A type of asymmetric axial partitioned cooling air path for hydro generator

Abstract

This invention relates to the field of hydro-generator cooling technology, specifically to an asymmetric axially partitioned cooling airflow path for a hydro-generator. It includes: a rotor pole baffle disposed on the side of the magnetic pole near the stator core; the rotor pole baffle having a plurality of air holes; the rotor pole baffle being adapted to block airflow from the stator core toward the magnetic pole; and the air holes being adapted to allow airflow to enter the stator core from the magnetic pole; the air holes are positioned so that the airflow entering the stator core from the air holes does not clash with existing airflow in the stator core. This application reduces airflow convergence, thus avoiding energy loss. A deflection loop is formed within the stator core and stator frame, increasing the utilization rate of the cooling airflow.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator cooling technology, specifically to an asymmetric axially partitioned hydro-generator cooling airflow path. Background Technology

[0002] In existing evaporative-cooled hydro turbine generator sets, the stator windings are cooled by evaporation, while the rotor and stator core are cooled by air. For example... Figure 1 As shown, when the rotor and stator core are cooled by air, the conventional air path is either pure radial ventilation or axial-radial mixing with magnetic yoke fans arranged at the upper and lower ends of the magnetic yoke. Moreover, it is mostly a symmetrical air path. When the air paths converge, the airflow in the symmetrical air path will form a countercurrent, resulting in unnecessary energy loss. Summary of the Invention

[0003] In view of this, the present invention provides an asymmetric axial partitioned cooling air path for a hydro-generator to solve the problems of low cooling airflow utilization and inability to meet heat dissipation requirements in existing cooling air paths of specific motors.

[0004] This invention provides an asymmetric axially partitioned cooling airflow path for a hydro-generator, disposed within the hydro-generator. The hydro-generator includes a motor shaft and a foundation pit surrounding the motor shaft. Within the foundation pit, at least a rotor support, a rotor yoke, magnetic poles, a stator core, and a stator base are disposed radially along the motor shaft. The system includes:

[0005] A partitioned windshield is disposed on the side of the stator frame away from the motor shaft. The partitioned windshield has an opening facing the stator frame. The bottom end of the partitioned windshield is lower than the bottom end of the stator frame. The partitioned windshield is divided into several windshield sub-areas.

[0006] The stator base is divided into several base sub-areas, and the base sub-areas are correspondingly arranged with the windshield area, so that the airflow flows between the base sub-areas and the windshield area;

[0007] A rotor pole baffle is provided on the side of the magnetic pole near the stator core, and a number of air holes are provided on the rotor pole baffle.

[0008] The rotor inter-pole baffle is adapted to block the airflow towards the magnetic pole inside the stator core, and the air vent is adapted to allow the airflow to enter the stator core from the magnetic pole;

[0009] The airflow entering the stator core from the air vents does not clash with the existing airflow in the stator core.

[0010] In this application, the airflow, driven by the rotor pressure head, flows from the rotor support to the stator frame, and then flows through the air vents to the partitioned wind deflector. Under the obstruction of the partitioned wind deflector, the airflow flows from the stator frame to the stator core, and then, under the obstruction of the rotor inter-pole baffles, it forms a deflection within the stator core and stator frame, creating a baffle loop within them. Finally, the airflow exits the partitioned wind deflector from below the stator frame towards the rotor support. This application reduces airflow convergence, thus avoiding energy loss. The baffle loop formed within the stator core and stator frame increases the utilization rate of the cooling airflow.

[0011] In one alternative embodiment, the lowest-positioned windshield area corresponds to both the lowest-positioned base sub-area and the space below the stator base, while the windshield areas above the lowest position correspond to two adjacent base sub-areas. This allows the gas flow directions between two adjacent base sub-areas to be reversed, increasing the utilization rate of the airflow used for cooling.

[0012] In one optional embodiment, a rotor pole baffle is provided on the side of the magnetic pole near the stator core. The rotor pole baffle is axially disposed between two adjacent magnetic poles, and a plurality of air holes are provided on the rotor pole baffle.

[0013] The rotor inter-pole baffle is adapted to block the airflow towards the magnetic pole within the stator core. The air vents of the rotor inter-pole baffle are adapted to allow airflow entering the stator core from the magnetic pole to pass through, ensuring that the airflow entering the stator core from the air vents does not clash with the airflow within the stator core. This creates a flow deflection between the stator core and the stator frame.

[0014] In one optional embodiment, an upper fan is provided on the upper end side of the rotor yoke, and a lower fan is provided on the lower end side of the rotor yoke. The upper and lower fans can respectively accelerate the airflow from the rotor support to the stator frame on the upper and lower ends of the rotor yoke.

[0015] In one optional embodiment, a lower baffle is provided at the lower end of the magnetic pole. The lower baffle is adapted to allow airflow from the lower end of the rotor yoke toward the magnetic pole to enter the magnetic pole at an upward angle. The lower baffle allows the airflow to cool the ends of the magnetic pole windings located outside the magnetic pole and gives the airflow an axial component, thereby increasing the airflow above the magnetic pole.

[0016] In one alternative embodiment, a condenser is provided on the upper end side of the stator frame, the condenser being adapted to cool the stator windings.

[0017] In one optional embodiment, an air cooler is provided on one end of the stator frame near the partitioned wind baffle, and the air cooler is located inside the partitioned wind baffle. The airflow flowing from the stator frame towards the partitioned wind baffle can be cooled by the air cooler, and then form a deflection on the stator core, enhancing the cooling effect.

[0018] In one alternative embodiment, the condenser is disposed on the stator frame at one end away from the motor shaft. The condenser can obstruct airflow above the stator frame, causing it to flow downwards.

[0019] In one optional embodiment, a through hole is provided at the top of the stator frame, the through hole being located between the stator core and the condenser. The through hole allows airflow blocked by the condenser to flow into the stator frame.

[0020] In one alternative implementation, the air cooler and condenser share a single water system, which reduces piping requirements. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the existing technology structure;

[0023] Figure 2 This is a schematic diagram of the structure of an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the air vent location in an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Motor shaft; 2. Rotor support; 3. Foundation pit; 4. Rotor yoke; 5. Magnetic pole; 6. Stator core; 7. Stator frame; 8. Zoned wind deflector; 9. Radial wind deflector; 10. Radial spokes; 11. Rotor pole baffle; 12. Air vent; 13. Upper fan; 14. Lower fan; 15. Lower baffle; 16. Condenser; 17. Air cooler; 18. Through hole; 19. Magnetic pole winding. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In existing evaporative-cooled hydro turbine generator sets, the stator windings are cooled by evaporation, while the rotor and stator core are cooled by air. For example... Figure 1 As shown, the motor contains both air cooler and condenser water circuits, resulting in complex piping connections that hinder maintenance. To reduce piping connections, some studies have proposed an integrated condenser-cooler structure, where the condenser and air cooler share a single water circuit. To ensure the evaporative cooling cycle power, the condenser is typically placed high up, obstructing the original airflow path. This reduces the airflow in the original path, failing to meet the motor's cooling requirements.

[0029] For large-capacity evaporative cooling turbine generators, the current of the bus ring is relatively high. Conventional airflow is either pure radial ventilation or a combination of axial and radial ventilation with magnetic fans arranged at the upper and lower ends of the magnetic yoke. Moreover, these are mostly symmetrical airflow paths. The cooling airflow to the bus ring accounts for only 50% of the total airflow, which cannot meet the heat dissipation requirements of the bus ring.

[0030] The existing ventilation structure in generators is not suitable for situations where the upper end of the stator frame is blocked.

[0031] The following is combined with Figures 1 to 3 The following describes embodiments of the present invention.

[0032] According to an embodiment of the present invention, an asymmetric axially partitioned cooling air path for a hydro-generator is provided, disposed within the hydro-generator. The hydro-generator includes a motor shaft 1 and a foundation pit 3 arranged around the motor shaft 1. At least a rotor support 2, magnetic poles 5, a stator core 6, and a stator frame 7 are disposed within the foundation pit 3 along the radial direction of the motor shaft 1, comprising:

[0033] A partitioned windbreak 8 is disposed on the side of the stator frame 7 away from the motor shaft 1. The partitioned windbreak 8 has an opening facing the stator frame 7. The bottom end of the partitioned windbreak 8 is lower than the bottom end of the stator frame 7, and there is a gap between the bottom end of the partitioned windbreak 8 and the bottom end of the stator frame 7, allowing airflow to flow out from the bottom end of the stator frame 7. The partitioned windbreak 8 is divided into several windbreak sub-sections. It should be noted that, except for the bottom position, the partitioned windbreak 8 should be sealed to the stator frame 7 to prevent airflow from flowing out from the top or left and right sides.

[0034] The stator frame 7 is divided into several frame sub-areas, and the frame sub-areas are correspondingly arranged with the windshield area, so that the airflow flows between the frame sub-areas and the windshield area;

[0035] Specifically, the inner side of the partitioned windbreak 8 may be provided with several radial windbreak plates 9. The stator base 7 is provided with several radial spokes 10; the radial windbreak plates 9 are adapted to divide the partitioned windbreak 8 into several windbreak sub-areas, and the radial spokes 10 are adapted to divide the stator base 7 into several base sub-areas. The surfaces of the radial windbreak plates 9 and radial spokes 10 can be considered perpendicular to the motor shaft, such as... Figure 2 As shown, the radial baffle 9 and radial spokes 10 are horizontally arranged. The stator base 7 can be considered as being composed of spokes.

[0036] A rotor pole baffle 11 is provided on the side of the magnetic pole 5 near the stator core 6, and a plurality of air holes 12 are provided on the rotor pole baffle 11.

[0037] The rotor pole baffle 11 is adapted to block the airflow towards the magnetic pole 5 inside the stator core 6, and the air hole 12 is adapted to allow the airflow to enter the stator core 6 from the magnetic pole 5.

[0038] The air vent 12 is located at a position where the airflow entering the stator core 6 from the air vent 12 does not clash with the existing airflow in the stator core 6.

[0039] In this application, the airflow, driven by the rotor pressure head, flows from the rotor support 2 to the stator frame 7, and then flows through the air vents 12 to the partitioned wind deflector 8. Under the obstruction of the partitioned wind deflector 8, the airflow flows from the stator frame 7 to the stator core 6, and then, under the obstruction of the rotor inter-pole baffle 11, it forms a deflection loop within the stator core 6 and stator frame 7. Finally, the airflow exits the partitioned wind deflector 8 from below the stator frame 7 towards the rotor support 2. This application reduces airflow convergence and avoids energy loss. The deflection loop formed within the stator core 6 and stator frame 7 increases the utilization rate of the cooling airflow.

[0040] It should be noted that the rotor support 2 inside the foundation pit 3 has multiple flat plates arranged vertically and horizontally at intervals. These plates have connecting holes for airflow. The multiple plates divide the internal space of the rotor support 2 into different air ducts, with airflow in each duct cooling different components or different locations on the same component. A rotor core is mounted on the rotor support 2, and a reducer is located at the bottom of the rotor core. A stator core is located on the side of the stator base near the rotor support 2, and a stator winding is mounted on the stator core. Magnetic poles 5 are located between the stator core and the rotor core, and magnetic pole windings 19 are mounted on the magnetic poles 5. Since the cooling airflow path of the hydro-generator in this application is an improvement on the existing hydro-generator structure, its rotor support 2, stator base, rotor core, reducer, stator core, stator winding, magnetic poles 5, and magnetic pole windings 19 are all identical to those of existing hydro-generator structures and will not be described in detail here. The following section will describe in detail the differences between the asymmetric axial partitioned cooling airflow of the hydro-generator in this application and the hydro-generator structure in the prior art.

[0041] In one alternative embodiment, the lowest-positioned windshield area corresponds to both the lowest-positioned base sub-area and the space below the stator base 7, while the windshield areas above the lowest position correspond to two adjacent base sub-areas. This allows the gas flow directions between adjacent base sub-areas to be reversed, increasing the utilization rate of the airflow used for cooling.

[0042] If the number of axial partitions of the stator frame 7 is n, where n is an odd number, ensure that the airflow direction in the highest and lowest frame partitions is from the inner diameter of the stator to the outer diameter of the stator.

[0043] The radial spokes 10 inside the stator base 7 can cooperate with the partitioned wind deflector 8 to achieve n axial partitions. The number of radial wind deflectors 9 in the partitioned wind deflector 8 should be n-1 / 2.

[0044] In one optional embodiment, the rotor inter-pole baffle 11 is arranged axially between two adjacent magnetic poles 5; wherein, the magnetic poles 5 are provided with a plurality of rotor coils in the axial direction, the gap between the magnetic poles 5 in the circumferential direction is the inter-pole air gap, and the gap between the rotor and the stator is the air gap.

[0045] In this application, the circumferential, radial, and axial directions are generally based on the motor shaft 1.

[0046] Specifically, the air vents 12 of the rotor inter-pole baffle 11 are adapted to allow airflow from the magnetic poles 5 into the stator core 6 to pass through, ensuring that the airflow entering the stator core 6 from the air vents 12 does not clash with the existing airflow in the stator core 6. This creates a flow deflection between the stator core 6 and the stator frame 7. Figure 2As shown, air vents 12 are opened at both the upper and lower ends of the rotor inter-pole baffle 11. There are three machine base sub-regions. The airflow enters the uppermost machine base sub-region through the air vents 12, and is deflected into the second machine base sub-region by the partitioned wind deflector 8. It then flows through the stator core 6 to the rotor inter-pole baffle 11, forming the existing airflow within the stator core 6. Therefore, no air vents 12 are set on the rotor inter-pole baffle 11 at the position opposite to the second machine base sub-region to prevent the airflow from entering through the air vents 12 from colliding with the existing airflow within the stator core 6. The airflow is deflected into the lowest machine base sub-region by the rotor inter-pole baffle 11 and flows out from the lowest wind deflector area. The existing airflow in the uppermost and lowest machine base sub-regions is far away from the rotor inter-pole baffle 11, so air vents 12 can be set on the rotor inter-pole baffle 11 opposite to the uppermost and lowest machine base sub-regions, respectively.

[0047] The air vents 12 of the rotor interpole baffle 11 should be matched with the zoning. The ventilation channel of the stator area corresponding to the rotor area flows radially outward. Air vents 12 of different sizes, quantities and shapes can be set. The relevant parameters can be determined by air path calculation.

[0048] The air vents 12 of the rotor inter-pole baffle 11 can be located at the upper and lower ends of the magnetic pole 5, allowing airflow entering the stator core 6 from the upper and lower ends of the magnetic pole 5 to pass through. In addition to being located at both ends of the rotor inter-pole baffle 11, the air vents 12 can also be located between the two ends of the rotor inter-pole baffle 11, ensuring they do not directly oppose the airflow direction in the stator air groove. The surface of the rotor inter-pole baffle 11 can be smooth, cooperating with the pole shoes of the magnetic pole 5 to achieve rotor salient polarization and reduce ventilation losses.

[0049] In one optional embodiment, an upper fan 13 is provided on the upper end side of the rotor yoke 4, and a lower fan 14 is provided on the lower end side of the rotor yoke 4. The upper fan 13 and the lower fan 14 can respectively accelerate the airflow from the rotor support 2 to the stator frame 7 at the upper and lower ends of the rotor yoke 4.

[0050] In one optional embodiment, a lower baffle 15 is provided on the lower end side of the magnetic pole 5. The lower baffle 15 is adapted to allow airflow from the lower end side of the rotor yoke 4 toward the magnetic pole 5 to enter the magnetic pole 5 at an upward angle. The lower baffle 15 allows the airflow to cool the magnetic pole winding 19 located outside the magnetic pole 5 and gives the airflow an axial component, thereby increasing the airflow above the magnetic pole 5. The lower baffle 15 may have a baffle with an upward angle toward the magnetic pole winding 19, allowing the airflow to enter the magnetic pole winding 19 outside the magnetic pole 5.

[0051] In one optional embodiment, a condenser 16 is provided on the upper side of the stator frame 7, the condenser 16 being adapted to cool the stator windings. Stator evaporative cooling technology is generally a room-temperature self-circulating system; the condenser 16 must be higher than the stator windings to provide sufficient gravity to drive the evaporative cooling system's self-circulation. The condenser 16 can employ plate or tubular cooling technology, and its shape can be rectangular. It can be positioned above the air cooler 17, and multiple condensers 16 can be arranged circumferentially to block airflow into the pit 3. If the condenser 16 cannot block airflow into the pit 3, circumferential baffles can be provided. The top of the condenser 16 can be connected to the pit 3.

[0052] In one optional embodiment, an air cooler 17 is provided on one end of the stator frame 7 near the partitioned wind deflector 8, and the air cooler 17 is located inside the partitioned wind deflector 8. The airflow flowing from the stator frame 7 to the partitioned wind deflector 8 can be cooled by the air cooler 17, and then form a deflection on the stator core 6 to enhance the cooling effect.

[0053] The air vent 12 and through hole 18 of this application can be regular or irregular in shape, commonly including circular holes, oval holes, rectangular holes, etc.

[0054] In one alternative embodiment, the condenser 16 is disposed on the stator frame 7 at one end away from the motor shaft 1. The condenser 16 can obstruct airflow above the stator frame 7, causing it to flow downwards.

[0055] In one optional embodiment, a through hole 18 may be provided on the top spoke of the stator frame 7, the through hole 18 being located between the stator core 6 and the condenser 16. The through hole 18 allows airflow blocked by the condenser 16 to flow into the stator frame 7. The through holes 18 may be arranged circumferentially along the stator frame 7 and evenly distributed. The size, number, and shape of the through holes 18 may vary, and the relevant parameters can be determined through airflow calculations.

[0056] In one alternative embodiment, the condenser 16 is positioned above the air cooler 17, and the air cooler 17 and the condenser 16 share a common water system. This reduces the amount of piping required.

[0057] Adjacent stator core sections 6 are supported by stator channel steel, and the space between the stator channel steel forms a stator ventilation channel. Airflow passes through the stator ventilation channel and then through the stator core 6, thereby fully cooling the stator core 6.

[0058] The stator has pressure plates at both ends, and the two pressure plates can be connected by tension screws. After the pressure plates at both ends are connected by tension screws, all six sections of the stator core form a whole.

[0059] Working principle: Under the driving force provided by the rotor pressure head, the airflow flows out from the air cooler 17 to form a downflow path. The downflow path flows through the lower end of the stator winding and enters the rotor support 2 through the connecting hole on the plate, and then splits into three paths.

[0060] After being accelerated by the lower fan 14, the first path flows through the lower end of the magnetic pole winding 19 and cools the magnetic pole winding 19 axially under the action of the rotor inter-pole baffle 11.

[0061] The second path, under the action of the rotor pressure head, flows radially into the inter-pole air gap between two adjacent rotors to cool the magnetic pole winding 19. The first two paths converge in the air gap and, under the action of the rotor inter-pole baffle 11, flow radially into the air hole 12, or axially out from the upper part of the magnetic pole winding 19.

[0062] The third airflow, under the action of the upper fan 13, flows out from the connecting hole on the rotor support 2, cools the upper end of the magnetic pole winding 19, and merges with the first two airflows at the upper end of the magnetic pole winding 19. It then passes through the upper end of the stator winding and flows into the stator frame 7 through the through hole 18. The radial spokes 10 of the stator frame 7 and the radial baffles 9 of the partitioned wind deflector 8 cooperate to partition the stator region, i.e., the region where the stator core 6 and the stator frame 7 are located, along the axial direction. The airflow from the air hole 12, flowing radially from the stator core 6 into the stator frame 7, merges with the airflow flowing in from the through hole 18 of the stator frame 7. Under the action of the radial spokes 10 of the stator frame 7 and the radial baffles 9 in the partitioned wind deflector 8, it flows from the outer edge of the stator to the inner edge of the stator, and flows downwards under the action of the rotor inter-pole baffle 11 and the pressure head of the upper fan. Under the action of the rotor pressure head, the water flows from the inner edge of the stator to the outer edge of the stator, and the stator core 6 is cooled evenly by multiple deflections. Finally, it flows out from the air cooler 17 to achieve circulating cooling.

[0063] This application solves the problem of airflow obstruction caused by the integrated cooling of the condenser 16.

[0064] The unidirectional cooling airflow improves air cooling utilization and heat dissipation efficiency, reduces unnecessary energy loss due to airflow collision in symmetrical airflow paths, and also helps reduce motor wind friction loss and improve motor temperature uniformity.

[0065] When stator evaporative cooling fails, the highest temperature is often found at the upper end of the stator winding. Secondly, large-capacity hydro generators often experience heat dissipation issues with their lead-out lines. In this airflow path, the unidirectional airflow increases the cooling air volume to the upper winding ends and the busbar rings of the stator, thus improving the cooling effect.

[0066] This application optimizes the rotor cooling structure: the upper baffle plate on the rotor is removed, and the structure of the rotor support 2 is modified to adapt to the new airflow system.

[0067] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An asymmetric axial partitioned cooling air path for a hydro-generator, disposed within a hydro-generator, the hydro-generator comprising a motor shaft (1) and a foundation pit (3) surrounding the motor shaft (1), wherein at least a rotor support (2), a rotor yoke (4), magnetic poles (5), a stator core (6), and a stator base (7) are disposed within the foundation pit (3) along the radial direction of the motor shaft (1), characterized in that, include: A partitioned windshield (8) is disposed on the side of the stator frame (7) away from the motor shaft (1). The partitioned windshield (8) has an opening facing the stator frame (7). The bottom end of the partitioned windshield (8) is lower than the bottom end of the stator frame (7). The partitioned windshield (8) is divided into several windshield sub-areas. The stator base (7) is divided into several base sub-areas, and the base sub-areas are correspondingly arranged with the windshield area, so that the airflow flows between the base sub-areas and the windshield area; The lowest windshield area corresponds to the lowest base area and the space below the stator base (7), respectively; the windshield areas above the lowest position correspond to two adjacent base areas, respectively. A rotor pole baffle (11) is provided on the side of the magnetic pole (5) near the stator core (6). The rotor pole baffle (11) is arranged axially between two adjacent magnetic poles (5). A number of air holes (12) are provided on the rotor pole baffle (11). The rotor pole baffle (11) is adapted to block the airflow in the stator core (6) toward the magnetic pole (5), and the air hole (12) is adapted to allow the airflow to enter the stator core (6) from the magnetic pole (5). Air holes (12) are opened at the upper and lower ends of the rotor inter-pole baffle (11); the air holes (12) of the rotor inter-pole baffle (11) are adapted to allow airflow from the magnetic pole (5) into the stator core (6) to pass through, and to ensure that the airflow from the air hole (12) into the stator core (6) does not collide with the existing airflow in the stator core (6), so that a deflection is formed between the stator core (6) and the stator frame (7).

2. The cooling airflow path according to claim 1, characterized in that, An upper fan (13) is provided on the upper side of the rotor yoke (4), and a lower fan (14) is provided on the lower side of the rotor yoke (4).

3. The cooling airflow path according to claim 1, characterized in that, A lower baffle (15) is provided on the lower end side of the magnetic pole (5), and the lower baffle (15) is adapted to allow airflow from the lower end side of the rotor yoke (4) toward the magnetic pole (5) to enter the magnetic pole (5) at an upward angle.

4. The cooling airflow path according to claim 1, characterized in that, A condenser (16) is provided on the upper side of the stator frame (7), and the condenser (16) is adapted to cool the stator winding.

5. The cooling airflow path according to claim 4, characterized in that, An air cooler (17) is provided on one end of the stator frame (7) near the partition wind shield (8), and the air cooler (17) is located inside the partition wind shield (8).

6. The cooling airflow path according to claim 4, characterized in that, The condenser (16) is located on the stator frame (7) at one end away from the motor shaft (1).

7. The cooling airflow path according to claim 4, characterized in that, The top plate of the stator base (7) is provided with a through hole (18), which is located between the stator core (6) and the condenser (16).

8. The cooling airflow path according to claim 5, characterized in that, The air cooler (17) and the condenser (16) share a water circuit system.

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