbines in real time, the generator set's working status, start-up, shutdown and protection can be controlled in real time by the control device at the converter end, achieving an unattended "fully automatic, high-efficiency and adaptive" working mode. (5) Applicable to the energy recovery of “ecological water flow” in rivers with hydropower stations. The permanent magnet power generation and circulating water redundant potential energy inclined turbine unit developed is applied to the energy recovery of “ecological water flow” in rivers with hydropower stations. The unit speed is adjusted according to the water level changes before and after the unit. Under the premise of meeting the requirements of releasing “ecological flow”, the energy of the water body is recovered as efficiently as possible, which is also a considerable benefit to the hydropower station, especially rural small hydropower. (6) As a backup power source for large and medium-sized hydropower plants, the permanent magnet generator can be used to generate qualified AC power by manually opening the water supply pipeline of the turbine unit when the hydropower plant is completely cut off from the outside world. This can replace the "battery group" and "diesel generator group" that are commonly used in hydropower plants as backup power sources. It is safe, reliable, maintenance-free, and widely adaptable, and has high efficiency, safety and explosion-proof characteristics.

[0047] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A permanent magnet turbine for recovering redundant potential energy from circulating water, comprising four parts: a guide section, a power section, a tailrace section, and a support section. The guide section includes a volute (1), guide vanes (2), an outer guide ring (3), and an inner guide ring (7). The power section includes a runner (6) and a main shaft (9). The support section includes a volute (1), a bearing base (8), a bearing support (10), and a bearing cover (11). The tailrace section includes a tailrace pipe (5) and a tailrace cone (4). The turbine is characterized in that... The volute (1) receives water in the circumferential direction through the circular inlet channel (20) and discharges water at an angle through the inclined annular outlet (12). One side of the outlet (12) is fixedly connected to the outer guide ring (3) through the outer connecting ring (13), the front flange (27) and bolts. The other side of the outlet is fixedly connected to the bearing base (8) through the inner connecting ring (14), the middle connecting end (51) and bolts. A rear flange (30) is provided on one side of the outer guide ring (3), and the rear flange (30) is connected to the flange of the tailwater pipe (5) through bolts. The inner guide ring (7) is bolted to the guide ring connection end (52) of the bearing base (8). The guide vane (2) is embedded in the cavity formed by the outer guide ring (3) and the outer ring body (50) of the bearing base (8) and is fixed by the inner guide ring (7). The turbine body (6) is keyed to the turbine connection end (60) of the main shaft (9). The generator connection end (55) of the main shaft (9) is keyed to the main motor of the permanent magnet generator. The shaft coupling is fixedly connected. The main shaft (9) is installed in the front bearing chamber (49) and the rear bearing chamber (54) of the bearing base (8) by a pair of bearings respectively, and the bearing support (10) is fixed in the front bearing connection screw hole (48) of the bearing base (8) by bolts. The bearing support (10) is connected to a connecting plate by bolts, and the spokes extending from the connecting plate are welded to the outer wall of the volute (1). The bearing cover (11) is connected in the rear bearing connection screw hole (53) by bolts.

2. The inclined-entry turbine for recovering redundant potential energy of circulating water using permanent magnet power generation according to claim 1, characterized in that, The inlet flow channel (20) of the volute (1) is circular and the outer end is welded with a flange (21). The volute (1) is connected to the water inlet pipe through the flange (21), and the water in the water inlet pipe is introduced into the volute (1) and rotates around the main shaft (9) in the volute (1) to form part of the fluid circulation required to do work. The flow channel cross section (15) provided on one side of the volute (1) is a full circular cross section with a gradually changing diameter. The outlet (12) is an oblique annular shape with a 60-degree angle to the direction of the main shaft (9). The fluid outflow direction of the outlet (12) is an oblique rotating outflow with a 30-degree angle to the main shaft (9). The outer connecting ring (13) is provided with an outer sealing ring (16) and an outer screw hole (19). The outer connecting ring (13) is fixedly connected to the front flange (27) in the outer guide ring (3) by the bolt in the outer screw hole (19) and sealed by the O-ring in the outer sealing ring (16). The inner connecting ring (14) inside the outlet (12) is provided with an inner sealing ring (17) and an inner screw hole (18). The inner connecting ring (14) is connected to the middle connecting end (51) of the bearing base (8) by the bolt in the inner screw hole (18) and sealed by the O-ring in the inner sealing ring (17). The oblique annular outlet (12) overlaps with the oblique annular guide vane inlet (22) of the guide vane body (2) and has the same width; the connecting surfaces of the outer connecting ring (13) and the inner connecting ring (14) are oblique annular surfaces parallel to the outlet (12).

3. The permanent magnet power generation and circulating water redundant potential energy recovery inclined-in turbine according to claim 2, characterized in that, The guide vane body (2) is a flow channel with a near-circular structure composed of an outer ring (24), an inner ring (23), and a guide vane grid (25). The outer ring (24) and the inner ring (23) are near-circular structures with different diameters. The outer side of the guide vane grid (25) is welded to the outer ring (24), and the inner side of the guide vane grid (25) is welded to the inner ring (23). The inlet side of the guide vane grid (25) is the guide vane body inlet end (22) and is coplanar with the oblique annular outlet (12) of the volute (1). Pressurized fluid enters the guide vane grid (25) tangentially through the outlet (12). The outlet side of the guide vane grid (25) is the guide vane body outlet end (26). The fluid can continue to accelerate in the guide vane grid (25) and then flow out at the guide vane body outlet end (26) to enter the "free space" between the guide vane body (2) and the impeller body (6). The outer ring (24) of the guide vane is embedded in the guide vane cavity formed by the outer guide ring (3) and the guide vane cavity wall (28). The inner ring (23) of the guide vane is embedded in the outer ring body (50) provided in the bearing base (8) and is pressed and fixed at the inner guide ring (7) of the bearing base (8) and the guide ring connection end (52) by bolts. The guide vane grid (25) of the guide vane body (2) is composed of seventeen guide vanes arranged in a circular array along the main axis (9). Each guide vane has the same three-dimensional twisted airfoil structure, wherein: The outer wing has a relative thickness of 8.54%, a relative camber of 5.47%, an inlet installation angle of 52.92 degrees, an outlet installation angle of 34.86 degrees, and an ellipse with a minor axis ratio of 3:1 and a minor axis length of 10 mm at the leading edge and a circular shape with a diameter of 3 mm at the trailing edge. The relative thickness of the inner side of the wing is 10.79%, the relative curvature of the inner side of the wing is 2.79%, the inlet installation angle of the inner side of the wing is 44.34 degrees, the outlet installation angle is 36.77 degrees, the leading edge of the inner side of the wing is an ellipse with a major-to-minor axis ratio of 3:1 and a minor axis length of 8mm, and the trailing edge of the outer side of the wing is a circle with a diameter of 3mm.

4. The permanent magnet power generation and circulating water redundant potential energy recovery inclined-in turbine according to claim 3, characterized in that, The outer guide ring (3) is a wide-mouthed, ring-like structure consisting of a front flange (27), a rear flange (30), a guide vane cavity wall (28), a runner chamber wall (29), and a sealing groove (31). The front flange (27) is bolted to the outer bolt hole (19) on one side of the outer connecting ring (13) and sealed by the outer sealing ring (16). The rear flange (30) is bolted to the flange of the tailrace pipe (5) and sealed by the sealing groove (31). The outer ring (24) of the guide vane is placed in the cavity enclosed by the guide vane cavity wall (28). The cavity enclosed by the runner chamber wall (29) is the working chamber of the turbine runner body (6).

5. The permanent magnet power generation and circulating water redundant potential energy recovery inclined-in turbine according to claim 4, characterized in that, The runner body (6) is composed of a runner bushing (32), a runner hub (33), a blade grid (34), and a tailrace cone (35), wherein: The runner bushing (32) is a cylindrical ring with a bushing hexagonal column (37), consisting of a fixing screw hole (38), a mechanical seal retaining ring (39), and a main shaft hole (36). The bushing hexagonal column (37) is tightly fitted with the hub hexagonal column (40) of the runner hub (33). The main shaft hole (36) is installed on the turbine end of the turbine main shaft (9) by a standard key. The runner hub (33) consists of a hub hexagonal column (40), a blade shank hole (41), and a screw hole (42). The hub hexagonal column (40) and the bushing hexagonal column (37) are tightly fitted. The blade shank hole (41) is the placement position of the blade shank (43) of the blade rack (34) and is fixed by a nut at the top of the blade shank. The runner bushing (32), the tailrace cone (35), and the runner hub (33) are fixed together by the screw hole (42). The blade grid (34) consists of six identical blade bodies, each blade body consisting of a blade shank (43) and a blade surface (44). The blade shank (43) is installed in the blade shank hole (41) of the runner hub (33) and fixed by a nut at the top of the blade shank (43). The tailwater cone (35) consists of a conical tailwater guide (45), a tailwater plate (46), and a fixing hole (47). The tailwater guide (45) is welded to the tailwater plate (46) and fixed to the runner hub (33) by bolts through the fixing hole (47). The blade grid (34) consists of six identical blade bodies arranged in a circular array around the main axis (9). Each blade body (44) has the same three-dimensional twisted airfoil structure, wherein: The outer wing has a relative thickness of 5.72%, a relative camber of 0.64%, an inlet installation angle of 18.11 degrees, an outlet installation angle of 14.65 degrees, and an ellipse with a minor axis ratio of 3:1 and a minor axis length of 15 mm at the leading edge and a circular shape with a diameter of 3 mm at the trailing edge. The relative thickness of the inner side of the wing is 14.31%, the relative curvature of the inner side of the wing is 9.09%, the inlet installation angle of the inner side of the wing is 66.36 degrees, the outlet installation angle is 32.27 degrees, the leading edge of the inner side of the wing is an ellipse with a major-to-minor axis ratio of 3:1 and a minor axis length of 16mm, and the trailing edge of the inner side of the wing is a circle with a diameter of 3mm.

6. The permanent magnet power generation and circulating water redundant potential energy recovery inclined-in turbine according to claim 5, characterized in that, The bearing base (8) is an irregular cylindrical structure, consisting of a front bearing connecting screw hole (48), a front bearing chamber (49), an outer ring (50), a middle connecting end (51), a guide ring connecting end (52), a rear bearing connecting screw hole (53), and a rear bearing chamber (54). The front bearing connecting screw hole (48) is bolted to the bearing support (10) welded to the outer wall of the volute, and the middle connecting end (51) is bolted to the inner connecting ring of the volute (1). At (14), a guide vane body (2) is placed in the cavity formed by the outer ring body (50) and the outer guide ring (3). The guide ring connection end (52) is connected to the inner guide ring (7) by bolts, and the guide vane body (2) is fixed by the inner guide ring (7). The bearing cover (11) is assembled with the rear bearing connection screw hole (53) by bolts. A pair of thrust bearings are installed in the front bearing chamber (49) and the rear bearing chamber (54). The thrust bearings are used for positioning the turbine main shaft (9).

7. A permanent magnet power generation and circulating water redundant potential energy recovery inclined-in turbine according to claim 6, characterized in that, The turbine main shaft (9) consists of a generator connection end (55), a front mechanical seal end (56), a front bearing end (57), a rear bearing end (58), a rear mechanical seal end (59), a turbine connection end (60), and turbine fixing bolts (61). The generator connection end (55) is connected to the generator main shaft coupling via a standard key. The front mechanical seal end (56) and the mechanical seal end (62) of the bearing support (10) form a mechanical seal cavity, which is used to install the mechanical seal. (57) The front thrust bearing of the turbine is installed in the cavity formed by the front bearing chamber (49). The rear thrust bearing of the turbine is installed in the cavity formed by the rear bearing end (58) and the rear bearing chamber (54). The rear mechanical seal of the turbine is placed in the open space formed by the rear mechanical seal end (59) and the mechanical seal retaining ring (39). The turbine connection end (60) is installed together with the main shaft hole (36) of the runner bushing (32) by interference fit through a standard key and is fastened by the nut of the turbine fixing bolt (61).

8. A permanent magnet power generation and circulating water redundant potential energy recovery inclined-in turbine according to claim 7, characterized in that, The bearing support (10) is a disc-like structure consisting of a front mechanical seal cavity (62), a bearing fixing hole (63), and a connecting screw hole (64). The front mechanical seal cavity (62) and the front mechanical seal end (56) provided on one side of the main shaft (9) are used to install the front mechanical seal of the turbine. The bearing fixing hole (63) is installed in the front bearing connecting screw hole (48) provided on one side of the bearing base (8) by bolts. The connecting screw hole (64) is connected to the connecting plate by bolts, and the spokes extending from the connecting plate are welded to the outer wall of the volute (1).

9. A permanent magnet power generation and circulating water redundant potential energy recovery inclined-in turbine according to claim 8, characterized in that, The bearing cover (11) is a disc-like structure, consisting of a bearing cover connecting hole (65) and a rear mechanical seal cavity (66). The bearing cover (11) and the bearing base (8) are fixed together by bolts through the bearing cover connecting hole (65) and the rear bearing connecting screw hole (53) provided on one side of the bearing base (8). The rear mechanical seal cavity (66) and the mechanical seal retaining ring (39) provided on one side of the wheel bushing (32) form an open cavity for installing the rear mechanical seal.

10. A permanent magnet power generation and circulating water redundant potential energy recovery inclined-in turbine according to claim 9, characterized in that, The inner guide ring (7) is a device consisting of a fixing hole (67), a mating surface (68), and a guide ring surface (69). It is fixed to the guide ring connecting end (52) on one side of the bearing base (8) by bolts, and the mating surface (68) presses against the inner ring (23) of the guide vane body (2) on one side. The guide ring surface (69) on one side of the inner guide ring (7) is connected to the outer ring (24) of the guide vane body (2) and the inner ring (23) of the guide vane body (2) on one side. The outer side of the runner chamber wall (29) provided on one side of the ring (23), the runner hub (33) provided on one side of the runner body (6) together form a funnel-shaped annular flow channel. The inlet of the flow channel starts at the annular outlet (12) of the volute (1). The flow channel inlet center streamline forms a 30-degree angle with the turbine main shaft (9). The flow channel outlet is at the outlet of the blade grid (34) of the runner body (6). The flow channel outlet center streamline forms a zero-degree angle with the turbine main shaft (9).

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