Permanent magnet water-cooled generator shell

Abstract

The utility model discloses a permanent magnet water-cooled generator shell, which comprises a barrel and a rear cover shell covering and fixed at one end of the barrel, a water-cooled cavity is arranged in the structure of the barrel, the water-cooled cavity is arranged around the central axis of the barrel, and a first water inlet pipe and a first water outlet pipe are arranged on the outer wall of the barrel. The first water inlet pipe and the first water outlet pipe communicate with the water cooling cavity. According to the utility model, the heat dissipation efficiency of the permanent magnet motor can be obviously improved, so that the heat dissipation requirement of the permanent magnet motor with large power and heavy load can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet motors, in particular to a housing of a permanent magnet water-cooled generator. Background Art

[0002] A permanent magnet motor is a high-efficiency and high-performance motor, which has been widely used in various industries at present. The permanent magnet motor mainly includes components such as a stator and a rotor. The rotor includes a rotor core and a permanent magnet material installed on the rotor core. The permanent magnet material is used to provide excitation to generate a driving torque between the permanent magnet material and the stator. The permanent magnet inside the rotor of the permanent magnet motor will generate a change in magnetic flux due to electromagnetic action during operation, and then form eddy current and hysteresis losses. These losses will generate a large amount of heat, resulting in an increase in the temperature of the permanent magnet motor.

[0003] To ensure the normal operation of the permanent magnet motor and extend its service life, it is necessary to cool and dissipate heat inside the permanent magnet motor. At present, the common heat dissipation method for permanent magnet motors is to set heat sinks on the motor housing, and increase the surface area of the motor through these heat dissipation structures to promote heat transfer and dissipation; or use a fan to provide continuous air flow to take away the heat from the surface of the motor, that is, to achieve air-cooled heat dissipation.

[0004] However, the heat dissipation efficiency of the heat sink is relatively low, and it can only be applied to permanent magnet motors with relatively small power and light load. Although air-cooled heat dissipation can achieve better cooling effects, setting up a fan or air duct externally for blowing and cooling generates relatively high noise and has a certain impact on the working environment of workers. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a housing of a permanent magnet water-cooled generator with significantly improved heat dissipation effect.

[0006] To solve the above technical problem, the housing of the permanent magnet water-cooled generator provided by the utility model adopts the following technical scheme:

[0007] A housing of a permanent magnet water-cooled generator includes a cylinder body and a rear cover shell covered and fixed at one end of the cylinder body. A water-cooling cavity is arranged inside the structure of the cylinder body itself. The water-cooling cavity is arranged around the central axis of the cylinder body. A first water inlet pipe and a first water outlet pipe are arranged on the outer wall of the cylinder body. Both the first water inlet pipe and the first water outlet pipe are communicated with the water-cooling cavity.

[0008] By adopting the above technical solution, cooling water is continuously introduced from the first water inlet pipe. The cooling water flows through the water-cooling cavity towards the first water outlet pipe, and the cooling water exchanges heat with the heat transferred from the water-cooling cavity, thereby achieving the effect of cooling the motor rotor inside the cylinder. Since there is only the water-cooling cavity wall between the cooling water and the motor rotor, and the heat transfer coefficient of water is greater than that of air, the heat transfer rate is relatively high, enabling a higher heat dissipation efficiency, and it can meet the heat dissipation requirements of permanent magnet motors with relatively large power and heavy loads. And only by installing a circulating water cooler outside, the cooling water can be continuously provided in the water-cooling cavity for heat dissipation. Compared with installing a fan, the circulating water cooler can be set relatively far away after being connected by a water pipe, occupying less space at the site where the permanent magnet motor is located; and compared with the fan and the air duct, the noise is also smaller, having less impact on the on-site working environment.

[0009] Optionally, the flowing path of the water-cooling cavity is curved.

[0010] By adopting the above technical solution, setting the water flow path of the water-cooling cavity to be curved can increase the flow path and residence time of the cooling water in the water-cooling cavity, thereby helping to enhance the heat dissipation effect. And the S-shaped cavity can enhance the overall strength of the cylinder body, enabling the cylinder wall of the cylinder body to be provided with a water-cooling cavity while being able to stably carry the permanent magnet stator and rotor.

[0011] Optionally, a plurality of guiding blocks are fixedly arranged inside the water-cooling cavity. The plurality of guiding blocks are arranged in a uniformly divided annular arrangement. The plurality of guiding blocks divide the water-cooling cavity into a plurality of spaces. The plurality of guiding blocks are all provided with flow ports, and the flow ports of two adjacent guiding blocks are arranged away from each other along the axis of the cylinder body.

[0012] By adopting the above technical solution, through the plurality of guiding blocks and the alternately arranged flow ports, the water flow path in the water-cooling cavity forms an S shape, that is, a curved shape, and the guiding blocks can improve the strength of the shell.

[0013] Optionally, the rear cover shell is fixedly connected to the cylinder body by a plurality of fixing bolts. The plurality of fixing bolts are respectively inserted and threadedly connected to the corresponding guiding blocks.

[0014] By adopting the above technical solution, through the fixing bolts, the rear cover shell is detachably connected to the cylinder body, facilitating the opening of the rear cover shell for overhauling the permanent magnet motor. And through the arrangement of the guiding blocks, when the water-cooling cavity is as large as possible, a tightening foundation can be provided for the fixing bolts, so that the rear cover shell can be more stably and firmly installed on the cylinder body.

[0015] Optionally, a second water inlet pipe and a second water outlet pipe are further provided on the outer wall of the cylinder body. Both the second water inlet pipe and the second water outlet pipe are far away from the first water inlet pipe. A return pipe is detachably connected between the second water inlet pipe and the second water outlet pipe, and the return pipe can also be installed between the first water inlet pipe and the first water outlet pipe.

[0016] By adopting the above technical solution, during on-site installation, after the permanent magnet motor is installed, since the second water inlet pipe and the second water outlet pipe are arranged far away from the first water inlet pipe and the first water outlet pipe, by choosing to install the return pipe between the first water inlet pipe and the first water outlet pipe or between the second water inlet pipe and the second water outlet pipe, it is possible to adjust from which side of the cylinder body to supply and discharge water; and the water supply and discharge outlets can also be flexibly adjusted midway, greatly improving the installation convenience of the permanent magnet motor and the circulating water cooler.

[0017] Optionally, the inner walls of the pipe orifices of the second water inlet pipe, the second water outlet pipe, the first water inlet pipe and the first water outlet pipe are all provided with threads. Installation joints are threadedly connected to both ends of the return pipe. The two installation joints respectively penetrate and are threadedly connected to the second water inlet pipe and the second water outlet pipe. The thread directions of the return pipe orifices are all opposite to the thread directions of the second water inlet pipe, the second water outlet pipe, the first water inlet pipe and the first water outlet pipe.

[0018] By adopting the above technical solution, when the return pipe is installed between the second water inlet pipe and the second water outlet pipe, one of the installation joints is inserted into one end of the second water inlet pipe and the return pipe at the same time, and the other installation joint is inserted into the other end of the second water outlet pipe and the return pipe at the same time. Since the thread directions of the return pipe orifices are all opposite to the thread directions of the second water inlet pipe and the second water outlet pipe, rotating the two installation joints can make the return pipe and the second water inlet pipe and the second water outlet pipe be screwed in opposite directions and fixed, and the water is locked and sealed by thread locking. The same applies to the return pipe and the first water inlet pipe and the first water outlet pipe.

[0019] Optionally, the rear cover shell is provided with a plurality of heat dissipation fins.

[0020] By adopting the above technical solution, the cylinder body can only dissipate heat from the permanent magnet stator and rotor in the circumferential direction, and the heat dissipation fins of the rear cover shell further increase the heat dissipation area and efficiency.

[0021] Optionally, an installation ring is detachably connected to the opening edge of the end of the cylinder body far away from the rear cover.

[0022] Optionally, the outer diameter of the installation ring is larger than the outer diameter of the cylinder body, and a plurality of installation screw holes are circumferentially arranged on the outer edge of the installation ring.

[0023] By adopting the above technical solution, the mounting ring can pass through a plurality of mounting bolts to fixedly mount the permanent magnet motor. Due to the different mounting positions of the permanent magnet motor and different power interfaces, the sizes of the mounting diameters of the permanent magnet motor are also different. Therefore, detachably connecting the mounting ring to the cylinder body can facilitate the installation of mounting rings of different sizes on the cylinder body, so as to improve the convenience and practicality of mounting the permanent magnet motor.

[0024] Optionally, a plurality of connecting rods are fixedly arranged between the mounting ring and the rear cover shell.

[0025] By adopting the above technical solution, the plurality of connecting rods can strengthen the connection strength between the mounting ring, the rear cover shell and the cylinder body, and reduce the loosening of the bolts between the mounting ring, the rear cover shell and the cylinder body during the vibration generated by the high-speed operation of the permanent magnet motor.

[0026] In summary, the utility model includes at least one of the following beneficial technical effects:

[0027] 1. There is only the water-cooling cavity wall between the cooling water and the motor rotor, and the heat transfer coefficient of water is greater than that of air, so the heat transfer rate is relatively high, and a higher heat dissipation efficiency can be achieved, which can meet the heat dissipation requirements of permanent magnet motors with larger power and heavier loads; and only by installing a circulating water cooler outside, cooling water can be continuously provided in the water-cooling cavity for heat dissipation. Compared with installing a fan, the circulating water cooler can be set relatively far away after being connected by a water pipe, occupying less space at the site where the permanent magnet motor is located; and compared with the fan and the air duct, the noise is also smaller, having less impact on the on-site working environment;

[0028] 2. Setting the water flow path of the water-cooling cavity as an S shape can increase the flow path and residence time of the cooling water in the water-cooling cavity, thus helping to enhance the heat dissipation effect. And the S-shaped cavity can enhance the overall strength of the cylinder body, enabling the cylinder wall of the cylinder body to be provided with a water-cooling cavity while stably carrying the permanent magnet stator and rotor;

[0029] 3. During on-site installation, after the permanent magnet motor is installed, by choosing to install the return pipe between the first water inlet pipe and the first water outlet pipe or between the second water inlet pipe and the second water outlet pipe, the water supply and drainage from which side of the cylinder body can be adjusted; and the water supply and drainage outlets can also be flexibly adjusted during the process, greatly improving the installation convenience of the permanent magnet motor and the circulating water cooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of the utility model.

[0031] Figure 2 is Figure 1 a sectional structural schematic diagram along the A-A line.

[0032] Figure 3 It is a schematic perspective view of the cylinder body in the present utility model.

[0033] Figure 4 It is a schematic installation structure diagram of the cylinder body and the return pipe in the present utility model.

[0034] Explanation of reference numerals: 1. Cylinder body; 11. Water-cooling cavity; 12. First water inlet pipe; 13. First water outlet pipe; 14. Second water inlet pipe; 15. Second water outlet pipe; 2. Rear cover shell; 21. Fixed bolt; 3. Guide block; 31. Circulation port; 4. Return pipe; 5. Installation joint; 51. Rotating nut; 6. Heat sink; 7. Installation ring; 71. Installation screw hole; 8. Connecting rod; 81. Limiting ring; 82. Threaded hole. Specific embodiments

[0035] The following will further elaborate on the present utility model in conjunction with the attached Figures 1-4 drawings.

[0036] An embodiment of the present utility model discloses a permanent magnet water-cooled generator housing. Referring to Figure 1 , the permanent magnet water-cooled generator housing includes a cylinder body 1, a rear cover shell 2 and an installation ring 7. The cylinder body 1 is cylindrical, the installation ring 7 is fixedly arranged at one end of the cylinder body 1, and the rear cover shell 2 is fixedly arranged at the other end of the cylinder body 1. The material of the installation ring 7 is steel to have better support strength; the materials of the cylinder body 1 and the rear cover shell 2 are aluminum to better dissipate heat.

[0037] Referring to Figure 1 and Figure 2 , the rear cover shell 2 is placed on one end face of the cylinder body 1. A plurality of fixed bolts 21 penetrate through the outer edge of the rear cover shell 2. The plurality of fixed bolts 21 are arranged at intervals around the central axis of the cylinder body 1, and the plurality of fixed bolts 21 are inserted and threadedly connected to the end face of the cylinder body 1. Through the fixed bolts 21, the rear cover shell 2 is detachably connected to the cylinder body 1, so as to facilitate opening the rear cover shell 2 for overhauling the permanent magnet motor. A rabbet structure is provided at the opening edge of one end of the cylinder body 1 and the placement position of the rear cover shell 2 to ensure the concentricity of the cylinder body 1 and the rear cover shell 2.

[0038] Referring to Figure 1 and Figure 2 , the installation ring 7 is circular, the installation ring 7 is placed on the opening at the other end of the cylinder body 1 and is coaxially arranged with the cylinder body 1. The installation ring 7 is fixedly connected to the cylinder body 1 through a plurality of bolts, so that the installation ring 7 is detachably connected to the cylinder body 1. A rabbet structure is provided at the placement position of the installation ring 7 and the cylinder body 1 to ensure the concentricity of the cylinder body 1 and the installation ring 7. The outer diameter of the installation ring 7 is larger than the outer diameter of the cylinder body 1, and a plurality of installation screw holes 71 are circumferentially formed on the outer edge of the installation ring 7.

[0039] The mounting ring 7 can pass through a plurality of mounting bolts to fixedly mount the permanent magnet motor. Due to the different mounting positions of the permanent magnet motor and different power interfaces, the sizes of the mounting diameters of the permanent magnet motor are also different. Therefore, detachably connecting the mounting ring 7 to the cylinder body 1 can facilitate the installation of mounting rings 7 of different sizes on the cylinder body 1, so as to improve the convenience and practicality of mounting the permanent magnet motor.

[0040] Refer to Figure 1 and Figure 2 , a plurality of connecting rods 8 are fixedly arranged between the mounting ring 7 and the rear cover shell 2. A plurality of limiting rings 81 are fixedly connected to the outer edge of the rear cover shell 2. The plurality of limiting rings 81 are arranged at intervals around the central axis of the rear cover shell 2. The number of the connecting rods 8 corresponds to that of the limiting rings 81; the mounting ring 7 is provided with threaded holes 82 corresponding to the number and positions of the plurality of limiting rings 81. The connecting rods 8 are steel bolts. The connecting rods 8 pass through the limiting rings 81. The screw heads of the connecting rods 8 abut against the side surfaces of the limiting rings 81 far away from the mounting ring 7. The connecting rods 8 simultaneously pass through the threaded holes 82 of the mounting ring 7 and are threadedly connected to the mounting ring 7 to fixedly mount the connecting rods 8 between the mounting ring 7 and the rear cover shell 2. The plurality of connecting rods 8 can enhance the connection strength among the mounting ring 7, the rear cover shell 2 and the cylinder body 1, and reduce the loosening of the bolts among the mounting ring 7, the rear cover shell 2 and the cylinder body 1 during the vibration generated by the high-speed operation of the permanent magnet motor.

[0041] Refer to Figure 1 and Figure 3 , for better cooling and heat dissipation, a water cooling cavity 11 is arranged inside the cylinder wall of the cylinder body 1. The water cooling cavity 11 is arranged around the central axis of the cylinder body 1. A first water inlet pipe 12 and a first water outlet pipe 13 are fixedly connected to the outer wall of the cylinder body 1. The first water inlet pipe 12 and the first water outlet pipe 13 are both communicated with the water cooling cavity 11. The first water inlet pipe 12 and the first water outlet pipe 13 are arranged close to each other.

[0042] Refer to Figure 1 and Figure 3 , a plurality of guide blocks 3 are fixedly connected inside the water cooling cavity 11. The plurality of guide blocks 3 are arranged at intervals around the central axis of the cylinder body 1. The plurality of guide blocks 3 divide the water cooling cavity 11 into a plurality of spaces. The plurality of guide blocks 3 are all provided with flow ports 31. The flow ports 31 of two adjacent guide blocks 3 are arranged away from each other along the axis of the cylinder body 1. A plurality of fixing bolts 21 are respectively inserted and threadedly connected to the corresponding guide blocks 3.

[0043] Cooling water is continuously introduced from the first water inlet pipe 12. The cooling water flows through the water cooling cavity 11 to the first water outlet pipe 13. The cooling water exchanges heat with the heat transferred to the water cooling cavity 11, thereby achieving the effect of cooling the motor rotor in the cylinder body 1. Through multiple guiding blocks 3 and the staggered flow ports 31, the water flow path in the water cooling cavity 11 forms an S shape. The S-shaped water cooling cavity 11 can increase the flow path and residence time of the cooling water in the water cooling cavity 11, thereby helping to enhance the heat dissipation effect; and the multiple guiding blocks 3 can enhance the overall strength of the cylinder body 1, enabling the cylinder wall of the cylinder body 1 to be provided with the water cooling cavity 11 while being able to stably carry the permanent magnet stator and rotor; and through the arrangement of the guiding blocks 3, when the water cooling cavity 11 is as large as possible, a tightening base can be provided for the fixing bolts 21, so that the rear cover shell 2 can be installed on the cylinder body 1 more stably and firmly.

[0044] Since there is only the cavity wall of the water cooling cavity 11 between the cooling water and the motor rotor, and the heat transfer coefficient of water is greater than that of air, the heat transfer rate is relatively high, and a higher heat dissipation efficiency can be achieved, which can meet the heat dissipation requirements of permanent magnet motors with larger power and heavier loads. And only by setting a circulating water cooler outside, the cooling water in the water cooling cavity 11 can be continuously provided for heat dissipation. Compared with setting a fan, the circulating water cooler can be set relatively far away after being connected by a water pipe, occupying less space at the site where the permanent magnet motor is located; and compared with the fan and the air duct, the noise is also smaller, having less impact on the on-site working environment.

[0045] Refer to Figure 1 and Figure 3 , in order to improve the installation convenience of the permanent magnet motor and the circulating water cooler, a second water inlet pipe 14 and a second water outlet pipe 15 are further provided on the outer wall of the cylinder body 1. Both the second water inlet pipe 14 and the second water outlet pipe 15 are communicated with the water cooling cavity 11. The second water inlet pipe 14 and the second water outlet pipe 15 are arranged close to each other, and both the second water inlet pipe 14 and the second water outlet pipe 15 are arranged far away from the first water inlet pipe 12 and the first water outlet pipe 13. A return pipe 4 is detachably connected between the second water inlet pipe 14 and the second water outlet pipe 15, and the return pipe 4 is simultaneously communicated with the second water inlet pipe 14 and the second water outlet pipe 15. The return pipe 4 can also be installed between the first water inlet pipe 12 and the first water outlet pipe 13.

[0046] During on-site installation, after the permanent magnet motor is installed, since the second water inlet pipe 14 and the second water outlet pipe 15 are arranged far away from the first water inlet pipe 12 and the first water outlet pipe 13, by choosing to install the return pipe 4 between the first water inlet pipe 12 and the first water outlet pipe 13 or between the second water inlet pipe 14 and the second water outlet pipe 15, the water supply and discharge side of the cylinder body 1 can be adjusted; and the water supply and discharge outlets can also be flexibly adjusted during the process, greatly improving the installation convenience of the permanent magnet motor and the circulating water cooler.

[0047] Refer toFigure 1 and Figure 4 For facilitating the fixed installation of the return pipe 4 on the second water inlet pipe 14 and the second water outlet pipe 15 or the first water inlet pipe 12 and the first water outlet pipe 13, threads are provided on the inner walls of both ends of the return pipe 4. Installation joints 5 are threadedly connected to both ends of the return pipe 4. The installation joint 5 is a cylindrical structure. A rotating nut 51 is sleeved and fixedly connected to the middle of the installation joint 5. Threads are provided on the outer walls of both ends of the installation joint 5, and the thread directions at both ends of the installation joint 5 are opposite. Threads are provided on the inner walls of the pipe orifices of the second water inlet pipe 14, the second water outlet pipe 15, the first water inlet pipe 12, and the first water outlet pipe 13, and the thread directions of the second water inlet pipe 14, the second water outlet pipe 15, the first water inlet pipe 12, and the first water outlet pipe 13 are all opposite to the thread direction of the orifice of the return pipe 4. The two installation joints 5 respectively pass through and are threadedly connected to the second water inlet pipe 14 and the second water outlet pipe 15.

[0048] When installing the return pipe 4 between the second water inlet pipe 14 and the second water outlet pipe 15, one of the installation joints 5 is inserted into one end of the second water inlet pipe 14 and the return pipe 4 at the same time, and the other installation joint 5 is inserted into the other end of the second water outlet pipe 15 and the return pipe 4 at the same time. Since the thread directions of the orifices of the return pipe 4 are all opposite to the thread directions of the second water inlet pipe 14 and the second water outlet pipe 15, rotating the two installation joints 5 can make the return pipe 4 and the second water inlet pipe 14 and the second water outlet pipe 15 be screwed together in opposite directions and fixed, and water is sealed by thread locking. The same applies to the return pipe 4 and the first water inlet pipe 12 and the first water outlet pipe 13.

[0049] Referring to Figure 1 , for further improving the heat dissipation effect, the rear cover shell 2 is provided with a plurality of heat dissipation fins 6, and the plurality of heat dissipation fins 6 are arranged at intervals around the central axis of the rear cover shell 2. The cylindrical body 1 can only dissipate heat from the permanent magnet stator and rotor circumferentially, and the heat dissipation fins 6 of the rear cover shell 2 further increase the heat dissipation area and efficiency.

[0050] The implementation principle of a permanent magnet water-cooled generator housing in an embodiment of the present utility model is as follows: Cooling water is continuously introduced from the first water inlet pipe 12, and the cooling water flows to the first water outlet pipe 13 through the water-cooled cavity 11. The cooling water exchanges heat with the heat transferred from the water-cooled cavity 11; and the water flow path of the water-cooled cavity 11 is set as an S shape, which can increase the flow path and residence time of the cooling water in the water-cooled cavity 11, thereby helping to enhance the heat dissipation effect.

[0051] Since there is only the wall of the water cooling cavity 11 between the cooling water and the motor rotor, and the heat transfer coefficient of water is greater than that of air, the heat transfer rate is relatively high, enabling a higher heat dissipation efficiency and meeting the heat dissipation requirements of permanent magnet motors with relatively large power and heavy loads. Moreover, by simply installing a circulating water cooler outside, cooling water can be continuously supplied to the water cooling cavity 11 for heat dissipation. Compared with installing a fan, the circulating water cooler can be installed at a relatively far distance after being connected by a water pipe, occupying less space at the site where the permanent magnet motor is located; and compared with a fan and an air duct, it also generates less noise and has less impact on the on-site working environment.

[0052] The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A permanent magnet water-cooled generator housing, characterized in that: It includes a cylinder body (1) and a rear cover shell (2) covered and fixed to one end of the cylinder body (1). A water cooling cavity (11) is provided inside the structure of the cylinder body (1) itself. The water cooling cavity (11) is arranged around the central axis of the cylinder body (1). A first water inlet pipe (12) and a first water outlet pipe (13) are provided on the outer wall of the cylinder body (1). Both the first water inlet pipe (12) and the first water outlet pipe (13) are communicated with the water cooling cavity (11).

2. The housing of a permanent magnet water-cooled generator according to claim 1, characterized in that: The flowing path of the water in the water cooling cavity (11) is curved.

3. A permanent magnet water-cooled generator housing according to claim 2, characterized in that: A plurality of guide blocks (3) are fixedly arranged inside the water cooling cavity (11). The plurality of guide blocks (3) are arranged in an evenly distributed circular pattern. The plurality of guide blocks (3) divide the water cooling cavity (11) into a plurality of spaces. A flow-through opening (31) is provided in each of the plurality of guide blocks (3). The flow-through openings (31) of two adjacent guide blocks (3) are arranged away from each other along the axis of the cylinder body (1).

4. A permanent magnet water-cooled generator housing according to claim 3, characterized in that: The rear cover shell (2) is fixedly connected to the cylinder body (1) through a plurality of fixing bolts (21). The plurality of fixing bolts (21) are respectively inserted and threadedly connected to the corresponding guide blocks (3).

5. A permanent magnet water-cooled generator housing according to any one of claims 1-4, characterized in that: A second water inlet pipe (14) and a second water outlet pipe (15) are further provided on the outer wall of the cylinder body (1). Both the second water inlet pipe (14) and the second water outlet pipe (15) are away from the first water inlet pipe (12). A return pipe (4) is detachably connected between the second water inlet pipe (14) and the second water outlet pipe (15). The return pipe (4) can also be installed between the first water inlet pipe (12) and the first water outlet pipe (13).

6. The outer shell of a permanent magnet water-cooled generator according to claim 5, characterized in that: Threads are provided on the inner walls of the pipe orifices of the second water inlet pipe (14), the second water outlet pipe (15), the first water inlet pipe (12), and the first water outlet pipe (13). Installation joints (5) are threadedly connected to both ends of the return pipe (4). The two installation joints (5) are respectively inserted and threadedly connected to the second water inlet pipe (14) and the second water outlet pipe (15). The thread directions of the orifices of the return pipe (4) are opposite to the thread directions of the second water inlet pipe (14), the second water outlet pipe (15), the first water inlet pipe (12), and the first water outlet pipe (13).

7. A permanent magnet water-cooled generator housing according to any one of claims 1-4, characterized in that: The rear cover shell (2) is provided with a plurality of heat dissipation fins (6).

8. A permanent magnet water-cooled generator housing according to any one of claims 1-4, characterized in that: A mounting ring (7) is detachably connected to the opening edge of the end of the cylinder body (1) away from the rear cover.

9. The housing of a permanent magnet water-cooled generator according to claim 8, wherein: The outer diameter of the mounting ring (7) is larger than the outer diameter of the cylinder body (1). A plurality of mounting screw holes (71) are circumferentially formed on the outer edge of the mounting ring (7).

10. A permanent magnet water-cooled generator housing according to claim 8, characterized in that: A plurality of connecting rods (8) are fixedly arranged between the mounting ring (7) and the rear cover shell (2).

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