Cooling air path for driving motor of primary helium fan

Abstract

The invention belongs to the technical field of primary helium fans, and particularly relates to a primary helium fan driving motor cooling air path. In a cooling air path, the space among an upper electromagnetic bearing, an impeller, a motor upper cover and an upper electromagnetic bearing end cover is an upper electromagnetic bearing air area, and the space among the upper electromagnetic bearing end cover, the upper sides of a stator and a rotor, a rotating shaft and a machine base is a motor stator air area; the space among the lower sides of the lower electromagnetic bearing end cover, the stator and the rotor, the rotating shaft and the base is a lower electromagnetic bearing wind area, the space among the middle flange, the lower electromagnetic bearing end cover and the base is a lower auxiliary bearing wind area, and the cooler, the upper electromagnetic bearing wind area, the motor stator wind area, the lower electromagnetic bearing wind area and the lower auxiliary bearing wind area are communicated in sequence; a space among the outer shell, the fan shell top cover and the base is an outer wind path; a rotating shaft axial hole is formed in the rotating shaft, the upper portion of the rotating shaft axial hole is through, and the lower portion of the rotating shaft axial hole is communicated with the lower auxiliary bearing wind area. According to the cooling air path for the driving motor of the primary helium fan, the temperature rise of the motor is effectively controlled by reasonably arranging the air path.

Description

Technical Field

[0001] The invention belongs to the technical field of main helium blowers, and in particular relates to a cooling air path for a main helium blower drive motor. Background Art

[0002] Due to its inherent safety and potential economic competitiveness, the high temperature gas-cooled reactor has been recognized by the world nuclear energy community as one of the preferred reactor types with the characteristics of the fourth-generation nuclear energy system. The development of high temperature gas-cooled reactor technology is of great significance to my country's sustainable development. The high temperature gas-cooled reactor is an advanced nuclear reactor technology, which usually uses helium as a coolant and heat transfer medium. The main helium blower of the high temperature gas-cooled reactor is in the pressure environment of the primary circuit medium helium coolant, providing sufficient flow and pressure rise to meet its flow and heat transfer requirements. It is the core equipment of the primary circuit of the high temperature gas-cooled reactor.

[0003] The main helium blower drive motor is installed inside the pressure vessel at the top of the steam generator. The high-temperature and high-pressure (250°C, 7MPa) helium in the working chamber outside the motor continuously inputs heat into the chamber where the drive motor is located through heat exchange, heat convection, heat conduction, heat radiation, etc. At the same time, when the main helium blower drive motor is running, it and the electromagnetic bearing generate a lot of heat. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, an object of the present invention is to provide a main helium blower driven motor cooling air path which effectively controls the temperature rise of the motor by reasonably setting the air path.

[0005] The technical solution adopted by the present invention is:

[0006] The main helium fan drives the motor cooling air path, including an outer shell and a fan casing top cover connected to the top of the outer shell, a base is fixed in the outer shell, and a rotating shaft is arranged in the base;

[0007] An intermediate flange is connected to the bottom of the outer shell, and a sealing member is connected between the intermediate flange and the rotating shaft; a lower electromagnetic bearing is installed at the lower part of the rotating shaft, and a lower electromagnetic bearing end cover is connected between the lower electromagnetic bearing and the machine base; a rotor is installed on the rotating shaft, and a stator is arranged between the rotor and the machine base; an upper electromagnetic bearing is installed at the upper part of the rotating shaft, and an upper electromagnetic bearing end cover is connected between the upper electromagnetic bearing and the machine base, and a motor upper cover is connected to the upper side of the upper electromagnetic bearing end cover, and the upper electromagnetic bearing is located in the motor upper cover; an impeller is connected to the upper end of the rotating shaft, and a cooler is connected to the upper side of the motor upper cover, and the cooler is located above the impeller;

[0008] The space between the upper electromagnetic bearing, the impeller, the upper cover of the motor and the upper electromagnetic bearing end cover is the upper electromagnetic bearing wind zone, the space between the upper electromagnetic bearing end cover, the upper side of the stator and the rotor, the rotating shaft and the machine base is the motor stator wind zone, the space between the lower electromagnetic bearing end cover, the lower side of the stator and the rotor, the rotating shaft and the machine base is the lower electromagnetic bearing wind zone, the space between the middle flange, the lower electromagnetic bearing end cover and the machine base is the lower auxiliary bearing wind zone, the cooler, the upper electromagnetic bearing wind zone, the motor stator wind zone, the lower electromagnetic bearing wind zone and the lower auxiliary bearing wind zone are connected in sequence; the space between the outer shell, the fan housing top cover and the machine base is the external wind path, the upper opening of the cooler is connected to the external wind path, and the lower electromagnetic bearing wind zone is connected to the external wind path; an axial hole of the rotating shaft is provided in the rotating shaft, the upper part of the axial hole of the rotating shaft is through, and the lower part of the axial hole of the rotating shaft is connected to the lower auxiliary bearing wind zone.

[0009] In order to avoid overheating and damage of electrical equipment in the main helium blower motor cavity, the present invention installs a helium-water cooler in the steam generator chamber on the upper part of the main helium blower drive motor to continuously cool the helium medium and electrical equipment in the main helium blower motor cavity. The cooling of the electrical equipment in the main helium blower motor cavity is achieved by circulating helium in the motor cavity. When the main helium blower drive motor rotates, the auxiliary impeller installed on the top of the motor allows the helium gas to flow through the electrical equipment, and then flows through the cooler installed on the end cover of the blower housing, and the heat is taken away by the cooling water flowing through the cooler.

[0010] The cooler, the upper electromagnetic bearing wind zone, the motor stator wind zone, the lower electromagnetic bearing wind zone and the lower auxiliary bearing wind zone are connected in sequence, and the lower side of the cooler, the axial hole of the shaft and the lower auxiliary bearing wind zone are connected to form two inner air paths. The inner air path forms a circulating air path with the outer air path through the cooler, so that all parts of the stator, rotor and shaft can be effectively cooled, and the temperature rise of the motor can be accurately controlled.

[0011] The present invention can achieve that under rated working conditions (7MPa helium), the temperature rise of the stator and rotor are both lower than 100°C. After the cooler is cut off from water for 120s, the temperature rise of the stator and rotor are both lower than 100°C. Under factory working conditions (1MPa nitrogen), the temperature rise of the stator and rotor are both lower than 120°C. The ventilation cooling system can ensure the long-term stable operation of the motor.

[0012] As a preferred solution of the present invention, the motor stator wind zone includes a first wind path, a second wind path, a third wind path and a fourth wind path. Each wind path in the motor stator wind zone can lead cooling air to each area between the stator, the rotor and the base to ensure the cooling effect.

[0013] As a preferred solution of the present invention, an inner air guide groove is provided between the base and the stator, a wind shield is provided on the top of the inner air guide groove, the upper electromagnetic bearing wind zone, the wind shield, the inner air guide groove and the lower electromagnetic bearing wind zone are connected in sequence; the first air path passes through the wind shield and the inner air guide groove, and finally enters the lower electromagnetic bearing wind zone. The cooling air passes through the first air path, and the outer wall of the stator is fully cooled.

[0014] As a preferred solution of the present invention, the rotor is provided with rotor axial wind grooves and rotor radial wind grooves that are interconnected, and an air gap is provided between the rotor and the stator; the second wind path passes through the rotor axial wind grooves and the rotor radial wind grooves, and then enters the air gap between the stator and the rotor. The cooling wind passes through the second wind path, and the rotor axial wind grooves, the rotor radial wind grooves, and the air gap between the stator and the rotor are fully cooled.

[0015] As a preferred solution of the present invention, a stator ventilation auxiliary slot is provided inside the stator, and a stator radial wind groove is provided inside the stator; the third wind path passes through the air gap between the stator and the rotor, the stator ventilation auxiliary slot, and after merging with the wind from the second wind path, enters the closed space formed by the machine base and the stator core through the stator radial wind groove, and finally enters the lower electromagnetic bearing wind area. The cooling wind passes through the bottom single wind path, and the inside of the stator is fully cooled.

[0016] As a preferred embodiment of the present invention, electromagnetic end covers for limiting the stator are provided on the upper and lower sides of the stator, and the electromagnetic end covers are fixed in the machine base. Ventilation holes are provided on the electromagnetic end covers on the lower side of the stator, and the closed space formed by the machine base and the stator core, the ventilation holes and the lower electromagnetic bearing wind zone are connected in sequence.

[0017] As a preferred solution of the present invention, an outer air guide groove is provided inside the machine base, and the upper electromagnetic bearing wind area, the outer air guide groove and the lower auxiliary bearing wind area are connected in sequence; the fourth air path passes through the outer air guide groove and enters the lower auxiliary bearing wind area. The cooling air passes through the fourth air path, and the machine base is fully cooled.

[0018] As a preferred solution of the present invention, part of the cold air coming out of the cooler enters the axial hole of the rotating shaft and then reaches the lower auxiliary bearing wind zone, and the other part enters the upper electromagnetic bearing wind zone through the impeller.

[0019] As a preferred embodiment of the present invention, the helium gas flows through the axial hole of the rotating shaft to the wind path of the lower auxiliary bearing wind zone, and the pressure head generated by the rotation of the wind duct inside the rotating shaft drives the helium gas to flow; the helium gas flows through the impeller to the wind path of the upper electromagnetic bearing wind zone, and the pressure head generated by the rotation of the impeller and the rotor drives the helium gas to flow.

[0020] As a preferred solution of the present invention, a connecting hole for connecting the lower electromagnetic bearing wind zone and the lower auxiliary bearing wind zone is provided on the lower electromagnetic bearing end cover, and the connecting hole is inclined toward the center of the rotating shaft from bottom to top. The inclined connecting hole can allow cooling air to fill every corner of the lower electromagnetic bearing wind zone, thereby improving the cooling effect.

[0021] The beneficial effects of the present invention are:

[0022] The cooler, upper electromagnetic bearing wind zone, motor stator wind zone, lower electromagnetic bearing wind zone and lower auxiliary bearing wind zone of the present invention are connected in sequence, the lower side of the cooler, the axial hole of the rotating shaft and the lower auxiliary bearing wind zone are connected to form two inner wind paths, and the inner wind path forms a circulating wind path with the outer wind path through the cooler, so that the stator, rotor and each part of the rotating shaft can be effectively cooled, and the temperature rise of the motor can be accurately controlled. The present invention can achieve that under the rated working condition (7MPa helium), the temperature rise of the stator and rotor are both lower than 100℃, and after the cooler is cut off from water for 120s, the temperature rise of the stator and rotor are both lower than 100℃, and under the factory working condition (1MPa nitrogen), the temperature rise of the stator and rotor are both lower than 120℃, and the ventilation cooling system can ensure the long-term stable operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of the present invention in the vertical direction;

[0024] Figure 2 It is a cross-sectional view of the present invention in the horizontal direction.

[0025] In the figure: 1-outer shell; 2-fan casing top cover; 3-base; 4-lower electromagnetic bearing; 5-lower electromagnetic bearing end cover; 6-stator; 7-rotor; 8-upper electromagnetic bearing end cover; 9-upper electromagnetic bearing; 10-motor upper cover; 11-impeller; 12-cooler; 13-air gap; 14-rotating shaft; 15-middle flange; 16-electromagnetic end cover; 100-upper electromagnetic bearing wind zone; 200-motor stator wind zone; 300-lower electromagnetic bearing wind zone; 400-lower auxiliary bearing wind zone; 301-wind shield; 302-inner air guide groove; 303-outer air guide groove; 601-stator core; 602-stator radial wind groove; 603-stator ventilation auxiliary groove; 701-rotor axial ventilation groove; 702-rotor radial ventilation groove; 703-rotating shaft axial hole. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0028] like Figure 1 and Figure 2 As shown, the cooling air path of the main helium blower driving motor of this embodiment includes an outer shell 1 and a blower casing top cover 2 connected to the top of the outer shell 1. A base 3 is fixed in the outer shell 1, and a rotating shaft 14 is arranged in the base 3.

[0029] The bottom of the outer shell 1 is connected with an intermediate flange 15, and a seal is connected between the intermediate flange 15 and the rotating shaft 14; the lower part of the rotating shaft 14 is installed with a lower electromagnetic bearing 4, and the lower electromagnetic bearing 4 is connected with a lower electromagnetic bearing end cover 5 between the machine base 3; the rotating shaft 14 is installed with a rotor 7, and a stator 6 is arranged between the rotor 7 and the machine base 3; the upper part of the rotating shaft 14 is installed with an upper electromagnetic bearing 9, and the upper electromagnetic bearing 9 is connected with an upper electromagnetic bearing end cover 8 between the machine base 3, and the upper side of the upper electromagnetic bearing end cover 8 is connected with a motor upper cover 10, and the upper electromagnetic bearing 9 is located in the motor upper cover 10; the upper end of the rotating shaft 14 is connected with an impeller 11, and the upper side of the motor upper cover 10 is connected with a cooler 12, and the cooler 12 is located above the impeller 11;

[0030] The space between the upper electromagnetic bearing 9, the impeller 11, the motor upper cover 10 and the upper electromagnetic bearing end cover 8 is the upper electromagnetic bearing wind zone 100, the space between the upper electromagnetic bearing end cover 8, the stator 6 and the upper side of the rotor 7, the rotating shaft 14 and the machine base 3 is the motor stator wind zone 200, the space between the lower electromagnetic bearing end cover 5, the lower side of the stator 6 and the rotor 7, the rotating shaft 14 and the machine base 3 is the lower electromagnetic bearing wind zone 300, the space between the intermediate flange 15, the lower electromagnetic bearing end cover 5 and the machine base 3 is the lower auxiliary bearing wind zone 400, the cooler 12. The upper electromagnetic bearing wind zone 100, the motor stator wind zone 200, the lower electromagnetic bearing wind zone 300 and the lower auxiliary bearing wind zone 400 are connected in sequence; the space between the outer shell 1, the fan casing top cover 2 and the base 3 is the external wind path, the upper opening of the cooler 12 is connected to the external wind path, and the lower electromagnetic bearing wind zone 300 is connected to the external wind path; the shaft 14 is provided with a shaft axial hole 703, the upper part of the shaft axial hole 703 is through, and the lower part of the shaft axial hole 703 is connected to the lower auxiliary bearing wind zone 400.

[0031] In order to avoid overheating and damage of the electrical equipment in the main helium blower motor cavity, the present invention installs a helium-water cooler 12 in the steam generator chamber on the upper part of the main helium blower drive motor to continuously cool the helium medium and electrical equipment in the main helium blower motor cavity. The cooling of the electrical equipment in the main helium blower motor cavity is achieved by circulating helium in the motor cavity. When the main helium blower drive motor rotates, the auxiliary impeller 11 installed on the top of the motor allows the helium gas to flow through the electrical equipment, and then flows through the cooler 12 installed on the end cover of the blower housing, and the heat is taken away by the cooling water flowing through the cooler 12.

[0032] The cooler 12, the upper electromagnetic bearing wind zone 100, the motor stator wind zone 200, the lower electromagnetic bearing wind zone 300 and the lower auxiliary bearing wind zone 400 are connected in sequence, and the lower side of the cooler 12, the axial hole 703 of the rotating shaft and the lower auxiliary bearing wind zone 400 are connected to form two inner wind paths, and the inner wind path forms a circulating wind path with the outer wind path through the cooler 12, so that each part of the stator 6, the rotor 7 and the rotating shaft 14 can be effectively cooled, and the temperature rise of the motor can be accurately controlled.

[0033] The external air path is composed of a closed space formed by the outer shell 1, the fan housing top cover 2, and the base 3. The wind entering the lower electromagnetic bearing wind area 300 enters the external air path through the opening at the lower end of the base 3. The helium entering the external air path enters the cooler 12 through the external air path for cooling, and then enters the internal air path, and the cycle is repeated to form a main helium fan drive motor cooling air path system.

[0034] The present invention can achieve that under rated working conditions (7MPa helium), the temperature rise of the stator 6 and the rotor 7 are both lower than 100°C. After the cooler 12 is cut off from water for 120s, the temperature rise of the stator and rotor 7 is both lower than 100°C. Under factory working conditions (1MPa nitrogen), the temperature rise of the stator and rotor 7 is both lower than 120°C. The ventilation cooling system can ensure long-term stable operation of the motor.

[0035] Specifically, the motor stator wind zone 200 includes a first wind path, a second wind path, a third wind path and a fourth wind path. Each wind path of the motor stator wind zone 200 can guide cooling wind to each area between the stator 6, the rotor 7 and the base 3 to ensure the cooling effect.

[0036] Among them, an inner air guide groove 302 is provided between the base 3 and the stator 6, and a wind shield 301 is provided on the top of the inner air guide groove 302. The upper electromagnetic bearing wind zone 100, the wind shield 301, the inner air guide groove 302 and the lower electromagnetic bearing wind zone 300 are connected in sequence; the first wind path passes through the wind shield 301 and the inner air guide groove 302, and finally enters the lower electromagnetic bearing wind zone 300. The cooling wind passes through the first wind path, and the outer wall of the stator 6 is fully cooled. In the first wind path, there is a small gap between the wind shield 301 and the inner air guide groove 302 to limit the amount of air entering the first wind path.

[0037] The rotor 7 is provided with a rotor axial wind groove 701 and a rotor radial wind groove 702 which are interconnected, and an air gap 13 is provided between the rotor 7 and the stator 6; the second wind path passes through the rotor axial wind groove 701 and the rotor radial wind groove 702, and then enters the air gap 13 between the stator 6 and the rotor 7. The cooling wind passes through the second wind path, and the rotor axial wind groove 701, the rotor radial wind groove 702, and the air gap 13 between the stator 6 and the rotor 7 are fully cooled.

[0038] The stator 6 is provided with a stator ventilation auxiliary slot 603 on the inner side, and a stator radial wind groove 602 is provided inside the stator 6; the third wind path passes through the air gap 13 between the stator 6 and the rotor 7, the stator ventilation auxiliary slot 603, and after merging with the wind from the second wind path, enters the closed space formed by the machine base 3 and the stator core 601 through the stator radial wind groove 602, and finally enters the lower electromagnetic bearing wind area 300. The cooling wind passes through the bottom single wind path, and the inside of the stator 6 is fully cooled.

[0039] Electromagnetic end covers 16 for limiting the position of the stator 6 are provided on the upper and lower sides of the stator 6. The electromagnetic end covers 16 are fixed in the base 3. Ventilation holes are provided on the electromagnetic end covers 16 on the lower side of the stator 6. The closed space formed by the base 3 and the stator core 601, the ventilation holes and the lower electromagnetic bearing wind zone 300 are connected in sequence.

[0040] An outer air guide groove 303 is provided inside the base 3, and the upper electromagnetic bearing wind area 100, the outer air guide groove 303 and the lower auxiliary bearing wind area 400 are connected in sequence; the fourth air path passes through the outer air guide groove 303 and enters the lower auxiliary bearing wind area 400. The fourth air path does not pass through the stator 6 and the rotor 7. The cooling air passes through the fourth air path, and the base 3 is fully cooled.

[0041] In this embodiment, part of the cold air coming out of the cooler 12 enters the shaft axial hole 703 and then reaches the lower auxiliary bearing wind zone 400, and the other part enters the upper electromagnetic bearing wind zone 100 through the impeller 11. The cold air reaches the wind path of the lower auxiliary bearing wind zone 400 through the shaft axial hole 703, and the pressure head generated by the rotation of the wind duct inside the shaft 14 drives the helium to flow; the cold air enters the wind path of the upper electromagnetic bearing wind zone 100 through the impeller 11, and the pressure head generated by the rotation of the impeller 11 and the rotor 7 drives the helium to flow.

[0042] The lower electromagnetic bearing end cover 5 is provided with a connecting hole for connecting the lower electromagnetic bearing wind zone 300 and the lower auxiliary bearing wind zone 400, and the connecting hole is inclined toward the center of the rotating shaft 14 from bottom to top. The inclined connecting hole can allow cooling wind to fill every corner of the lower electromagnetic bearing wind zone 300, thereby improving the cooling effect.

[0043] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. The cooling air path of the main helium blower driving motor is characterized by: It comprises an outer shell (1) and a fan casing top cover (2) connected to the top of the outer shell (1); a base (3) is fixed inside the outer shell (1); and a rotating shaft (14) is arranged inside the base (3); The bottom of the outer shell (1) is connected with an intermediate flange (15), and a sealing member is connected between the intermediate flange (15) and the rotating shaft (14); a lower electromagnetic bearing (4) is installed at the lower part of the rotating shaft (14), and a lower electromagnetic bearing end cover (5) is connected between the lower electromagnetic bearing (4) and the machine base (3); a rotor (7) is installed on the rotating shaft (14), and a stator (6) is arranged between the rotor (7) and the machine base (3); an upper electromagnetic bearing (9) is installed at the upper part of the rotating shaft (14), and an upper electromagnetic bearing end cover (8) is connected between the upper electromagnetic bearing (9) and the machine base (3), and a motor upper cover (10) is connected to the upper side of the upper electromagnetic bearing end cover (8), and the upper electromagnetic bearing (9) is located in the motor upper cover (10); an impeller (11) is connected to the upper end of the rotating shaft (14), and a cooler (12) is connected to the upper side of the motor upper cover (10), and the cooler (12) is located above the impeller (11); The space between the upper electromagnetic bearing (9), the impeller (11), the motor upper cover (10) and the upper electromagnetic bearing end cover (8) is the upper electromagnetic bearing wind zone (100); the space between the upper electromagnetic bearing end cover (8), the upper side of the stator (6) and the rotor (7), the rotating shaft (14) and the machine base (3) is the motor stator wind zone (200); the space between the lower electromagnetic bearing end cover (5), the lower side of the stator (6) and the rotor (7), the rotating shaft (14) and the machine base (3) is the lower electromagnetic bearing wind zone (300); the space between the intermediate flange (15), the lower electromagnetic bearing end cover (5) and the machine base (3) is the lower auxiliary bearing wind zone (40 0), the cooler (12), the upper electromagnetic bearing wind zone (100), the motor stator wind zone (200), the lower electromagnetic bearing wind zone (300) and the lower auxiliary bearing wind zone (400) are connected in sequence; the space between the outer shell (1), the fan housing top cover (2) and the machine base (3) is an external wind path, the upper opening of the cooler (12) is connected to the external wind path, and the lower electromagnetic bearing wind zone (300) is connected to the external wind path; the rotating shaft (14) is provided with a rotating shaft axial hole (703), the upper part of the rotating shaft axial hole (703) is through, and the lower part of the rotating shaft axial hole (703) is connected to the lower auxiliary bearing wind zone (400).

2. The main helium blower drive motor cooling air duct according to claim 1, characterized in that: The motor stator wind zone (200) comprises a first wind path, a second wind path, a third wind path and a fourth wind path.

3. The main helium blower drive motor cooling air duct according to claim 2, characterized in that: An inner air guide groove (302) is arranged between the machine base (3) and the stator (6); a wind shield (301) is arranged on the top of the inner air guide groove (302); the upper electromagnetic bearing wind zone (100), the wind shield (301), the inner air guide groove (302) and the lower electromagnetic bearing wind zone (300) are connected in sequence; the first air path passes through the wind shield (301) and the inner air guide groove (302) and finally enters the lower electromagnetic bearing wind zone (300).

4. The main helium blower drive motor cooling air duct according to claim 2, characterized in that: The rotor (7) is provided with a rotor axial wind groove (701) and a rotor radial wind groove (702) which are interconnected, and an air gap (13) is provided between the rotor (7) and the stator (6); the second wind path passes through the rotor axial wind groove (701) and the rotor radial wind groove (702), and then enters the air gap (13) between the stator (6) and the rotor (7).

5. The main helium blower drive motor cooling air duct according to claim 3, characterized in that: A stator ventilation sub-slot (603) is arranged on the inner side of the stator (6), and a stator radial wind groove (602) is arranged inside the stator (6); the third wind path passes through the air gap (13) between the stator (6) and the rotor (7), the stator ventilation sub-slot (603), and after merging with the wind from the second wind path, enters the closed space formed by the machine base (3) and the stator core (601) through the stator radial wind groove (602), and finally enters the lower electromagnetic bearing wind zone (300).

6. The main helium blower drive motor cooling air duct according to claim 5, characterized in that: Electromagnetic end covers (16) for limiting the position of the stator (6) are arranged on both the upper and lower sides of the stator (6); the electromagnetic end covers (16) are fixed in the machine base (3); ventilation holes are provided on the electromagnetic end covers (16) on the lower side of the stator (6); and the closed space formed by the machine base (3) and the stator core (601), the ventilation holes and the lower electromagnetic bearing wind zone (300) are connected in sequence.

7. The main helium blower drive motor cooling air duct according to claim 2, characterized in that: An outer air guide groove (303) is provided on the inner side of the machine base (3); the upper electromagnetic bearing wind zone (100), the outer air guide groove (303) and the lower auxiliary bearing wind zone (400) are connected in sequence; and the fourth air path passes through the outer air guide groove (303) and enters the lower auxiliary bearing wind zone (400).

8. The main helium blower drive motor cooling air duct according to claim 1, characterized in that: A portion of the cold air coming out of the cooler (12) enters the axial hole (703) of the rotating shaft and then reaches the lower auxiliary bearing wind zone (400), and another portion enters the upper electromagnetic bearing wind zone (100) through the impeller (11).

9. The main helium blower drive motor cooling air duct according to claim 8, characterized in that: The helium gas reaches the wind path of the lower auxiliary bearing wind zone (400) through the axial hole (703) of the rotating shaft, and the pressure head generated by the rotation of the wind duct inside the rotating shaft (14) drives the helium gas to flow; the helium gas enters the wind path of the upper electromagnetic bearing wind zone (100) through the impeller (11), and the pressure head generated by the rotation of the impeller (11) and the rotor (7) drives the helium gas to flow.

10. The main helium blower drive motor cooling air duct according to any one of claims 1 to 9, characterized in that: The lower electromagnetic bearing end cover (5) is provided with a connecting hole for connecting the lower electromagnetic bearing air zone (300) and the lower auxiliary bearing air zone (400), and the connecting hole is inclined toward the center of the rotating shaft (14) from bottom to top.

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