Symmetrically ventilated two-pole motor

Abstract

The invention relates to a symmetrically ventilated two-pole motor, belongs to the technical field of motors, and solves the technical problems of difficult vibration control, poor heat dissipation effect, low motor power density and the like of an existing two-pole box type motor. According to the solution, the symmetrically ventilated two-pole motor comprises a cooler and a machine base, a first cooling cavity and a second cooling cavity which are bilaterally symmetrical are arranged in an inner cavity of the cooler; the engine base is arranged below the cooler; a rotating shaft, a rotor, a stator and an inner fan are arranged in an inner cavity of the base; the rotor is provided with a rotor axial ventilating duct, and the middle part of the rotor is provided with a plurality of rotor radial ventilating ducts; the stator is uniformly provided with a plurality of stator radial ventilating ducts, one end of the stator facing the rotor is provided with a stator notch, the end part of the stator is provided with a stator coil, the stator coil is provided with an insulating ventilating duct, and the stator coil between the insulating ventilating duct and the stator is provided with a sealing element; and the inner fan is fixedly connected with the rotor end ring through the axial air guide cylinder. Compared with the prior art, the motor has the advantages that the vibration control difficulty is reduced, the heat dissipation effect is improved, the running speed is safer, and the motor power density is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and particularly relates to a two-pole motor with symmetrical ventilation. Background Art

[0002] In recent years, box-type generators have been favored in the domestic market due to their cost savings, small floor area, and convenient installation and maintenance. Motor companies have actively explored in the fields of high-efficiency energy conservation, vibration and noise control, shafting design, and ventilation and heat dissipation of box-type generators.

[0003] However, the development of two-pole box-type motors is restricted by disadvantages such as difficult vibration control, high rotational speed, poor heat dissipation effect, and low motor power density. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art and solve the technical problems such as difficult vibration control, poor heat dissipation effect, and low motor power density of existing two-pole box-type motors, the invention provides a two-pole motor with symmetrical ventilation.

[0005] The invention is realized through the following technical solutions.

[0006] The invention provides a two-pole motor with symmetrical ventilation, including a cooler and a machine base;

[0007] The inner cavity of the cooler is provided with a left-right symmetrical first cooling cavity and a second cooling cavity, and both the bottom ends of the first cooling cavity and the second cooling cavity are provided with a circulating air outlet and a circulating air inlet;

[0008] The machine base is arranged below the cooler. The two ends of the top of the machine base are symmetrically provided with machine base air inlets, the machine base air inlets are communicated with the circulating air outlets, the middle part of the top of the machine base is symmetrically provided with machine base air outlets, and the machine base air outlets are communicated with the circulating air inlets; the inner cavity of the machine base is provided with a rotating shaft, a rotor, a stator, and an inner fan;

[0009] The rotor is sleeved outside the rotating shaft. The rotor is provided with a rotor axial ventilation duct, and several rotor radial ventilation ducts are arranged in the middle of the rotor; a rotor end ring is arranged at the end of the rotor;

[0010] The stator is sleeved outside the rotor. The stator is evenly provided with several stator radial ventilation ducts, and the stator radial ventilation ducts in the middle of the stator are communicated with the rotor radial ventilation ducts in the middle of the rotor; a stator slot opening is arranged at one end of the stator facing the rotor, a stator coil is arranged at the end of the stator, an insulating air guiding cylinder is arranged on the stator coil, and a sealing member is arranged on the stator coil between the insulating air guiding cylinder and the stator;

[0011] The inner fans are symmetrically arranged at both ends of the rotating shaft. A number of fan blades are evenly distributed around the circumference of the inner fans. Axial ventilation holes are provided on the inner fans. The inner fans are fixedly connected to the rotor end ring through axial air ducts.

[0012] An inner circulation air path that is symmetric left and right with the center of the cooler and the center of the machine base as the symmetry line is formed inside the cooler and the machine base. The inner circulation air path includes a first inner circulation air path and a second inner circulation air path. In the first inner circulation air path, the cooling air in the first cooling chamber and the second cooling chamber blows through the stator coils, and then flows through the stator slot openings and the stator radial ventilation ducts under the drive of the inner fans and returns to the first cooling chamber and the second cooling chamber. In the second inner circulation air path, the cooling air in the first cooling chamber and the second cooling chamber blows through the stator coils, and then flows back to the first cooling chamber and the second cooling chamber after flowing through the axial ventilation holes of the inner fans, the rotor axial ventilation ducts, the rotor radial ventilation ducts, and the stator radial ventilation ducts.

[0013] Furthermore, a partition is provided in the middle of the inner cavity of the cooler. The partition divides the inner cavity of the cooler into a left and right symmetric first cooling chamber and second cooling chamber. Baffles are provided in the middle of the first cooling chamber and the second cooling chamber. One end of the baffle is connected to the bottom wall of the cooler, and the other end of the baffle does not contact the top wall of the cooler.

[0014] Furthermore, left ring stiffeners, middle ring stiffeners, and right ring stiffeners are also provided between the inner wall of the machine base and the stator. The middle ring stiffeners and the partition are on the same vertical line. The left ring stiffeners and the right ring stiffeners are respectively on the same vertical line as the baffles in the first cooling chamber and the second cooling chamber.

[0015] Furthermore, balance rings are welded on the outer sides of the inner fans at both ends of the rotating shaft.

[0016] Furthermore, the inner fans are axial-flow inner fans.

[0017] Furthermore, the height dimension of the stator slot openings is 10 - 15 mm.

[0018] Furthermore, the insulating air duct is provided with through holes, and binding tapes are provided at the through holes. The binding tapes fixedly connect the insulating air duct and the stator coils.

[0019] Furthermore, the sealing member is made of insulating conformable felt material.

[0020] The beneficial effects achieved by the present invention are:

[0021] 1. The present invention abandons the wind baffle structure inside the traditional two-pole motor, shortening the length of the machine base and the rotating shaft. According to the calculation theory of the critical speed of the rotating shaft, further improving the critical speed of the motor rotating shaft after shortening the length of the machine base and the rotating shaft, reducing the difficulty of vibration control, and ensuring a safer operating speed range for the motor. In addition, after canceling the wind baffle structure, the air inlet of the machine base directly faces the stator coil, and the cooling air directly cools the stator coil, improving the heat dissipation effect of the stator coil;

[0022] 2. The present invention selects a stator slot opening, which is larger in height than that of the traditional motor. A seal is provided on the stator coil between the insulating air guide cylinder and the stator, thus avoiding air leakage between the insulating air guide cylinder and the stator coil in the first internal circulation air path;

[0023] 3. The present invention selects an axial air guide cylinder, avoiding the cooling air from flowing through the first internal circulation air path between the axial ventilation holes of the internal fan and the rotor end ring;

[0024] 4. The present invention selects different numbers of stator radial ventilation ducts and rotor radial ventilation ducts, dividing the internal circulation air path into a first internal circulation air path and a second internal circulation air path, ensuring better heat dissipation effect of the stator coil, relatively uniform heat dissipation and cooling of the axial lengths of the stator and the rotor, making full and efficient use of the heat dissipation capacity of the internal circulation, so as to achieve the purpose of increasing the motor capacity, improving the motor power density and the motor efficiency.

[0025] Compared with the prior art, the present invention has the advantages of reduced vibration control difficulty, improved heat dissipation effect, safer operating speed, and improved motor power density. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the present invention;

[0027] Figure 2 is a schematic structural diagram of the internal fan of the present invention.

[0028] In the figure: 1. Cooler; 2. Machine base; 3. First cooling cavity; 4. Second cooling cavity; 5. Circulation air outlet; 6. Circulation air inlet; 7. Machine base air inlet; 8. Machine base air outlet; 9. Rotating shaft; 10. Rotor; 11. Stator; 12. Internal fan; 13. Rotor axial ventilation duct; 14. Rotor radial ventilation duct; 15. Rotor end ring; 16. Stator radial ventilation duct; 17. Stator slot opening; 18. Stator coil; 19. Insulating air guide cylinder; 20. Seal; 21. Fan blade; 22. Axial ventilation hole; 23. Axial air guide cylinder; 24. Partition; 25. Baffle; 26. Left ring rib plate; 27. Middle ring rib plate; 28. Right ring rib plate; 29. Balance ring. DETAILED DESCRIPTION OF THE INVENTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] As Figures 1 to 2 shown, a two-pole motor with symmetric ventilation includes a cooler 1 and a machine base 2.

[0031] In the middle of the inner cavity of the cooler 1, there is a partition plate 24. The partition plate 24 divides the inner cavity of the cooler 1 into a left and right symmetric first cooling cavity 3 and second cooling cavity 4. The cooling air ducts in the cooler 1 release cooling air to the first cooling cavity 3 and the second cooling cavity 4, and finally cool the motor. At the bottom ends of the first cooling cavity 3 and the second cooling cavity 4, there are a circulating air outlet 5 and a circulating air inlet 6 respectively. The cooling air blows out from the circulating air outlet 5 and finally enters the cooler 1 from the circulating air inlet 6. In the middle of the first cooling cavity 3 and the second cooling cavity 4, there is a baffle plate 25. One end of the baffle plate 25 is connected to the bottom wall of the cooler 1, and the other end of the baffle plate 25 does not contact the top wall of the cooler 1, so as to ensure that the cooling air returning from the circulating air inlet 6 can continue to flow through the gap between the baffle plate 25 and the top wall of the cooler 1 and then pass through the circulating air inlet 6.

[0032] The machine base 2 is arranged below the cooler 1. At both ends of the top of the machine base 2, there are symmetrically arranged machine base air inlets 7. The machine base air inlets 7 are communicated with the circulating air outlets 5. The air flowing out from the circulating air outlets 5 enters the inner cavity of the machine base 2 from the machine base air inlets 7. At the middle of the top of the machine base 2, there are symmetrically arranged machine base air outlets 8. The machine base air outlets 8 are communicated with the circulating air inlets 6. After cooling the internal structure in the inner cavity of the machine base 2, the cooling air flows out from the machine base air outlets 8 and enters the inner cavity of the cooler 1 along the circulating air inlets 6. Inside the machine base 2, there are a rotating shaft 9, a rotor 10, a stator 11 and an inner fan 12. Between the inner wall of the machine base 2 and the stator 11, there are also a left ring rib plate 26, a middle ring rib plate 27 and a right ring rib plate 28. The middle ring rib plate 27 and the partition plate 24 are on the same vertical line. The left ring rib plate 26 and the right ring rib plate 28 are respectively on the same vertical line as the baffle plates 25 of the first cooling cavity 3 and the second cooling cavity 4. The settings of the left ring rib plate 26, the middle ring rib plate 27 and the right ring rib plate 28 enable the cooling air in the inner cavity of the cooler 1 and the inner cavity of the machine base 2 to form a left and right symmetric internal circulating air path.

[0033] The rotor 10 is sleeved outside the rotating shaft 9. On the rotor 10, there are rotor axial ventilation ducts 13, and in the middle of the rotor 10, there are several rotor radial ventilation ducts 14; at the end of the rotor 10, there is a rotor end ring 15.

[0034] The stator 11 is sleeved outside the rotor 10. A number of stator radial ventilation ducts 16 are evenly arranged on the stator 11. The stator radial ventilation ducts 16 in the middle part of the stator 11 communicate with the rotor radial ventilation ducts 14 in the middle part of the rotor 10. By selecting unequal numbers of stator radial ventilation ducts 16 and rotor radial ventilation ducts 14, the internal circulation air path is divided into a first internal circulation air path and a second internal circulation air path, ensuring better heat dissipation effect of the stator coil 18. The heat dissipation and cooling of the axial lengths of the stator 11 and the rotor 10 are relatively uniform, making full and efficient use of the heat dissipation capacity of the internal circulation, so as to achieve the purpose of increasing the motor capacity, improving the motor power density and the motor efficiency. One end of the stator 11 facing the rotor 10 is provided with a stator slot opening 17. The height dimension of the stator slot opening 17 is 10 - 15 mm. The height dimension of the stator slot opening 17 is larger than that of the traditional two-pole motor, which is convenient for more cooling air to enter the stator radial ventilation ducts 16 from the stator slot opening 17. The stator coil 18 is arranged at the end of the stator 11. The stator coil 18 directly faces the air inlet 7 of the machine frame, and the cooling air directly cools the stator coil 18, improving the heat dissipation effect of the stator coil. An insulating air guide cylinder 19 is arranged on the stator coil 18. The insulating air guide cylinder 19 is provided with through holes, and binding tapes are arranged at the through holes. The binding tapes fixedly connect the insulating air guide cylinder 19 and the stator coil 18. A seal 20 is arranged on the stator coil 18 between the insulating air guide cylinder 19 and the stator 11. The seal 20 is made of insulating conformable felt material. The arrangements of the insulating air guide cylinder 19 and the seal 20 avoid air leakage between the insulating air guide cylinder 19 and the stator coil 18 in the first internal circulation air path.

[0035] The internal fans 12 are symmetrically arranged at both ends of the rotating shaft 9. The internal fans 12 are axial-flow internal fans. A number of fan blades 21 are evenly distributed on the circumference of the internal fans 12. Axial ventilation holes 22 are arranged on the internal fans 12. The internal fans 12 are fixedly connected with the rotor end rings 15 through axial air guide cylinders 23. Such an arrangement avoids the cooling air flowing through the first internal circulation air path between the axial ventilation holes 22 of the internal fans 12 and the rotor end rings 15. Balance rings 29 are welded outside the internal fans 12 at both ends of the rotating shaft 9. The balance rings 29 are used to reduce the vibration of the motor, making the motor operation more stable.

[0036] The present invention abandons the wind baffle structure inside the traditional two-pole motor, shortening the length of the machine frame 2 and the length of the rotating shaft 9. According to the calculation theory of the critical speed of the rotating shaft, further improving the critical speed of the motor rotating shaft after shortening the length of the machine frame 2 and the length of the rotating shaft 9, reducing the difficulty of vibration control, and ensuring a safer operating speed range for the motor.

[0037] Inside the cooler 1 and the machine base 2, a left-right symmetric internal circulation air path is formed with the centers of the cooler 1 and the machine base 2 as the symmetry lines. The internal circulation air path includes a first internal circulation air path and a second internal circulation air path. In the first internal circulation air path, the cooling air from the first cooling chamber 3 and the second cooling chamber 4 flows out from the circulation air outlet 5, enters the inner cavity of the machine base 2 from the machine base air inlet 7, blows over the stator coil 18, and then flows through the stator slot opening 17 and the stator radial ventilation duct 16 under the drive of the internal fan 12 and returns to the first cooling chamber 3 and the second cooling chamber 4 from the circulation air inlet 6. In the second internal circulation air path, the cooling air from the first cooling chamber 3 and the second cooling chamber 4 flows out from the circulation air outlet 5, enters the inner cavity of the machine base 2 from the machine base air inlet 7, blows over the stator coil 18, and then flows through the axial ventilation hole 22 of the internal fan 12, the rotor axial ventilation duct 13, the rotor radial ventilation duct 14 and the stator radial ventilation duct 16 and returns to the first cooling chamber 3 and the second cooling chamber 4 from the circulation air inlet 6. The first internal circulation air path and the second internal circulation air path reasonably plan the air path circulation distribution of the motor body, greatly enhance the heat dissipation capacity of the motor, and thus improve the single-machine power density of the motor and the material utilization rate.

[0038] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, the embodiments can still be modified. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A symmetrically ventilated two-pole motor, characterized in that: It comprises a cooler (1) and a base (2); The inner cavity of the cooler (1) is provided with a left-right symmetrical first cooling cavity (3) and a second cooling cavity (4), and the bottom ends of the first cooling cavity (3) and the second cooling cavity (4) are both provided with a circulating air outlet (5) and a circulating air inlet (6); The machine base (2) is arranged below the cooler (1); machine base air inlets (7) are symmetrically arranged at both ends of the top of the machine base (2); the machine base air inlets (7) are connected to the circulating air outlets (5); machine base air outlets (8) are symmetrically arranged at the middle end of the top of the machine base (2); the machine base air outlets (8) are connected to the circulating air inlet (6); the inner cavity of the machine base (2) is provided with a rotating shaft (9), a rotor (10), a stator (11) and an inner fan (12); The rotor (10) is sleeved on the outer side of the rotating shaft (9); a rotor axial ventilation passage (13) is provided on the rotor (10); a plurality of rotor radial ventilation passages (14) are provided in the middle of the rotor (10); and a rotor end ring (15) is provided at the end of the rotor (10); The stator (11) is sleeved on the outside of the rotor (10); a plurality of stator radial ventilation channels (16) are evenly arranged on the stator (11); the stator radial ventilation channel (16) in the middle of the stator (11) is communicated with the rotor radial ventilation channel (14) in the middle of the rotor (10); a stator notch (17) is arranged at one end of the stator (11) facing the rotor (10); a stator coil (18) is arranged at the end of the stator (11); an insulating air guide cylinder (19) is arranged on the stator coil (18); and a sealing member (20) is arranged on the stator coil (18) between the insulating air guide cylinder (19) and the stator (11); The inner fan (12) is symmetrically arranged at both ends of the rotating shaft (9); a plurality of fan blades (21) are evenly distributed on the circumference of the inner fan (12); an axial ventilation hole (22) is provided on the inner fan (12); and the inner fan (12) is fixedly connected to the rotor end ring (15) via an axial air guide tube (23); The cooler (1) and the machine base (2) form a left-right symmetrical internal circulation air path with the center of the cooler (1) and the center of the machine base (2) as the symmetry line. The internal circulation air path includes a first internal circulation air path and a second internal circulation air path. The first internal circulation air path is cooling air from the first cooling chamber (3) and the second cooling chamber (4) blowing through the stator coil (18), and under the drive of the internal fan (12), flowing through the stator slot (17) and the stator radial ventilation channel (16) and returning to the first cooling chamber (3) and the second cooling chamber (4); the second internal circulation air path is cooling air from the first cooling chamber (3) and the second cooling chamber (4) blowing through the stator coil (18), flowing along the axial ventilation hole (22) of the internal fan (12) through the rotor axial ventilation channel (13), the rotor radial ventilation channel (14) and the stator radial ventilation channel (16) and returning to the first cooling chamber (3) and the second cooling chamber (4).

2. A symmetrically ventilated two-pole motor according to claim 1, characterized in that: A partition (24) is provided in the middle of the inner cavity of the cooler (1), and the partition (24) divides the inner cavity of the cooler (1) into a first cooling cavity (3) and a second cooling cavity (4) which are symmetrical on the left and right. A baffle (25) is provided in the middle of the first cooling cavity (3) and the second cooling cavity (4), and one end of the baffle (25) is connected to the bottom wall of the cooler (1), and the other end of the baffle (25) does not contact the top wall of the cooler (1).

3. A symmetrically ventilated two-pole motor according to claim 2, characterized in that: A left annular rib plate (26), a middle annular rib plate (27) and a right annular rib plate (28) are further provided between the inner wall of the machine base (2) and the stator (11); the middle annular rib plate (27) and the partition plate (24) are located on the same vertical line; and the left annular rib plate (26) and the right annular rib plate (28) are located on the same vertical line as the baffle plates (25) of the first cooling chamber (3) and the second cooling chamber (4), respectively.

4. A symmetrically ventilated two-pole motor according to claim 1, characterized in that: Balancing rings (29) are welded to the two ends of the rotating shaft (9) located outside the inner fan (12).

5. A symmetrically ventilated two-pole motor according to claim 1, characterized in that: The inner fan (12) is an axial flow inner fan.

6. A symmetrically ventilated two-pole motor according to claim 1, characterized in that: The height dimension of the stator slot (17) is 10-15 mm.

7. A symmetrically ventilated two-pole motor according to claim 1, characterized in that: The insulating air duct (19) is provided with a through hole, and a binding belt is provided at the through hole, and the binding belt fixes the insulating air duct (19) and the stator coil (18) together.

8. A symmetrically ventilated two-pole motor according to claim 1, characterized in that: The sealing member (20) is made of insulating conformable felt.

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