Self-cooling air suspension fan and cooling method thereof

Abstract

The invention discloses a self-cooling air suspension fan and a cooling method thereof, and belongs to the field of fan cooling, the self-cooling air suspension fan comprises a fan shell, a stator and a rotor, the rotor is connected with a main impeller through a first locking pull rod, the fan shell is connected with an end shell, the end shell is provided with an air inlet aligned with the main impeller, and the other end of the fan shell is fixedly provided with an end cover; the motor further comprises an air cooling structure, the air cooling structure comprises an active stator and rotor air cooling unit and a passive bearing cooling unit, and the active stator and rotor air cooling unit comprises an air inducing impeller fixed to the end, away from the main impeller, of the rotor through a second locking pull rod and a stator and rotor cooling air duct. The passive bearing cooling unit comprises an air cooling air return pipe used for communicating the air inlet with the interior of the fan shell and a bearing cooling air channel communicating with the air cooling air return pipe. According to the self-cooling air suspension fan and the cooling method thereof, the mode that active air cooling and passive air cooling are combined is adopted, the interior of the fan can be rapidly cooled, and the cooling effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fan cooling, and in particular to a self-cooling air suspension fan and a cooling method thereof. Background Art

[0002] Air bearing fan is a high-efficiency and energy-saving fan that uses air bearing technology. The core technology of air bearing fan is air bearing. Air bearing uses compressed air as lubricating medium to form a thin air film between the rotor and stator, so that the rotor can rotate at high speed without contact. It has the advantages of high efficiency, energy saving, low noise, long life and maintenance-free, and has gradually become an important equipment in modern industry and environmental protection field.

[0003] The existing air suspension fan heat dissipation structure is as follows: CN202121081986.1 discloses an air suspension fan with a heat dissipation structure, including an air suspension fan assembly, a cooling mechanism and a pin mechanism, wherein the cooling mechanism is arranged on one side of the outside of the air suspension fan assembly; the pin mechanism is fixed inside the air suspension fan assembly; and the filtering mechanism is installed on the other side of the outside of the air suspension fan assembly. Compared with the existing ordinary air suspension fans, the air suspension fan with a heat dissipation structure has multiple copper sheets to absorb the heat generated when the air suspension fan assembly is in operation. The cover of the liquid storage tank is opened to add coolant, and the water pump pumps the coolant in the liquid storage tank into the return pipe. The return pipe cools the copper sheet, which can significantly cool the air suspension fan, so that the air suspension fan has an active heat dissipation function. When the temperature of the air suspension fan is too high, the heat of the air suspension fan can be dissipated in time.

[0004] CN202420395201.5 discloses a cooling structure for an air suspension fan, which includes a base box, an electric control cabinet is installed inside the base box, a fan body is installed inside the base box on one side of the electric control cabinet, an exhaust pipe is connected to the output end of the fan body, an air cooling mechanism is arranged on the base box, and a liquid cooling mechanism is arranged directly below the fan body. The utility model overcomes the shortcomings of the prior art, and by starting the water pump located inside the storage cavity, the coolant inside the storage cavity can be transported to the inside of the water cooling head along the cooling water output pipe, and the water cooling head fits the fan body to absorb the heat of the coolant flowing through the water cooling head, and at the same time, the coolant absorbing the heat can enter the temporary storage cavity along the cooling water return pipe, and the liquid inside the temporary storage cavity can flow back to the storage cavity with the help of the heat dissipation pipe, and the coolant flowing through the heat dissipation pipe can dissipate heat and cool down the outside with the help of the heat sink.

[0005] It can be seen that the cooling structure of existing air suspension fans is mostly liquid cooling, which has the disadvantages of occupying a large space and not completely cooling the inside of the fan. Summary of the invention

[0006] The object of the present invention is to provide a self-cooling air suspension fan and a cooling method thereof to solve the above technical problems.

[0007] To achieve the above-mentioned purpose, the present invention provides a self-cooling air suspension fan, comprising a fan housing, a stator and a rotor arranged in sequence from the outside to the inside, the rotor is connected to the main impeller via a first locking rod, an end shell is connected to one end of the fan housing corresponding to the main impeller, an air inlet aligned with the main impeller is opened on the end shell, and an end cover is fixed to the other end of the fan housing. The present invention also includes an air cooling structure, and the air cooling structure includes an active stator-rotor air cooling unit and a passive bearing cooling unit, wherein the active stator-rotor air cooling unit includes an induced draft impeller fixed to the end of the rotor away from the main impeller via a second locking rod, and a stator-rotor cooling air duct; The passive bearing cooling unit comprises an air-cooling return air duct for connecting the air inlet and the interior of the fan housing, and a bearing cooling air duct connected to the air-cooling return air duct.

[0008] Preferably, the stator and rotor cooling air duct includes a first radial air inlet hole opened on the side wall of the fan housing, a first cooling air section surrounded by the stator outer wall and the inner wall of the fan housing, a second cooling air section surrounded by the stator inner wall and the rotor outer wall, and a first axial air outlet hole opened on the end cover.

[0009] Preferably, an exhaust cover is also provided on the outside of the end cover, and the stator rotor cooling air duct also includes a first radial air outlet hole opened on the side wall of the exhaust cover, and the first radial air inlet hole, the first cooling air section, the second cooling air section, the first axial air outlet hole and the first radial air outlet hole are connected in sequence.

[0010] Preferably, the outer cover of the main impeller is provided with a fairing, the main impeller is rotatably arranged on the main mounting plate through the main bearing and the main balancing plate in sequence, and the main mounting plate is fixed on the fan housing; The left and right ends of the rotor are rotatably connected to the fan housing via the left end bearing and the right end bearing respectively; The bearing cooling air duct includes a first bearing cooling air section, a second bearing cooling air section and a third bearing cooling air section for cooling the main bearing, the left end bearing and the right end bearing respectively, wherein the first bearing cooling air section is connected to the air cooling return air duct, and the second bearing cooling air section and the third bearing cooling air section are both connected to the stator and rotor cooling air duct.

[0011] Preferably, the first bearing cooling air section includes a first axial air inlet hole opened in the center of the fairing, a second axial air inlet hole opened on the main impeller, a second radial air inlet hole opened on the main impeller, and a cooling cavity surrounded by the main bearing, the fan housing and the main mounting plate; The air inlet is in circular communication with the first axial air inlet hole, the second axial air inlet hole, the second radial air inlet hole, the cooling cavity and the air-cooling return air duct.

[0012] Preferably, the second bearing cooling air section includes a first axial air inlet hole, a third axial air inlet hole opened on the first locking rod, a fourth axial air inlet hole opened at one end of the rotor, and a second radial air outlet hole opened on the left and right side walls of the rotor; The air inlet is connected in sequence to the first axial air inlet hole, the second axial air inlet hole, the third axial air inlet hole, the fourth axial air inlet hole, the second radial air outlet hole, the second cooling air section, the first axial air outlet hole and the first radial air outlet hole.

[0013] Preferably, a sealing cap is provided at the center of the exhaust housing; The third bearing cooling air section includes a fifth axial air inlet hole opened at the center of the sealing cap, a sixth axial air inlet hole opened on the second locking rod, and a seventh axial air inlet hole opened at the other end of the rotor. The fifth axial air inlet hole, the sixth axial air inlet hole, the seventh axial air inlet hole, the second radial air outlet hole, the second cooling air section, the first axial air outlet hole and the first radial air outlet hole are connected in sequence.

[0014] A cooling method for a self-cooling air suspension fan, including a stator and rotor cooling method and a bearing cooling method; The stator and rotor cooling method is as follows: the rotor drives the induced draft impeller to rotate so that negative pressure is generated inside the fan housing, and external cold air enters the fan housing through the first radial air inlet hole, and then passes through the first cooling air section, the second cooling air section, and the first axial air outlet hole in sequence, and then is discharged from the fan housing through the first radial air outlet hole, and when the cold air flows through the second cooling air section, the stator and the rotor are cooled at the same time; The bearing cooling method includes a main bearing cooling method, a left-end bearing cooling method and a right-end bearing cooling method. The main bearing cooling method is as follows: the rotor drives the main impeller to rotate, so that the static pressure of the air inlet is lower than the ambient static pressure. Since the air-cooled return air duct connects the cooling cavity and the air inlet, the pressure of the cooling cavity is lower than the ambient static pressure. The total pressure on the windward side of the main impeller is the sum of the dynamic pressure and the static pressure. Therefore, the total pressure on the windward side of the main impeller is higher than the pressure of the cooling cavity, that is, the total pressure of the first axial air inlet hole on the fairing is higher than the pressure of the cooling cavity, thereby generating a pressure difference. Under the action of the pressure difference, external cold air is discharged from the air inlet, the first axial air inlet hole, the second axial air inlet hole, the second radial air inlet hole, the cooling cavity and the air-cooled return air duct, and the main bearing is cooled after the cold air enters the cooling cavity. The cooling method for the left-end bearing and the right-end bearing is as follows: during the rotation of the rotor, the gas inside the rotor is discharged from the second radial air outlet under the action of centrifugal force, resulting in a negative pressure state inside the rotor, and external cold air enters through the air inlet and the fifth axial air inlet respectively, wherein the cold air entering from the air inlet is discharged through the first axial air inlet, the second axial air inlet, the third axial air inlet, the fourth axial air inlet, the second radial air outlet, the second cooling air section, the first axial air outlet and the first radial air outlet in sequence, and cools the left-end bearing after entering the fan housing through the second radial air outlet; at the same time, the cold air entering from the fifth axial air inlet is discharged through the sixth axial air inlet, the seventh axial air inlet, the second radial air outlet, the second cooling air section, the first axial air outlet and the first radial air outlet in sequence, and cools the right-end bearing after entering the fan housing through the second radial air outlet.

[0015] Therefore, the present invention adopts the above-mentioned self-cooling air suspension fan and cooling method thereof, which has the following beneficial effects: 1. Efficient cooling: Stator and rotor cooling: Through the design of the induced draft impeller and cooling air duct, the cold air can effectively flow through the stator and rotor to take away the heat. When the rotor drives the induced draft impeller to rotate, negative pressure is formed in the fan housing. External cold air is sucked in and discharged through multiple cooling air ducts, ensuring that the stator and rotor are always in a low temperature state, improving operating efficiency and stability; Bearing cooling: The main bearing, left end bearing and right end bearing are cooled through independent cooling air ducts, which effectively reduces the bearing temperature and prolongs the bearing life.

[0016] 2. Compact and integrated structure: The cooling structure is integrated with the fan body, which reduces the need for additional cooling equipment, space occupation and installation complexity; for example, the fairing, induced draft impeller, cooling air duct and other components are cleverly combined inside the fan, achieving a compact integrated design; 3. No additional power consumption: The cooling system relies on the operation of the fan itself to drive the air flow, without the need for additional power source or pumping equipment, saving energy consumption; 4. High reliability: Since the cooling system is closely integrated with the fan body and adopts the principle of natural ventilation and negative pressure, the wear and failure rate of mechanical parts are reduced, thereby reducing maintenance costs and frequency; 5. Strong environmental adaptability: It maintains good cooling effect under different environmental conditions and is suitable for a variety of harsh environments such as high temperature and high humidity, especially for flammable and explosive places, avoiding the safety hazards caused by the use of liquid cooling; 6. Low noise: The design of the cooling air duct and the induced draft impeller has been optimized to make the airflow smoother, reduce air turbulence and noise generation, especially in residential areas or noise-sensitive environments, this low-noise design has obvious advantages.

[0017] In summary, the present invention not only has efficient cooling performance, but also significantly improves the overall performance and application range of the fan through the advantages of compact integrated design, energy saving effect, high reliability and low noise, thereby ensuring long-term stable operation of the fan.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is an axial cross-sectional view of a self-cooling air suspension fan of the present invention.

[0020] Reference numerals 1. Air inlet; 2. Fairing; 3. Main impeller; 4. End shell; 5. Main mounting plate; 6. Stator; 7. Fan housing; 8. First radial air inlet; 9. End cover; 10. First radial air outlet; 11. Exhaust cover; 12. Sealing cap; 13. Fifth axial air inlet; 14. Second locking rod; 15. Sixth axial air inlet; 16. induced draft impeller; 17. First axial air outlet; 18. Second radial air outlet; 19. Left end bearing; 20. Main bearing; 21. Air-cooled return air duct; 22. Main balancing plate; 23. Third axial air inlet; 24. First locking rod; 25. First axial air inlet; 26. Second cooling air section; 27. First cooling air section; 28. Right end bearing; 29. ​​Second axial air inlet. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not used to limit the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0022] It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or devices.

[0023] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1 As shown, a self-cooling air suspension fan comprises a fan casing 7, a stator 6 and a rotor which are arranged in sequence from the outside to the inside, the rotor is connected to the main impeller 3 via a first locking rod 24, an end shell 4 is connected to the fan casing 7 and one end corresponding to the main impeller 3, an air inlet 1 aligned with the main impeller 3 is opened on the end shell 4, an end cover 9 is fixed to the other end of the fan casing 7, the present invention also comprises an air cooling structure, the air cooling structure comprises an active stator and rotor air cooling unit and a passive bearing cooling unit, wherein the active stator and rotor air cooling unit comprises an induced draft impeller 16 fixed to the end of the rotor away from the main impeller 3 via a second locking rod 14, and a stator and rotor cooling air duct; the passive bearing cooling unit comprises an air cooling return air duct 21 for connecting the air inlet 1 and the inside of the fan casing 7, and a bearing cooling air duct connected to the air cooling return air duct 21.

[0025] Specifically, the stator-rotor cooling air duct includes a first radial air inlet hole 8 provided on the side wall of the fan housing 7, a first cooling air section 27 formed between the outer wall of the stator 6 and the inner wall of the fan housing 7, a second cooling air section 26 formed between the inner wall of the stator 6 and the outer wall of the rotor, and a first axial air outlet hole 17 provided on the end cover 9. An exhaust housing 11 is also provided outside the end cover 9, and the stator-rotor cooling air duct also includes a first radial air outlet hole 10 provided on the side wall of the exhaust housing 11, and the first radial air inlet hole 8, the first cooling air section 27, the second cooling air section 26, the first axial air outlet hole 17 and the first radial air outlet hole 10 are sequentially connected.

[0026] The outer cover of the main impeller 3 is provided with a fairing 2, and the main impeller 3 is rotatably arranged on the main mounting plate 5 via the main bearing 20 and the main balancing plate 22 in turn, and the main mounting plate 5 is fixed on the fan housing 7; the left and right ends of the rotor are rotatably connected to the fan housing 7 via the left end bearing 19 and the right end bearing 28 respectively; the bearing cooling air duct includes a first bearing cooling air section, a second bearing cooling air section and a third bearing cooling air section for cooling the main bearing 20, the left end bearing 19 and the right end bearing 28 respectively, wherein the first bearing cooling air section is connected to the air cooling return air duct 21, and the second bearing cooling air section and the third bearing cooling air section are both connected to the stator and rotor cooling air duct.

[0027] Among them, the first bearing cooling air section includes a first axial air inlet hole 25 opened in the center of the fairing 2, a second axial air inlet hole 29 opened on the main impeller 3, a second radial air inlet hole opened on the main impeller 3, and a cooling cavity surrounded by the main bearing 20, the fan housing 7 and the main mounting plate 5; the air inlet 1 is cyclically connected with the first axial air inlet hole 25, the second axial air inlet hole 29, the second radial air inlet hole, the cooling cavity and the air-cooled return air duct 21.

[0028] The second bearing cooling air section includes a first axial air inlet hole 25, a third axial air inlet hole 23 opened on the first locking rod 24, a fourth axial air inlet hole opened at one end of the rotor and a second radial air outlet hole 18 opened on the left and right side walls of the rotor; the air inlet 1 is connected with the first axial air inlet hole 25, the second axial air inlet hole 29, the third axial air inlet hole 23, the fourth axial air inlet hole, the second radial air outlet hole 18, the second cooling air section 26, the first axial air outlet hole 17 and the first radial air outlet hole 10 in sequence.

[0029] A sealing cap 12 is provided at the center of the exhaust cover 11; the third bearing cooling air section includes a fifth axial air inlet hole 13 opened at the center of the sealing cap 12, a sixth axial air inlet hole 15 opened on the second locking rod 14, and a seventh axial air inlet hole opened at the other end of the rotor. The fifth axial air inlet hole 13, the sixth axial air inlet hole 15, the seventh axial air inlet hole, the second radial air outlet hole 18, the second cooling air section 26, the first axial air outlet hole 17 and the first radial air outlet hole 10 are connected in sequence.

[0030] A cooling method for a self-cooling air suspension fan, including a stator and rotor cooling method and a bearing cooling method; The stator and rotor cooling method is as follows: the rotor drives the induced draft impeller 16 to rotate so that negative pressure is generated inside the fan housing 7, and the external cold air enters the fan housing 7 through the first radial air inlet hole 8, and then passes through the first cooling air section 27, the second cooling air section 26, and the first axial air outlet hole 17 in sequence, and then is discharged from the fan housing 7 through the first radial air outlet hole 10, and when the cold air flows through the second cooling air section 26, the stator 6 and the rotor are cooled at the same time; The bearing cooling method includes a main bearing 20 cooling method, a left end bearing 19 cooling method and a right end bearing 28 cooling method. The main bearing 20 cooling method is as follows: the rotor drives the main impeller 3 to rotate, so that the static pressure of the air inlet is lower than the ambient static pressure. Since the air-cooled return air duct 21 connects the cooling cavity and the air inlet 1, the pressure of the cooling cavity is lower than the ambient static pressure. The total pressure on the windward side of the main impeller 3 is the sum of the dynamic pressure and the static pressure. Therefore, the total pressure on the windward side of the main impeller 3 is higher than the pressure of the cooling cavity, that is, the total pressure of the first axial air inlet hole 25 on the fairing 2 is higher than the pressure of the cooling cavity, thereby generating a pressure difference. Under the action of the pressure difference, external cold air is discharged from the air inlet, the first axial air inlet hole 25, the second axial air inlet hole 29, the second radial air inlet hole, the cooling cavity and the air-cooled return air duct 21, and the main bearing 20 is cooled after the cold air enters the cooling cavity. The cooling method of the left end bearing 19 and the right end bearing 28 is as follows: during the rotation of the rotor, the gas inside the rotor is discharged from the second radial air outlet 18 under the action of centrifugal force, resulting in a negative pressure state inside the rotor, and the external cold air enters through the air inlet 1 and the fifth axial air inlet 13 respectively, wherein the cold air entering from the air inlet 1 passes through the first axial air inlet 25, the second axial air inlet 29, the third axial air inlet 23, the fourth axial air inlet, the second radial air outlet 18, the second cooling air section 26, the third axial air inlet 27, the fourth axial air inlet, the second radial air outlet 18, the second cooling air section 26, the fifth axial air inlet 13, the fifth axial air inlet 14, the fifth axial air inlet 15, the fifth axial air inlet 16, the fifth axial air inlet 17, the fifth axial air inlet 18, the fifth axial air inlet 19, the fifth axial air inlet 28, the fifth axial air inlet 29, the fifth axial air inlet 23, the fifth axial air inlet 28, the fifth axial air inlet 19, the fifth axial air inlet 18, the fifth axial air inlet 19, the fifth axial air inlet 13, the fifth axial air inlet 13, the fifth axial air inlet 14, the fifth axial air inlet 15, the fifth axial air inlet 16, the fifth axial air inlet 18, the fifth axial air inlet 19, the fifth axial air inlet 13 ... The cold air is discharged through the first axial air outlet hole 17 and the first radial air outlet hole 10, and cools the left end bearing 19 after entering the fan housing 7 through the second radial air outlet hole 18; at the same time, the cold air entering through the fifth axial air inlet hole 13 is discharged through the sixth axial air inlet hole 15, the seventh axial air inlet hole, the second radial air outlet hole 18, the second cooling air section 26, the first axial air outlet hole 17 and the first radial air outlet hole 10 in sequence, and cools the right end bearing 28 after entering the fan housing 7 through the second radial air outlet hole 18.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A self-cooling air suspension fan, comprising a fan housing, a stator and a rotor arranged in sequence from outside to inside, the rotor is connected to the main impeller via a first locking rod, an end shell is connected to one end of the fan housing corresponding to the main impeller, an air inlet aligned with the main impeller is opened on the end shell, and an end cover is fixed to the other end of the fan housing, characterized in that: It also includes an air cooling structure, which includes an active stator-rotor air cooling unit and a passive bearing cooling unit, wherein the active stator-rotor air cooling unit includes an induced draft impeller fixed to an end of the rotor away from the main impeller via a second locking rod and a stator-rotor cooling air duct; The passive bearing cooling unit comprises an air-cooling return air duct for connecting the air inlet and the interior of the fan housing, and a bearing cooling air duct connected to the air-cooling return air duct.

2. A self-cooling air suspension fan according to claim 1, characterized in that: The stator and rotor cooling air duct includes a first radial air inlet hole opened on the side wall of the fan housing, a first cooling air section surrounded by the stator outer wall and the inner wall of the fan housing, a second cooling air section surrounded by the stator inner wall and the rotor outer wall, and a first axial air outlet hole opened on the end cover.

3. A self-cooling air suspension fan according to claim 2, characterized in that: An exhaust cover is also provided on the outside of the end cover, and the stator rotor cooling air duct also includes a first radial air outlet hole opened on the side wall of the exhaust cover, and the first radial air inlet hole, the first cooling air section, the second cooling air section, the first axial air outlet hole and the first radial air outlet hole are connected in sequence.

4. A self-cooling air suspension fan according to claim 3, characterized in that: The outer cover of the main impeller is provided with a fairing, and the main impeller is rotated and arranged on the main mounting plate through the main bearing and the main balance plate in sequence, and the main mounting plate is fixed on the fan housing; The left and right ends of the rotor are rotatably connected to the fan housing via the left end bearing and the right end bearing respectively; The bearing cooling air duct includes a first bearing cooling air section, a second bearing cooling air section and a third bearing cooling air section for cooling the main bearing, the left end bearing and the right end bearing respectively, wherein the first bearing cooling air section is connected to the air cooling return air duct, and the second bearing cooling air section and the third bearing cooling air section are both connected to the stator and rotor cooling air duct.

5. A self-cooling air suspension fan according to claim 4, characterized in that: The first bearing cooling air section includes a first axial air inlet hole opened in the center of the fairing, a second axial air inlet hole opened on the main impeller, a second radial air inlet hole opened on the main impeller, and a cooling cavity surrounded by the main bearing, the fan housing and the main mounting plate; The air inlet is in circular communication with the first axial air inlet hole, the second axial air inlet hole, the second radial air inlet hole, the cooling cavity and the air-cooling return air duct.

6. A self-cooling air suspension fan according to claim 5, characterized in that: The second bearing cooling air section includes a first axial air inlet hole, a third axial air inlet hole opened on the first locking rod, a fourth axial air inlet hole opened at one end of the rotor, and a second radial air outlet hole opened on the left and right side walls of the rotor; The air inlet is connected in sequence to the first axial air inlet hole, the second axial air inlet hole, the third axial air inlet hole, the fourth axial air inlet hole, the second radial air outlet hole, the second cooling air section, the first axial air outlet hole and the first radial air outlet hole.

7. A self-cooling air suspension fan according to claim 6, characterized in that: A sealing cap is provided at the center of the exhaust housing; The third bearing cooling air section includes a fifth axial air inlet hole opened at the center of the sealing cap, a sixth axial air inlet hole opened on the second locking rod, and a seventh axial air inlet hole opened at the other end of the rotor. The fifth axial air inlet hole, the sixth axial air inlet hole, the seventh axial air inlet hole, the second radial air outlet hole, the second cooling air section, the first axial air outlet hole and the first radial air outlet hole are connected in sequence.

8. A cooling method for a self-cooling air suspension fan according to claim 7, characterized in that: Including a stator and rotor cooling method and a bearing cooling method; The stator and rotor cooling method is as follows: the rotor drives the induced draft impeller to rotate so that negative pressure is generated inside the fan housing, and external cold air enters the fan housing through the first radial air inlet hole, and then passes through the first cooling air section, the second cooling air section, and the first axial air outlet hole in sequence, and then is discharged from the fan housing through the first radial air outlet hole, and when the cold air flows through the second cooling air section, the stator and the rotor are cooled at the same time; The bearing cooling method includes a main bearing cooling method, a left-end bearing cooling method and a right-end bearing cooling method. The main bearing cooling method is as follows: the rotor drives the main impeller to rotate, so that the static pressure of the air inlet is lower than the ambient static pressure. Since the air-cooled return air duct connects the cooling cavity and the air inlet, the pressure of the cooling cavity is lower than the ambient static pressure. The total pressure on the windward side of the main impeller is the sum of the dynamic pressure and the static pressure. Therefore, the total pressure on the windward side of the main impeller is higher than the pressure of the cooling cavity, that is, the total pressure of the first axial air inlet hole on the fairing is higher than the pressure of the cooling cavity, thereby generating a pressure difference. Under the action of the pressure difference, external cold air is discharged from the air inlet, the first axial air inlet hole, the second axial air inlet hole, the second radial air inlet hole, the cooling cavity and the air-cooled return air duct, and the main bearing is cooled after the cold air enters the cooling cavity. The cooling method for the left-end bearing and the right-end bearing is as follows: during the rotation of the rotor, the gas inside the rotor is discharged from the second radial air outlet under the action of centrifugal force, resulting in a negative pressure state inside the rotor, and external cold air enters through the air inlet and the fifth axial air inlet respectively, wherein the cold air entering from the air inlet is discharged through the first axial air inlet, the second axial air inlet, the third axial air inlet, the fourth axial air inlet, the second radial air outlet, the second cooling air section, the first axial air outlet and the first radial air outlet in sequence, and cools the left-end bearing after entering the fan housing through the second radial air outlet; at the same time, the cold air entering from the fifth axial air inlet is discharged through the sixth axial air inlet, the seventh axial air inlet, the second radial air outlet, the second cooling air section, the first axial air outlet and the first radial air outlet in sequence, and cools the right-end bearing after entering the fan housing through the second radial air outlet.

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