A compound water turbine

Abstract

The application relates to the technical field of energy-saving equipment, in particular to a composite power water turbine which is installed in a cooling tower air duct and comprises, from bottom to top, a water turbine body, a permanent magnet synchronous motor and a fan blade hub assembly; the water turbine body comprises a water inlet, a runner cavity, a runner body and a water outlet, the water inlet and the water outlet are both communicated with the runner cavity, and the runner body is arranged in the runner cavity; the permanent magnet synchronous motor comprises a main shaft, the bottom end of the main shaft is fixedly connected with a central shaft hole of the runner body, the top end of the main shaft is fixedly connected with a central shaft hole of the fan blade hub assembly, and the main shaft, the central shaft of the runner body and the central shaft of the fan blade hub assembly are coaxially arranged. The application has the effects that the system backwater residual pressure energy can be utilized, and when the system backwater residual pressure energy is lower than the required energy of the fan, the cooling tower temperature drop effect is not affected.

Description

Technical Field

[0001] This application relates to the technical field of energy-saving equipment, and in particular to a composite power turbine. Background Technology

[0002] In every water cooling circulation system, there is residual pressure energy that can be recovered and utilized due to system design. Effectively utilizing this residual pressure energy is a crucial energy-saving measure. In a circulating water cooling tower, a water turbine converts the residual pressure energy of the return water into mechanical energy to drive a fan. This transforms the fan's operation from being driven by a motor (pure electricity) to being driven by the residual energy of the return water (hydraulic power), resulting in high efficiency, energy saving, and considerable economic benefits.

[0003] When water turbines are used in cooling towers to replace electric fans, a prerequisite is that the residual pressure energy of the cooling tower's incoming (return) water must be no less than the energy required for the cooling tower's fans to operate normally. Currently, a large number of cooling towers nationwide have system return water residual pressure energy lower than the energy required by the fans. Because this energy deficiency causes the water turbine fans to not reach the original electric fan speeds after energy-saving retrofits, the cooling tower's temperature reduction effect is affected. If energy-saving retrofits are not performed on the cooling tower fans and only pure electric drive is used, the system's return water residual pressure energy is directly wasted, which is a great pity. Utility Model Content

[0004] In order to utilize the residual pressure energy of the system return water, and to ensure that the cooling tower temperature reduction effect is not affected when the residual pressure energy of the system return water is lower than the energy required by the fan, this application provides a composite power turbine.

[0005] The technical solution for a hybrid power turbine provided in this application is as follows:

[0006] A composite power turbine is installed inside a cooling tower duct, comprising a turbine body, a permanent magnet synchronous motor, and a fan blade hub assembly arranged sequentially from bottom to top;

[0007] The turbine body includes an inlet, a runner cavity, a runner body, and an outlet. The inlet and outlet are both connected to the runner cavity, and the runner body is disposed inside the runner cavity.

[0008] The permanent magnet synchronous motor includes a main shaft, the bottom end of which is fixedly connected to the central shaft hole of the impeller body, and the top end of which is fixedly connected to the central shaft hole of the impeller hub assembly. The main shaft, the central shaft of the impeller body, and the central shaft of the impeller hub assembly are coaxially arranged.

[0009] By adopting the above technical solution, the composite power turbine of this application has a turbine body at the bottom, a permanent magnet synchronous motor in the middle, and a cooling tower fan hub assembly installed on the top shaft extension (all three are coaxial and rotate synchronously). It is integrally installed inside the cooling tower's top fan casing, replacing the traditional cooling tower motor (pure electric) + drive shaft + reducer → drive fan operation. The water inlet is connected to the cooling tower's upper water pipe, and the water outlet is connected to the opening of the cooling tower's internal water distribution main pipe. Water enters the impeller chamber through the water inlet, driving the impeller to rotate, and then is discharged from the water outlet. Depending on the actual situation, this equipment can be equipped with a dedicated four-quadrant frequency converter and industrial PLC intelligent control. In spring and autumn, the fan is driven by the water turbine (converted from the surplus energy of the system's return water, pure water power) (fan speed n2). As long as the cooling tower's cooling requirements are met, the fan operation does not consume electricity. In the hot summer, when the cooling tower outlet temperature is higher than the set value, the four-quadrant frequency converter controls the permanent magnet synchronous motor to run, automatically combining the output of the water turbine. The two forces (water power + electricity) jointly drive the fan to run at high speed (fan speed n1) to cool the cooling tower. In the cold winter, the fan speed is automatically reduced (fan speed n3, and 0 < n3 < n2 < n1), and the equipment can generate electricity and connect to the grid.

[0010] The residual pressure of the return water is fully converted into energy to power the fan, while a small-power motor is used for compensation. The combined effect of these two methods drives the fan to its rated speed. For cooling towers where the residual pressure of the return water is lower than the energy required by the fan, the fan energy-saving retrofit is a significant solution. For example, if a cooling tower system has 100KW of residual pressure energy in the return water, while the cooling tower fan requires 120KW, then the motor compensation power is only 20KW. After the energy-saving retrofit, this fan can save 100KW of electricity, achieving an energy saving rate of over 83%.

[0011] Optionally, the central shaft hole of the impeller body is connected to the main shaft through a rigid coupling, a transfer base is provided at the top of the impeller cavity, a connecting cylinder is fixedly provided in the middle of the transfer base, and the top of the rigid coupling passes through the connecting cylinder;

[0012] A water-throwing ring and a water-sealing component are arranged sequentially from bottom to top between the outer wall of the connecting cylinder and the rigid coupling.

[0013] By adopting the above technical solutions, the rigid coupling facilitates the connection between the impeller and the main shaft, while the water-throwing ring and sealing components effectively block the upward flow of water in the impeller cavity, reducing the possibility of water entering the permanent magnet synchronous motor. Alternatively, a water collection tank and drain hole can be installed on the adapter base according to actual conditions. Even if a small amount of water rises, it can be accumulated in the water collection tank of the adapter base and automatically discharged through the drain hole in a timely manner, further reducing the possibility of water entering the permanent magnet synchronous motor.

[0014] Optionally, a partition ring is fixedly connected inside the connecting cylinder, which divides the interior of the connecting cylinder into an upper chamber and a lower chamber, with the water sealing element and the water-throwing ring located in the upper chamber and the lower chamber, respectively.

[0015] Optionally, the lower diameter of the rigid coupling is larger than the upper diameter, forming a limiting boss, and the bottom of the water-slinging ring abuts against the limiting boss.

[0016] Optionally, a retaining ring is detachably connected to the top of the connecting cylinder, the retaining ring confining the water sealing component within the upper chamber.

[0017] By adopting the above technical solution, the installation of the water sealing component and the water-spinning ring can be achieved, resulting in a compact structure and convenient installation.

[0018] Optionally, the permanent magnet synchronous motor further includes a housing and a stator and a rotor disposed within the housing, the rotor being fixedly connected to the main shaft; the housing is provided with an end cover assembly, the end cover assembly including an upper end cover and a lower end cover, the main shaft passing through the upper end cover and the lower end cover;

[0019] The main shaft has mounting cavities at the positions where it passes through the upper and lower end covers, and the main shaft passes through the mounting cavities. Each mounting cavity is equipped with a bearing and an oil seal. The main shaft is rotatably connected to the upper and lower end covers through the bearings, and the oil seal is used to improve the sealing of the mounting cavities.

[0020] By adopting the above technical solution, laminations are stacked on the main shaft of the permanent magnet synchronous motor, and regular block-shaped neodymium iron boron permanent magnet material is attached to form a permanent magnet, i.e., the rotor. The bearing arrangement facilitates the connection between the main shaft and the end cover assembly and enables the main shaft to rotate stably; the oil seal improves the sealing performance of the mounting cavity.

[0021] Optionally, the upper end cover and the lower end cover are detachably connected to an annular first limiting plate on the side away from the rotor, the main shaft passes through the first limiting plate, the mounting cavity is formed by the first limiting plate and the end cover assembly, the inner wall of the bearing is fixedly connected to the rotating shaft, and the outer wall of the bearing is fixedly connected to the end cover assembly.

[0022] The first limiting plate is detachably connected to a ring-shaped second limiting plate on the side away from the bearing, and the main shaft passes through the second limiting plate; the first limiting plate and the second limiting plate are hollowed out on the side near the main shaft, and form a limiting cavity with the outer wall of the main shaft, and the oil seal is disposed in the limiting cavity.

[0023] By adopting the above technical solution, the installation of bearings and oil seals can be achieved, resulting in a compact structure and convenient installation.

[0024] Optionally, the adapter base includes an adapter cover and an adapter cylinder fixedly connected to the top surface of the adapter cover. The adapter cover is detachably connected to the opening at the top of the rotary chamber, and the top of the adapter cylinder is detachably connected to the lower end cover.

[0025] By adopting the above technical solution, on the one hand, the lower end cover has a stable connection foundation, thereby improving the stability of the permanent magnet synchronous motor during installation and operation; on the other hand, the connecting cylinder can cover the mounting structure around the rigid coupling, providing protection for the internal structure and improving the external aesthetics. Furthermore, the detachable connections between the various parts facilitate the gradual assembly and disassembly of each component.

[0026] Optionally, the bottom of the impeller cavity is fixedly installed as a single unit with the foundation at the top of the central column inside the air duct.

[0027] By adopting the above technical solution, the entire set of equipment is installed as a whole on the foundation of the central column inside the wind tunnel through the bottom of the turbine runner cavity (i.e., the base plate), and the equipment can operate stably and safely for a long time.

[0028] In summary, this application includes at least the following beneficial technical effects:

[0029] This utility model patent uses a composite power turbine to replace the traditional cooling tower fan drive source (high-power motor + transmission shaft + reducer), which not only simplifies the complicated power transmission mechanism, reduces failure points, lowers the failure rate, and greatly improves efficiency; but also greatly reduces energy (electricity) consumption, and can generate electricity and connect to the grid, continuously bringing considerable economic benefits to enterprises throughout the year.

[0030] This composite power turbine primarily utilizes the residual pressure energy of the return water for power generation, supplemented by the combined force of a permanent magnet synchronous motor. The permanent magnet synchronous motor can be started and stopped as needed without interfering with the turbine's operation. This utility model patent features a compact and simple structure, reliable operation, and long service life. The turbine runner is made of 304 stainless steel, and the lower shaft of the permanent magnet synchronous motor is integrally connected to the turbine runner via a rigid coupling (protection level of IP67 or higher). It boasts reliable quality, higher efficiency, fewer potential failure points, and can operate continuously for over 80,000 hours. The permanent magnet synchronous motor has an IP67 or higher protection level, enabling long-term stable operation in humid and hot environments. This equipment has a wide range of applications, suitable for mechanical exhaust cooling towers in the petroleum, chemical, power, metallurgical, machinery, textile, and pharmaceutical industries. Its simple structure and convenient maintenance reduce repair costs and daily maintenance workload. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of a composite power turbine according to an embodiment of this application.

[0032] Figure 2 This is a top view of the composite power turbine of the embodiment of this application.

[0033] Figure 3 This is a structural schematic diagram used in this application embodiment to illustrate the connection relationship between the permanent magnet synchronous motor and the turbine body.

[0034] Figure 4 yes Figure 3 Enlarged view of point A in the middle

[0035] Explanation of reference numerals in the attached drawings: 1. Inlet; 2. Runner body; 3. Outlet; 4. Runner cavity; 5. Adapter base; 6. Rigid coupling; 7. Water-throwing ring; 8. Water sealing component; 9. Main shaft; 10. Lower end cover; 11. Rotor; 12. Upper end cover; 13. Bearing; 14. Oil seal; 15. Fan hub assembly; 16. Permanent magnet synchronous motor; 17. Connecting cylinder; 18. Separating ring; 19. Limiting boss; 20. Retaining ring; 21. Stator; 22. Mounting cavity; 23. First limiting plate; 24. Second limiting plate; 25. Limiting cavity; 26. Adapter cover; 27. Adapter cylinder; 28. Turbine body. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0037] This application discloses a composite power water turbine. (Refer to...) Figure 1-3 The combined power turbine is installed inside the cooling tower duct and includes, from bottom to top, a turbine body 28, a permanent magnet synchronous motor 16, and a fan blade hub assembly 15. The turbine body 28 includes an inlet 1, a runner cavity 4, a runner body 2, and an outlet 3. The inlet 1 and the outlet 3 are both connected to the runner cavity 4, and the runner body 2 is disposed inside the runner cavity 4.

[0038] The water inlet 1 is offset from the center of the turbine runner 2 and enters at a 90° angle with the tangent of the turbine runner cavity 4. The bottom of the turbine runner cavity 4 is fixedly installed as a whole with the foundation of the central column inside the wind tunnel. The entire set of equipment is installed as a whole with the bottom of the turbine runner cavity 4 (i.e., the base plate) and the foundation of the central column inside the wind tunnel, ensuring long-term stable and safe operation. The permanent magnet synchronous motor 16 includes a main shaft 9. The bottom end of the main shaft 9 is fixedly connected to the central shaft hole of the turbine runner 2, and the top end of the main shaft 9 is fixedly connected to the central shaft hole of the impeller hub assembly 15. The main shaft 9, the central shaft of the turbine runner 2, and the central shaft of the impeller hub assembly 15 are coaxially arranged.

[0039] The composite power turbine of this application consists of a turbine body 28 at the bottom, a permanent magnet synchronous motor 16 in the middle, and a cooling tower fan hub assembly 15 mounted on the top shaft (all three are coaxial and rotate synchronously). It is integrally installed inside the cooling tower's top fan casing, replacing the traditional cooling tower motor (pure electric) + drive shaft + reducer → drive fan operation. The inlet 1 is connected to the cooling tower's upper water pipe, and the outlet 3 is connected to the opening of the cooling tower's internal water distribution main pipe. Water enters the impeller chamber 4 through the inlet 1, driving the impeller to rotate, and then exits from the outlet 3. Depending on the actual situation, this equipment can be equipped with a dedicated four-quadrant frequency converter and industrial PLC intelligent control. In spring and autumn, the fan is driven by the water turbine (converted from the surplus energy of the system's return water, pure water power) (fan speed n2). As long as the cooling tower's cooling requirements are met, the fan operation does not consume electricity. In the hot summer, when the cooling tower outlet temperature is higher than the set value, the four-quadrant frequency converter controls the permanent magnet synchronous motor 16 to run, automatically combining the output of the water turbine. The two forces (water power + electricity) jointly drive the fan to run at high speed (fan speed n1) to cool the cooling tower. In the cold winter, the fan speed is automatically reduced (fan speed n3, and 0 < n3 < n2 < n1), and the equipment can generate electricity and connect to the grid.

[0040] The residual pressure of the return water is fully converted into energy to power the fan, while a small-power motor is used for compensation. The combined effect of these two methods drives the fan to its rated speed. For cooling towers where the residual pressure of the return water is lower than the energy required by the fan, the fan energy-saving retrofit is a significant solution. For example, if a cooling tower system has 100KW of residual pressure energy in the return water, while the cooling tower fan requires 120KW, then the motor compensation power is only 20KW. After the energy-saving retrofit, this fan can save 100KW of electricity, achieving an energy saving rate of over 83%.

[0041] Reference Figure 3-4 The central shaft hole of the impeller body 2 is connected to the main shaft 9 through a rigid coupling 6. A transfer base 5 is provided on the top of the impeller cavity 4, and a connecting cylinder 17 is fixedly provided in the middle of the transfer base 5. The top of the rigid coupling 6 passes through the connecting cylinder 17. A water-throwing ring 7 and a water-sealing component 8 are arranged sequentially from bottom to top between the outer wall of the connecting cylinder 17 and the rigid coupling 6.

[0042] The rigid coupling 6 facilitates the connection between the impeller body 2 and the main shaft 9, while the water-throwing ring 7 and the water-sealing component 8 effectively block the upward flow of water in the impeller cavity 4, reducing the possibility of water entering the permanent magnet synchronous motor 16. Alternatively, a water collection tank and a drain hole can be installed on the adapter base 5 according to actual conditions. Even if a small amount of water rises, it can be accumulated in the water collection tank of the adapter base 5 and automatically discharged through the drain hole in a timely manner, further reducing the possibility of water entering the permanent magnet synchronous motor 16.

[0043] Reference Figure 3-4The connecting cylinder 17 has an integrally formed partition ring 18, which divides the interior of the connecting cylinder 17 into an upper chamber and a lower chamber. The water sealing component 8 and the water-throwing ring 7 are located in the upper chamber and the lower chamber, respectively. The diameter of the lower part of the rigid coupling 6 is larger than that of the upper part, forming a limiting boss 19. The inner side of the bottom of the water-throwing ring 7 abuts against the limiting boss 19. The top of the connecting cylinder 17 is detachably connected to a retaining ring 20 by bolts. The retaining ring 20 confines the water sealing component 8 in the upper chamber, realizing the installation of the water sealing component 8 and the water-throwing ring 7. The structure is compact and the installation is convenient.

[0044] Reference Figure 3-4 The permanent magnet synchronous motor 16 also includes a housing and a stator 21 and a rotor 11 disposed within the housing. The rotor 11 is fixedly connected to the main shaft 9. An end cover assembly is provided on the housing, including an upper end cover 12 and a lower end cover 10. The main shaft 9 passes through the upper end cover 12 and the lower end cover 10. Mounting cavities 22 are provided at the locations where the main shaft 9 passes through the upper end cover 12 and the lower end cover 10. Bearings 13 are disposed within each mounting cavity 22, and oil seals 14 are also provided at each mounting cavity 22. The main shaft 9 is rotatably connected to the upper end cover 12 and the lower end cover 10 via the bearings 13. The oil seals 14 are used to improve the sealing performance of the mounting cavities 22. Laminations are stacked on the main shaft 9 of the permanent magnet synchronous motor 16, and regularly shaped neodymium iron boron permanent magnet material is attached to form the permanent magnet, i.e., the rotor 11. The bearing 13 facilitates the connection between the spindle 9 and the end cover assembly and enables the spindle 9 to rotate stably; the oil seal 14 improves the sealing performance of the mounting cavity 22.

[0045] Reference Figure 3-4 The upper end cover 12 and the lower end cover 10 are detachably connected by bolts to an annular first limiting plate 23 on the side away from the rotor 11. The main shaft 9 passes through the first limiting plate 23. The mounting cavity 22 is formed by the first limiting plate 23 and the end cover assembly. The inner wall of the bearing 13 is fixedly connected to the rotating shaft, and the outer wall of the bearing 13 is fixedly connected to the end cover assembly. The side of the first limiting plate 23 away from the bearing 13 is detachably connected by bolts to an annular second limiting plate 24. The main shaft 9 passes through the second limiting plate 24. The sides of the first limiting plate 23 and the second limiting plate 24 near the main shaft 9 are hollowed out and form a limiting cavity 25 with the outer wall of the main shaft 9. The middle part of the second limiting plate 24 protrudes upward. The oil seal 14 is set in the limiting cavity 25 and is limited by the protrusion in the middle of the second limiting plate 24. This achieves the installation of the bearing 13 and the oil seal 14, with a compact structure and convenient installation. The oil seal 14 and the water sealing component 8 are both existing technologies and can be selected and installed according to the actual situation.

[0046] Reference Figure 3-4The adapter base 5 includes an adapter cover 26 and an adapter cylinder 27 fixedly connected to the top surface of the adapter cover 26. The adapter cover 26 is detachably connected to the opening at the top of the rotor cavity 4 by bolts. The top of the adapter cylinder 27 is detachably connected to the lower end cover 10 by bolts. This design provides a stable connection base for the lower end cover 10, thereby improving the stability of the permanent magnet synchronous motor 16 during installation and operation. Furthermore, the adapter cylinder 17 can cover the mounting structure around the rigid coupling 6, providing protection for the internal structure and improving the external aesthetics. The detachable connections between the various parts facilitate gradual assembly and disassembly of the components.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A composite power turbine, characterized in that: Installed inside the cooling tower duct, it includes a water turbine body (28), a permanent magnet synchronous motor (16), and a fan blade hub assembly (15) arranged from bottom to top; The turbine body (28) includes an inlet (1), a runner cavity (4), a runner body (2), and an outlet (3). The inlet (1) and the outlet (3) are both connected to the runner cavity (4), and the runner body (2) is disposed inside the runner cavity (4). The permanent magnet synchronous motor (16) includes a main shaft (9), the bottom end of which is fixedly connected to the central shaft hole of the rotor body (2), and the top end of which is fixedly connected to the central shaft hole of the impeller hub assembly (15). The central shaft of the main shaft (9), the rotor body (2), and the central shaft of the impeller hub assembly (15) are coaxially arranged.

2. The composite power turbine according to claim 1, characterized in that: The central shaft hole of the wheel body (2) is connected to the main shaft (9) through a rigid coupling (6). A transfer base (5) is provided at the top of the wheel cavity (4). A connecting cylinder (17) is fixedly provided in the middle of the transfer base (5). The top of the rigid coupling (6) passes through the connecting cylinder (17). A water-throwing ring (7) and a water-sealing component (8) are arranged sequentially from bottom to top between the outer walls of the connecting cylinder (17) and the rigid coupling (6).

3. A composite power turbine according to claim 2, characterized in that: A partition ring (18) is fixedly connected inside the connecting cylinder (17). The partition ring (18) divides the interior of the connecting cylinder (17) into an upper chamber and a lower chamber. The water sealing element (8) and the water-throwing ring (7) are located in the upper chamber and the lower chamber, respectively.

4. A composite power turbine according to claim 3, characterized in that: The lower diameter of the rigid coupling (6) is larger than the upper diameter, forming a limiting boss (19), and the bottom of the water-throwing ring (7) abuts against the limiting boss (19).

5. A composite power turbine according to claim 4, characterized in that: The top of the connecting cylinder (17) is detachably connected to a retaining ring (20), which restricts the water sealing element (8) to be located in the upper chamber.

6. A composite power turbine according to claim 2, characterized in that: The permanent magnet synchronous motor (16) also includes a housing and a stator (21) and a rotor (11) disposed within the housing. The rotor (11) is fixedly connected to the main shaft (9). An end cover assembly is provided on the housing. The end cover assembly includes an upper end cover (12) and a lower end cover (10). The main shaft (9) passes through the upper end cover (12) and the lower end cover (10). The main shaft (9) has mounting cavities (22) at the positions where it passes through the upper end cover (12) and the lower end cover (10). The main shaft (9) passes through the mounting cavities (22). Each mounting cavity (22) is provided with a bearing (13). An oil seal (14) is also provided at the mounting cavity (22). The main shaft (9) is rotatably connected to the upper end cover (12) and the lower end cover (10) through the bearings (13). The oil seal (14) is used to improve the sealing performance of the mounting cavity (22).

7. A composite power turbine according to claim 6, characterized in that: The upper end cover (12) and the lower end cover (10) are detachably connected to an annular first limiting plate (23) on the side away from the rotor (11). The main shaft (9) passes through the first limiting plate (23). The mounting cavity (22) is formed by the first limiting plate (23) and the end cover assembly. The inner wall of the bearing (13) is fixedly connected to the rotating shaft, and the outer wall of the bearing (13) is fixedly connected to the end cover assembly. The first limiting plate (23) is detachably connected to a ring-shaped second limiting plate (24) on the side away from the bearing (13), and the main shaft (9) passes through the second limiting plate (24); the first limiting plate (23) and the second limiting plate (24) are hollowed out on the side near the main shaft (9) and form a limiting cavity (25) between them and the outer wall of the main shaft (9), and the oil seal (14) is disposed in the limiting cavity (25).

8. A composite power turbine according to claim 6, characterized in that: The adapter base (5) includes an adapter cover (26) and an adapter cylinder (27) fixedly connected to the top surface of the adapter cover (26). The adapter cover (26) is detachably connected to the opening at the top of the rotary chamber (4). The top of the adapter cylinder (27) is detachably connected to the lower end cover (10).

9. A composite power turbine according to claim 1, characterized in that: The bottom of the impeller cavity (4) is fixedly installed as one unit with the foundation of the central column inside the wind tunnel.

Images