An open type motor with a long screw fastening type ventilation end cover

Abstract

The application discloses an open-type motor with a long-screw fastening type ventilation end cover, which comprises a motor shell, front and rear ventilation end covers coaxially arranged at two ends of the motor shell, a plurality of front hole seats and a plurality of rear hole seats protrusively arranged at edges of the front and rear ventilation end covers, a plurality of long screws parallelly arranged at an outer periphery of the motor shell, screw-through holes of the front and rear hole seats respectively penetrated by two ends of the long screws, and end portions of the long screws locked by nuts, a bearing mounting ring arranged at a shaft center of the front ventilation end cover, a rotating cooperation between an inner ring of the bearing mounting ring and a motor main shaft, and a plurality of circular-arc-shaped hollow air inlet windows evenly and radially formed in the front ventilation end cover with the bearing mounting ring as a center. The long-screw end cover is fastened to the bearing active ventilation and heat dissipation, and assembly convenience and operation stability are improved.

Description

Technical Field

[0001] This invention belongs to the field of electric motors. Background Technology

[0002] Existing motor end covers are usually fixed to both ends of the base by bolts. The end face of the base needs to be pre-machined for mounting and drilling and tapping. There are many parts between the front and rear end covers and the base, which requires high precision in machining and assembly. The installation process is relatively complicated and affects assembly efficiency.

[0003] When the motor is running, the centrifugal fan at the rotor end draws in air through the air inlet window of the end cover and throws it out, forming the main cooling airflow. However, the bearing mounting area, especially between the outer ring of the front bearing and the end cover, forms a relatively closed annular gas heat exchange cavity. The heat dissipation circulation generated by the rotation of the main shaft under the effect of gas viscosity is insufficient to dissipate the bearing heat in time. The heat dissipation circulation easily forms heat accumulation, causing the temperature of the bearing outer ring to rise continuously, affecting the performance of the lubricating grease and the bearing life. Traditional ventilation structures do not adequately organize the airflow near the bearing outer ring and lack measures to actively replace the hot air in the closed cavity. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides an openable motor with a long screw fastening ventilation end cover, which combines the fastening of the long screw end cover with the active ventilation and heat dissipation of the bearing, thereby improving the ease of assembly and operational stability.

[0005] Technical Solution: To achieve the above objectives, the present invention provides an openable motor with a long screw-fastened ventilation end cover, comprising a motor housing, with a front ventilation end cover and a rear ventilation end cover coaxially mounted at both ends of the motor housing; the edges of the front and rear ventilation end covers are provided with a plurality of front and rear hole seats protruding from them; a plurality of long screws are arranged parallel to each other on the outer periphery of the motor housing, with both ends of the long screws passing through screw through holes on the front and rear hole seats respectively, and the ends of each long screw are locked by nuts; a bearing mounting ring is located at the axial center of the front ventilation end cover, and the inner ring of the bearing mounting ring is rotatably engaged with the motor main shaft through a bearing; the front ventilation end cover has a plurality of arc-shaped perforated air inlets radially and uniformly hollowed out with the bearing mounting ring as the center; a plurality of air outlets are hollowed out on the motor housing; a motor rotor, synchronous with the motor main shaft, is coaxially mounted inside the motor housing, and a rotor-end centrifugal fan is coaxially and synchronously mounted at the end of the motor rotor; a wind-gathering ring shell is coaxially mounted on the inner side of the front ventilation end cover.

[0006] Furthermore, the contour edge of the wind-gathering ring shell at the end away from the motor rotor is coaxially fixed and clamped in the annular stop inside the connection between the motor housing and the front ventilation end cover.

[0007] Furthermore, an air-gathering channel is formed inside the air-gathering ring shell, gradually converging towards the motor rotor, and the air outlet end of the air-gathering channel extends coaxially to the end of the centrifugal fan at the rotor end.

[0008] Furthermore, a ring-shaped air pressure chamber is formed on the outer side of the air-gathering ring shell; the ring-shaped air pressure chamber is connected to the outside through several air outlet windows hollowed out on the motor housing.

[0009] Furthermore, an annular gas heat exchange chamber is formed between the inner side of the outer end wall of the bearing mounting ring and the outer side of the bearing.

[0010] Furthermore, the front ventilation end cover is integrally arranged in a circumferential array with a first structural column, a second structural column, and a third structural column; the first structural column, the second structural column, and the third structural column all extend radially along the front ventilation end cover and are distributed radially.

[0011] Furthermore, the first structural column, the second structural column, and the third structural column are respectively provided with a first hollow channel, a second hollow channel, and a third hollow channel along the length direction.

[0012] The first hollow channel, the second hollow channel, and the third hollow channel are all connected to the outer ring of the annular gas heat exchange chamber at the ends near the bearing mounting ring.

[0013] A section of the first structural column near its root is coaxially mounted with a wind-driven rotating cylinder via a bearing. The rotating cylinder contains a continuous axial flow channel, within which several axial flow fans are coaxially mounted. The blades of these fans are fixedly connected to the inner wall of the rotating cylinder and rotate synchronously with it. The axial flow channel is coaxially connected to the path of the first hollow channel. The outer ring of the rotating cylinder has several radially extending wind-driven blades arranged in a circular array. It also includes a semi-circular wind shell coaxially partially surrounding the rotating cylinder, fixed to the front ventilation end cover. Under the semi-circular wind shell's partial enclosure, half of the wind-driven blades on the outer ring of the rotating cylinder are exposed within the arc-shaped perforated air inlet window, while the other half are hidden inside the semi-circular wind shell. The ends of the first, second, and third hollow channels, away from the bearing mounting ring, extend to the outline edge of the ventilation end cover and connect to the outside via the first, second, and third channel openings on the outer ring of the ventilation end cover, respectively.

[0014] When the motor rotates at high speed, the centrifugal fan at the rotor end throws the air in its location outwards under the drive of centrifugal force, thus creating wind pressure and annular airflow in the annular pressure chamber. Driven by the wind pressure, the hot air inside the annular pressure chamber is continuously discharged to the outside through several air outlets. Simultaneously, the centrifugal fan at the rotor end creates a continuous negative pressure at the end of the air-gathering channel near the fan. Driven by this negative pressure, external air is continuously drawn into the air-gathering channel through several arc-shaped perforated air inlets on the front ventilation end cover, and is ultimately thrown outwards by the centrifugal fan into the annular pressure chamber. Meanwhile, as the gas continuously flows through the arc-shaped perforated air inlets, it drives the fan blades exposed inside, causing the fan-driven drum to rotate continuously. The continuous rotation of the fan-driven drum causes the axial fan inside to rotate continuously. Driven by the axial fan, an active airflow continuously forms within the axial channel along its extension direction. Since the axial channel is on the path of the first hollow channel, a continuous active airflow is generated within the first hollow channel, and finally discharged to the outside through the first channel opening at the outer ring of the ventilation end cover. This active airflow continuously draws away the circulating air in the annular gas heat exchange chamber, creating a negative pressure within the annular gas heat exchange chamber. At the same time, the negative pressure within the annular gas heat exchange chamber is transmitted to the second and third channel openings through the second and third hollow channels, thereby causing external air to continuously pass through the second and third channel openings and replenish the heat dissipation circulation of the annular gas heat exchange chamber through the second and third hollow channels, enabling the circulation within the annular gas heat exchange chamber to continuously exchange gases with the outside.

[0015] Beneficial effects: This invention uses several long screws passing through holes on the outer edges of the front and rear end covers and locking them with nuts, so that the front and rear end covers coaxially clamp the motor housing, eliminating the need for mounting surfaces on the base end and drilling, reducing the number of parts and improving assembly efficiency. An air-gathering ring is provided inside the front ventilation end cover, which, in conjunction with the rotor end centrifugal fan, forms a gradually narrowing air-gathering channel and an annular air pressure chamber, ensuring stable main cooling airflow.

[0016] An annular gas heat exchange chamber is formed at the outer end of the bearing mounting ring, connected to the outside through three radial hollow channels. A pneumatic rotary drum is installed within one of the structural columns. Half of the outer ring of the rotary drum's pneumatic blades is exposed within the air inlet window, while the other half is shielded by a semi-circular fan casing. The existing airflow drives the drum's rotation, causing the internal axial fan to rotate accordingly. This creates an active exhaust airflow within the hollow channel of the structural column, expelling hot air from the heat exchange chamber through corresponding outlets, generating negative pressure within the chamber. Outside air is then introduced through the other two hollow channels, creating a one-extraction-two-replenishment gas exchange system that continuously removes heat from the outer end of the bearing, preventing heat accumulation. The pneumatic rotary drum is driven by the airflow, eliminating the need for an additional electric fan, resulting in a compact structure and high reliability. The overall design integrates the long screw end cap with the active ventilation and heat dissipation of the bearing, improving assembly convenience and operational stability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this solution;

[0018] Figure 2 This is a three-dimensional sectional view of the present solution;

[0019] Figure 3 This is an axial view of the front ventilation end cover;

[0020] Figure 4 This is a cross-sectional view of the front ventilation end cover of the motor as a whole.

[0021] Figure 5 This is a schematic diagram of the disassembly of the front ventilation end cover. Detailed Implementation

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] As attached Figures 1 to 5 The present invention relates to an openable motor with a long screw-fastened ventilation end cover, characterized in that: it includes a motor housing 7, and a front ventilation end cover 9 and a rear ventilation end cover 6 are coaxially mounted at both ends of the motor housing 7; the edges of the front ventilation end cover 9 and the rear ventilation end cover 6 are integrally arranged in a circumferential array with a plurality of front hole seats 3 and a plurality of rear hole seats 5, the plurality of front hole seats 3 and the plurality of rear hole seats 5 corresponding one-to-one, and each of the front hole seats 3 and the rear hole seats 5 has a screw through hole passing through it along the motor axis; the front hole seats 3 and the rear hole seats 5 are integrally formed with the front ventilation end cover 9 and the rear ventilation end cover 6 respectively, avoiding assembly errors and local stress concentration caused by separate connection; the number of hole seats can be designed as four groups, six groups or eight groups according to the axial clamping force required by the motor, preferably evenly distributed along the circumference.

[0024] Several long screws 4 are arranged parallel to each other on the outer periphery of the motor housing 7. The two ends of the long screws 4 pass through the screw through holes on the front hole seat 3 and the rear hole seat 5 respectively, and the ends of each long screw 4 are locked by nuts, so that the front ventilation end cover 9 and the rear ventilation end cover 6 coaxially clamp the motor housing 7 towards each other.

[0025] For conventional motor structures, the end covers at both ends are bolted to the base, requiring machining of mounting surfaces and drilling. This invention provides a specially designed long screw structure, which simplifies and facilitates end cover installation compared to the original motor mounting end covers, improving assembly efficiency. This long screw structure forms an integral axial clamp between the front ventilation end cover 9, the rear ventilation end cover 6, and the motor housing 7, eliminating the need to machine end cover mounting screw holes on the motor housing 7, reducing the difficulty of housing machining, and also reducing the number of bolts and alignment steps.

[0026] The bearing mounting ring 9a is located at the center of the front ventilation end cover 9. The inner ring of the bearing mounting ring 9a is rotatably engaged with the motor main shaft 10 via the bearing 11. The front ventilation end cover 9 has several radially evenly perforated arc-shaped air inlet windows 1 centered on the bearing mounting ring 9a. The bearing 11 is a deep groove ball bearing or an angular contact ball bearing, filled with high-temperature resistant grease. The front ventilation end cover 9 and the rear ventilation end cover 6 can be made of die-cast aluminum alloy or cast iron. The arc-shaped perforated air inlet windows 1 are evenly arranged along the circumference, and their total flow area is larger than the inlet area of ​​the air gathering channel 15 to reduce air intake resistance and noise.

[0027] The motor housing 7 has several air outlet windows 8 cut out; the air outlet windows 8 are preferably located on the lower circumference of the motor housing 7 near the front ventilation end cover 9, and correspond to the position of the annular air pressure chamber 12, so that the hot air thrown out by the centrifugal fan can be discharged through the shortest path.

[0028] The motor rotor 36, which is synchronous with the motor main shaft 10, is coaxially arranged inside the motor housing 7. The rotor end centrifugal fan 14 is coaxially arranged at the end of the motor rotor 36. The rotor end centrifugal fan 14 and the motor rotor 36 can be a separate assembly structure, or they can be integrally formed with the end ring or balance disc of the motor rotor 36. The blades are made of metal or high temperature resistant engineering plastic.

[0029] A concentrating ring shell 13 is coaxially arranged on the inner side of the front ventilation end cover 9; the contour edge of the concentrating ring shell 13 away from the motor rotor 36 is coaxially fixed and clamped in the annular stop 33 on the inner side of the connection between the motor housing 7 and the front ventilation end cover 9; the concentrating ring shell 13 can be made of thin-walled metal sheet by stretching or injection molding; its edge is clamped to form a circumferential seal to prevent the airflow from directly short-circuiting into the annular air pressure chamber 12 without passing through the centrifugal fan.

[0030] An air-gathering channel 15 is formed on the inner side of the air-gathering ring shell 13, gradually converging towards the motor rotor 36. The air outlet end of the air-gathering channel 15 extends coaxially to the end of the centrifugal fan 14 at the rotor end. An annular air pressure chamber 12 is formed on the outer side of the air-gathering ring shell 13. The annular air pressure chamber 12 is connected to the outside through several air outlet windows 8 on the motor housing 7. The gradually narrowing structure of the air-gathering channel 15 helps to increase the airflow velocity entering the centrifugal fan 14 and improve the inlet flow field of the centrifugal fan. The annular air pressure chamber 12 plays a role in diffusion and convergence, converting the high-speed airflow thrown out by the centrifugal fan 14 into static pressure, which is then discharged through the air outlet windows 8.

[0031] An annular gas heat exchange chamber 16 is formed between the inner side of the outer end wall of the bearing mounting ring 9a and the outer side of the bearing 11. The annular gas heat exchange chamber 16 is adjacent to the outer side of the bearing 11 and can directly receive the heat generated by the rolling friction of the bearing. The heat exchange chamber 16 is a thin annular cavity, and its axial and radial dimensions are determined according to the outer diameter of the bearing and the inner wall of the front ventilation end cover 9, so as to form a continuous airflow circulation area in a limited space.

[0032] The front ventilation end cover 9 is integrally arranged with a first structural column 20a, a second structural column 20b, and a third structural column 20c in a circumferential array. The first structural column 20a, the second structural column 20b, and the third structural column 20c all extend radially along the front ventilation end cover 9 and are distributed in a radial pattern. While undertaking the function of guiding air, the three structural columns also serve as reinforcing ribs of the front ventilation end cover 9, improving the overall rigidity and vibration resistance of the end cover.

[0033] The first structural column 20a, the second structural column 20b, and the third structural column 20c are respectively provided with a first hollow channel 24a, a second hollow channel 24b, and a third hollow channel 24c along the length direction; the hollow channels can be formed in one step when the front ventilation end cover 9 is cast, or they can be formed by drilling after processing.

[0034] The first hollow channel 24a, the second hollow channel 24b, and the third hollow channel 24c are all connected to the outer ring of the annular gas heat exchange chamber 16 at the ends near the bearing mounting ring 9a. The connection between the three channels allows the first hollow channel 24a to draw gas from the heat exchange chamber 16, and the second hollow channel 24b and the third hollow channel 24c to replenish gas to the heat exchange chamber 16, thus forming an orderly airflow replacement path.

[0035] A section of the first structural column 20a near its root is coaxially mounted with a wind-driven rotating cylinder 17 via a bearing. The rotating cylinder 17 contains a through-flow axial channel 22, within which several axial fans 21 are coaxially mounted. The blades of the axial fans 21 are fixedly connected to the inner wall of the rotating cylinder 17 and rotate synchronously with it. The axial channel 22 is coaxially connected to the channel path of the first hollow channel 24a. The outer ring of the rotating cylinder 17 is arranged in a circumferential array with several radially extending wind-driven blades 18. It also includes a semi-circular fan shell 1 that coaxially partially surrounds the outer circumference of the rotating cylinder 17. 9. The semi-circular arc-shaped fan housing 19 is fixed on the front ventilation end cover 9. Under the semi-enclosure of the semi-circular arc-shaped fan housing 19, half of the wind turbine blades 18 on the outer periphery of the wind turbine drum 17 are exposed in the arc-shaped hollow air inlet window 1, while the other half of the wind turbine blades 18 are hidden inside the semi-circular arc-shaped fan housing 19. After the wind turbine drum 17 is installed on the first structural column 20a by bearings, its axial position remains fixed and it can rotate freely. The semi-circular arc-shaped fan housing 19 and the arc-shaped hollow air inlet window 1 together form the guiding boundary of the wind turbine blades 18, so that the airflow can only push the blades on the exposed side, avoiding the wind on both sides of the wind turbine blades being affected by the wind at the same time and canceling each other out.

[0036] The first hollow channel 24a, the second hollow channel 24b, and the third hollow channel 24c extend to the contour edge of the ventilation end cover 9 at their ends away from the bearing mounting ring 9a, and are connected to the outside through the first channel opening 30a, the second channel opening 30b, and the third channel opening 30c on the outer ring of the ventilation end cover 9, respectively. The first channel opening 30a serves as an active exhaust port, while the second channel opening 30b and the third channel opening 30c serve as make-up air ports. When the dynamic pressure of the airflow discharged from the first channel opening 30a is greater than the make-up air resistance of the second and third channel openings, a stable airflow circulation can be formed among the three channel openings.

[0037] Working principle: When the motor rotates at high speed, the centrifugal fan 14 at the rotor end throws the air at its location outwards under the drive of centrifugal force, thereby creating wind pressure and annular airflow in the annular air pressure chamber 12. The hot air in the annular air pressure chamber 12 is continuously discharged to the outside through several air outlets 8 under the drive of wind pressure. At the same time, under the centrifugal drive, the centrifugal fan 14 at the rotor end creates a continuous negative pressure at one end of the air gathering channel 15 near the rotor end centrifugal fan 14. Under the drive of negative pressure, the outside air is continuously drawn into the air gathering channel 15 through several arc-shaped hollow air inlets 1 on the front ventilation end cover 9, and is finally thrown outwards by the centrifugal fan 14 to the annular air pressure chamber 12. This constitutes the main cooling air path: the outside cold air enters the air gathering channel 15 through the arc-shaped hollow air inlets 1, absorbs the heat from the front bearing area of ​​the motor and the inner surface of the end cover, is pressurized by the centrifugal fan 14 and discharged into the annular air pressure chamber 12, and then discharged through the air outlets 8.

[0038] Meanwhile, the rotation of the motor spindle 10 causes a continuous heat dissipation circulation to form inside the annular gas heat exchange chamber 16 under the action of gas viscosity force. The heat dissipation circulation inside the gas heat exchange chamber 16 continuously carries away the heat from the outer end of the bearing 11. At the same time, there is a problem of heat accumulation in the heat dissipation circulation inside the gas heat exchange chamber 16. Since the annular gas heat exchange chamber 16 is relatively closed, it is difficult to fully dissipate the heat by relying solely on the circulation formed by the rotation of the spindle. During long-term operation, the temperature of the outer ring of the bearing 11 will gradually increase.

[0039] In this design, half of the pneumatic blades 18 on the outer periphery of the pneumatic rotary drum 17 are exposed inside the arc-shaped perforated air inlet window 1, while the other half are hidden inside the semi-circular air casing 19. As the gas continuously flows through the arc-shaped perforated air inlet window 1, it drives the pneumatic blades 18 exposed inside, causing the pneumatic rotary drum 17 to rotate continuously. This continuous rotation of the pneumatic rotary drum 17 causes the axial flow fan 21 inside it to rotate continuously. Driven by the axial flow fan 21, an active airflow continuously forms within the axial flow channel 22 along the channel's extension direction. Since the axial flow channel 22 is on the path of the first hollow channel 24a, a continuous flow of active airflow 37 along its own path is formed within the first hollow channel 24a, ultimately passing through the ventilation end cover 9. The first channel opening 30a at the ring discharges to the outside. The active airflow 37 continuously draws away the circulating air in the annular gas heat exchange chamber 16, creating a negative pressure inside the annular gas heat exchange chamber 16. At the same time, the negative pressure inside the annular gas heat exchange chamber 16 is transferred to the second channel opening 30b and the third channel opening 30c through the second hollow channel 24b and the third hollow channel 24c. This causes the outside air to continuously pass through the second channel opening 30b and the third channel opening 30c, and then through the second hollow channel 24b and the third hollow channel 24c to replenish the heat dissipation circulation of the annular gas heat exchange chamber 16. This ensures that the circulation inside the annular gas heat exchange chamber 16 continuously exchanges gas with the outside, thereby preventing heat accumulation in the heat dissipation circulation inside the annular gas heat exchange chamber 16.

[0040] During this process, the rotational power of the pneumatic rotary drum 17 is taken from the existing cooling airflow inside the arc-shaped hollow air inlet window 1, without the need for additional electric fans or other driving components; the axial fan 21 actively draws air through the first hollow channel 24a, creating a continuous negative pressure inside the annular gas heat exchange chamber 16, while the second hollow channel 24b and the third hollow channel 24c achieve natural air supply. The three channels work together to form an active ventilation and heat dissipation structure for the bearing outer ring with one extraction and two supply, effectively solving the problem of heat accumulation in the closed heat exchange chamber.

[0041] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An openable motor with a long screw-fastened ventilation end cover, characterized in that: Includes a motor housing (7), with a front ventilation end cover (9) and a rear ventilation end cover (6) coaxially mounted at both ends of the motor housing (7); The front ventilation end cover (9) and the rear ventilation end cover (6) are provided with several front hole seats (3) and several rear hole seats (5) protruding from their edges. Several long screws (4) are arranged parallel to each other on the outer periphery of the motor housing (7). The two ends of the long screws (4) pass through the screw through holes on the front hole seats (3) and the rear hole seats (5) respectively, and the ends of each long screw (4) are locked by nuts. The bearing mounting ring (9a) is located at the center of the front ventilation end cover (9). The inner ring of the bearing mounting ring (9a) is rotated with the motor main shaft (10) through the bearing (11). The front ventilation end cover (9) has several arc-shaped perforated air inlet windows (1) that are evenly hollowed out radially with the bearing mounting ring (9a) as the center. The motor housing (7) has several perforated air outlet windows (8). The motor housing (7) is coaxially provided with a motor rotor (36) synchronized with the motor main shaft (10), and a rotor end centrifugal fan (14) is coaxially provided at the end of the motor rotor (36); a wind-gathering ring shell (13) is coaxially provided on the inner side of the front ventilation end cover (9).

2. The openable motor with a long screw-fastened ventilation end cover according to claim 1, characterized in that: The contour edge of the wind-gathering ring shell (13) away from the motor rotor (36) is coaxially fixed and clamped in the annular stop (33) inside the connection between the motor housing (7) and the front ventilation end cover (9).

3. The opening motor with a long screw-fastened ventilation end cover according to claim 2, characterized in that: An air-gathering channel (15) is formed on the inner side of the air-gathering ring shell (13) and gradually converges toward the motor rotor (36). The air outlet end of the air-gathering channel (15) extends coaxially to the end of the centrifugal fan (14) at the rotor end.

4. The opening motor with a long screw-fastened ventilation end cover according to claim 3, characterized in that: An annular wind pressure chamber (12) is formed on the outside of the wind-gathering ring shell (13); the annular wind pressure chamber (12) is connected to the outside through several air outlet windows (8) on the motor housing (7).

5. The opening motor with a long screw-fastened ventilation end cover according to claim 4, characterized in that: An annular gas heat exchange chamber (16) is formed between the inner side of the outer end wall of the bearing mounting ring (9a) and the outer side of the bearing (11).

6. The opening motor with a long screw-fastened ventilation end cover according to claim 5, characterized in that: The front ventilation end cover (9) is provided with a first structural column (20a), a second structural column (20b) and a third structural column (20c) arranged in a circular array; the first structural column (20a), the second structural column (20b) and the third structural column (20c) all extend along the radial direction of the front ventilation end cover (9) and are distributed radially.

7. The opening motor with a long screw-fastened ventilation end cover according to claim 6, characterized in that: The first structural column (20a), the second structural column (20b), and the third structural column (20c) are respectively provided with a first hollow channel (24a), a second hollow channel (24b), and a third hollow channel (24c) along the length direction. The first hollow channel (24a), the second hollow channel (24b), and the third hollow channel (24c) are all connected to the outer ring of the annular gas heat exchange chamber (16) at the end near the bearing mounting ring (9a); A section of the first structural column (20a) near its root is equipped with a pneumatic rotating cylinder (17) coaxially with a bearing. The pneumatic rotating cylinder (17) contains a through axial flow channel (22), within which several axial flow fans (21) are coaxially arranged. The blades of the axial flow fans (21) are all fixedly connected to the inner wall of the pneumatic rotating cylinder (17) and rotate synchronously with it. The axial flow channel (22) is coaxially connected to the channel path of the first hollow channel (24a). The pneumatic rotating cylinder ( The outer ring of 17) is arranged in a circular array with several wind turbine blades (18) extending in the radial direction; it also includes a semi-circular wind shell (19) that is coaxially half-enclosed around the outer circumference of the wind turbine (17). The semi-circular wind shell (19) is fixed on the front ventilation end cover (9). Under the semi-enclosed shape of the semi-circular wind shell (19), half of the wind turbine blades (18) around the outer circumference of the wind turbine (17) are exposed in the arc-shaped hollow air inlet window (1), and the other half of the wind turbine blades (18) are hidden inside the semi-circular wind shell (19). The first hollow channel (24a), the second hollow channel (24b), and the third hollow channel (24c) extend from the end away from the bearing mounting ring (9a) to the outline edge of the ventilation end cover (9), and are connected to the outside through the first channel opening (30a), the second channel opening (30b), and the third channel opening (30c) at the outer ring of the ventilation end cover (9), respectively.

8. The opening motor with a long screw-fastened ventilation end cover according to claim 7, characterized in that: When the motor rotates at high speed, the centrifugal fan (14) at the rotor end throws the air at its location outwards under the drive of centrifugal force, thereby forming wind pressure and annular airflow in the annular air pressure chamber (12). The hot air in the annular air pressure chamber (12) is continuously discharged to the outside through several air outlets (8) under the drive of wind pressure. At the same time, the centrifugal fan (14) at the rotor end creates a continuous negative pressure at one end of the air gathering channel (15) near the centrifugal fan (14) under the centrifugal drive. The outside air is continuously drawn into the air gathering channel (15) through several arc-shaped hollow air inlets (1) on the front ventilation end cover (9) under the drive of negative pressure, and is finally thrown outwards by the centrifugal fan (14) to the annular air pressure chamber (12). Meanwhile, as the gas flows continuously through the arc-shaped perforated air inlet window (1), it drives the wind turbine blades (18) exposed inside the arc-shaped perforated air inlet window (1), thereby causing the wind turbine drum (17) to rotate continuously. The continuous rotation of the wind turbine drum (17) causes the axial flow fan (21) inside it to rotate continuously. Driven by the axial flow fan (21), an active airflow is continuously formed in the axial flow channel (22) along the extension direction of the channel. Since the axial flow channel (22) is on the path of the first hollow channel (24a), a continuous active airflow (37) along its own path is formed in the first hollow channel (24a), and finally discharged to the outside through the first channel opening (30a) at the outer ring of the ventilation end cover (9). The airflow (37) continuously draws away the circulating air in the annular gas heat exchange chamber (16) and creates a negative pressure in the annular gas heat exchange chamber (16). At the same time, the negative pressure in the annular gas heat exchange chamber (16) is transmitted to the second channel opening (30b) and the third channel opening (30c) through the second hollow channel (24b) and the third hollow channel (24c). This allows the external air to continuously pass through the second channel opening (30b) and the third channel opening (30c) and then through the second hollow channel (24b) and the third hollow channel (24c) to replenish the heat dissipation circulation of the annular gas heat exchange chamber (16), so that the circulation in the annular gas heat exchange chamber (16) continuously exchanges gas with the outside.

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