Main shaft inner hole water-cooling high-temperature-resistant fan

Abstract

The utility model provides a water-cooling high-temperature-resistant fan for an inner hole of a main shaft, 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 in the motor shell; the spindle cooling water channel is arranged on the spindle center hole, and cooling water axially flows into the cooling water flow channel of the spindle inner hole from the water inlet annular cavity at the top end of the spindle and then radially flows out from the water outlet annular cavity. The water inlet annular cavity is provided with a second water inlet, the water outlet annular cavity is provided with a second water outlet, and mechanical sealing is adopted between the water inlet annular cavity and the main shaft and between the water outlet annular cavity and the main shaft to prevent leakage. According to the utility model, two water cooling runners are arranged, so that efficient and reliable cooling can be realized.

Description

Technical Field

[0001] This utility model relates to a water-cooled high-temperature resistant fan with a main shaft inner hole. Background Technology

[0002] In the structure of a fan, the heat conducted from the impeller to the main shaft will eventually affect the performance of the bearing. Existing cooling methods usually involve setting heat sinks on the motor housing. For example, the Chinese utility model patent with application number 202420158989.8 entitled "A Motor Housing with Large Heat Dissipation Area" has an unsatisfactory heat dissipation effect. Utility Model Content

[0003] The purpose of this invention is to provide a water-cooled high-temperature resistant fan with a main shaft inner hole.

[0004] To solve the above problems, this utility model provides a water-cooled high-temperature resistant fan with an inner shaft, comprising: an inlet annular cavity, an outlet annular cavity, a motor, a main shaft, and an impeller, wherein...

[0005] 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.

[0006] The main shaft passes through the bearing on the motor, and one end of the main shaft is connected to the impeller; the main shaft is provided with an axial cooling water channel and a radial channel, and the outlet end of the axial cooling water channel is connected to the inlet end of the radial channel.

[0007] A water inlet annular cavity is fitted on the outer surface of the main shaft before it passes through the motor. A second water inlet is provided on the water inlet annular cavity. The water inlet end of the cooling water flow channel is connected to the water inlet annular cavity.

[0008] A water outlet annular cavity is fitted on the outer surface of the main shaft between the motor and the impeller. A second water outlet is provided on the water outlet annular cavity. The water outlet end of the radial flow channel is connected to the water outlet annular cavity.

[0009] Furthermore, in the aforementioned water-cooled high-temperature resistant fan with the inner bore of the main shaft, the water-cooling flow channel is spiral-shaped.

[0010] Furthermore, the above-mentioned water-cooled high-temperature resistant fan with the inner bore of the main shaft also includes: a junction box for connecting the motor, the junction box being connected to the motor housing, the wires inside the junction box passing through the motor housing and connecting to the motor inside the motor housing, and the junction box and the wires being isolated from the water-cooling flow channel respectively.

[0011] Furthermore, in the aforementioned water-cooled high-temperature resistant fan with an inner bore of the main shaft, the water inlet annular cavity is connected to the main shaft before it enters the motor via a first mechanical seal structure; the water outlet annular cavity is connected to the main shaft between the motor and the impeller via a second mechanical seal structure.

[0012] Furthermore, in the aforementioned water-cooled high-temperature resistant fan with the main shaft inner bore, the water inlet annular cavity includes an upper water inlet section and a lower water inlet section, wherein the lower part of the upper water inlet section is provided with a lower water inlet flange, and the upper part of the lower water inlet section is provided with an upper water inlet flange that cooperates with the lower water inlet flange to form a seal.

[0013] Furthermore, in the aforementioned water-cooled high-temperature resistant fan with the main shaft inner bore, the water inlet annular cavity includes: a first spring, a first moving ring, a thrust ring, and a first stationary ring, wherein,

[0014] The first moving ring and the first stationary ring are fitted on the main shaft near the lower part of the lower half of the water inlet annular cavity; the first moving ring includes a first large ring and a first small ring connected as one piece, the inner diameters of the first large ring and the first small ring are the same, the ring width of the first large ring is greater than the ring width of the first small ring, so that the outer edge of the first large ring protrudes from the outer edge of the first small ring to form a first boss.

[0015] The inner ring of one end of the first spring is fitted onto the outer surface of the first small ring of the first moving ring so that the inner side of the first small ring is tightly fitted and sealed with the main shaft to prevent water leakage; the thrust ring is fixed on the main shaft, and the top and bottom of the first spring are respectively limited between the first boss and the thrust ring; the bottom surface of the first large ring of the first moving ring is in contact with the top surface of the first stationary ring.

[0016] After the upper and lower inlet flanges are installed together, the first stationary ring fits tightly with the lower half of the inlet annular cavity, and the lower half of the inlet annular cavity presses against the lower surface of the first stationary ring.

[0017] Furthermore, in the aforementioned water-cooled high-temperature resistant fan with the main shaft inner bore, the water outlet annular cavity includes an upper water outlet portion and a lower water outlet portion, wherein the lower part of the upper water outlet portion is provided with a lower water outlet flange, and the upper part of the lower water outlet portion is provided with an upper water outlet flange that cooperates with the lower water outlet flange to form a seal.

[0018] Furthermore, in the aforementioned water-cooled high-temperature resistant fan with the main shaft inner bore, the second mechanical seal structure includes: a second spring, two second rotating rings, and two second stationary rings, wherein,

[0019] The first second moving ring and the first second stationary ring are fitted on the upper part of the water outlet annular cavity near the main shaft, and the second second moving ring and the second second stationary ring are fitted on the lower part of the water outlet annular cavity near the main shaft. The first second moving ring and the second second moving ring each include: a second large ring part and a second small ring part connected vertically as one piece. The inner diameters of the second large ring part and the second small ring part are the same. The ring width of the second large ring part is greater than the ring width of the second small ring part, so that the outer edge of the second large ring part protrudes from the outer edge of the second small ring part to form a second boss.

[0020] The inner rings at both ends of the second spring are respectively fitted onto the outer sides of the second small ring portion of the first second moving ring and the second small ring portion of the second second moving ring, so that the inner side of the second small ring portion is tightly fitted and sealed with the main shaft to prevent water leakage; the top and bottom of the second spring are respectively limited to the second protrusion of the large ring portion of the first second moving ring or the second second moving ring, the top surface of the second large ring portion of the first second moving ring is in contact with the bottom surface of the first second stationary ring; the bottom surface of the large ring portion of the second second moving ring is in contact with the top surface of the second second stationary ring;

[0021] After the upper and lower outlet flanges are installed together, the first second stationary ring fits tightly with the upper part of the outlet annular cavity, and the upper part of the outlet annular cavity presses against the upper surface of the first second stationary ring; the second second stationary ring fits tightly with the lower part of the outlet annular cavity, and the lower part of the outlet annular cavity presses against the lower surface of the second second stationary ring.

[0022] Furthermore, the aforementioned water-cooled high-temperature resistant fan with an inner shaft bore also includes a cylindrical casing, in which the motor, main shaft, and impeller are disposed. The top and bottom of the casing are open, and the outer side wall of the casing is also provided with a mounting flange.

[0023] Furthermore, in the aforementioned water-cooled high-temperature resistant fan with the inner hole of the main shaft, the motor housing is also covered with high-temperature cotton, and a polytetrafluoroethylene heat insulation board is also provided around the junction box.

[0024] Compared with the prior art, this utility model processes a water-cooling channel inside the motor housing and sets a first inlet and a first outlet connecting the two ends of the water-cooling channel; the spindle cooling water channel is set on the central hole of the spindle, and the cooling water flows axially into the cooling water channel inside the spindle from the inlet annular cavity at the top of the spindle, and then flows radially out through the outlet annular cavity. A second inlet is provided on the inlet annular cavity, and a second outlet is provided on the outlet annular cavity. Both the inlet annular cavity and the outlet annular cavity are equipped with mechanical seals to prevent leakage between them and the spindle.

[0025] This utility model's shaft-internal water-cooled high-temperature resistant fan is equipped with two water-cooling channels. The water-cooling channel located inside the motor housing is used to cool the motor, carrying away the motor's own heat and heat conducted from the outside through water flow. The main shaft inner hole serves as the cooling water channel. Cooling water enters the inlet annular cavity through the second inlet of the inlet annular cavity. The cooling water in the inlet annular cavity then enters the cooling water channel inside the main shaft through the inlet end of the cooling water channel. It then flows out through the outlet end of the cooling water channel, the radial channel at the bottom of the main shaft, and finally out through the outlet annular cavity, and then out through the second outlet of the outlet annular cavity. This design achieves efficient and reliable cooling. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the internal assembly cross-section of a shaft-mounted water-cooled high-temperature resistant fan according to an embodiment of the present invention;

[0027] Figure 2 This is a cross-sectional schematic diagram of the spindle cooling channel according to an embodiment of the present invention;

[0028] Figure 3 This is a cross-sectional schematic diagram of a motor cooling channel according to an embodiment of the present invention;

[0029] Figure 4 This is a cross-sectional schematic diagram of the water inlet annular cavity according to an embodiment of the present invention;

[0030] Figure 5 This is a cross-sectional schematic diagram of the water outlet annular cavity according to an embodiment of the present invention;

[0031] Figure 6 This is a side view of the housing of a water-cooled high-temperature resistant fan with an inner shaft hole according to an embodiment of the present invention;

[0032] Figure 7 This is a top view of the housing of a water-cooled high-temperature resistant fan with an inner shaft hole according to an embodiment of the present invention. Detailed Implementation

[0033] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1 to 3 As shown, this utility model provides a water-cooled high-temperature resistant fan with an inner shaft, comprising: an inlet annular cavity 16, an outlet annular cavity 8, a motor 1, a main shaft 2, and an impeller 3, wherein...

[0035] The motor housing 4 of the motor 1 is provided with a water cooling channel 5 inside. The outer surface of the motor housing 4 is provided with a first water inlet 6 and a first water outlet 7. The first water inlet 6 is connected to the water inlet end of the water cooling channel 5, and the first water outlet 7 is connected to the water outlet end of the water cooling channel 5.

[0036] The main shaft 2 is installed inside the bearings 9 and 10 on the motor 1, and one end of the main shaft 1 is connected to the impeller 3; the main shaft 2 is provided with an axial cooling water channel 31 and a radial channel 32, and the outlet end of the axial cooling water channel 31 is connected to the inlet end of the radial channel 32.

[0037] A water inlet annular cavity 16 is fitted on the outer surface of the main shaft 2 before it passes through the motor 1. A second water inlet 11 is provided on the water inlet annular cavity 16. The water inlet end of the cooling water channel 31 is connected to the water inlet annular cavity 16.

[0038] A water outlet annular cavity 8 is fitted on the outer surface of the main shaft 2 between the motor 1 and the impeller 3. A second water outlet 12 is provided on the water outlet annular cavity 8. The water outlet end of the radial flow channel 32 is connected to the water outlet annular cavity 8.

[0039] In this invention, a water-cooling channel is machined inside the motor housing, and a first inlet and a first outlet are provided connecting the two ends of the water-cooling channel. The spindle cooling water circuit is located on the central hole of the spindle. Cooling water flows axially into the cooling water channel inside the spindle's inner hole from the inlet annular cavity at the top of the spindle, and then flows radially out through the outlet annular cavity. A second inlet is provided on the inlet annular cavity, and a second outlet is provided on the outlet annular cavity. Both the inlet and outlet annular cavities are connected to the spindle using mechanical seals to prevent leakage.

[0040] This utility model's spindle inner bore water-cooled high-temperature resistant fan is equipped with two water-cooling channels. The water-cooling channel located inside the motor housing is used to cool the motor, carrying away the motor's own heat and heat conducted from the outside through water flow. The spindle inner bore (center opening) serves as the cooling water channel. Cooling water enters the inlet annular cavity through the second inlet of the inlet annular cavity. The cooling water in the inlet annular cavity then enters the cooling water channel inside the spindle through the inlet end of the cooling water channel. It then flows out through the outlet end of the cooling water channel, the radial channel at the bottom of the spindle, and finally out through the outlet annular cavity, and then out through the second outlet of the outlet annular cavity. This design achieves efficient and reliable cooling.

[0041] Both the second inlet and the second outlet are equipped with mechanical seals. Cooling water requirements: fresh water, flow rate 2 m³ / h, temperature not exceeding 25℃. The motor cooling water circuit requires 4 m³ of water. 3 / h, the spindle cooling water consumption can be 2m³ / h. 3 / h. Under normal operating conditions, only the water cooling channel inside the motor housing needs to be turned on for cooling; under high operating conditions, both water cooling channels can be turned on simultaneously for cooling, achieving efficient and reliable cooling.

[0042] Specifically, the power interface of the water-cooled high-temperature resistant fan with the inner hole of the shaft can be three-phase AC 380V, 50Hz, or two-phase AC 220V, 50Hz.

[0043] The cooling water requirement for the water-cooled high-temperature resistant fan inside the main shaft bore can be, for example, a temperature of ≤25℃ and a water volume of 4m³ under normal operating conditions. 3 / h; Water volume 6m³ under high temperature conditions 3 / h. The water pipe connection specification can be, for example, M18 or M24.

[0044] In one embodiment of the main shaft inner hole water-cooled high-temperature resistant fan of this utility model, the water-cooled flow channel 5 is spiral-shaped.

[0045] In this invention, a spiral-shaped water-cooling channel is machined inside the motor housing, and a first inlet and a second outlet are provided connecting the two ends of the water-cooling channel. The interface specification can be M24. The cooling water in the water-cooling channel removes the heat generated by the motor itself and the heat conducted to the housing from the outside. The cooling water in the water-cooling channel can be fresh water, and the flow rate can be 4 m³ / s. 3 / h, temperature not exceeding 25℃.

[0046] The spiral-shaped water-cooling channel allows the coolant to flow along a specific spiral path inside the motor housing, resulting in a larger and more uniform contact area with the motor's heat-generating components. Compared to a straight channel, it can more comprehensively cover the areas inside the motor that require heat dissipation, preventing localized overheating and thus improving overall heat dissipation and ensuring uniform temperature across all parts of the motor. The spiral shape guides the cooling water into a rotating flow, increasing the intensity of convective heat transfer between the cooling water and the channel walls. This rotating flow breaks down the boundary layer, allowing heat to be transferred more effectively from the channel walls to the coolant, removing more heat and improving cooling efficiency. Furthermore, the spiral-shaped channel allows for a longer channel length within a relatively small space. For devices like motors with limited internal space, this provides sufficient cooling paths without significantly increasing the housing volume, effectively utilizing the internal space and making the motor structure more compact. The spiral radius, pitch, and other parameters can be flexibly designed according to the motor's internal structure and heat generation characteristics to adapt to motors of different shapes and sizes, better meeting their cooling needs and achieving optimal cooling within a limited space. Furthermore, the relatively gentle curvature of the spiral flow channel allows for smoother changes in coolant flow direction, unlike right-angle bends or complex-shaped channels that are prone to eddies and turbulence. This reduces flow resistance and pressure loss. Due to the low pressure loss, the coolant can flow at a relatively stable flow rate within the spiral channel, ensuring stable cooling performance. This helps maintain the motor's cooling performance under different operating conditions, enabling reliable operation. Moreover, the spiral flow channel makes the coolant flow smoother, reducing noise caused by fluid impact and vibration. Compared to other channel shapes, the cooling water flow within the spiral channel is more orderly, avoiding sudden impacts and vibrations, thus reducing noise levels during operation and improving motor operating comfort. Additionally, the spiral shape enhances the structural strength of the motor housing to some extent, reducing housing deformation and vibration caused by thermal expansion and contraction, which also contributes to noise reduction.

[0047] In one embodiment of the main shaft inner hole water-cooled high-temperature resistant fan of this utility model, it further includes: a junction box 13 for connecting the motor, the junction box 13 is connected to the motor housing 4, the wires in the junction box 13 pass through the motor housing 4 and are connected to the motor 1 in the motor housing 4, and the junction box 13 and the wires are respectively isolated from the water-cooled flow channel 5.

[0048] 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.

[0049] In one embodiment of the main shaft inner hole water-cooled high-temperature resistant fan of this utility model, the water inlet annular cavity 16 is connected to the main shaft 2 before the motor 1 through the first mechanical sealing structure 41; the water outlet annular cavity 8 is connected to the main shaft 2 between the motor 1 and the impeller 3 through the second mechanical sealing structure 42.

[0050] 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 inlet annular cavity.

[0051] like Figure 3 As shown, in one embodiment of the main shaft inner hole water-cooled high-temperature resistant fan of this utility model, the water inlet annular cavity 16 includes: an upper water inlet part 161 and a lower water inlet part 162, wherein the lower part of the upper water inlet part 161 is provided with a lower water inlet flange 163, and the upper part of the lower water inlet part 162 is provided with an upper water inlet flange 164 that cooperates with the lower water inlet flange to form a seal.

[0052] Here, the heat conducted from the impeller to the main shaft will ultimately affect the bearing performance. Therefore, a water-cooling device can be installed to cool the main shaft. This device is a water-inlet annular cavity located on the outer surface of the main shaft 2 before it enters the motor 1, with a second water inlet on the cavity, such as... Figure 3 As shown, the second water inlet interface can be located in the upper part of the water inlet, and the specification can be M18. The upper and lower parts of the annular cavity are connected to form a closed hollow annular cavity.

[0053] like Figure 3 and 4 As shown, in one embodiment of the main shaft inner hole water-cooled high-temperature resistant fan of this utility model, the water inlet annular cavity includes: a first spring 51, a first moving ring, a thrust ring 54, and a first stationary ring 55, wherein,

[0054] The first moving ring and the first stationary ring are fitted on the main shaft 2 near the lower part of the lower half 162 of the water inlet annular cavity 16; the first moving ring includes a first large ring 52 and a first small ring 53 connected as one piece, the inner diameter of the first large ring and the first small ring are the same, the ring width of the first large ring is greater than the ring width of the first small ring, so that the outer edge of the first large ring protrudes from the outer edge of the first small ring to form a first boss 55.

[0055] The inner ring of one end of the first spring is fitted onto the outer surface of the first small ring of the first moving ring so that the inner side of the first small ring is tightly fitted and sealed with the main shaft 2 to prevent water leakage; the thrust ring is fixed on the main shaft 2, and the top and bottom of the first spring are respectively limited between the first boss and the thrust ring; the bottom surface of the first large ring of the first moving ring is in contact with the top surface of the first stationary ring.

[0056] After the upper and lower inlet flanges are installed together, the first stationary ring fits tightly with the lower half of the inlet annular cavity, and the lower half of the inlet annular cavity presses against the lower surface of the first stationary ring.

[0057] A first gap is left between the inner side of the first stationary ring and the first large ring and the main shaft 2.

[0058] Here, when the main shaft 2 rotates, the water inlet annular cavity 8 remains stationary, and the first moving ring, thrust ring and first spring rotate together with the main shaft 2, so that the moving ring can rotate together with the main shaft 2 when they slide relative to each other.

[0059] The cooling water channel at the top of the spindle is located on the outer surface of the spindle before entering the motor 1. A water inlet annular cavity can be installed on the outer surface of the spindle 2, through which water flows to carry away the heat from the spindle. The water inlet annular cavity and the spindle 2 adopt a first mechanical seal structure to prevent leakage.

[0060] The bottom surface of the small ring of the first moving ring can be provided with structural protrusions, bosses or grooves to limit the spring, prevent it from coming out in the axial direction, and achieve a tight fit between the first large ring and the first stationary ring.

[0061] The inner ring of the first spring fits onto the outer surface of the first small ring of the rotating ring. After the upper and lower inlet flanges are installed together to assemble the upper and lower halves of the inlet annular cavity, the first spring, through its own elasticity, applies an axial force to the first boss of the first large ring of the first rotating ring between the first boss and the thrust ring. Under this force, the first rotating ring is compressed towards the first stationary ring, thereby making the first rotating ring and the first stationary ring come into tight contact, forming a sealing surface to prevent fluid leakage. This ensures that the first large ring of the rotating ring and the first stationary ring fit tightly together, achieving a sealing effect. Relying on the elasticity of the first spring, the bottom surface of the first large ring of the first rotating ring and the first stationary ring can make tight contact.

[0062] The inner diameter of the first spring and the outer diameter of the first small ring of the first moving ring can be precisely designed and machined so that the inner diameter of the first spring is slightly smaller than the outer diameter of the first small ring of the first moving ring. Through interference fit, a certain frictional force is generated to prevent the first spring from coming out, so that the inner side of the first small ring is tightly fitted and sealed with the main shaft.

[0063] like Figure 3 and 5 As shown, in one embodiment of the main shaft inner hole water-cooled high-temperature resistant fan of this utility model, the water outlet annular cavity 8 includes: an upper water outlet part 81 and a lower water outlet part 82, wherein the lower part of the upper water outlet part 81 is provided with a lower water outlet flange 83, and the upper part of the lower water outlet part 82 is provided with an upper water outlet flange 84 that cooperates with the lower water outlet flange 83 to form a seal.

[0064] Here, the heat conducted from the impeller to the main shaft ultimately affects the bearing performance. Therefore, a water-cooling device can be installed to cool the main shaft. This device consists of an annular water outlet cavity located between the impeller and the motor, enclosing the outer surface of the main shaft. A second water outlet is provided on the cavity. Figure 3 As shown, the second outlet can be located in the upper part 81 of the outlet, and the interface specification can be M18. The upper and lower parts of the annular cavity are connected to form a closed hollow annular cavity.

[0065] like Figure 3 As shown, in one embodiment of the main shaft inner bore water-cooled high-temperature resistant fan of this utility model, a sealing gasket 165 is also provided at the sealing connection of the upper and lower inlet flanges; a sealing gasket 85 is also provided at the sealing connection of the upper outlet flange 84 and the lower outlet flange 83 to improve the sealing effect.

[0066] In one embodiment of the main shaft inner bore water-cooled high-temperature resistant fan of this utility model, the second mechanical seal structure includes: a second spring 19, two second moving rings, and two second stationary rings 17, wherein...

[0067] The first second moving ring and the first second stationary ring are fitted on the main shaft 2 near the upper part of the water outlet annular cavity 81, and the second second moving ring and the second second stationary ring are fitted on the main shaft 2 near the lower part of the water outlet annular cavity 82. The first second moving ring and the second second moving ring each include: a second large ring 181 and a second small ring 182 connected as one piece. The inner diameters of the second large ring 181 and the second small ring 182 are the same. The ring width of the second large ring 181 is greater than the ring width of the second small ring 181, so that the outer edge of the second large ring 181 protrudes from the outer edge of the second small ring to form a second boss 183.

[0068] The inner rings at both ends of the second spring 19 are respectively fitted onto the outer sides of the second small ring portion 182 of the first second moving ring and the second small ring portion 182 of the second second moving ring, so that the inner side of the second small ring portion 182 is tightly fitted and sealed with the main shaft 2 to prevent water leakage; the top and bottom of the second spring 19 are respectively limited on the second boss 183 of the large ring portion of the first second moving ring or the second second moving ring; the top surface of the second large ring portion 181 of the first second moving ring contacts the bottom surface of the first second stationary ring 17; the bottom surface of the large ring portion 181 of the second second moving ring contacts the top surface of the second second stationary ring 17.

[0069] After the upper outlet flange 83 and the lower outlet flange 84 are installed together, the first second stationary ring 17 is tightly fitted with the upper outlet half 81 of the outlet annular cavity 8, and the upper outlet half 81 of the outlet annular cavity 8 presses against the upper surface of the first second stationary ring 18; the second second stationary ring 17 is tightly fitted with the second lower half 82 of the outlet annular cavity 8, and the lower outlet half 82 of the outlet annular cavity 8 presses against the lower surface of the second second stationary ring 17.

[0070] A second gap is left between the inner side of the second stationary ring 17 and the second large ring 181 and the main shaft 2.

[0071] Here, when the main shaft 2 rotates, the water outlet annular cavity 8 remains stationary, and the second moving ring and the second spring 19 rotate together with the main shaft 2, so that the second moving ring can rotate together with the main shaft 2 when they slide relative to each other.

[0072] The main shaft cooling water circuit is located on the outer surface of the main shaft 3 between the motor 1 and the impeller 3. A water outlet annular cavity 8 is provided and wrapped around the outer surface of the main shaft 2. Water flows through the water outlet annular cavity 8 to carry away the heat of the main shaft. The water outlet annular cavity 8 and the main shaft 2 adopt a mechanical seal structure to prevent leakage.

[0073] Structural protrusions, bosses, or grooves can be provided on the top or bottom surface of the small ring of the moving ring to provide axial positioning for the spring, prevent it from coming out in the axial direction, and achieve a tight fit between the large ring and the stationary ring.

[0074] The inner ring of the second spring 19 fits onto the outer surface of the second small ring portion 181 of the second moving ring. After the upper outlet flange 83 and the lower outlet flange 84 are fitted together to assemble the upper outlet portion 81 and the lower outlet portion 82 of the outlet annular cavity 8, the second spring 19, between the upper and lower second protrusions, applies an axial force to the second protrusion 183 of the second large ring portion 181 of the second moving ring through its own elastic force. Under the action of this force, the second moving ring is squeezed towards the second stationary ring 17, thereby making the second moving ring and the second stationary ring come into close contact, forming a sealing surface to prevent fluid leakage, and causing the second large ring portion of the second moving ring to fit tightly against the stationary ring to achieve a sealing effect. Relying on the second elastic force of the spring, the bottom or top surface of the second large ring portion of the second moving ring and the stationary ring can make close contact.

[0075] The inner diameter of the second spring 19 and the outer diameter of the small ring of the second moving ring can be precisely designed and machined so that the inner diameter of the second spring is slightly smaller than the outer diameter of the second small ring of the second moving ring. Through interference fit, a certain frictional force is generated to prevent the spring from coming out, so that the inner side of the second small ring is tightly fitted and sealed with the main shaft.

[0076] like Figure 6 and 7As shown, in one embodiment of the main shaft inner hole water-cooled high-temperature resistant fan of this utility model, a cylindrical cover 15 is also included. The motor 1, main shaft 2 and impeller 2 are disposed inside the cover 15. The top and bottom of the cover are open, and the outer side wall of the cover is also provided with a mounting flange 14.

[0077] To prevent the motor and spindle from directly contacting the high-temperature airflow, a casing is installed to completely enclose the motor.

[0078] In one embodiment of the main shaft inner hole water-cooled high-temperature resistant fan of this utility model, the motor housing is covered with high-temperature cotton, and a polytetrafluoroethylene heat insulation board is also provided around the junction box 4.

[0079] To reduce heat transfer from the housing to the motor, high-temperature cotton, polytetrafluoroethylene, or other materials are lined inside the housing for insulation. The high-temperature cotton can be ceramic fiber high-temperature cotton, glass fiber high-temperature cotton, or rock wool high-temperature cotton, etc.

[0080] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0081] 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. Therefore, 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 high-temperature resistant fan with a main shaft inner bore, characterized in that, The system comprises an inlet annular cavity, an outlet annular cavity, a motor, a main shaft, and an impeller. 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 main shaft is provided with an axial cooling water channel and a radial channel, and the outlet end of the axial cooling water channel is connected to the inlet end of the radial channel. A water inlet annular cavity is fitted on the outer surface of the main shaft before it passes through the motor. A second water inlet is provided on the water inlet annular cavity. The water inlet end of the cooling water flow channel is connected to the water inlet annular cavity. A water outlet annular cavity is fitted on the outer surface of the main shaft between the motor and the impeller. A second water outlet is provided on the water outlet annular cavity. The water outlet end of the radial flow channel is connected to the water outlet annular cavity.

2. The water-cooled high-temperature resistant fan with spindle inner bore 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.

3. The water-cooled high-temperature resistant fan with the inner bore of the main shaft as described in claim 1, characterized in that, The inlet annular cavity is connected to the main shaft before the motor through a first mechanical seal structure; the outlet annular cavity is connected to the main shaft between the motor and the impeller through a second mechanical seal structure.

4. The water-cooled high-temperature resistant fan with spindle inner bore as described in claim 3, characterized in that, The water inlet annular cavity includes an upper water inlet section and a lower water inlet section. The lower part of the upper water inlet section is provided with a lower water inlet flange, and the upper part of the lower water inlet section is provided with an upper water inlet flange that cooperates with the lower water inlet flange to form a seal.

5. The water-cooled high-temperature resistant fan with the inner bore of the main shaft as described in claim 4, characterized in that, The water inlet annular cavity includes: a first spring, a first moving ring, a thrust ring, and a first stationary ring, wherein... The first moving ring and the first stationary ring are fitted on the main shaft near the lower part of the water inlet annular cavity. The first moving ring includes a first large ring and a first small ring connected as one piece. The inner diameters of the first large ring and the first small ring are the same. The ring width of the first large ring is greater than the ring width of the first small ring, so that the outer edge of the first large ring protrudes from the outer edge of the first small ring to form a first boss. The inner ring of one end of the first spring is fitted onto the outer surface of the first small ring of the first moving ring so that the inner side of the first small ring is tightly fitted and sealed with the main shaft to prevent water leakage; the thrust ring is fixed on the main shaft, and the top and bottom of the first spring are respectively limited between the first boss and the thrust ring; the bottom surface of the first large ring of the first moving ring is in contact with the top surface of the first stationary ring. After the upper and lower inlet flanges are installed together, the first stationary ring fits tightly with the lower half of the inlet annular cavity, and the lower half of the inlet annular cavity presses against the lower surface of the first stationary ring.

6. The water-cooled high-temperature resistant fan with spindle inner bore as described in claim 3, characterized in that, The water outlet annular cavity includes an upper water outlet section and a lower water outlet section, wherein the lower part of the upper water outlet section is provided with a lower water outlet flange, and the upper part of the lower water outlet section is provided with an upper water outlet flange that cooperates with the lower water outlet flange to form a seal.

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

8. The water-cooled high-temperature resistant fan with spindle inner bore 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.

9. The water-cooled high-temperature resistant fan with spindle inner bore as described in claim 2, characterized in that, The motor housing is also covered with high-temperature cotton, and the junction box is surrounded by a polytetrafluoroethylene heat insulation board.

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