A permanent magnet explosion-proof motor and its cooling system

Abstract

The invention discloses a permanent magnet explosion-proof motor, comprising a motor housing, a stator and a rotor shaft of the motor; a front cover and a rear cover are respectively fixedly and sealedly installed coaxially at both ends of the water-cooled motor housing; a front flameproof bearing sleeve is coaxially arranged on the inner ring of the front cover, and a flameproof joint surface a is formed between the inner ring surface of the end of the front flameproof bearing sleeve close to the stator and the outer cylindrical surface of the motor rotor shaft; the inner ring surface of the end of the front flameproof bearing sleeve away from the stator and the outer cylindrical surface of the motor rotor shaft is rotationally matched through a bearing a; an oil seal ring is coaxially and tightly fixedly connected to the end of the front flameproof bearing sleeve away from the stator and the rotor through a flange structure, and the oil seal inner ring of the oil seal ring is rotationally sealed with the outer cylindrical surface of the motor rotor shaft; while improving the explosion-proof protection performance, the cooling and lubrication of the bearing are guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of motors. Background Art

[0002] In the chemical, petroleum and other industries, motors are easily placed in flammable and explosive environments, which put forward higher requirements on the explosion-proof performance of equipment; traditional motors may cause explosions due to brush sparks, high temperatures and other reasons, so a special explosion-proof motor that is both safe and efficient is needed;

[0003] In explosion-proof motors, since the stator and rotor of the motor are prone to generate sparks during operation, the inner cavity of the stator and rotor of the explosion-proof motor is in a closed state, and external circulation air cooling in the axial direction cannot be achieved, which results in a lack of air cooling for the main shaft bearings. At the same time, if the motor bearings are not adequately lubricated and cooled, they are prone to heat, wear and sparking. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a permanent magnet explosion-proof motor and a cooling system thereof, which improve the explosion-proof protection performance while ensuring the cooling and lubrication of the bearings.

[0005] Technical solution: To achieve the above purpose, a permanent magnet explosion-proof motor of the present invention comprises a water-cooled motor housing, a stator and a motor rotor shaft; the two ends of the water-cooled motor housing are respectively and coaxially fixedly and sealedly mounted with a front cover and a rear cover;

[0006] A front flameproof bearing sleeve is coaxially arranged on the inner ring of the front end cover, and a flameproof joint surface a is formed between the inner ring surface of the front flameproof bearing sleeve at one end close to the stator and rotor and the outer cylindrical surface of the motor rotor shaft; the inner ring surface of the front flameproof bearing sleeve at one end away from the stator and rotor is rotationally matched with the outer cylindrical surface of the motor rotor shaft through a bearing a; an oil seal ring is coaxially and tightly fixedly connected to the end of the front flameproof bearing sleeve away from the stator and rotor through a flange structure, and the oil seal inner ring of the oil seal ring is rotationally sealed with the outer cylindrical surface of the motor rotor shaft.

[0007] Furthermore, a front explosion-proof ring wall is coaxially integrated with the outer ring of the front explosion-proof bearing sleeve, and a circle b explosion-proof joint surface is formed between the front explosion-proof ring wall and the side of the inner ring of the front end cover close to the stator and rotor, and the front explosion-proof ring wall and the inner ring of the front end cover are coaxially fixed to each other through a flange structure.

[0008] Furthermore, a bearing retaining ring is provided between the inner ring of the oil seal and the a bearing, and the side of the a bearing retaining ring away from the a bearing is coaxially pressed with a retaining ring, and the a retaining ring is clamped in the retaining ring groove on the outer cylindrical surface of the motor rotor shaft: the side of the inner ring of the a bearing away from the a bearing retaining ring is pressed against the a shaft shoulder on the motor rotor shaft.

[0009] Furthermore, a rear flameproof bearing sleeve is coaxially arranged on the inner ring of the rear end cover, and a flameproof joint surface c is formed between the inner ring surface of the rear flameproof bearing sleeve at one end close to the stator and rotor and the outer cylindrical surface of the motor rotor shaft; the inner ring surface of the rear flameproof bearing sleeve at one end away from the stator and rotor and the outer cylindrical surface of the motor rotor shaft are rotationally matched through a bearing b; the end of the rear flameproof bearing sleeve away from the stator and rotor is coaxially and tightly sealed and fixedly connected with an end sealing cover through a flange structure, and a rear flameproof ring wall is coaxially and integrally arranged on the outer ring of the rear flameproof bearing sleeve, and a flameproof joint surface d is formed between the rear flameproof ring wall and a side surface of the inner ring of the rear end cover close to the stator and rotor, and the rear flameproof ring wall and the inner ring of the rear end cover are coaxially fixed to each other through the flange structure.

[0010] Furthermore, a b bearing retaining ring is provided between the end sealing cover and the b bearing to coaxially press against one side of the b bearing inner ring, and the side of the b bearing inner ring away from the b bearing retaining ring presses against the b shaft shoulder on the motor rotor shaft.

[0011] Furthermore, an annular purge chamber a is formed between the outer ring at the a shoulder on the motor rotor shaft and the inner ring of the front flameproof bearing sleeve, which is close to the ball groove on one side of the a bearing; a folded line channel a with a folded line path is provided at the upper part of the front flameproof bearing sleeve, and a folded line channel b with a folded line path is provided at the upper part of the oil seal ring, one end of the a folded line channel and one end of the b folded line channel are connected to each other at the joint surface of the front flameproof bearing sleeve and the oil seal ring; the other end of the a folded line channel is obliquely connected to the upper part of the annular purge chamber a, and the other end of the b folded line channel faces upward and is connected A longitudinally extended exhaust pipe a extending upward is connected; an air intake channel is coaxially arranged inside the motor rotor shaft, and one end of the air intake channel is connected to the outside through an air intake port at one end of the motor rotor shaft; a circle of a oil storage ring groove is arranged on the inner wall of the middle section of the air intake channel, and an oblique a centrifugal purge channel a is also arranged inside the motor rotor shaft; one end of the a centrifugal purge channel a is connected to the outer circle of the a oil storage ring groove a, and the other end is obliquely connected to an annular purge bin a, and the gas or liquid blown into the a annular purge bin from the a centrifugal purge channel a is just aligned with and sprayed toward the ball groove on one side of the a bearing.

[0012] Furthermore, an annular purge chamber b is formed between the outer ring at the b shoulder on the motor rotor shaft and the inner ring of the rear flameproof bearing sleeve, which is close to the ball groove on one side of the b bearing; a zigzag channel c with a zigzag path is provided at the upper part of the rear flameproof bearing sleeve, and a zigzag channel d with a zigzag path is provided at the upper part of the end sealing cover, one end of the c zigzag channel and one end of the d zigzag channel are connected to each other at the joint surface between the end sealing cover and the rear flameproof bearing sleeve; the other end of the c zigzag channel is obliquely connected to the upper part of the b annular purge chamber, and the other end of the d zigzag channel faces upward and is connected to the b longitudinal extended exhaust pipe extending upward; a circle of b oil storage ring groove is provided on the inner wall of the tail end of the air inlet channel, and an oblique b centrifugal purge channel is also provided in the motor rotor shaft; one end of the b centrifugal purge channel is connected to the outer ring of the b oil storage ring groove, and the other end is obliquely connected to the b centrifugal purge channel, and the gas or liquid blown into the b annular purge chamber from the b centrifugal purge channel is just aligned with and sprayed toward the ball groove on one side of the b bearing.

[0013] Furthermore, before the motor is started, a certain amount of lubricating oil remains at the bottom of the oil storage ring groove a and the oil storage ring groove b.

[0014] Beneficial effect: When sparks or explosions occur in the inner cavity of the stator and rotor of the motor, the flameproof joint surface a, the flameproof joint surface d, the flameproof joint surface c and the flameproof joint surface b serve to isolate the sparks from contact with the flammable and explosive gas outside the motor, thereby avoiding explosion accidents in the external environment.

[0015] During the starting stage of the motor, the balls in the ball grooves of the bearings are swept and moistened by the lubricating oil in the centrifugal sweeping channel, thereby ensuring that the bearings are fully lubricated after each motor start-up, reducing friction loss and heat generation; and subsequently forming a continuous bearing air-cooling cycle, thereby achieving continuous active air cooling on the basis of full lubrication of the bearings, thereby suppressing the heating of the bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 This is a schematic diagram of the overall structure of this scheme;

[0017] Attached Figure 2 This is a cross-sectional view of this solution, in which the rotating shaft is not cut open;

[0018] Attached Figure 3 For attachment Figure 2 A partially enlarged schematic diagram of the front part;

[0019] Attached Figure 4 For attachment Figure 2 A cross-sectional view of the rotating shaft is included on the basis. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] As attached Figures 1 to 4 A permanent magnet explosion-proof motor and its cooling system are shown, wherein a motor body 26 includes a water-cooled motor housing 24, and a water cooling channel is arranged inside the water-cooled motor housing 24; a stator coil 22 is fixedly arranged coaxially on the inner side of the water-cooled motor housing 24, a permanent magnet stator 23 is rotatably arranged coaxially on the inner side of the stator coil 22, and the axis of the permanent magnet stator 23 is coaxially fixed on the motor rotor shaft 16; a front end cover 5 and a rear end cover 10 are respectively coaxially fixed and sealed at both ends of the water-cooled motor housing 24 by flange bolts.

[0022] Front flameproof structure of the motor:

[0023] The inner ring of the front end cover 5 is coaxially provided with a front flameproof bearing sleeve 7, and a flameproof joint surface 18 is formed between the inner ring surface of the end of the front flameproof bearing sleeve 7 close to the stator and rotor and the outer cylindrical surface of the motor rotor shaft 16; the inner ring surface of the end of the front flameproof bearing sleeve 7 away from the stator and rotor and the outer cylindrical surface of the motor rotor shaft 16 are rotationally matched through a bearing a 20; the end of the front flameproof bearing sleeve 7 away from the stator and rotor is tightly and fixedly connected with an oil seal ring 1 coaxially through a flange structure, and the oil seal inner ring 1.1 of the oil seal ring 1 is rotationally sealed with the outer cylindrical surface of the motor rotor shaft 16 through a sealed oil seal structure (for example, a labyrinth oil seal structure); the outer ring of the front flameproof bearing sleeve 7 is coaxially integrated with a front flameproof ring wall 7.1, and a circle of flameproof joint surface 27 is formed between the front flameproof ring wall 7.1 and a side surface of the inner ring of the front end cover 5 close to the stator and rotor, and the front flameproof ring wall 7.1 is fixedly connected to the inner ring of the front end cover 5. The rings are coaxially fixed to each other through a flange structure; an oil seal dust cover 29 is fixedly installed on the outer end of the oil seal ring 1; an a bearing retaining ring 320 is arranged between the oil seal inner ring 1.1 and the a bearing 20 to coaxially press one side of the inner ring of the a bearing 20, and the a bearing retaining ring 320 is coaxially pressed with an a retaining ring 31 on the side away from the a bearing 20, and the a retaining ring 31 is clamped in the retaining ring groove 30 on the outer cylindrical surface of the motor rotor shaft 16: the side of the bearing inner ring of the a bearing 20 away from the a bearing retaining ring 320 is pressed with the a shaft shoulder 16.1 on the motor rotor shaft 16; the a bearing 20 is isolated outside the inner cavity of the motor stator and rotor through the a flameproof joint surface 18 and the b flameproof joint surface 27, thereby realizing the subsequent external circulation cooling and lubrication of the two motor bearings while ensuring the closedness of the inner cavity of the motor stator and rotor, and avoiding the explosion-proof performance being affected by the connection between the inside and outside of the motor.

[0024] The rear explosion-proof structure of the motor:

[0025] The inner ring of the rear end cover 10 is coaxially provided with a rear flameproof bearing sleeve 11, and a flameproof joint surface c 15 is formed between the inner ring surface of the end of the rear flameproof bearing sleeve 11 close to the stator and rotor and the outer cylindrical surface of the motor rotor shaft 16; the inner ring surface of the end of the rear flameproof bearing sleeve 11 away from the stator and rotor and the outer cylindrical surface of the motor rotor shaft 16 are rotatably matched through a b bearing 14; the end of the rear flameproof bearing sleeve 11 away from the stator and rotor is tightly and sealedly fixedly connected with an end sealing cover 12 through a flange structure coaxially, and the outer ring of the rear flameproof bearing sleeve 11 is coaxially integrated with a rear flameproof ring wall 11.1, a circle d flameproof joint surface 41 is formed between the rear flameproof ring wall 11.1 and the side of the inner ring of the rear end cover 10 close to the stator and rotor, and the rear flameproof ring wall 11.1 and the inner ring of the rear end cover 10 are fixed coaxially with each other through a flange structure; a b bearing retaining ring 60 is provided between the end sealing cover 12 and the b bearing 14 to coaxially press one side of the inner ring of the b bearing 14, and the side of the inner ring of the b bearing 14 away from the b bearing retaining ring 60 presses the b shaft shoulder 55 on the motor rotor shaft 16; the rear flameproof bearing sleeve 11 and the front flameproof bearing sleeve 7 are connected to the two end covers The matching surfaces of the motor rotor shaft 16 and the motor rotor shaft 16 respectively form a flameproof joint surface 18, d flameproof joint surface 41, c flameproof joint surface 15 and b flameproof joint surface 27. When sparks or explosions occur inside the motor, a flameproof joint surface 18, d flameproof joint surface 41, c flameproof joint surface 15 and b flameproof joint surface 27 serve to isolate the sparks from contact with the flammable and explosive gases outside the motor. It mainly acts to prevent the internal explosion from propagating to the explosive gas mixture around the shell, ensuring that the parts in the shell that may generate sparks, arcs, and dangerous temperatures are kept away from the shell. The flammable gas, dust or steam outside the body is separated, so as not to become the ignition source of the surrounding dangerous gas and dust environment, thereby avoiding the effect of causing explosion accidents in the external environment; at the same time, the two bearings are isolated outside the stator and rotor inner cavity at the flameproof joint surface a 18, the flameproof joint surface d 41, the flameproof joint surface c 15 and the flameproof joint surface b 27, so that the bearing cooling system in the following text realizes the external circulation cooling and lubrication of the two motor bearings, while ensuring the closedness of the inner cavity of the stator and rotor of the motor, avoiding the explosion-proof performance being affected by the connection between the inside and outside of the motor.

[0026] Cooling and lubrication system for motor bearings:

[0027] An a-shaped purge chamber 32 is formed between the outer ring at the a-shoulder 16.1 on the motor rotor shaft 16 and the inner ring of the front flameproof bearing sleeve 7, which is close to the ball groove on one side of the a-bearing 20; an a-shaped folded line channel 6 with a folded line path is provided at the upper part of the front flameproof bearing sleeve 7, and a b-shaped folded line channel 2 with a folded line path is provided at the upper part of the oil seal ring 1, and one end of the a-shaped folded line channel 6 and one end of the b-shaped folded line channel 2 are connected to each other at the joint surface of the front flameproof bearing sleeve 7 and the oil seal ring 1; the other end of the a-shaped folded line channel 6 is obliquely connected to the upper part of the a-shaped purge chamber 32, and the other end of the b-shaped folded line channel 2 faces upward, and is connected to the upwardly extending a longitudinally extended exhaust pipe 3; an air intake channel 17 is coaxially arranged inside the motor rotor shaft 16, and one end of the air intake channel 17 is connected to the outside through an air intake port 21 at one end of the motor rotor shaft 16; a circle of a oil storage ring groove 51 is arranged on the inner wall of the middle section of the air intake channel 17, and an oblique a centrifugal purge channel 19 is also arranged inside the motor rotor shaft 16; one end of a centrifugal purge channel 19 is connected to the outer circle of a oil storage ring groove 51, and the other end is obliquely connected to a annular purge bin 32, and the gas or liquid blown into a annular purge bin 32 from a centrifugal purge channel 19 is just aligned with and sprayed toward the ball groove on one side of a bearing 20.

[0028] A b annular purge chamber 33 is formed between the outer ring at the b shoulder 55 on the motor rotor shaft 16 and the inner ring of the rear flameproof bearing sleeve 11, which is close to the ball groove on one side of the b bearing 14; a c folded line channel 8 with a folded line path is provided at the upper part of the rear flameproof bearing sleeve 11, and a d folded line channel 13 with a folded line path is provided at the upper part of the end sealing cover 12, one end of the c folded line channel 8 and one end of the d folded line channel 13 are connected to each other at the joint surface of the end sealing cover 12 and the rear flameproof bearing sleeve 11; the other end of the c folded line channel 8 is obliquely connected to the b annular purge chamber 33, the other end of the d folded line channel 13 faces upward and is connected to the b longitudinally extended exhaust pipe 9 extending upward; a circle of b oil storage ring groove 52 is arranged on the inner wall of the tail end of the intake channel 17, and an oblique b centrifugal purge channel 100 is also arranged in the motor rotor shaft 16; one end of the b centrifugal purge channel 100 is connected to the outer circle of the b oil storage ring groove 52, and the other end is obliquely connected to the b centrifugal purge channel 100, and the gas or liquid blown into the b annular purge chamber 33 from the b centrifugal purge channel 100 is just aligned with and sprayed toward the ball groove on one side of the b bearing 14.

[0029] Before the motor is started, a certain amount of lubricating oil is continuously stored at the bottom of the oil storage ring groove a 51 and the oil storage ring groove b 52 .

[0030] The lubrication and cooling principle of bearings is taken as an example of the lubrication and cooling of bearing A 20:

[0031] Before the motor is running, a certain amount of lubricating oil is continuously stored at the bottom of the oil storage ring groove 51 by artificial axial injection. At the same time, when the motor body 26 is in a horizontal idle state, if the a centrifugal purge channel 19 is just on the upper side of the axis of the motor rotor shaft 16, a small amount of lubricating oil in the a bearing 20 will flow downward into the a oil storage ring groove 51 along the a centrifugal purge channel 19 under the action of gravity. In short, before the motor body 26 is started, a certain amount of lubricating oil is stored at the bottom of the a oil storage ring groove 51;

[0032] After the motor body 26 is started, the motor rotor shaft 16 rotates at a predetermined speed, and the lubricating oil remaining at the bottom of the a oil storage ring groove 51 rotates with the drag of the inner wall of the a oil storage ring groove 51, thereby forming a centrifugal force, and then the rotating lubricating oil in the a oil storage ring groove 51 enters the a centrifugal purge channel 19 under the action of the centrifugal force. The lubricating oil entering the a centrifugal purge channel 19 is farther away from the axis of the motor rotor shaft 16, resulting in a greater centrifugal force on the lubricating oil in the a centrifugal purge channel 19. Therefore, the lubricating oil entering the a centrifugal purge channel 19 is quickly sprayed toward the a annular purge bin 32 under the action of the centrifugal force, and the lubricating oil is evenly purged into the ball groove on one side of the a bearing 20, so that the balls in the ball groove of the a bearing 20 are purged and soaked by the lubricating oil in the a centrifugal purge channel 19 during the starting stage of the motor, thereby ensuring that the a bearing 20 is fully lubricated once after each motor start-up, thereby reducing friction loss and heat generation;

[0033] As the motor rotor shaft 16 continues to rotate, after the lubricating oil entering the a centrifugal purge channel 19 is completely purged into the ball groove of the a bearing 20, the a centrifugal purge channel 19 is filled with air; at this time, since the motor rotor shaft 16 is in a high-speed rotating state, the air in the a centrifugal purge channel 19 is also continuously subjected to centrifugal force, so the air in the a centrifugal purge channel 19 continuously flows to the a annular purge bin 32 under the action of centrifugal force, thereby forming the following gas cooling cycle:

[0034] The external cold air first enters the air intake channel 17 through the air inlet 21, and then the cold air in the air intake channel 17 is supplemented into the a centrifugal purge channel 19 under the action of negative pressure. The cold air entering the a centrifugal purge channel 19 continuously blows the air from the air intake channel 17 into the a annular purge chamber 32 under the action of centrifugal force, and blows it to the high-speed running a bearing 20, so that the high-speed running a bearing 20 is continuously blown by the fresh air from the a centrifugal purge channel 19, thereby achieving a continuous active air cooling effect; at the same time, the hot air in the a annular purge chamber 32 is discharged to the outside through the a folded line channel 6, the b folded line channel 2 and the a longitudinal extension exhaust pipe 3 in turn under the action of wind pressure, thus forming a continuous bearing air cooling cycle, thereby realizing continuous active air cooling on the basis of sufficient lubrication of the bearing, thereby suppressing the heating of the bearing.

[0035] Similarly, the lubrication and cooling principles of the b bearing 14 are the same as above.

[0036] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A permanent magnet explosion-proof motor, characterized in that: It comprises a water-cooled motor housing (24), a stator and a motor rotor shaft (16); a front end cover (5) and a rear end cover (10) are respectively and coaxially fixedly and sealedly mounted at both ends of the water-cooled motor housing (24); The inner ring of the front end cover (5) is coaxially provided with a front flameproof bearing sleeve (7); the inner ring surface of the front flameproof bearing sleeve (7) at one end close to the stator and rotor forms a flameproof joint surface (18) with the outer cylindrical surface of the motor rotor shaft (16); the inner ring surface of the front flameproof bearing sleeve (7) at one end away from the stator and rotor is rotationally engaged with the outer cylindrical surface of the motor rotor shaft (16) via a bearing (20); the end of the front flameproof bearing sleeve (7) away from the stator and rotor is coaxially tightly and fixedly connected with an oil seal ring (1) via a flange structure; the oil seal inner ring (1.1) of the oil seal ring (1) is rotationally sealed with the outer cylindrical surface of the motor rotor shaft (16); The outer ring of the front flameproof bearing sleeve (7) is coaxially integrated with a front flameproof ring wall (7.1), a flameproof joint surface (27) is formed between the front flameproof ring wall (7.1) and a side surface of the inner ring of the front end cover (5) close to the stator and rotor, and the front flameproof ring wall (7.1) and the inner ring of the front end cover (5) are coaxially fixed to each other via a flange structure; An a-bearing retaining ring (320) is provided between the oil seal inner ring (1.1) and the a-bearing (20) to coaxially press against one side of the a-bearing (20) inner ring; a-bearing retaining ring (320) is coaxially press-fitted with an a-retaining ring (31) on the side away from the a-bearing (20); the a-retaining ring (31) is clamped in a retaining ring groove (30) on the outer cylindrical surface of the motor rotor shaft (16); and a-bearing retaining ring (320) is press-fitted with an a-shaft shoulder (16.1) on the motor rotor shaft (16) on the side of the a-bearing inner ring (20) away from the a-bearing retaining ring (320); The inner ring of the rear end cover (10) is coaxially provided with a rear flameproof bearing sleeve (11), and a flameproof joint surface c (15) is formed between the inner ring surface of the end of the rear flameproof bearing sleeve (11) close to the stator and rotor and the outer cylindrical surface of the motor rotor shaft (16); the inner ring surface of the end of the rear flameproof bearing sleeve (11) away from the stator and rotor and the outer cylindrical surface of the motor rotor shaft (16) are rotatably matched via a bearing b (14); the end of the rear flameproof bearing sleeve (11) away from the stator and rotor is coaxially tightly and sealedly fixedly connected to an end sealing cover (12) via a flange structure, and the outer ring of the rear flameproof bearing sleeve (11) is coaxially integrated with a rear flameproof annular wall (11.1), and a flameproof joint surface d (41) is formed between the rear flameproof annular wall (11.1) and a side surface of the inner ring of the rear end cover (10) close to the stator and rotor, and the rear flameproof annular wall (11.1) and the inner ring of the rear end cover (10) are coaxially fixed to each other via a flange structure; A b bearing retaining ring (60) is provided between the end sealing cover (12) and the b bearing (14) to coaxially press against one side of the inner ring of the b bearing (14); the side of the inner ring of the b bearing (14) away from the b bearing retaining ring (60) is pressed against a b shaft shoulder (55) on the motor rotor shaft (16); An a-shaped purge chamber (32) is formed between the outer ring of the a-shaft shoulder (16.1) on the motor rotor shaft (16) and the inner ring of the front flameproof bearing sleeve (7), and is close to the ball groove on one side of the a-bearing (20); an a-shaped folded line channel (6) with a folded line path is provided at the upper part of the front flameproof bearing sleeve (7); a b-shaped folded line channel (2) with a folded line path is provided at the upper part of the oil seal ring (1); one end of the a-shaped folded line channel (6) and one end of the b-shaped folded line channel (2) are connected to each other at the joint surface between the front flameproof bearing sleeve (7) and the oil seal ring (1); the other end of the a-shaped folded line channel (6) is obliquely connected to the upper part of the a-shaped purge chamber (32); the other end of the b-shaped folded line channel (2) faces upward and is connected to the upwardly extending a longitudinally extended exhaust pipe (3); an air intake channel (17) is coaxially arranged inside the motor rotor shaft (16), and one end of the air intake channel (17) is connected to the outside through an air intake port (21) at one end of the motor rotor shaft (16); a circle of a oil storage ring groove (51) is arranged on the inner wall of the middle section of the air intake channel (17), and an oblique a centrifugal purge channel (19) is also arranged inside the motor rotor shaft (16); one end of the a centrifugal purge channel (19) is connected to the outer circle of the a oil storage ring groove (51), and the other end is obliquely connected to an annular purge bin (32), so that the gas or liquid blown into the a annular purge bin (32) from the a centrifugal purge channel (19) is just aligned with and sprayed toward the ball groove on one side of the a bearing (20).

2. The cooling system of a permanent magnet explosion-proof motor according to claim 1, characterized in that: A b annular purge chamber (33) is formed between the outer ring at the b shoulder (55) on the motor rotor shaft (16) and the inner ring of the rear flameproof bearing sleeve (11), and is close to the ball groove on one side of the b bearing (14); a c folded line channel (8) with a folded line path is provided at the upper part of the rear flameproof bearing sleeve (11); a d folded line channel (13) with a folded line path is provided at the upper part of the end sealing cover (12); one end of the c folded line channel (8) and one end of the d folded line channel (13) are connected to each other at the joint surface between the end sealing cover (12) and the rear flameproof bearing sleeve (11); the other end of the c folded line channel (8) is obliquely connected to the b annular purge chamber (33). The d folded channel (13) is located at the upper part of the chamber (33), and the other end of the d folded channel (13) faces upward and is connected to the b longitudinally extended exhaust pipe (9) extending upward; the inner wall of the tail end of the air inlet channel (17) is provided with a circle of b oil storage ring groove (52), and the motor rotor shaft (16) is also provided with an oblique b centrifugal purge channel (100); one end of the b centrifugal purge channel (100) is connected to the outer circle of the b oil storage ring groove (52), and the other end is obliquely connected to the b centrifugal purge channel (100), and the gas or liquid blown into the b annular purge chamber (33) from the b centrifugal purge channel (100) is just aligned with and sprayed toward the ball groove on one side of the b bearing (14).

3. The cooling system of a permanent magnet explosion-proof motor according to claim 2, characterized in that: Before the motor is started, a certain amount of lubricating oil is stored at the bottom of the oil storage ring groove a (51) and the oil storage ring groove b (52).

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