Primary helium fan of high-temperature gas cooled reactor

Abstract

The invention belongs to the technical field of helium fans, and particularly relates to a main helium fan of a high-temperature gas cooled reactor. The main helium fan comprises a shell, a rotating shaft is arranged in the shell, a middle flange is connected in the shell, a labyrinth sealing device is connected between the middle flange and the rotating shaft, and an inner cavity of the shell is divided into a motor cavity and a working cavity by the middle flange; the end, extending out of the working cavity, of the rotating shaft is connected with a main impeller, a machine base is fixed in a motor cavity of the shell, a lower radial electromagnetic bearing and an auxiliary bearing are connected between a lower bearing end cover and the rotating shaft, and an auxiliary bearing, a thrust electromagnetic bearing and an upper radial electromagnetic bearing are connected between an upper bearing end cover and the rotating shaft. A stator is arranged between the rotor and the base, an axial flow fan is installed at the top of the rotating shaft, a helium water cooler is installed at the upper end of the motor upper cover, and the axial flow fan is located on the lower side of the helium water cooler. According to the high-temperature gas cooled reactor primary helium fan, the motor cavity and the working cavity are effectively isolated, and the temperature rise of the motor cavity is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of helium blowers, and in particular relates to a main helium blower for a high-temperature gas-cooled reactor. Background Art

[0002] The high temperature gas-cooled reactor nuclear power unit is an advanced reactor type with the characteristics of the fourth generation of nuclear power technology and is one of the main reactor types in the development of nuclear power today. The main helium blower is the helium circulation blower in the coolant system of the high temperature gas-cooled reactor. Under various operating conditions of reactor startup, operation and shutdown, the main helium blower drives a sufficient flow of coolant to circulate in the primary circuit. The coolant flows through the reactor core, taking away the heat; then the heat is transferred to the water in the secondary circuit, turning the water into steam, which drives the steam turbine generator to rotate and generate electricity. The cooled coolant is then compressed by the main helium blower and returned to the core to continue circulating. The main helium blower is a vertical single-stage centrifugal blower located inside the pressure vessel at the top of the steam generator, and its surrounding working environment is a primary circuit medium. The impeller is cantilevered and installed at the end of the drive motor shaft. The shaft penetration must prevent the 250°C helium in the lower fan chamber from flowing directly into the motor chamber. The main helium blower is installed in a 7MPa primary circuit coolant pressure chamber. The working chamber is connected to the chamber where the drive motor is located. The working temperature difference between the two chambers is very large, requiring electrical components and mechanical parts to pass through the pressure boundary and be supported by electromagnetic bearings. Sealing is very difficult. The current dynamic sealing technology cannot meet the negative change rate requirements of the primary circuit helium pressure of the high-temperature reactor.

[0003] The high temperature and high pressure (250℃, 7MPa) helium in the working chamber continuously inputs heat into the chamber where the drive motor is located through working fluid exchange, convection, heat conduction, radiation, etc. At the same time, the heat generated by the drive motor and electromagnetic bearing during the operation of the main helium blower is relatively large, and the primary circuit hot helium continuously inputs heat into the motor chamber through heat conduction and heat radiation, which may cause overheating and damage to the electrical equipment in the motor chamber of the main helium blower. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the object of the present invention is to provide a main helium blower for a high temperature gas-cooled reactor which can effectively isolate a motor cavity from a working cavity and reduce the temperature rise of the motor cavity.

[0005] The technical solution adopted by the present invention is: The main helium blower of a high temperature gas-cooled reactor comprises a shell, a rotating shaft is arranged in the shell, an intermediate flange is connected in the shell, a labyrinth sealing device is connected between the intermediate flange and the rotating shaft, and the intermediate flange divides the inner cavity of the shell into a motor cavity and a working cavity; one end of the rotating shaft extending out of the working cavity is connected with a main impeller, a base is fixed in the motor cavity of the shell, a lower bearing end cover and an upper bearing end cover are fixed in the base, a lower radial electromagnetic bearing and an auxiliary bearing are connected between the lower bearing end cover and the rotating shaft, an auxiliary bearing, a thrust electromagnetic bearing and an upper radial electromagnetic bearing are connected between the upper bearing end cover and the rotating shaft, a rotor is fixed on the rotating shaft, the rotor is located between the lower radial electromagnetic bearing and the upper radial electromagnetic bearing, a stator is arranged between the rotor and the base, an axial flow blower is installed on the top of the rotating shaft, a motor upper cover is connected to the upper end of the base, a helium water cooler is installed on the upper end of the motor upper cover, and the axial flow blower is located on the lower side of the helium water cooler.

[0006] The main helium blower of the high-temperature gas-cooled reactor is a large, vertical, high-speed variable frequency unit. It adopts a large number of innovative technologies, breaking through the speed range and structural type of existing large vertical units. It is the first reactor equipment in the world to use electromagnetic suspension bearings. The main helium blower is a vertical single-stage centrifugal blower located inside the pressure vessel at the top of the steam generator, and its surrounding working environment is a primary circuit medium. The cantilever of the main impeller is installed at the end of the drive motor shaft, and a labyrinth seal is provided at the shaft penetration to prevent the 250℃ helium in the lower fan chamber from flowing directly into the motor chamber. The main helium blower is installed in the 7MPa primary circuit coolant pressure chamber. The working chamber is connected to the motor chamber. The working temperature difference between the two chambers is very large, requiring electrical components and mechanical parts to pass through the pressure boundary, supported by electromagnetic bearings, and the labyrinth seal can meet the negative change rate requirements of the primary circuit helium pressure of the high-temperature reactor.

[0007] Since it is very difficult to seal helium, the current dynamic sealing technology cannot meet the requirements of the helium pressure change rate of the first circuit of the high-temperature reactor. The main helium fan adopts a unique built-in layout. The main helium fan is installed inside the pressure vessel at the top of the steam generator, and the working chamber and the motor chamber are connected through a labyrinth sealing device provided at the through-shaft. A helium-water cooler is installed in the steam generator chamber above the main helium fan drive motor, and the cooling of the electrical equipment in the main helium fan motor chamber is achieved by circulating helium in the motor chamber. When the motor rotates, the auxiliary impeller installed on the top of the motor allows the helium to flow through the electrical equipment, and then flows through the cooler installed on the end cover of the fan housing, and the heat is taken away by the cooling water flowing through the cooler. The present invention continuously cools the helium medium and electrical equipment in the motor chamber of the main helium fan to avoid over-temperature damage to the electrical equipment in the motor chamber of the main helium fan.

[0008] As a preferred embodiment of the present invention, the space between the upper bearing end cover, the axial flow fan and the upper cover of the motor is the upper bearing wind zone, the space between the upper 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 bearing end cover, the lower side of the stator and the rotor, the rotating shaft and the machine base is the lower bearing wind zone, the space between the intermediate flange, the lower electromagnetic bearing end cover and the machine base is the lower auxiliary bearing wind zone, the helium water cooler, the upper bearing wind zone, the motor stator wind zone, the lower bearing wind zone and the lower auxiliary bearing wind zone are connected in sequence; the space between the shell and the machine base is the external wind path, the upper opening of the helium water cooler is connected to the external wind path, and the lower bearing wind zone is connected to the external wind path. The helium cooled by the helium water cooler flows through the upper bearing wind zone, the motor stator wind zone, the lower bearing wind zone and the lower auxiliary bearing wind zone, and then returns to the helium water cooler through the external wind path, the helium water cooler cools the helium, and the helium cools the electrical equipment in the motor cavity of the main helium fan.

[0009] As a preferred embodiment of the present invention, a fan baffle is provided in the air inlet channel of the main impeller, a fan baffle driving device is installed in the motor cavity, the output end of the fan baffle driving device is connected to a transmission device, and the output end of the transmission device is connected to the fan baffle. Under various operating conditions of reactor startup, operation and shutdown, the main helium fan drives a sufficient flow of coolant to circulate in the first circuit. The coolant flows through the reactor core, taking away heat; then the heat is transferred to the water in the second circuit, so that the water is converted into steam, and the steam drives the steam turbine generator to rotate and generate electricity. The cooled coolant is then compressed by the main helium fan and returned to the core to continue circulating. A fan baffle is provided in the channel of the main helium fan air inlet for primary circuit isolation. The fan baffle driving device is installed in the motor cavity, and the motor cavity is cooled by helium circulation to reduce the temperature rise of the fan baffle driving device.

[0010] As a preferred solution of the present invention, the transmission device includes a first transmission rod, the first transmission rod is connected to the output end of the fan baffle driving device, the first transmission rod is connected to the second transmission rod through a bevel gear transmission, the second transmission rod is connected to a connecting rod, and the other end of the connecting rod is connected to the fan baffle. The fan baffle driving device drives the first transmission rod to rotate, the first transmission rod drives the second transmission rod to rotate through a bevel gear transmission, the second transmission rod rotates and drives the connecting rod to rotate, and the connecting rod drives the fan baffle to tilt, so that the fan baffle can open and close a circuit.

[0011] As a preferred solution of the present invention, a heat insulation layer is arranged in the housing and distributed along the circumference in the housing. The heat insulation layer isolates high-temperature helium and plays a role in protecting the upper radial electromagnetic bearing, auxiliary bearing and lower radial electromagnetic bearing in the motor cavity.

[0012] As a preferred solution of the present invention, the stator includes a stator core, a thrust surface for limiting the axial position of the stator core is arranged in the base, and the end surface of the stator core contacts the thrust surface.

[0013] As a preferred solution of the present invention, the stator includes a stator core, the inner wall of the base is provided with a waist-circular closed groove, the waist-circular closed groove is provided with a guide key for limiting the radial position of the stator core, and the guide key cooperates with the side wall of the stator core.

[0014] As a preferred solution of the present invention, the rotor includes a rotor core, a stop plane is provided on the rotating shaft, and the inner wall of the rotor core cooperates with the stop plane.

[0015] As a preferred solution of the present invention, the stator is positioned by inner circle, and after the stator is pre-pressed in sections, it is connected to the base as a whole by means of shrink fitting.

[0016] As a preferred solution of the present invention, the rotor is positioned by inner circle, and the rotor is formed by stacking multiple thin silicon steel sheets and connected to the rotating shaft by means of shrink sleeve.

[0017] The beneficial effects of the present invention are: 1. The cantilever of the main impeller of the present invention is installed at the end of the drive motor shaft, and a labyrinth seal is provided at the shaft penetration to prevent the 250°C helium in the lower fan chamber from directly flowing into the motor chamber. The main helium fan is installed in the 7MPa primary circuit coolant pressure chamber, and the working chamber is connected to the motor chamber. The working temperature difference between the two chambers is large, requiring electrical components and mechanical parts to penetrate the pressure boundary, supported by electromagnetic bearings, and the labyrinth seal can meet the negative change rate requirements of the primary circuit helium pressure of the high temperature reactor.

[0018] 2. The main helium fan is installed inside the pressure vessel at the top of the steam generator. The working chamber and the motor chamber are connected through a labyrinth sealing device provided at the through-shaft to reduce the impact of the high temperature of the working chamber on the motor chamber. A helium-water cooler is installed in the steam generator chamber above the main helium fan drive motor. The cooling of the electrical equipment in the motor chamber of the main helium fan is achieved by circulating helium in the motor chamber. When the motor rotates, the auxiliary impeller installed on the top of the motor allows the helium to flow through the electrical equipment, and then flows through the cooler installed on the end cover of the fan housing, and the heat is taken away by the cooling water flowing through the cooler. The present invention continuously cools the helium medium and electrical equipment in the motor chamber of the main helium fan to avoid over-temperature damage to the electrical equipment in the motor chamber of the main helium fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the structure of the stator and the base; Figure 3 It is a schematic diagram of the structure of the rotor and the shaft; Figure 4 yes Figure 3 Cross-sectional view at AA in the middle.

[0020] In the figure: 1-fan baffle; 2-main impeller; 3-upper radial electromagnetic bearing; 4-lower radial electromagnetic bearing; 5-auxiliary bearing; 6-middle flange; 7-fan baffle drive device; 8-insulation layer; 9-housing; 10-stator; 11-rotor; 12-thrust electromagnetic bearing; 13-axial flow fan; 14-helium water cooler; 15-labyrinth sealing device; 16-lower bearing end cover; 17-upper bearing end cover; 18-motor upper cover; 19-transmission device; 101-machine base; 102-stator core; 103-thrust surface; 104-guide key; 110-rotor core; 111-rotating shaft; 112-stop plane; 191-first transmission rod; 192-second transmission rod; 193-connecting rod. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] like Figure 1 to Figure 4As shown, the main helium blower of the high temperature gas-cooled reactor of this embodiment comprises a housing 9, a rotating shaft 111 is arranged in the housing 9, an intermediate flange 6 is connected in the housing 9, a labyrinth sealing device 15 is connected between the intermediate flange 6 and the rotating shaft 111, and the intermediate flange 6 divides the inner cavity of the housing 9 into a motor cavity and a working cavity; the end of the rotating shaft 111 extending out of the working cavity is connected to the main impeller 2, a base 101 is fixed in the motor cavity of the housing 9, a lower bearing end cover 16 and an upper bearing end cover 17 are fixed in the base 101, and a lower radial electric A magnetic bearing 4 and an auxiliary bearing 5, an auxiliary bearing 5, a thrust electromagnetic bearing 12 and an upper radial electromagnetic bearing 3 are connected between the upper bearing end cover 17 and the rotating shaft 111, a rotor 11 is fixed on the rotating shaft 111, the rotor 11 is located between the lower radial electromagnetic bearing 4 and the upper radial electromagnetic bearing 3, a stator 10 is arranged between the rotor 11 and the machine base 101, an axial flow fan 13 is installed on the top of the rotating shaft 111, a motor upper cover 18 is connected to the upper end of the machine base 101, a helium water cooler 14 is installed on the upper end of the motor upper cover 18, and the axial flow fan 13 is located on the lower side of the helium water cooler 14.

[0024] The main helium blower of the high-temperature gas-cooled reactor is a large, vertical, high-speed variable frequency unit. It adopts a large number of innovative technologies, breaking through the speed range and structural type of existing large vertical units. It is the first reactor equipment in the world to use electromagnetic suspension bearings. The main helium blower is a vertical single-stage centrifugal blower, located inside the pressure vessel at the top of the steam generator, and its surrounding working environment is a primary circuit medium. The cantilever of the main impeller 2 is installed at the end of the drive motor shaft, and a labyrinth seal device 15 is provided at the shaft penetration to prevent the 250°C helium in the lower fan chamber from directly flowing into the motor chamber. The main helium blower is installed in a 7MPa primary circuit coolant pressure chamber, and the working chamber is connected to the motor chamber. The working temperature difference between the two chambers is very large, requiring electrical components and mechanical parts to pass through the pressure boundary, supported by electromagnetic bearings, and the labyrinth seal device 15 can meet the negative change rate requirements of the primary circuit helium pressure of the high-temperature reactor.

[0025] Since it is very difficult to seal helium, the current dynamic sealing technology cannot meet the requirements of the helium pressure change rate of the first circuit of the high-temperature reactor, and the main helium fan adopts a unique built-in layout. The main helium fan is installed inside the pressure vessel at the top of the steam generator, and the working chamber and the motor chamber are connected through a labyrinth sealing device 15 provided at the through-shaft. A helium-water cooler 14 is installed in the steam generator chamber above the main helium fan drive motor, and the cooling of the electrical equipment in the main helium fan motor chamber is achieved by circulating helium in the motor chamber. When the motor rotates, the auxiliary impeller installed on the top of the motor allows the helium to flow through the electrical equipment, and then flows through the cooler installed on the end cover of the fan housing 9, and the heat is taken away by the cooling water flowing through the cooler. The present invention continuously cools the helium medium and electrical equipment in the motor chamber of the main helium fan to avoid over-temperature damage to the electrical equipment in the motor chamber of the main helium fan.

[0026] Among them, the space between the upper bearing end cover 17, the axial flow fan 13 and the motor upper cover 18 is the upper bearing wind zone, the space between the upper bearing end cover 17, the upper side of the stator 10 and the rotor 11, the rotating shaft 111 and the machine base 101 is the motor stator wind zone, the space between the lower bearing end cover 16, the lower side of the stator 10 and the rotor 11, the rotating shaft 111 and the machine base 101 is the lower bearing wind zone, the space between the middle flange 6, the lower electromagnetic bearing end cover and the machine base 101 is the lower auxiliary bearing wind zone, the helium water cooler 14, the upper bearing wind zone, the motor stator wind zone, the lower bearing wind zone and the lower auxiliary bearing wind zone are connected in sequence; the space between the shell 9 and the machine base 101 is the external wind path, the upper opening of the helium water cooler 14 is connected to the external wind path, and the lower bearing wind zone is connected to the external wind path. The helium cooled by the helium water cooler 14 flows through the upper bearing wind area, the motor stator wind area, the lower bearing wind area and the lower auxiliary bearing wind area, and then returns to the helium water cooler 14 through the external wind path. The helium water cooler 14 cools the helium, and the helium cools the electrical equipment in the main helium fan motor cavity.

[0027] Furthermore, a fan baffle 1 is provided in the air inlet channel of the main impeller 2, a fan baffle driving device 7 is installed in the motor cavity, the output end of the fan baffle driving device 7 is connected to a transmission device 19, and the output end of the transmission device 19 is connected to the fan baffle 1. Under various operating conditions of reactor startup, operation and shutdown, the main helium fan drives a sufficient flow of coolant to circulate in the primary circuit. The coolant flows through the reactor core and takes away the heat; then the heat is transferred to the water in the secondary circuit, so that the water is converted into steam, and the steam drives the steam turbine generator to rotate and generate electricity. The cooled coolant is then compressed by the main helium fan and returns to the core to continue circulating. A fan baffle 1 is provided in the channel of the main helium fan air inlet for primary circuit isolation. The fan baffle driving device 7 is installed in the motor cavity, and the motor cavity is cooled by helium circulation to reduce the temperature rise of the fan baffle driving device 7.

[0028] The transmission device 19 includes a first transmission rod 191, which is connected to the output end of the fan baffle driving device 7. The first transmission rod 191 is connected to the second transmission rod 192 through a bevel gear transmission, and the second transmission rod 192 is connected to a connecting rod 193, and the other end of the connecting rod 193 is connected to the fan baffle 1. The fan baffle driving device 7 drives the first transmission rod 191 to rotate, and the first transmission rod 191 drives the second transmission rod 192 to rotate through a bevel gear transmission. When the second transmission rod 192 rotates, it drives the connecting rod 193 to rotate, and the connecting rod 193 drives the fan baffle 1 to tilt, so that the fan baffle 1 can open and close a circuit.

[0029] In order to further improve the heat insulation effect, a heat insulation layer 8 is provided in the housing 9, and the heat insulation layer 8 is distributed along the circumference in the housing 9. The heat insulation layer 8 isolates the high-temperature helium and plays a role in protecting the upper radial electromagnetic bearing 3, the auxiliary bearing 5 and the lower radial electromagnetic bearing 4 in the motor cavity.

[0030] In order to ensure that the stator 10 and the rotor 11 are reliably installed, a thrust surface 103 is provided in the base 101 for limiting the axial position of the stator core 102, and the end face of the stator core 102 contacts the thrust surface 103. A waist-shaped closed groove is provided on the inner wall of the base 101, and a guide key 104 is provided in the waist-shaped closed groove for limiting the radial position of the stator core 102, and the guide key 104 cooperates with the side wall of the stator core 102. A stop plane 112 is provided on the rotating shaft 111, and the inner wall of the rotor core 110 cooperates with the stop plane 112.

[0031] The stator 10 is positioned by inner circle, and after being pre-pressed in sections, it is connected to the base 101 as a whole by shrinkage or the like. The rotor 11 is positioned by inner circle, and the rotor 11 is formed by stacking multiple thin silicon steel sheets, and is connected to the rotating shaft 111 by shrinkage or the like.

[0032] 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. Main helium blower for high temperature gas-cooled reactor, characterized by: The invention comprises a housing (9), a rotating shaft (111) is arranged in the housing (9), an intermediate flange (6) is connected in the housing (9), a labyrinth sealing device (15) is connected between the intermediate flange (6) and the rotating shaft (111), and the intermediate flange (6) divides the inner cavity of the housing (9) into a motor cavity and a working cavity; one end of the rotating shaft (111) extending out of the working cavity is connected to a main impeller (2), a base (101) is fixed in the motor cavity of the housing (9), a lower bearing end cover (16) and an upper bearing end cover (17) are fixed in the base (101), and a lower radial electromagnetic bearing (4) and an auxiliary bearing (5) are connected between the lower bearing end cover (16) and the rotating shaft (111). ), an auxiliary bearing (5), a thrust electromagnetic bearing (12) and an upper radial electromagnetic bearing (3) are connected between the upper bearing end cover (17) and the rotating shaft (111), a rotor (11) is fixed on the rotating shaft (111), the rotor (11) is located between the lower radial electromagnetic bearing (4) and the upper radial electromagnetic bearing (3), a stator (10) is arranged between the rotor (11) and the machine base (101), an axial flow fan (13) is installed on the top of the rotating shaft (111), a motor upper cover (18) is connected to the upper end of the machine base (101), a helium water cooler (14) is installed on the upper end of the motor upper cover (18), and the axial flow fan (13) is located on the lower side of the helium water cooler (14).

2. The main helium blower for a high temperature gas-cooled reactor according to claim 1, characterized in that: The space between the upper bearing end cover (17), the axial flow fan (13) and the motor upper cover (18) is the upper bearing wind zone; the space between the upper bearing end cover (17), the upper sides of the stator (10) and the rotor (11), the rotating shaft (111) and the machine base (101) is the motor stator wind zone; the space between the lower bearing end cover (16), the lower sides of the stator (10) and the rotor (11), the rotating shaft (111) and the machine base (101) is the lower bearing wind zone; the space between the intermediate flange (6), the lower electromagnetic bearing end cover and the machine base (101) is the lower auxiliary bearing wind zone; the helium water cooler (14), the upper bearing wind zone, the motor stator wind zone, the lower bearing wind zone and the lower auxiliary bearing wind zone are connected in sequence; the space between the housing (9) and the machine base (101) is the external wind path; the upper opening of the helium water cooler (14) is connected to the external wind path; and the lower bearing wind zone is connected to the external wind path.

3. The main helium blower for a high temperature gas-cooled reactor according to claim 1, characterized in that: A fan baffle (1) is arranged in the air inlet channel of the main impeller (2), a fan baffle driving device (7) is installed in the motor cavity, the output end of the fan baffle driving device (7) is connected to a transmission device (19), and the output end of the transmission device (19) is connected to the fan baffle (1).

4. The main helium blower for a high temperature gas-cooled reactor according to claim 3, characterized in that: The transmission device (19) comprises a first transmission rod (191), the first transmission rod (191) being connected to the output end of the fan baffle driving device (7), the first transmission rod (191) being connected to a second transmission rod (192) via a bevel gear transmission, the second transmission rod (192) being connected to a connecting rod (193), the other end of the connecting rod (193) being connected to the fan baffle (1).

5. The main helium blower for a high temperature gas-cooled reactor according to claim 1, characterized in that: A heat insulation layer (8) is arranged in the shell (9), and the heat insulation layer (8) is distributed along the circumference in the shell (9).

6. The main helium blower for a high temperature gas-cooled reactor according to claim 1, characterized in that: The stator (10) comprises a stator core (102); a thrust surface (103) for limiting the axial position of the stator core (102) is arranged in the machine base (101); and an end surface of the stator core (102) is in contact with the thrust surface (103).

7. The main helium blower for a high temperature gas-cooled reactor according to claim 1, characterized in that: The stator (10) comprises a stator core (102), the inner wall of the machine base (101) is provided with a waist-shaped closed groove, a guide key (104) for limiting the radial position of the stator core (102) is provided in the waist-shaped closed groove, and the guide key (104) cooperates with the side wall of the stator core (102).

8. The main helium blower for a high temperature gas-cooled reactor according to claim 1, characterized in that: The rotor (11) comprises a rotor core (110); a stop plane (112) is provided on the rotating shaft (111); and an inner wall of the rotor core (110) cooperates with the stop plane (112).

9. The main helium blower for a high temperature gas-cooled reactor according to claim 1, characterized in that: The stator (10) is positioned by inner circle, and after being pre-pressed in sections, the stator (10) is connected to the machine base (101) as a whole by means of shrink fitting.

10. The main helium blower for a high temperature gas-cooled reactor according to claim 1, characterized in that: The rotor (11) is positioned by inner circle, and is formed by stacking a plurality of thin silicon steel sheets, and is connected to the rotating shaft (111) by means of shrink sleeve.

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