Main shaft outer surface water cooling fan

Abstract

The utility model provides a main shaft outer surface water cooling fan, which is characterized in that a water cooling flow channel is processed in a motor shell, and a first water inlet and a first water outlet which are connected with two ends of the water cooling flow channel are arranged; an annular cavity is formed in the outer surface of the main shaft, and a second water inlet and a second water outlet are formed in the annular cavity, so that two water cooling flow channels are formed. Wherein the water cooling flow channel arranged in the motor shell is used for cooling the motor, and heat of the motor and heat conducted from the outside are taken away through water flow; an annular cavity arranged on the main shaft between the motor and the impeller is used for cooling the main shaft, water flows through the annular cavity to enable water flow to take away heat of the main shaft, and mechanical sealing is adopted between the annular cavity and the main shaft to prevent leakage. In a normal-temperature working condition, only the water-cooling flow channel in the motor shell can be opened for cooling; under the high-temperature working condition, two paths of water cooling can be started at the same time for cooling, and the efficient and reliable cooling effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of water-cooled fan of main shaft outer surface. BACKGROUND

[0002] In the fan structure, the heat conducted to the main shaft by the impeller will eventually affect the performance of the bearing. The existing cooling method usually sets cooling fins on the motor shell. For example, the Chinese utility model patent with the application number 202420158989.8 and the name of a motor shell with large heat dissipation area has an unsatisfactory heat dissipation effect. SUMMARY

[0003] The utility model aims to provide a kind of water-cooled fan of main shaft outer surface.

[0004] To solve the above problems, the utility model provides a kind of water-cooled fan of main shaft outer surface, which comprises:

[0005] The annular cavity is installed on the outer surface of the main shaft, and is provided with a spiral water cooling channel and a second water inlet and a second water outlet for circulating cooling water to cool the main shaft.

[0006] The motor shell of the motor is provided with a water cooling channel inside, and the outer surface of the motor shell is provided with a first water inlet and a first water outlet, respectively. The first water inlet is in communication with the water inlet end of the water cooling channel, and the first water outlet is in communication with the water outlet end of the water cooling channel.

[0007] The main shaft is arranged in the bearing on the motor, and one end of the main shaft is connected to the impeller. The annular cavity is installed on the outer surface of the main shaft between the motor and the impeller.

[0008] Further, in the above-mentioned water-cooled fan of main shaft outer surface, the water cooling channel is spiral.

[0009] Further, in the above-mentioned water-cooled fan of main shaft outer surface, it further comprises: a junction box connected to the motor, the junction box is connected to the motor shell, the wires in the junction box pass through the motor shell and are connected to the motor in the motor shell, and the junction box and the wires are isolated from the water cooling channel, respectively.

[0010] Further, in the above-mentioned water-cooled fan of main shaft outer surface, the main shaft between the motor and the impeller is sealed and connected to the annular cavity through a mechanical sealing structure.

[0011] Further, in the above-mentioned water-cooled fan of main shaft outer surface, the annular cavity is provided with spiral vanes at intervals.

[0012] Further, in the above-mentioned spindle outer surface water-cooled fan, the annular cavity comprises: an upper half and a lower half, wherein the lower part of the upper half is provided with a lower flange, and the upper part of the lower half is provided with an upper flange matched with the lower flange to form a seal.

[0013] Further, in the above-mentioned spindle outer surface water-cooled fan, the sealing connection part of the upper flange and the lower flange is further provided with a sealing gasket.

[0014] Further, in the above-mentioned spindle outer surface water-cooled fan, the mechanical seal structure comprises: a spring, two dynamic rings and two static rings, wherein,

[0015] The first dynamic ring and the first static ring are sleeved on the spindle near the upper part of the upper half of the annular cavity, and the second dynamic ring and the second static ring are sleeved on the spindle near the lower part of the lower half of the annular cavity; the first dynamic ring and the second dynamic ring each comprise: an upper and lower integrated large ring part and a small ring part, the inner diameters of the large ring part and the small ring part are the same, and the ring width of the large ring part is greater than that of the small ring part, so as to form a ring of bosses on the outer edge of the large ring part protruding the outer edge of the small ring part;

[0016] The inner rings of the two ends of the spring are respectively sleeved on the outer surfaces of the small ring parts of the first dynamic ring and the second dynamic ring, so that the inner sides of the small ring parts are tightly attached to the spindle to prevent water leakage; the top and bottom of the spring are respectively limited on the bosses of the large ring parts of the first dynamic ring or the second dynamic ring, the top surface of the large ring part of the first dynamic ring is in contact with the bottom surface of the first static ring; the bottom surface of the large ring part of the second dynamic ring is in contact with the top surface of the second static ring;

[0017] After the upper flange and the lower flange are matched and installed, the first static ring is tightly matched with the upper half of the annular cavity, and the upper half of the annular cavity presses the upper surface of the first static ring; the second static ring is tightly matched with the lower half of the annular cavity, and the lower half of the annular cavity presses the lower surface of the second static ring;

[0018] The inner sides of the static rings and the large ring parts and the spindle are respectively left with gaps.

[0019] Further, in the above-mentioned spindle outer surface water-cooled fan, a cylindrical cover shell is further included, the motor, the spindle and the impeller are arranged in the cover shell, the top and bottom of the cover shell are open, and the outer side wall of the cover shell is further provided with a mounting flange.

[0020] Further, in the above-mentioned spindle outer surface water-cooled fan, high-temperature cotton is further wrapped around the motor shell and the annular cavity, and a polytetrafluoroethylene heat insulation plate is further arranged around the junction box.

[0021] Compared with the prior art, the utility model discloses a water cooling flow channel is processed in the motor shell inside, and sets up the first inlet and first outlet of water of connecting two ends of water cooling flow channel, installs a annular cavity on the main shaft outer surface, and sets up the second inlet and second outlet of water on annular cavity, forms 2 road water cooling flow channel, wherein, the water cooling flow channel for being arranged in the motor shell is used to cool the motor, and the heat of motor and the heat of external conduction are taken away through the water flow, the annular cavity for being arranged on the main shaft between the motor and the impeller is used to cool the main shaft, and the annular cavity is watered and lets the water flow take away the main shaft heat, and the mechanical seal between annular cavity and main shaft is used to prevent the leakage. When normal temperature working condition, can only open the water cooling flow channel in the motor shell and carry out the cooling, when high temperature working condition, can open two road water cooling simultaneously and carry out the cooling, reaches the effect of high -efficient reliable cooling. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the internal assembly cross section schematic diagram of the main shaft outer surface water -cooled fan of an embodiment of the utility model;

[0023] Figure 2 It is the cross section schematic diagram of the main shaft cooling flow channel of an embodiment of the utility model;

[0024] Figure 3 It is the cross section schematic diagram of the motor cooling flow channel of an embodiment of the utility model;

[0025] Figure 4 It is the side view of the shell of the main shaft outer surface water -cooled fan of an embodiment of the utility model;

[0026] Figure 5 It is the top view of the shell of the main shaft outer surface water -cooled fan of an embodiment of the utility model;

[0027] Figure 6 It is the cross section schematic diagram of the motor cover shell heat insulation structure of an embodiment of the utility model

[0028] Figure 7 It is the top view of the motor cover shell heat insulation structure of an embodiment of the utility model. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the utility model is further explained in detail below by combining with the drawings and specific embodiment.

[0030] As Figure 1 Indicated, the utility model provides a main shaft outer surface water -cooled fan, including: annular cavity 8, motor 1, main shaft 2 and impeller 3, wherein,

[0031] The motor shell 4 of the motor 1 is internally provided with a water cooling flow channel 5, and the outer surface of the motor shell 4 is respectively provided with a first water inlet 6 and a first water outlet 7, the first water inlet 6 is communicated with the water inlet end of the water cooling flow channel 5, and the first water outlet 7 is communicated with the water outlet end of the water cooling flow channel 5.

[0032] The main shaft 2 is arranged in bearings 9 and 10 on the motor 1, and one end of the main shaft 1 is connected to the impeller 3; an annular cavity 8 is arranged on the outer surface of the main shaft between the motor 1 and the impeller 3, and the annular cavity 8 is provided with a second water inlet 11 and a second water outlet 12.

[0033] In this embodiment, the water cooling flow channel is processed in the form of a spiral line in the motor shell, and the first water inlet and the second water outlet are arranged at the two ends of the water cooling flow channel, and the interface specification can be M24.

[0034] The shaft surface water cooling fan of the utility model is provided with two water cooling flow channels, wherein the water cooling flow channel arranged in the motor shell is used for cooling the motor, and the heat of the motor itself and the heat conducted from the outside are taken away by the water flow; the annular cavity arranged on the main shaft between the motor and the impeller is used for cooling the main shaft, the water flow in the annular cavity takes away the heat of the main shaft, and mechanical sealing is adopted between the annular cavity and the main shaft to prevent leakage. The water consumption of the motor cooling water channel is 4m 3 / h, and the water consumption of the main shaft cooling water channel is 2m 3 / h. In the normal temperature condition, only the water cooling flow channel in the motor shell can be started to cool; in the high temperature condition, two water cooling channels need to be started to cool, so that the effect of efficient and reliable cooling is achieved.

[0035] Specifically, the power interface of the shaft surface water cooling fan can be three-phase AC 380V, 50Hz, or two-phase AC 220V, 50Hz.

[0036] The cooling water demand of the shaft surface water cooling fan can be, for example, temperature: ≤25℃, water consumption 4m 3 / h in the normal temperature condition; and water consumption 6m 3 / h in the high temperature condition. The water pipe interface specification can be M18 or M24.

[0037] In an embodiment of the shaft surface water cooling fan, the water cooling flow channel 5 is in the form of a spiral.

[0038] In this embodiment, the water cooling flow channel is processed in the form of a spiral line in the motor shell, and the first water inlet and the second water outlet are arranged at the two ends of the water cooling flow channel, and the interface specification can be M24. The heat of the motor itself and the heat conducted from the outside to the shell are taken away by the cooling water in the water cooling flow channel. The cooling water in the water cooling flow channel can be fresh water, and the flow rate can be 4m3 / h, the temperature is not more than 25℃.

[0039] The spiral-shaped water cooling flow channel can make the cooling liquid flow along a specific spiral path inside the motor shell, and has a larger and more uniform contact area with the heat generating components of the motor. Compared with the linear flow channel, it can more comprehensively cover the areas inside the motor that need to be cooled, avoiding local overheating, thereby improving the overall cooling effect and ensuring the temperature balance of each part of the motor. The spiral shape can guide the cooling water to form a certain rotational flow, increasing the convective heat transfer intensity between the cooling water and the wall surface of the water cooling flow channel. This rotational flow can break the boundary layer, allowing heat to be more effectively transferred from the wall surface of the water cooling flow channel to the cooling liquid, carrying away more heat and improving the cooling efficiency. In addition, the spiral line-shaped flow channel can realize a longer flow channel length in a relatively small space. For such devices as motors with limited internal space, it can provide sufficient cooling paths without significantly increasing the volume of the shell, effectively utilizing the space inside the motor shell and making the structure of the motor more compact. The radius, pitch and other parameters of the spiral can be flexibly designed according to the internal structure and heat generating characteristics of the motor, to adapt to motors of different shapes and sizes and better meet the cooling needs of the motor, achieving the best cooling effect in a limited space. In addition, the curvature of the spiral line-shaped flow channel is relatively gentle, and the change of flow direction is relatively smooth when the cooling liquid flows in it, unlike some right-angled bends or complex-shaped flow channels that are prone to vortex and turbulence, thereby reducing flow resistance and pressure loss. Since the pressure loss is small, the cooling liquid can flow in the spiral line-shaped flow channel with a relatively stable flow rate, ensuring the stability of the cooling effect. This helps to maintain the cooling performance of the motor under different operating conditions, enabling it to operate reliably. Moreover, the spiral line-shaped flow channel makes the flow of cooling liquid more stable, reducing noise caused by fluid impact and vibration. Compared with other shapes of flow channels, the cooling water flows in the spiral-shaped flow channel in a more orderly manner, without sudden impact and vibration, thereby reducing the noise level during operation and improving the running comfort of the motor. Furthermore, the spiral-shaped flow channel enhances the structural strength of the motor shell to some extent, reducing deformation and vibration of the shell due to thermal expansion and contraction, which in turn helps to reduce noise.

[0040] The utility model discloses an outer surface water -cooling fan of shaft still includes: the junction box 13 of connection motor, junction box 13 with the motor shell 4 is connected, the wire in junction box 13 passes through the motor shell 4 with the motor 1 in the motor shell 4 is connected, junction box 13 and wire are isolated with water cooling flow channel 5 respectively.

[0041] Here, wires or cables pass through pre-drilled holes in the motor housing, connecting the electrical connection points inside the junction box to the electrical components inside the motor, such as the windings. The junction box and wires or cables must be isolated from the cooling water flow channels to prevent electrical short circuits and ensure that the electrical components are in a dry, safe environment.

[0042] In one embodiment of the external surface water-cooled fan of this utility model, a mechanical seal structure is provided between the annular cavity 8 between the motor 1 and the impeller 3 and the main shaft 2 to achieve a sealed connection.

[0043] Here, a mechanical seal structure is a shaft sealing device for rotating machinery that prevents water from leaking from the gap between the main shaft and the annular cavity.

[0044] like Figure 3 As shown, in one embodiment of the external surface water-cooled fan of this utility model, the annular cavity 8 includes an upper half 81 and a lower half 82, wherein a lower flange 83 is provided at the lower part of the upper half 81, and an upper flange 84 is provided at the upper part of the lower half 82 to cooperate with the lower flange 83 to form a seal.

[0045] Here, the heat conducted from the impeller to the main shaft ultimately affects the bearing performance. Therefore, a water-cooling device is required to cool the main shaft, located between the impeller and the motor. The main shaft water-cooling device is an annular cavity surrounding the outer surface of the main shaft, with a second inlet 11 and a second outlet 12. Figure 3 As shown, the second inlet 11 can be located in the upper half 81, and the second outlet 12 can be located in the lower half 82. The interface specification can be M18. The upper and lower halves of the annular cavity are connected to form a closed hollow annular cavity.

[0046] like Figure 3 As shown, in one embodiment of the external surface water-cooled fan of this utility model, a sealing gasket 85 is also provided at the sealing connection between the upper flange 84 and the lower flange 83 to improve the sealing effect.

[0047] In one embodiment of the water-cooled fan with the outer surface of the shaft of this utility model, the mechanical seal structure includes: a spring 19, two rotating rings, and two stationary rings 17, wherein...

[0048] The first moving ring and the first stationary ring are fitted on the main shaft 2 near the upper part 81 of the annular cavity 8, and the second moving ring and the second stationary ring are fitted on the main shaft 2 near the lower part 82 of the annular cavity 8. The first moving ring and the second moving ring each include a large ring 181 and a small ring 182 connected as one piece. The inner diameters of the large ring 181 and the small ring 182 are the same. The ring width of the large ring 181 is greater than the ring width of the small ring 181, so that the outer edge of the large ring 181 protrudes from the outer edge of the small ring to form a boss 183.

[0049] The inner ring of the spring 19 is respectively sleeved on the outer surface of the small ring part 182 of the first movable ring and the small ring part 182 of the second movable ring, so that the inner side of the small ring part 182 is tightly attached to the main shaft 2 to prevent water leakage; the top and bottom of the spring 19 are respectively limited on the boss of the large ring part of the first movable ring or the second movable ring, the top surface of the large ring part 181 of the first movable ring is in contact with the bottom surface of the first static ring 17, and the bottom surface of the large ring part 181 of the second movable ring is in contact with the top surface of the second static ring 17.

[0050] After the upper flange 83 and the lower flange 84 are cooperatively installed, the first static ring 17 is tightly cooperated with the upper half 81 of the annular cavity 8, the upper half 81 of the annular cavity 8 presses the upper surface of the first static ring 18, and the second static ring 17 is tightly cooperated with the lower half 82 of the annular cavity 8, the lower half 82 of the annular cavity 8 presses the lower surface of the second static ring 17.

[0051] The inner side of the static ring 17 and the large ring part 181 is respectively left with a gap 20 between the main shaft 2.

[0052] Here, when the main shaft 2 rotates, the annular cavity 8 is static, the static ring is installed on the annular cavity and is static, the movable ring 17 and the spring 19 rotate with the main shaft 2, and the movable ring 17 can rotate with the main shaft 2.

[0053] The main shaft cooling water path is arranged on the outer surface of the main shaft 3 between the motor 1 and the impeller 3, an annular cavity 8 is arranged on the outer surface of the main shaft 2, the annular cavity 8 is water-penetrated to let the water flow take away the heat of the main shaft. The annular cavity 8 and the main shaft 2 adopt a mechanical sealing structure to prevent leakage.

[0054] A structure protrusion, boss or groove can be arranged on the top surface or the bottom surface of the small ring part of the movable ring, which is limited in design, plays an axial positioning role on the spring, prevents the spring from being taken out in the axial direction, and realizes the close attachment of the large ring part and the static ring.

[0055] The inner ring of the spring 19 is sleeved on the outer surface of the small ring part 181, and after the upper flange 83 and the lower flange 84 are cooperatively installed to combine the upper half 81 and the lower half 82 of the annular cavity 8, the spring 19 applies an axial force to the boss 183 of the large ring part 181 of the movable ring through the elastic force of the spring, under the action of the force, the movable ring is pressed towards the static ring 17, so that the movable ring and the static ring are in close surface contact, a sealing surface is formed to prevent fluid leakage, the large ring part of the movable ring is closely attached to the static ring to achieve the sealing effect. The bottom surface or the top surface of the large ring part of the movable ring can be in close surface contact with the static ring by relying on the elastic force of the spring.

[0056] The inner diameter of the spring 19 and the outer diameter of the small ring part of the movable ring can be accurately designed and processed, so that the inner diameter of the spring is slightly smaller than the outer diameter of the small ring part of the movable ring, a certain friction force is generated through interference fit, so as to prevent the spring from falling out, so that the inner side of the small ring part is tightly attached to the main shaft and sealed.

[0057] As Figure 3 shown, in an embodiment of the shaft outer surface water-cooled air cooler, the annular cavity 8 is provided with spiral vanes 16 in the chamber.

[0058] Here, the annular cavity is provided with spiral vanes for guiding the flow of cooling water, so that the cooling water can fully exchange heat in the annular cavity and finally take away the heat of the main shaft. The flow of cooling water in the annular cavity can be 2m3 / h, and the temperature is not more than 25℃.

[0059] The spiral vanes in the chamber of the annular cavity can be arranged in equal intervals, variable intervals, different spiral angles, staggered arrangement and segmented arrangement according to actual refrigeration needs.

[0060] Among them, equal interval uniform layout: spiral piece is distributed in equal interval along the axial direction of annular cavity. This layout can make the cooling liquid receive relatively uniform disturbance in the flow process, which helps to improve the heat exchange efficiency of the cooling liquid and the cavity wall and the main shaft, and ensures the uniformity of cooling effect. At the same time, uniform layout is convenient for processing and manufacturing, which reduces the production difficulty and cost. For example, in some motor cooling systems with high cooling uniformity requirements, this layout is used, and a spiral piece is arranged every certain distance (such as 20-50mm).

[0061] Variable interval layout: according to the heat dissipation needs of different positions of the annular cavity, the interval of the spiral piece can be changed. In the area where the heat is concentrated, the interval of the spiral piece is reduced, the disturbance degree of the cooling liquid is increased, and the heat dissipation capacity of the area is improved; while in the area where the heat is relatively low, the interval of the spiral piece is appropriately increased to reduce the flow resistance and ensure the flow of the cooling liquid. For example, the interval of the spiral piece near the motor winding and other parts with large heat quantity can be set to 10-20mm, while the interval of the spiral piece in other parts can be increased to 30-60mm.

[0062] Different spiral angle layout: the spiral angle of the spiral piece can be different. By changing the spiral angle, the flow direction and speed distribution of the cooling liquid can be adjusted to adapt to different cooling needs. For example, in the area close to the water inlet, a smaller spiral angle is adopted, so that the cooling liquid can enter the cavity smoothly and start to flow; while in the latter half of the cavity, the spiral angle is gradually increased, the rotation intensity of the cooling liquid is increased, and the heat exchange effect is improved. This layout needs accurate design and calculation to ensure the flow performance of the cooling liquid and the cooling effect.

[0063] Interleaved layout: adjacent spiral fins are arranged in an interleaved manner in the axial and circumferential directions. This layout can further enhance the disturbance effect of the cooling liquid, break the laminar flow state of the cooling liquid, and promote the formation of turbulent flow, thereby significantly improving the heat exchange efficiency. The interleaved layout can also make the flow of the cooling liquid in the annular cavity more uniform, reducing the occurrence of local hot spots. However, the processing difficulty of this layout is relatively large, requiring higher manufacturing precision.

[0064] Segmented layout: the annular cavity is divided into several segments, and different spiral fin layout methods are used in different segments. For example, an equal-interval layout is used in the front segment of the cavity to ensure smooth introduction of the cooling liquid; a variable-interval or interleaved layout is used in the middle segment to enhance the cooling effect; and a larger-interval layout is used in the rear segment to reduce flow resistance and allow the cooling liquid to flow out smoothly. This segmented layout can consider the cooling requirements and flow characteristics at different stages to achieve optimal cooling performance.

[0065] As shown in Figure 4 and 5 , the shaft outer surface water-cooled fan one embodiment of the utility model further includes the casing 15 of cylinder, motor 1, main shaft 2 and impeller 2 are arranged in casing 15, the top and bottom of casing are open, the outer side wall of casing still is provided with mounting flange 14.

[0066] Here, in order to make motor and main shaft not with high temperature airflow direct contact, set up a casing and completely cover motor therein.

[0067] As shown in Figure 6 and 7 , the shaft outer surface water-cooled fan one embodiment of the utility model, motor housing 4 and annular cavity 8 outside are covered with high temperature cotton 21 respectively, the periphery of terminal box 4 still is provided with polytetrafluoroethylene heat insulation plate 22.

[0068] Here, in order to reduce the heat conduction from the casing to the motor, the casing is attached with high temperature cotton, polytetrafluoroethylene and other materials to achieve heat insulation. The high temperature cotton can be ceramic fiber high temperature cotton, glass fiber high temperature cotton or rock wool high temperature cotton, etc.

[0069] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between each embodiment can be referred to each other.

[0070] Obviously, those skilled in the art can make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and their equivalents, the utility model also intends to include these modifications and variations.

Claims

1. A water-cooled fan for the outer surface of a spindle, characterized in that, The components include an annular cavity, a motor, a main shaft, and an impeller. The annular cavity is installed on the outer surface of the spindle, and has a spiral water-cooling channel inside. It is also equipped with a second water inlet and a second water outlet for circulating cooling water to cool the spindle. The motor housing has a water-cooling channel inside, and the outer surface of the motor housing has a first water inlet and a first water outlet. The first water inlet is connected to the water inlet end of the water-cooling channel, and the first water outlet is connected to the water outlet end of the water-cooling channel. The main shaft passes through the bearing on the motor, and one end of the main shaft is connected to the impeller; the annular cavity is installed on the outer surface of the main shaft between the motor and the impeller.

2. The water-cooled fan on the outer surface of the spindle as described in claim 1, characterized in that, The water-cooling channel is spiral-shaped.

3. The water-cooled fan on the outer surface of the spindle as described in claim 1, characterized in that, Also includes: A junction box for connecting the motor is provided. The junction box is connected to the motor housing. The wires inside the junction box pass through the motor housing and are connected to the motor inside the motor housing. The junction box and the wires are respectively isolated from the water-cooling channel.

4. The water-cooled fan on the outer surface of the spindle as described in claim 1, characterized in that, The main shaft between the motor and the impeller is sealed and connected to the annular cavity by a mechanical seal structure.

5. The water-cooled fan on the outer surface of the spindle as described in claim 4, characterized in that, The annular cavity is provided with helical blades at intervals.

6. The water-cooled fan on the outer surface of the spindle as described in claim 4, characterized in that, The annular cavity includes an upper part and a lower part, wherein the lower part of the upper part is provided with a lower flange, and the upper part of the lower part is provided with an upper flange that cooperates with the lower flange to form a seal.

7. The water-cooled fan on the outer surface of the spindle as described in claim 6, characterized in that, A sealing gasket is also provided at the sealing connection between the upper flange and the lower flange.

8. The water-cooled fan on the outer surface of the spindle as described in claim 6, characterized in that, The mechanical seal structure includes: a spring, two rotating rings, and two stationary rings, wherein, The first moving ring and the first stationary ring are fitted on the upper part of the main shaft near the upper half of the annular cavity, and the second moving ring and the second stationary ring are fitted on the lower part of the main shaft near the lower half of the annular cavity. The first moving ring and the second moving ring each include a large ring part and a small ring part that are connected as one piece. The inner diameter of the large ring part and the small ring part are the same. The ring width of the large ring part is greater than the ring width of the small ring part, so that the outer edge of the large ring part protrudes from the outer edge of the small ring part to form a boss. The inner rings at both ends of the spring are respectively fitted onto the outer surfaces of the small ring portion of the first moving ring and the small ring portion of the second moving ring, so that the inner side of the small ring portion is tightly fitted and sealed with the main shaft to prevent water leakage; the top and bottom of the spring are respectively limited on the protrusions of the large ring portion of the first moving ring or the second moving ring, the top surface of the large ring portion of the first moving ring contacts the bottom surface of the first stationary ring; the bottom surface of the large ring portion of the second moving ring contacts the top surface of the second stationary ring. After the upper and lower flanges are installed together, the first stationary ring fits tightly with the upper half of the annular cavity, and the upper half of the annular cavity presses against the upper surface of the first stationary ring; the second stationary ring fits tightly with the lower half of the annular cavity, and the lower half of the annular cavity presses against the lower surface of the second stationary ring.

9. The water-cooled fan on the outer surface of the spindle as described in claim 1, characterized in that, It also includes a cylindrical housing, in which the motor, main shaft and impeller are disposed, and the top and bottom of the housing are open, and the outer side wall of the housing is also provided with a mounting flange.

10. The water-cooled fan on the outer surface of the spindle as described in claim 3, characterized in that, The motor housing and the annular cavity are also covered with high-temperature cotton, and a polytetrafluoroethylene heat insulation board is provided around the junction box.

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