Water turbine with permanent magnet motor

Abstract

The invention belongs to the technical field of water turbines, and discloses a water turbine with a permanent magnet motor, the water turbine comprises a main shaft, the permanent magnet motor, a water throwing disc and a water seal part, one end of the main shaft is provided with a fan, the other end of the main shaft is provided with a water wheel assembly, and the permanent magnet motor comprises a motor shell, a stator and a rotor; the stator is installed on the inner side wall of the motor shell, the rotor is installed on the main shaft, the water throwing disc is arranged on the main shaft in a sleeving mode and faces the fan, a plurality of grooves are formed in the water throwing disc and are arranged at intervals in the radial direction of the main shaft, protruding parts matched with the grooves are arranged on the motor shell, and the main shaft is sleeved with the water sealing part and faces the water wheel assembly. According to the water turbine, the water wheel assembly, the stator and the rotor are made into an integrated structure, the overall size is small, and the problem that when high-temperature and high-humidity weather occurs in summer, the water turbine cannot meet operation of the whole system can be solved.

Description

Technical Field

[0001] This invention relates to the field of water turbine technology, and more particularly to a water turbine with a permanent magnet motor. Background Technology

[0002] A water turbine is a hydraulic prime mover that converts water energy into rotational mechanical energy. In cooling tower circulating water systems, there is often a surplus of water energy, which the water turbine converts into rotational mechanical energy around its shaft, thereby driving the fan. However, during hot and humid summer weather, when the temperature of the return and inlet water in the cooling tower circulating water system changes, the water turbine may not be able to meet the normal operating requirements of the cooling tower. Summary of the Invention

[0003] The purpose of this invention is to provide a water turbine with a permanent magnet motor. This water turbine integrates the turbine assembly, stator, and rotor into a single structure, resulting in a smaller overall size. This addresses the issue of water turbines being unable to meet the system's operational requirements during hot and humid summer weather. When the cooling tower return water temperature exceeds the required production temperature, the auxiliary permanent magnet motor starts working, providing additional power to the water turbine. In winter, when temperatures are low, the water turbine itself drives the fan, with the permanent magnet motor acting as a generator to convert kinetic energy into electrical energy for storage, effectively helping the factory save energy.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] This invention discloses a water turbine with a permanent magnet motor, comprising: a main shaft, one end of which is equipped with a fan and the other end with a water turbine assembly; a permanent magnet motor, comprising a motor housing, a stator, and a rotor, the motor housing having a shaft hole through which the main shaft passes, the stator being mounted on the inner side wall of the motor housing, and the rotor being mounted on the main shaft; a water-spinning disc, which is sleeved on the main shaft and faces the fan, the water-spinning disc having multiple grooves arranged radially at intervals along the main shaft, and the motor housing having protrusions that mate with the grooves; and a water seal, which is sleeved on the main shaft and faces the water turbine assembly.

[0006] In some embodiments, the surface of the water-spraying disc facing the motor housing is formed as a concave inner surface, and the surface of the motor housing facing the water-spraying disc is formed as a convex outer surface.

[0007] In some embodiments, the motor housing is provided with a Hall sensor corresponding to the water-spinning plate, and the water-spinning plate is provided with a plurality of detection grooves spaced apart along its circumference; and / or: a sealing structure is provided between the water-spinning plate and the main shaft.

[0008] In some embodiments, the motor housing includes a first end cap, a housing body, and a second end cap, wherein the first end cap and the second end cap are connected to both ends of the housing body; wherein the first end cap is disposed toward the fan, and the second end cap is disposed toward the water turbine assembly.

[0009] In some specific embodiments, the housing body is provided with at least one temperature sensor extending into the interior of the motor housing; and / or:

[0010] The housing body is provided with a lubrication channel communicating with the internal space of the motor housing, and the housing body is also provided with a grease nipple that seals the lubrication channel.

[0011] In some specific embodiments, a first oil seal is provided between the first end cover and the main shaft; and / or, a second oil seal is provided between the second end cover and the main shaft.

[0012] In some specific embodiments, a first radial bearing is provided between the end of the housing body facing the fan and the main shaft, and a second radial bearing is provided between the end of the housing body facing the water turbine assembly and the main shaft; a thrust bearing is also provided between the housing body and the main shaft, and the thrust bearing is located between the first radial bearing and the second radial bearing.

[0013] In some more specific embodiments, the housing body has an inwardly extending portion, and the motor housing further includes a third end cap connected to one end of the extension portion, the third end cap abutting against one end of the thrust bearing, and a spacer is provided between the other end of the thrust bearing and the second radial bearing.

[0014] In some specific embodiments, the shell body includes a first end plate, a connecting cylinder, and a second end plate. The first end plate and the second end plate are connected to the two ends of the connecting cylinder. The second end plate includes a first plate and a second plate spaced apart. The first plate is connected to the connecting cylinder, and the second plate is connected to the water turbine housing of the water turbine assembly. The second end cap is installed between the first plate and the second plate.

[0015] In some more specific embodiments, the water seal includes a water seal body and a water seal end cap, the water seal end cap being mounted on the second plate and the water seal body being mounted inside the water seal end cap.

[0016] The beneficial effects of this invention are as follows: By integrating the water turbine assembly and the permanent magnet motor onto the same main shaft, the two components are fused into a single structure. When the permanent magnet motor is not powered, the circulating water in the cooling tower drives the water turbine body of the water turbine assembly to rotate, simultaneously driving the main shaft to rotate. The fan blades mounted on the main shaft then begin to operate, achieving a cooling effect. Simultaneously, the rotation of the main shaft drives the rotor of the permanent magnet motor. The rotor is embedded with magnets, which generate a magnetic field. When the rotor rotates, the magnetic field of the permanent magnet passes through the copper wire windings of the stator, generating an induced electromotive force, thereby converting electrical energy. The permanent magnet motor is also equipped with an energy storage device to store electrical energy. In summer, when temperatures are high and the rotation of the water turbine assembly is insufficient to cool the entire tower, the permanent magnet motor starts to provide auxiliary power to the water turbine assembly, ensuring that the fan operates at its rated speed and guaranteeing that the cooling tower achieves the design requirements for cooling performance. Because the water turbine assembly and the permanent magnet motor are integrated into a single structure, the water turbine has a high degree of integration, a relatively small overall size, and is convenient to use. Because a water-spraying plate is provided at the end of the main shaft near the fan, and multiple grooves are provided on the water-spraying plate, the multiple grooves are arranged at radial intervals along the main shaft, and the motor housing is provided with protrusions that cooperate with the grooves, so that a labyrinth sealed flow channel is formed between the water-spraying plate and the motor housing. A water seal is provided on the side of the main shaft near the water wheel assembly, which effectively prevents external water mist from entering the permanent magnet motor, thereby ensuring the working reliability of the permanent magnet motor.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of a water turbine with a permanent magnet motor according to an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A magnified diagram showing point A (circled).

[0020] Figure 3 This is a partial structural cross-sectional view of a water turbine with a permanent magnet motor according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the water-spinning tray according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the water-spinning tray from another direction according to an embodiment of the present invention.

[0023] Figure label:

[0024] 1. Main shaft; 2. Fan; 3. Water turbine assembly; 31. Water turbine body; 32. Water turbine housing;

[0025] 4. Permanent magnet motor; 41. Motor housing; 4101. Lubrication channel; 411. First end cover; 4111. Protrusion; 4112. Outer convex surface; 412. Housing body; 4121. First end plate; 4122. Connecting cylinder; 4123. Second end plate; 41231. First plate; 41232. Second plate; 41233. Extension; 413. Second end cover; 414. Third end cover; 42. Stator; 43. Rotor; 431. Magnet;

[0026] 5. Water-spinning tray; 51. Groove; 52. Concave surface; 53. Inspection groove;

[0027] 6. Water seal component; 61. Water seal body; 62. Water seal end cap;

[0028] 7. Hall sensor; 8. Sealing structure; 9. Temperature sensor; 10. Grease injection nozzle;

[0029] 11. First oil seal; 12. Second oil seal; 13. First radial bearing;

[0030] 14. Second radial bearing; 15. Thrust bearing; 16. Spacer; 17. Set screw. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0032] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0034] This invention discloses a water turbine with a permanent magnet motor (hereinafter referred to as a water turbine for ease of description), see reference. Figure 1 and Figure 3 As shown, the water turbine includes a main shaft 1, a permanent magnet motor 4, a water-throwing plate 5, and a water seal 6. A fan 2 is installed at one end of the main shaft 1, and a water turbine assembly 3 is installed at the other end. The permanent magnet motor 4 includes a motor housing 41, a stator 42, and a rotor 43. The motor housing 41 has a shaft hole through which the main shaft 1 passes. The stator 42 is installed on the inner side wall of the motor housing 41, and the rotor 43 is installed on the main shaft 1. The water-throwing plate 5 is sleeved on the main shaft 1 and faces the fan 2. The water-throwing plate 5 is provided with multiple grooves 51, which are arranged radially at intervals along the main shaft 1. The motor housing 41 is provided with protrusions 4111 that cooperate with the grooves 51. The water seal 6 is sleeved on the main shaft 1 and faces the water turbine assembly 3.

[0035] Understandably, in the above technical solution, the water turbine assembly 3 and the permanent magnet motor 4 are integrated on the same main shaft 1, forming a single structure. When the permanent magnet motor 4 is not powered, the circulating water in the cooling tower drives the water turbine body 31 of the water turbine assembly 3 to rotate, which in turn drives the main shaft 1 to rotate. The fan 2 mounted on the main shaft 1 then starts working, providing a cooling effect. Simultaneously, the rotation of the main shaft 1 drives the rotor 43 of the permanent magnet motor 4 to rotate. The rotor 43 is embedded with magnets 431, which are neodymium iron boron (other permanent magnet materials can also be selected according to actual needs). These magnets generate a magnetic field. When the rotor 43 rotates, the magnetic field of the permanent magnet passes through the copper wire windings of the stator 42, generating an induced electromotive force, thereby achieving the conversion of electrical energy. The permanent magnet motor 4 is also equipped with an energy storage device to store the electrical energy. When temperatures rise in summer, the rotation of the water turbine assembly 3 may not be sufficient to cool the entire tower. The permanent magnet motor 4 then starts, providing auxiliary power to the water turbine assembly 3 to ensure that the fan 2 operates at its rated speed, thus guaranteeing the cooling tower achieves its design cooling effect. Because the water turbine assembly 3 and the permanent magnet motor 4 are integrated into a single structure, the water turbine has a high degree of integration and a relatively small overall size, making it convenient to use. A water-slinging plate 5 is located at the end of the main shaft 1 near the fan 2, forming a labyrinth seal between the water-slinging plate 5 and the motor housing 41. A water seal 6 is also located on the side of the main shaft 1 near the water turbine assembly 3, effectively preventing external water mist from entering the permanent magnet motor 4, thereby ensuring the reliable operation of the permanent magnet motor 4.

[0036] It should be noted that when the temperature is low, the permanent magnet motor 4 acts as a generator. The electrical connection between the generator and the energy storage device, as well as the connection between the turbine control system and the energy storage device and the permanent magnet motor 4, are existing technologies and do not need to be explained here.

[0037] Optionally, the permanent magnet motor 4 is also equipped with a frequency converter, which adopts variable frequency speed control technology. The frequency converter can track the rotation speed of the water turbine assembly 3 in real time, so that the starting speed of the permanent magnet motor 4 matches the rotation speed of the water turbine assembly 3, and has a speed regulation function to ensure the best cooling effect.

[0038] Optionally, the water-spraying plate 5 is provided with three grooves 51, and the motor housing 41 is provided with a protrusion 4111, which engages with the innermost groove 51. This enhances the blocking effect on water mist. Of course, in other embodiments of the present invention, the number of grooves 51 on the water-spraying plate 5 and the number of protrusions 4111 on the motor housing 41 can be selected according to actual needs and are not limited to the above limitations.

[0039] refer to Figure 3 , Figure 4 and Figure 5 As shown, the surface of the water-spraying plate 5 facing the motor housing 41 is formed as a concave inner surface 52, and the surface of the motor housing 41 facing the water-spraying plate 5 is formed as a convex outer surface 4112. It can be understood that the groove 51 of the water-spraying plate 5 is designed to seal the gap between the motor housing 41 and the water-spraying plate 5 when water mist enters. This seal prevents water from entering the outside of the water-spraying plate 5. Furthermore, the convex outer surface 4112 on the surface of the motor housing 41 facing the water-spraying plate 5 allows water droplets to flow outwards under the guidance of the convex outer surface 4112, further reducing the possibility of water entering the permanent magnet motor 4.

[0040] Optionally, the water-spraying tray 5 is blackened to effectively prevent rust.

[0041] Optional, see reference Figure 3 As shown, a Hall sensor 7 is provided on the motor housing 41, corresponding to the water-spinning plate 5. The water-spinning plate 5 has multiple detection slots 53 spaced circumferentially on it. It can be understood that during actual operation, as the water-spinning plate 5 rotates, the Hall sensor 7 can detect the rotational speed of the water-spinning plate 5 due to the multiple detection slots 53, thus determining the rotational speed of the main shaft 1. During heat dissipation, the feedback control between the Hall sensor 7 and the turbine's control module can precisely control the speed of the fan 2, thereby accurately meeting the heat dissipation requirements.

[0042] Optional, see reference Figure 3 As shown, a sealing structure 8 is provided between the water-spinning plate 5 and the main shaft 1. The added sealing structure 8 can ensure the sealing of the connection between the water-spinning plate 5 and the main shaft 1, and prevent water vapor from entering the permanent magnet motor 4 from the mating gap between the water-spinning plate 5 and the main shaft 1.

[0043] Optional, see reference Figure 2As shown, the water-spinning plate 5 is provided with positioning holes, and the water-spinning plate 5 is fixed to the main shaft 1 by set screws 17 in the positioning holes. This ensures the connection stability between the water-spinning plate 5 and the main shaft 1 and prevents the water-spinning plate 5 from rotating relative to the main shaft 1. Of course, in other embodiments of the present invention, the water-spinning plate 5 can also be connected to the main shaft 1 by means of key connection or other connection methods.

[0044] refer to Figure 3 As shown, the motor housing 41 includes a first end cover 411, a housing body 412, and a second end cover 413. The first end cover 411 and the second end cover 413 are connected to both ends of the housing body 412. The first end cover 411 faces the fan 2, and the second end cover 413 faces the water turbine assembly 3. It is understandable that disassembling the motor housing 41 into the first end cover 411, the housing body 412, and the second end cover 413 facilitates assembly, improves the assembly efficiency of the permanent magnet motor 4, and simplifies the manufacturing process of the motor housing 41, reducing manufacturing costs. Optionally, the first end cover 411 and the second end cover 413 can be connected to the housing body 412 by means of snap-fit ​​connections, screw connections, or other methods.

[0045] refer to Figure 3 As shown, the housing body 412 is equipped with at least one temperature sensor 9 that extends into the motor housing 41. It can be understood that by connecting the signal of the temperature sensor 9 to the turbine control system, the temperature of the permanent magnet motor 4 can be monitored in real time. When the permanent magnet motor 4 overheats, the user can be promptly alerted. The speed of the permanent magnet motor 4 can also be adjusted based on the detection results of the temperature sensor 9, thereby controlling the speed of the fan 2 to cool down the permanent magnet motor 4.

[0046] Optionally, a first oil seal 11 is provided between the first end cover 411 and the main shaft 1. The first oil seal 11 is located inside the water-spinning pan 5, which can further prevent external water vapor from entering the permanent magnet motor 4. The type and sealing level of the first oil seal 11 can be selected according to actual needs, and the parameters of the first oil seal 11 are not limited here.

[0047] Optionally, a second oil seal 12 is provided between the second end cover 413 and the main shaft 1. The second oil seal 12 is located inside the water seal 6, which can further prevent external water vapor from entering the permanent magnet motor 4. The type and sealing level of the second oil seal 12 can be selected according to actual needs, and the parameters of the second oil seal 12 are not limited here.

[0048] refer to Figure 3As shown, a first radial bearing 13 is provided between the end of the housing 412 facing the fan 2 and the main shaft 1, and a second radial bearing 14 is provided between the end of the housing 412 facing the turbine assembly 3 and the main shaft 1; a thrust bearing 15 is also provided between the housing 412 and the main shaft 1, and the thrust bearing 15 is located between the first radial bearing 13 and the second radial bearing 14. It can be understood that the thrust bearing 15 is installed on the main shaft 1 to bear the weight of the turbine body 31 of the turbine assembly 3 and the fan 2, as well as the additional axial force. At the same time, the first radial bearing 13 and the second radial bearing 14 are respectively provided at both ends of the main shaft 1, which can sufficiently support the main shaft 1 and also support the turbine assembly 3, ensuring that the turbine can operate stably.

[0049] Optionally, two temperature sensors 9 are used, one corresponding to the first radial bearing 13 and the other corresponding to the thrust bearing 15. In actual operation, overheating of the bearings can cause severe wear on the spindle 1. By positioning the temperature sensors 9 corresponding to the first radial bearing 13 and the thrust bearing 15, the excessive temperature of the first radial bearing 13, the second radial bearing 14, and the thrust bearing 15 can be effectively prevented, thereby ensuring stable rotation of the spindle 1.

[0050] refer to Figure 3 As shown, the housing body 412 is provided with a lubrication channel 4101 communicating with the internal space of the motor housing 41, and the housing body 412 is also provided with a grease nipple 10 to seal the lubrication channel 4101. It can be understood that the position where the lubrication channel 4101 communicates with the internal space of the motor housing 41 is directly opposite the thrust bearing 15. In actual operation, lubricating oil can be injected into the motor housing 41 through the lubrication channel 4101 to lubricate the components inside the permanent magnet motor 4 that require lubrication. The lubricating oil also plays a role in cooling. The added grease nipple 10 can prevent external contaminants from entering the lubrication channel 4101.

[0051] Optionally, the housing body 412 has an inwardly extending portion 41233, and the motor housing 41 also includes a third end cap 414 connected to one end of the extension portion 41233. A spacer 16 is provided between the other end of the thrust bearing 15 and the second radial bearing 14. It is understood that the spacer 16 prevents the thrust bearing 15 from moving, thereby ensuring that the main shaft 1 can rotate stably, and the third end cap 414 is used to prevent grease leakage.

[0052] refer to Figure 3As shown, the shell body 412 includes a first end plate 4121, a connecting cylinder 4122, and a second end plate 4123. The first end plate 4121 and the second end plate 4123 are connected to the two ends of the connecting cylinder 4122. The second end plate 4123 includes a first plate 41231 and a second plate 41232 spaced apart. The first plate 41231 is connected to the connecting cylinder 4122, and the second plate 41232 is connected to the water turbine housing 32 of the water turbine assembly 3. A second end cap 413 is installed between the first plate 41231 and the second plate 41232. It can be understood that by setting the second end plate 4123 into an I-shaped structure with the first plate 41231 and the second plate 41232, the first plate 41231 serves as the end plate for sealing the connecting cylinder 4122, and the second plate 41232 serves as the connecting structure for the water turbine housing 32. This eliminates the need for an additional connecting shell, which helps to reduce structural complexity and thus reduce manufacturing costs.

[0053] Optionally, the water seal component 6 includes a water seal body 61 and a water seal end cap 62. The water seal end cap 62 is mounted on the second plate 41232, and the water seal body 61 is mounted inside the water seal end cap 62. It is understood that in the actual assembly process, the water seal body 61 is mounted onto the water seal end cap 62, and then the water seal body 61 is fitted onto the main shaft 1. The water seal end cap 62 is then connected to the second plate 41232. This connection method has good stability and high sealing performance, and the water seal body 61 can stably prevent external water vapor from entering the permanent magnet motor 4.

[0054] Alternatively, the water seal end cap 62 and the second plate 41232 can be connected by connecting bolts. Of course, in other embodiments of the present invention, the water seal end cap 62 can also be connected to the second plate 41232 by means of snap-fit ​​connection or other methods.

[0055] The advantages of the water turbine of the present invention are as follows:

[0056] First, the permanent magnet motor 4 and the water turbine assembly 3 are integrated into a single structure, which is simple in structure, ensures coaxiality, effectively reduces overall vibration, and lowers the overall height of the equipment, saving costs and facilitating installation.

[0057] Secondly, a water-spraying plate 5 is provided at one end of the permanent magnet motor 4, and a water seal 6 is provided at the other end, which effectively prevents external water mist from entering the permanent magnet motor 4.

[0058] Third, in the whole system, the permanent magnet motor 4 can be used as an electric motor to assist the water turbine assembly 3 in driving the fan 2 to rotate, and it can also be used as a generator to collect electrical energy, which can help the factory save energy.

[0059] Fourth, a Hall sensor 7 is installed on the motor housing 41, which can effectively detect the speed of the entire system and transmit the signal to the control system, thereby playing a speed regulation role.

[0060] Fifth, a temperature sensor 9 is installed on the motor housing 41. The signal of the temperature sensor 9 is connected to the control system, which can monitor the temperature of the first radial bearing 13, the second radial bearing 14 and the thrust bearing 15 in real time, and can detect heat generation in time.

[0061] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A water turbine with a permanent magnet motor, characterized in that, include: A main shaft (1), one end of which is equipped with a fan (2) and the other end with a water turbine assembly (3); A permanent magnet motor (4) includes a motor housing (41), a stator (42) and a rotor (43). The motor housing (41) has a shaft hole through which the main shaft (1) passes. The stator (42) is mounted on the inner side wall of the motor housing (41), and the rotor (43) is mounted on the main shaft (1). A water-spraying plate (5) is sleeved on the main shaft (1) and facing the fan (2). The water-spraying plate (5) is provided with a plurality of grooves (51). The plurality of grooves (51) are arranged at radial intervals along the main shaft (1). The motor housing (41) is provided with a protrusion (4111) that cooperates with the grooves (51). Water seal (6) is sleeved on the main shaft (1) and positioned toward the water turbine assembly (3).

2. The water turbine with a permanent magnet motor according to claim 1, characterized in that, The surface of the water-spraying plate (5) facing the motor housing (41) is formed as a concave inner surface (52), and the surface of the motor housing (41) facing the water-spraying plate (5) is formed as a convex outer surface (4112).

3. The water turbine with a permanent magnet motor according to claim 1, characterized in that, The motor housing (41) is provided with a Hall sensor (7) corresponding to the water-spinning plate (5), and the water-spinning plate (5) is provided with a plurality of detection slots (53) spaced apart along its circumference; and / or: A sealing structure (8) is provided between the water-spraying plate (5) and the main shaft (1).

4. The water turbine with a permanent magnet motor according to claim 1, characterized in that, The motor housing (41) includes a first end cap (411), a housing body (412), and a second end cap (413). The first end cap (411) and the second end cap (413) are connected to both ends of the housing body (412). The first end cap (411) is positioned towards the fan (2), and the second end cap (413) is positioned towards the water turbine assembly (3).

5. The water turbine with a permanent magnet motor according to claim 4, characterized in that, The housing body (412) is provided with at least one temperature sensor (9) extending into the motor housing (41); and / or: The housing body (412) is provided with a lubrication channel (4101) that communicates with the internal space of the motor housing (41), and the housing body (412) is also provided with a grease nipple (10) that seals the lubrication channel (4101).

6. The water turbine with a permanent magnet motor according to claim 4, characterized in that, A first oil seal (11) is provided between the first end cap (411) and the main shaft (1); and / or, a second oil seal (12) is provided between the second end cap (413) and the main shaft (1).

7. The water turbine with a permanent magnet motor according to claim 4, characterized in that, A first radial bearing (13) is provided between the end of the shell body (412) facing the fan (2) and the main shaft (1), and a second radial bearing (14) is provided between the end of the shell body (412) facing the water turbine assembly (3) and the main shaft (1); a thrust bearing (15) is also provided between the shell body (412) and the main shaft (1), and the thrust bearing (15) is located between the first radial bearing (13) and the second radial bearing (14).

8. The water turbine with a permanent magnet motor according to claim 7, characterized in that, The housing body (412) has an extension (41233) extending inward. The motor housing (41) also includes a third end cap (414) connected to one end of the extension (41233). The third end cap (414) abuts against one end of the thrust bearing (15). A spacer (16) is provided between the other end of the thrust bearing (15) and the second radial bearing (14).

9. The water turbine with a permanent magnet motor according to claim 4, characterized in that, The shell body (412) includes a first end plate (4121), a connecting cylinder (4122), and a second end plate (4123). The first end plate (4121) and the second end plate (4123) are connected to the two ends of the connecting cylinder (4122). The second end plate (4123) includes a first plate (41231) and a second plate (41232) spaced apart. The first plate (41231) is connected to the connecting cylinder (4122), and the second plate (41232) is connected to the water turbine shell (32) of the water turbine assembly (3). The second end cap (413) is installed between the first plate (41231) and the second plate (41232).

10. The water turbine with a permanent magnet motor according to claim 9, characterized in that, The water seal component (6) includes a water seal body (61) and a water seal end cap (62). The water seal end cap (62) is installed on the second plate (41232), and the water seal body (61) is installed inside the water seal end cap (62).

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