Special low-noise three-phase asynchronous motor for cooling tower

Abstract

The invention discloses a special low-noise three-phase asynchronous motor for a cooling tower, which comprises a motor and a mounting mechanism, the motor is mounted at the upper end of the mounting mechanism, the motor comprises a casing, a terminal, an inner stator core, a stator winding and a permanent magnet outer rotor, and the terminal is arranged outside the casing. Each iron core is formed by superposing a plurality of silicon steel sheets, an oxide layer is coated between the silicon steel sheets of each iron core, the oxide layers are used for blocking an eddy current path and reducing eddy current loss, the connecting cylinders made of epoxy resin are connected between the three groups of iron cores, micro-vibration between the iron cores is reduced, and therefore electromagnetic noise of a stator winding and a permanent magnet pole is reduced. And through the ventilation openings and the connecting plates arranged among the three groups of outer rotor magnet yokes, a relatively large flowing space exists between the inner stator iron core and the permanent magnet outer rotor, heat is rapidly conducted outwards, and the heat is prevented from being accumulated between the inner stator iron core and the permanent magnet outer rotor.

Description

Technical Field

[0001] This invention relates to the field of electric motors, specifically to a low-noise three-phase asynchronous motor for cooling towers. Background Technology

[0002] A cooling tower is a device that uses water as a circulating coolant to absorb heat from a system and release it into the atmosphere to lower the water temperature. When a cooling tower is working, it needs to use a special low-noise three-phase asynchronous motor. This three-phase asynchronous motor is usually installed outdoors and located at the top of the cooling tower to drive the fan. The motor is exposed to environmental factors such as humidity and dust. The motor adopts a high-protection-level structural design, generally with a protection level of IP54 or higher, which can effectively prevent dust from entering the motor and also has a certain degree of protection against water splashes.

[0003] The prior art, disclosed in CN114069904A, discloses a high-efficiency, low-noise brushless permanent magnet motor, comprising a stator winding, a stator core, and a rotor core. A second-phase insulator is installed on the inner side of the stator core, and the stator winding is installed on the inner side of the second-phase insulator. A first-phase insulator is installed on the inner side of the stator winding, and a lead-side frame is installed at the front end of the stator core. This invention provides a high-efficiency, low-noise brushless permanent magnet motor with optimized air gap magnetic field design. This includes a stator tooth yoke structure and a rotor layout structure. The stator inner diameter adopts a non-uniform, unequal design with rounded holes in the teeth. The rotor adopts a new non-uniform, unequal air gap design with a "flat cut" and inverted "bow" shape. The stator and rotor, when combined, result in a locally unequal air gap in a circular array, which effectively reduces cogging torque and makes the back EMF waveform closer to a sine wave, thus improving efficiency and reducing vibration. However, the above-disclosed technical solutions still have the following shortcomings: the stator core and permanent magnet outer rotor inside the motor are distributed over a relatively long length. When the windings and permanent magnet poles generate a magnetic field to drive the output shaft to rotate, a lot of heat is generated. The heat is difficult to dissipate quickly through the air gap between the stator core and the permanent magnet outer rotor, causing heat to accumulate between the stator core and the permanent magnet outer rotor, increasing losses and reducing the efficiency of driving the output shaft to rotate. Furthermore, the motor is directly installed on the top of the cooling tower to drive the fan, which generates a lot of vibration and is prone to motor resonance, resulting in a lot of noise. Summary of the Invention

[0004] Therefore, in order to overcome the above-mentioned shortcomings, the present invention provides a low-noise three-phase asynchronous motor specifically for cooling towers.

[0005] This invention is implemented as follows: a low-noise three-phase asynchronous motor specifically designed for cooling towers is constructed. The device includes a motor and a mounting mechanism, with the motor mounted on the upper end of the mounting mechanism. The motor includes a housing, terminals, an inner stator core, stator windings, and a permanent magnet outer rotor. Terminals are provided on the outside of the housing and are electrically connected to the stator windings wound on the inner stator core. Both the inner stator core and the stator windings are located inside the permanent magnet outer rotor, which is mounted on the inner edge of the housing. The inner stator core consists of an iron core, inner stator magnetic poles, connecting cylinders, ventilation openings, and bolts. The inner stator magnetic poles are connected to the outside of the iron core, and stator windings are wound and installed on the iron core. There are three sets of iron cores, and a connecting cylinder is set between two iron cores. The connecting cylinder has a ventilation opening inside. The three sets of iron cores and the two connecting cylinders are connected and fixed by three bolts. The three sets of iron cores and the two connecting cylinders are all located on the same axis.

[0006] Preferably, the permanent magnet outer rotor consists of an outer rotor yoke, permanent magnet poles, connecting rods, and connecting plates. The outer rotor yoke is installed on the inner edge of the housing, and permanent magnet poles are provided on the inner wall of the outer rotor yoke. The front end of the outer rotor yoke is welded to the outer end of the connecting rod, and an output shaft is welded to the inner end of the connecting rod. The outer rotor yoke and permanent magnet poles are both located outside the inner stator core and stator windings. Connecting plates are connected between each pair of the three sets of outer rotor yokes.

[0007] Preferably, bearings are installed at both ends of the output shaft, with the front bearing installed inside the bearing seat on the mounting mechanism and the rear bearing located inside the rear end of the housing.

[0008] Preferably, a corrugated plate is embedded in the inner wall of the housing, and the corrugated plate is connected to an inner insert plate that is plugged into the inner wall of the housing. The inner insert plate is connected to a heat sink welded to the outer surface of the housing. A fan is also installed at the rear end of the housing, and the rear end of the output shaft drives the fan to rotate.

[0009] Preferably, the outer surface of the housing is also provided with a locking shell and is an integrated structure. A heat sink is also installed at the rear end of the housing. A long bolt passes through the inside of the heat sink and is threaded through the locking shell to lock and fix the heat sink to the rear end of the housing. The fan is located inside the heat sink. The long bolt is also threadedly connected to the upper mounting seat provided on the mounting mechanism to lock and fix the upper mounting seat to the front end of the housing.

[0010] Preferably, the upper mounting base has four first lifting lugs equidistantly arranged in a ring shape on its edge, and a lower mounting base is also provided below the upper mounting base. The lower mounting base has four second lifting lugs equidistantly arranged in a ring shape on its edge. Fixing bolts pass through the first and second lifting lugs, and the upper mounting base and the lower mounting base are connected by fixing bolts. The output shaft passes through the middle of the upper mounting base and the lower mounting base.

[0011] Preferably, the lower end of the fixing bolt is also provided with a nut and threaded connection, and the lower mounting seat is locked and fixed to the top of the cooling tower by the cooperation of the fixing bolt and the nut.

[0012] Preferably, a spring is provided on the outside of the fixing bolt, and the spring is connected between the upper mounting base and the lower mounting base.

[0013] Preferably, a bellows is connected between the upper mounting base and the lower mounting base. The upper insertion ring at the upper end of the bellows is embedded inside the lower end of the upper mounting base, and the lower connecting ring at the lower end of the bellows is embedded inside the upper end of the lower mounting base. The bellows is located outside the bearing housing, and the output shaft passes through the center of the lower connecting ring with a clearance fit.

[0014] Preferably, a rotating plate is also installed on the lower surface of the upper mounting base, and the rotating plate supports the bottom surface of the edge of the upper insertion ring embedded in the lower end of the upper mounting base.

[0015] The present invention has the following advantages: By providing an improved low-noise three-phase asynchronous motor specifically for cooling towers, the present invention has the following improvements compared with similar equipment: The low-noise three-phase asynchronous motor for cooling towers described in this invention features an inner stator core made of silicon steel sheets stacked together. Each silicon steel sheet in the core is coated with an oxide layer to block eddy current paths, reducing eddy current losses. An epoxy resin connecting cylinder connects the three sets of cores, reducing micro-vibrations between the cores and thus lowering electromagnetic noise between the stator windings and permanent magnet poles. Furthermore, eight annular ventilation openings on the connecting cylinder and connecting plates between the three sets of outer rotor yokes create a large flow space between the inner stator core and the permanent magnet outer rotor, rapidly transferring heat outwards and preventing heat accumulation between them.

[0016] The low-noise three-phase asynchronous motor for cooling towers described in this invention features an installation mechanism with fixing bolts between four first lifting lugs and four second lifting lugs. Locking nuts are also provided at the lower end of the first lifting lugs and the upper and lower ends of the second lifting lugs, suspending and supporting the upper and lower mounting bases. Springs located on the outside of the four bolts reduce the resonance generated by the lower mounting base installed on the top of the cooling tower, thus reducing the vibration transmitted to the motor and reducing the noise generated by resonance during motor operation.

[0017] The low-noise three-phase asynchronous motor for cooling towers described in this invention incorporates a bellows structure that is wider at the top and narrower at the bottom. This not only improves the sealing of the connection between the output shaft and the internal casing, preventing humid air from entering the casing and affecting the motor's operation, but also absorbs vibration energy through the deformation of the bellows itself when the lower mounting base resonates. This reduces vibration transmission and weakens the transmission of vibration from the lower mounting base to the upper mounting base, thus preventing motor resonance and noise. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the low-noise three-phase asynchronous motor structure of the present invention; Figure 2 This is a schematic diagram of the disassembled motor structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the motor of the present invention; Figure 4 This is a schematic diagram of the three-dimensional disassembled structure of the inner stator core of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the permanent magnet external rotor of the present invention; Figure 6 This is a three-dimensional structural diagram of the installation mechanism of the present invention; Figure 7 This is a front view schematic diagram of the installation mechanism of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the bellows of the present invention.

[0019] The components include: 1. Motor; 11. Housing; 111. Locking housing; 112. Corrugated plate; 113. Heat sink; 114. Inner insert plate; 12. Terminal; 13. Inner stator core; 131. Core; 132. Inner stator pole; 133. Connecting cylinder; 134. Ventilation opening; 135. Bolt; 14. Stator winding; 15. Permanent magnet outer rotor; 151. Outer rotor yoke; 152. Permanent magnet pole; 153. Connecting rod. ; 154. Connecting plate; 16. Output shaft; 161. Bearing; 17. Fan; 18. Heat sink; 19. Long bolt; 2. Mounting mechanism; 21. Upper mounting base; 211. First lifting lug; 212. Rotating plate; 22. Lower mounting base; 221. Second lifting lug; 23. Fixing bolt; 231. Spring; 232. Nut; 24. Bellows; 241. Upper insert ring; 242. Lower connecting ring; 25. Bearing seat. Detailed Implementation

[0020] The following will be combined with the appendix Figure 1-8This invention will be described in detail, and the technical solutions in the embodiments of this invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0021] Please see Figure 1 , 4 5. The present invention provides a low-noise three-phase asynchronous motor for cooling towers, comprising a motor 1 and a mounting mechanism 2, wherein the motor 1 is mounted on the upper end of the mounting mechanism 2; the motor 1 comprises a housing 11, a terminal block 12, an inner stator core 13, a stator winding 14, and a permanent magnet outer rotor 15. The terminal block 12 is provided on the outside of the housing 11, and the terminal block 12 is electrically connected to the stator winding 14 wound and mounted on the inner stator core 13. Both the inner stator core 13 and the stator winding 14 are located on the permanent magnet outer rotor. Inside the housing 11, the permanent magnet outer rotor 15 is mounted on the inner edge. The inner stator core 13 consists of a core 131, inner stator magnetic poles 132, a connecting cylinder 133, a vent 134, and bolts 135. The inner stator magnetic poles 132 are externally connected to the core 131, and stator windings 14 are wound and installed on the core 131. There are three sets of cores 131, and a connecting cylinder 133 is provided between two cores 131. A vent is provided inside the connecting cylinder 133. 134. Three sets of iron cores 131 and two connecting cylinders 133 are connected and fixed by three bolts 135. The three sets of iron cores 131 and two connecting cylinders 133 are all located on the same axis. The permanent magnet outer rotor 15 is composed of an outer rotor yoke 151, permanent magnet poles 152, connecting rods 153 and connecting plate 154. The outer rotor yoke 151 is installed on the inner edge of the housing 11. Permanent magnet poles 152 are provided on the inner wall of the outer rotor yoke 151. The front end of the outer rotor yoke 151 is connected to the connecting rod 154. The outer ends of the three outer rotors are welded together, and the inner end of the connecting rod 153 is welded with an output shaft 16. The outer rotor yoke 151 and the permanent magnet pole 152 are located outside the inner stator core 13 and the stator winding 14. The three sets of outer rotor yokes 151 are connected by connecting plates 154 between each pair. The output shaft 16 is equipped with bearings 161 at both ends. The front bearing 161 is installed inside the bearing seat 25 set on the mounting mechanism 2, and the rear bearing 161 is set inside the rear end of the housing 11. It should be noted that the iron core 131 is made of silicon steel sheets and is formed by stacking multiple silicon steel sheets. An oxide layer is coated between the silicon steel sheets of each iron core 131. This oxide layer is used to block eddy current paths, reducing eddy current losses and directly improving the operating efficiency of the motor 1. Simultaneously, the iron core 131 is equipped with three sets of interconnected outer rotor yokes 151. Through the interaction of the inner stator iron core 13, stator windings 14, and permanent magnet poles 152, the outer rotor yokes 151 are driven to rotate. During this process, epoxy resin material... The connecting cylinder 133 is connected between the three sets of iron cores 131, reducing the micro-vibration between the iron cores 131 and thus reducing the electromagnetic noise between the stator winding 14 and the permanent magnet pole 152. Furthermore, the connecting cylinder 133 has eight vents 134 arranged in a ring on it and a connecting plate 154 between the three sets of outer rotor yokes 151, which makes a large flow space between the inner stator iron core 13 and the permanent magnet outer rotor 15, so that the heat can be quickly conducted outward and the heat can be avoided from accumulating between the inner stator iron core 13 and the permanent magnet outer rotor 15. The outer surface of the inner stator magnetic pole 132 is embedded with a permanent magnet made of neodymium iron boron. The permanent magnet poles 152 on the outer rotor yoke 151 are arranged alternately in N-S-N-S... The polarities of the inner stator magnetic pole 132 and the permanent magnet pole 152 are opposite (S to N, N to S), the magnetic flux path is short, the magnetic resistance is small, and the efficiency of the outer rotor yoke 151 driving the output shaft 16 to rotate is improved. Bolt 135 is made of epoxy resin. The connection of three bolts 135 can improve the convenience and stability of the connection between the three sets of iron cores 131 and the two connecting cylinders 133.

[0022] Please see Figure 2 and 3 The inner wall of the housing 11 is embedded with a corrugated plate 112, and the corrugated plate 112 is connected to an inner insert plate 114 that is inserted and installed on the inner wall of the housing 11. The inner insert plate 114 is connected to a heat sink 113 welded to the outer surface of the housing 11. A fan 17 is also installed at the rear end of the housing 11, and the rear end of the output shaft 16 drives the fan 17 to rotate. A locking shell 111 is also provided on the outer surface of the housing 11 and is an integral structure. A heat sink 18 is also installed at the rear end of the housing 11. A long bolt 19 passes through the inside of the heat sink 18. The long bolt 19 passes through the inside of the locking shell 111 and is threaded, locking the heat sink 18 to the rear end of the housing 11. The fan 17 is located inside the heat sink 18. The long bolt 19 is also threaded to the inside of the upper mounting seat 21 provided on the mounting mechanism 2, locking the upper mounting seat 21 to the front end of the housing 11. It should be noted that the wave plate 112, heat sink 113, and inner plate 114 are all made of aluminum, which has a good heat dissipation effect. There are four sets of wave plates 112, heat sink 113, and inner plates 114, distributed on the four sides of the outer side of the housing 11. Each set has four wave plates 112, five heat sinks 113, and five inner plates 114. The distribution of the wave plates 112 increases the area for heat absorption, and the heat sink 113 quickly dissipates heat from the housing 11 through the airflow guided by the inner plates 114, thereby improving the heat dissipation efficiency inside the housing 11 and ensuring that the motor 1 maintains a stable operating temperature.

[0023] Please see Figure 6-8 The present invention relates to a low-noise three-phase asynchronous motor for cooling towers. The upper mounting base 21 has four first lifting lugs 211 evenly spaced in a ring along its edge. A lower mounting base 22 is also provided below the upper mounting base 21, and four second lifting lugs 221 are evenly spaced in a ring along its edge. Fixing bolts 23 penetrate the first and second lifting lugs 211 and 221, connecting the upper mounting base 21 and the lower mounting base 22. An output shaft 16 passes through the middle of the upper and lower mounting bases 21 and 22. Nuts 232 are threaded onto the lower end of each fixing bolt 23, locking the lower mounting base 22 to the top of the cooling tower through the cooperation of the fixing bolts 23 and nuts 232. A spring 231 is provided on the outside of the fixing bolt 23, and the spring 231 is connected between the upper mounting base 21 and the lower mounting base 22; a bellows 24 is also connected between the upper mounting base 21 and the lower mounting base 22, an upper insertion ring 241 provided at the upper end of the bellows 24 is embedded in the lower end of the upper mounting base 21, and a lower connecting ring 242 provided at the lower end of the bellows 24 is embedded in the upper end of the lower mounting base 22. The bellows 24 is located outside the bearing seat 25, and the output shaft 16 passes through the center of the lower connecting ring 242 with clearance fit; a rotating plate 212 is also installed on the lower end surface of the upper mounting base 21, and the rotating plate 212 supports the bottom edge of the upper insertion ring 241 embedded in the lower end of the upper mounting base 21. It should be noted that fixing bolts 23 are provided between the four first lifting lugs 211 and the four second lifting lugs 221, and locking nuts are provided at the lower end of the first lifting lugs 211 and the upper and lower ends of the second lifting lugs 221, so as to suspend and support the upper mounting base 21 and the lower mounting base 22. The springs 231 provided on the outside of the four bolts 23 weaken the resonance generated by the lower mounting base 22 installed on the top of the cooling tower, and reduce the vibration transmitted to the motor 1, thereby reducing the noise generated by the resonance of the motor 1 during operation. The bellows 24 is made of rubber, which has good elasticity. The bellows 24 has a structure that is wide at the top and narrow at the bottom. This not only improves the sealing of the connection between the output shaft 16 and the inside of the housing 11, preventing humid air from entering the housing 11 and affecting the operation of the motor 1, but also absorbs the vibration energy through the deformation of the bellows 24 itself when the lower mounting base 22 resonates, thereby reducing vibration transmission and weakening the transmission of vibration from the lower mounting base 22 to the upper mounting base 21, thus preventing the motor 1 from resonating and generating noise. Two rotating plates 212 are provided, and they rotate at the lower end of the upper mounting base 21. When the rotating plates 212 on both sides rotate to the inner side, they support the bottom edge of the upper insertion ring 241, preventing the upper end of the bellows 24 from falling out of the upper mounting base 21. The rotation of the rotating plates 212 to the outer side, as well as the separation of the upper mounting base 21 and the lower mounting base 22, facilitates the removal, cleaning, or replacement of the bellows 24.

[0024] This invention provides an improved low-noise three-phase asynchronous motor specifically for cooling towers, the working principle of which is as follows; First, when the motor 1 is installed on the top of the cooling tower, the lower mounting base 22 is locked and fixed to the top of the cooling tower by the cooperation of the fixing bolt 23 and the nut 232, and the lower mounting base 22 and the upper mounting base 21 are suspended by the fixing bolt 23. At this time, the motor 1 is fixed on the top of the cooling tower, and the fan at the top of the cooling tower is connected through the output shaft 16 of the motor 1. Second, when the motor 1 drives the fan at the top of the cooling tower, it connects to an external power source through the terminal 12 to provide power to the stator winding 14. At this time, a magnetic field is generated between the inner stator core 13 and the permanent magnet outer rotor 15. Through the cooperation of the permanent magnet pole 152 and the inner stator pole 132, the N / S pole of the permanent magnet pole 152 will try to align with the opposite polarity of the magnetic field of the inner stator pole 132 (opposite poles attract each other), so that the outer rotor yoke 151 is dragged to rotate by the magnetic field. Through the connection of the connecting rod 153, the output shaft 16 rotates to drive the fan at the top of the cooling tower. Third, during the rotation of the output shaft 16, the ventilation port 134 on the connecting cylinder 133 and the connecting plate 154 between the three sets of outer rotor yokes 151 create a large flow space between the inner stator core 13 and the permanent magnet outer rotor 15. At the same time, the output shaft 16 drives the rear fan 17 to rotate, dissipating heat from the heat sink 18. With the thermal conductivity of the wave plate 112, heat sink 113 and inner insert plate 114, the heat is quickly conducted outward, preventing heat from accumulating between the inner stator core 13 and the permanent magnet outer rotor 15.

[0025] The above description shows and illustrates the basic principles, main features, and advantages of the present invention. Standard parts used in the present invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0026] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low-noise three-phase asynchronous motor for cooling towers, comprising a motor (1) and a mounting mechanism (2), wherein the motor (1) is mounted on the upper end of the mounting mechanism (2); Its features are: The motor (1) includes a housing (11), terminals (12), an inner stator core (13), a stator winding (14), and a permanent magnet outer rotor (15). The housing (11) is provided with terminals (12) on its exterior, and the terminals (12) are electrically connected to the stator winding (14) wound on the inner stator core (13). The inner stator core (13) and the stator winding (14) are both located inside the permanent magnet outer rotor (15), which is installed on the inner edge of the housing (11). The inner stator core (13) is composed of a core (131), an inner stator magnetic pole (132), a connecting cylinder (133), a vent (134), and bolts (135). The inner stator magnetic pole (132) is connected to the outside of the core (131), and a stator winding (14) is wound on the core (131). There are three sets of cores (131), and a connecting cylinder (133) is provided between two cores (131). A vent (134) passes through the inside of the connecting cylinder (133). The three sets of cores (131) and the two connecting cylinders (133) are connected and fixed by three bolts (135). The three sets of cores (131) and the two connecting cylinders (133) are all located on the same axis.

2. The low-noise three-phase asynchronous motor for cooling towers according to claim 1, characterized in that: The permanent magnet outer rotor (15) is composed of an outer rotor yoke (151), a permanent magnet pole (152), a connecting rod (153), and a connecting plate (154). The outer rotor yoke (151) is installed on the inner edge of the housing (11). The inner wall of the outer rotor yoke (151) is provided with a permanent magnet pole (152). The front end of the outer rotor yoke (151) is welded to the outer end of the connecting rod (153), and the inner end of the connecting rod (153) is welded with an output shaft (16). The outer rotor yoke (151) and the permanent magnet pole (152) are both located outside the inner stator core (13) and the stator winding (14). The three sets of outer rotor yokes (151) are connected to each other by a connecting plate (154).

3. The low-noise three-phase asynchronous motor for cooling towers according to claim 2, characterized in that: The output shaft (16) is equipped with bearings (161) at both ends. The bearing (161) at the front end is installed inside the bearing seat (25) set on the mounting mechanism (2), and the bearing (161) at the rear end is set inside the housing (11) at the rear end.

4. The low-noise three-phase asynchronous motor for cooling towers according to claim 3, characterized in that: The inner wall of the housing (11) is embedded with a corrugated plate (112), and the corrugated plate (112) is connected to an inner insert plate (114) inserted and installed on the inner wall of the housing (11). The inner insert plate (114) is connected to a heat sink (113) welded to the outer surface of the housing (11). A fan (17) is also installed at the rear end of the housing (11), and the rear end of the output shaft (16) drives the fan (17) to rotate.

5. The low-noise three-phase asynchronous motor for cooling towers according to claim 4, characterized in that: The outer surface of the housing (11) is also provided with a locking shell (111) and is an integrated structure. A heat sink (18) is also installed at the rear end of the housing (11). A long bolt (19) passes through the inside of the heat sink (18). The long bolt (19) passes through the inside of the locking shell (111) and is threaded to lock the heat sink (18) to the rear end of the housing (11). The fan (17) is located inside the heat sink (18). The long bolt (19) is also threaded to the inside of the upper mounting seat (21) provided on the mounting mechanism (2) to lock the upper mounting seat (21) to the front end of the housing (11).

6. The low-noise three-phase asynchronous motor for cooling towers according to claim 5, characterized in that: The upper mounting base (21) has four first lifting lugs (211) arranged in a ring at equal intervals on its edge. A lower mounting base (22) is also provided below the upper mounting base (21), and four second lifting lugs (221) are arranged in a ring at equal intervals on its edge. Fixing bolts (23) pass through the first lifting lugs (211) and the second lifting lugs (221). The upper mounting base (21) and the lower mounting base (22) are connected by fixing bolts (23). The output shaft (16) passes through the middle of the upper mounting base (21) and the lower mounting base (22).

7. The low-noise three-phase asynchronous motor for cooling towers according to claim 6, characterized in that: The lower end of the fixing bolt (23) is also provided with a nut (232) and threaded connection. The lower mounting base (22) is locked and fixed to the top of the cooling tower by the cooperation of the fixing bolt (23) and the nut (232).

8. The low-noise three-phase asynchronous motor for cooling towers according to claim 7, characterized in that: A spring (231) is provided on the outside of the fixing bolt (23), and the spring (231) is connected between the upper mounting base (21) and the lower mounting base (22).

9. The low-noise three-phase asynchronous motor for cooling towers according to claim 8, characterized in that: A bellows (24) is also connected between the upper mounting base (21) and the lower mounting base (22). The upper insertion ring (241) provided at the upper end of the bellows (24) is embedded in the lower end of the upper mounting base (21), and the lower connecting ring (242) provided at the lower end of the bellows (24) is embedded in the upper end of the lower mounting base (22). The bellows (24) is located outside the bearing seat (25), and the output shaft (16) is passed through the center of the lower connecting ring (242) with clearance fit.

10. The low-noise three-phase asynchronous motor for cooling towers according to claim 9, characterized in that: A rotating plate (212) is also installed on the lower surface of the upper mounting base (21), and the rotating plate (212) supports the bottom edge of the upper insertion ring (241) embedded in the lower end of the upper mounting base (21).

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