A cooling structure for energy-saving electric motor

Abstract

The present invention relates to the technical field of motor refrigeration, and discloses a cooling structure of an energy-saving electric motor, comprising a machine body, a stator group, a stator winding, an output shaft and a rotor group, an air gap being formed between the rotor group and the stator group, a rear machine cover being installed at one end of the machine body, an inlet fan being arranged in the rear machine cover, a front machine cover being installed at the end of the machine body away from the rear machine cover, an exhaust fan being arranged inside the front machine cover, and a guide chamber being opened on the inner wall of the machine body. The cooling structure of the energy-saving electric motor utilizes the guide chamber to transport cooling air to the stator group, the stator winding and the end of the rotor group away from the inlet fan, thereby effectively dissipating the heat of the end of the components away from the inlet fan, and under the action of the guide sleeve, the cooling air is quickly flowed into the air gap and dissipates the heat inside the air gap, an exhaust fan is installed on the output shaft, and the gas flow inside the machine body is accelerated by the inlet fan and the exhaust fan, thereby effectively improving the heat dissipation efficiency inside the machine body, so as to achieve the purpose of energy saving and increasing the service life.

Description

Technical Field

[0001] The present invention relates to the technical field of motor refrigeration, in particular to a cooling structure for an energy-saving motor. Background Art

[0002] An energy-saving motor is an electric motor with high energy conversion efficiency. It achieves efficient operation and energy-saving goals by optimizing the internal structure, materials and processes of the motor and adopting advanced control strategies. It can significantly reduce energy consumption during operation, thereby achieving the purpose of energy conservation and emission reduction. Common types of energy-saving motors include permanent magnet synchronous motors, brushless DC motors and high-efficiency asynchronous motors. Energy-saving motors often use water cooling or air cooling to cool their internal structures. The core components of the water cooling mechanism mainly include water pumps, radiators, cooling pipes and heat exchangers. The core components of the air cooling mechanism mainly include fans, deflectors and heat dissipation fins. The cooling mechanism can effectively cool the internal structure of the motor.

[0003] During the operation of the motor, multiple key components will generate heat due to energy loss or friction, such as the stator winding, stator core, rotor, and the air gap between the rotor and stator. In actual application, most energy-saving motors use air cooling to dissipate heat, and the fan blades are used to provide a cooling medium to dissipate heat for the motor. However, since the fan blades are connected to the motor output shaft, the heat dissipation effect is directly related to the rotation speed of the output shaft. When the motor output shaft is in a high-speed rotation process, the components inside the motor are prone to excessive heat. When the fan blades rotate to generate airflow to cool the inside of the motor, the components closer to the fan blades can be directly blown by the airflow, thereby effectively taking away the heat. However, for the end components farther away from the fan blades (such as the ends of the stator winding, stator core, rotor, etc.), the air needs to flow a longer path to reach them. During this process, the heat will gradually dissipate, which will weaken the heat dissipation effect inside the motor and affect the working life of the motor. To this end, we propose a cooling structure for energy-saving motors. Summary of the Invention

[0004] The object of the present invention is to provide a cooling structure for an energy-saving electric motor to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a cooling structure of an energy-saving electric motor, comprising a body, a stator group fixedly mounted inside the body, a plurality of stator windings wound on the stator group, an output shaft rotatably connected to the body, and a rotor group arranged inside the stator group and sleeved on the output shaft, an air gap being formed between the rotor group and the stator group, a rear cover fixedly mounted on one end of the body, an inlet fan fixedly connected to the output shaft being arranged inside the rear cover, a front cover fixedly mounted on the end of the body away from the rear cover, and a fan fixedly connected to the output shaft being arranged inside the front cover The exhaust fan accelerates the flow of gas inside the machine body through the cooperation of the inlet fan and the exhaust fan, the inner wall of the machine body is provided with a guide chamber, and the guide chamber is connected with the inside of the rear machine cover, one end of the guide chamber is located above the stator winding and away from one end of the inlet fan, and an arc-shaped guide plate is fixedly installed on the inner wall of the machine body, and the arc-shaped guide plate is located above the stator winding and away from one end of the inlet fan, the inlet fan conveys cooling air to the arc-shaped guide plate through the guide chamber, and under the guidance of the arc-shaped guide plate, the stator group, the stator winding and the end of the rotor group away from the inlet fan are cooled.

[0006] Preferably, a plurality of diversion holes are provided in the guide chamber, and a plurality of exhaust holes and air inlet holes connected with the diversion holes are provided in the stator group. The plurality of exhaust holes and air inlet holes are staggered in the stator group, and the exhaust holes and the air inlet holes are connected with the air gap at one end away from the diversion holes. The cooling air in the guide chamber enters the air inlet holes through the diversion holes, and enters the air gap under the action of the air inlet holes to cool the air gap, and the hot air in the air gap enters the guide chamber through the exhaust holes.

[0007] Preferably, the diameter of the end of the exhaust hole communicating with the air gap is larger than the diameter of the end communicating with the diversion hole; the exhaust hole is designed to be tapered near the diversion hole;

[0008] The aperture of the end portion of the air inlet hole communicating with the diversion hole is larger than the aperture of the end portion communicating with the air gap, and the aperture of the middle region of the air inlet hole is smaller than the aperture of the end portion communicating with the air gap.

[0009] Preferably, a plurality of arc-shaped guide plates are fixedly installed inside the guide chamber, and each of the arc-shaped guide plates is installed at a diversion hole connected to the exhaust hole. The inner wall of the arc-shaped guide plate is close to the exhaust hole, and the speed of the cooling air in the guide chamber increases when passing through the arc-shaped guide plate.

[0010] Preferably, a guide disc frame is fixedly installed on the end where the body is connected to the rear cover, and a plurality of air holes are provided on the end where the body is connected to the rear cover, wherein a guide sleeve is fixedly installed on the inner wall of the end where the body is connected to the rear cover, and a conical hole is provided on the guide disc frame, and the conical hole is connected to the guide sleeve, wherein the air outlet end of the guide sleeve corresponds to the air gap, and a mounting frame is fixedly installed on the outer wall of the body, and a tube body filled with coolant is provided inside the mounting frame, and the gas in the guide chamber will be cooled by the coolant in the tube body when passing through the tube body.

[0011] Preferably, a plurality of spiral blades are fixedly installed inside the guide sleeve, and the diameter ratio of the air outlet end to the air inlet end of the guide sleeve is 1:3.

[0012] Preferably, the diameter of the blades of the exhaust fan is smaller than the diameter of the blades of the inlet fan.

[0013] Preferably, an arc-shaped guide groove is provided on the surface of the rotor assembly, and the cooling air in the guide sleeve enters the air gap through the arc-shaped guide groove.

[0014] Preferably, a plurality of guide plate frames are fixedly mounted on the arc-shaped guide plate, and the cooling air is used to dissipate heat to the stator group, the stator winding and the end of the rotor group away from the fan inlet. An air guide chamber connected to the outside of the guide plate frame is provided inside the guide plate frame, and one end of the guide chamber is close to the bending area of ​​the stator winding.

[0015] Preferably, a plurality of heat dissipation holes are provided on the front cover, wherein the diameter of the air inlet end of the heat dissipation hole is larger than the diameter of the air outlet end.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention utilizes a guide chamber to convey cooling air to the stator assembly, stator winding, and the end of the rotor assembly away from the air inlet fan, thereby effectively dissipating heat at the end of the components away from the air inlet fan. Under the action of the guide sleeve, the cooling air quickly flows into the air gap and dissipates heat inside the air gap. An exhaust fan is installed on the output shaft to accelerate the flow of gas inside the machine body through the air inlet fan and the exhaust fan. Under the action of the arc-shaped heat dissipation holes, the gas flowing out of the heat dissipation holes contacts the exhaust fan in different directions, reducing the collision rate when the gas converges. Through the structural design of the present invention, the heat dissipation efficiency inside the machine body can be effectively improved, thereby achieving the purpose of energy saving and increasing the service life.

[0018] The present invention utilizes diverter holes and exhaust holes to allow the hot air in the air gap to flow out and merge with the cooling air, and under the action of the diverter holes and the air inlet holes, the cooling air enters the air gap to dissipate heat for the air gap, the stator group, the stator winding and the rotor group, thereby realizing heat exchange of the components in the air gap, solving the problem of poor heat dissipation effect due to the long conveying path in the prior art, thereby effectively improving the heat dissipation efficiency inside the machine body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the machine body of the present invention;

[0021] Figure 3 This is a front view schematic diagram of the internal structure of the machine body of the present invention;

[0022] Figure 4 This is a schematic diagram of the rotor assembly structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the flow guide chamber, exhaust holes and air inlet holes of the present invention;

[0024] Figure 6 Schematic diagram of the arc guide plate and stator winding structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of the arc-shaped guide plate of the present invention;

[0026] Figure 8 This is a schematic diagram of the front cover structure of the present invention;

[0027] Figure 9 It is a schematic diagram of the structure of the guide sleeve of the present invention.

[0028] In the figure: 1. body; 11. rear cover; 12. intake fan; 13. front cover; 131. heat dissipation hole; 14. exhaust fan; 15. guide chamber; 16. diverter hole; 17. arc guide plate; 18. ventilation hole; 2. stator group; 21. exhaust hole; 22. intake hole; 3. stator winding; 4. output shaft; 5. rotor group; 51. arc guide groove; 6. air gap; 7. arc guide plate; 71. guide plate frame; 72. air guide chamber; 8. guide plate frame; 81. conical hole; 9. guide sleeve; 91. spiral blade; 10. mounting frame; 101. pipe body. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See also Figures 1-9 , the present invention provides a technical solution: a cooling structure of an energy-saving electric motor. During actual use, the airflow generated by the exhaust fan 14 often presents a certain distribution pattern. The airflow in the area close to the fan blades is dense, and the heat dissipation effect is good; while the airflow in the area far from the fan blades is sparse, and the heat dissipation effect is poor. This uneven airflow distribution phenomenon makes it difficult for the end components to obtain sufficient airflow support, resulting in poor heat dissipation effect. Therefore, the present invention makes corresponding improvements to the technical problems in the background technology, including a body 1, a stator group 2 fixedly installed inside the body 1, a plurality of stator windings 3 wound on the stator group 2, an output shaft 4 rotatably connected to the body 1, and a rotor group 5 arranged inside the stator group 2 and sleeved on the output shaft 4, an air gap 6 is formed between the rotor group 5 and the stator group 2. It should be noted that, in combination with the attached Figure 5 As shown, for the convenience of description, the present invention magnifies the air gap 6, a rear cover 11 is fixedly installed at one end of the body 1, an inlet fan 12 fixedly connected to the output shaft 4 is provided in the rear cover 11, a front cover 13 is also fixedly installed at the end of the body 1 away from the rear cover 11, and an exhaust fan 14 fixedly connected to the output shaft 4 is provided inside the front cover 13, the inlet fan 12 and the exhaust fan 14 are used to accelerate the flow of gas inside the body 1, a plurality of heat dissipation holes 131 are provided on the front cover 13, the blade diameter of the inlet fan 12 is slightly larger than the blade diameter of the exhaust fan 14, thereby forming a positive pressure environment inside the body 1, which is convenient for the gas circulation inside the body 1 (gas refers to the wind formed by the mixture of cooling air and hot air, the same below), combined with the attached Figure 8 As shown, there are multiple heat dissipation holes 131 on the front cover 13, and the aperture of the air inlet end of the heat dissipation hole 131 is larger than the aperture of the air outlet end. In order to reduce the collision rate when the gases converge, some of the heat dissipation holes 131 in the present invention are arranged in an arc shape. The orientation design of the outlet end makes the gas flowing out of the heat dissipation holes 131 contact the exhaust fan 14 in different directions. A guide chamber 15 is provided on the inner wall of the body 1, and the guide chamber 15 is connected to the interior of the rear cover 11. One end of the guide chamber 15 is located above the end of the stator winding 3 away from the inlet fan 12.

[0031] In actual application, since the air gap 6 is the gap between the stator assembly 2 and the rotor assembly 5, the space is usually small (for the convenience of description, the air gap 6 is magnified in the drawings), which is not conducive to heat dissipation. The increase in the temperature of the air gap 6 will lead to the performance and efficiency of the motor being reduced. Based on this, the present invention has the following design:

[0032] Further, combined with the Figure 2 and attached Figure 3 As shown, the end where the body 1 of the present invention is connected to the rear cover 11 is fixedly mounted with a guide disc frame 8, the guide disc frame 8 is arranged in an inclined shape, the end close to the output shaft 4 is relatively low, and the end close to the guide chamber 15 is relatively high, and a plurality of air holes 18 are provided at the end where the body 1 is connected to the rear cover 11, wherein a guide sleeve 9 is fixedly mounted on the inner wall of the end where the body 1 is connected to the rear cover 11, and a conical hole 81 is provided on the guide disc frame 8, the conical hole 81 is in communication with the guide sleeve 9, wherein the outlet end of the guide sleeve 9 corresponds to the air gap 6, and a plurality of spiral blades 91 are fixedly mounted inside the guide sleeve 9, combined with the attached Figure 9 As shown: the diameter ratio of the air outlet end and the air inlet end of the guide sleeve 9 is 1:3. The outer wall of the guide sleeve 9 in the present invention can be coated with a heat-insulating coating. The cooling air in the guide sleeve 9 can be accelerated by the spiral blades 91, and the diameter ratio of the air outlet end and the air inlet end is used to make the cooling air in the heat-conducting sleeve move toward the air gap 6 at a faster speed. When the cooling air flows from the guide sleeve 9 into the interior of the body 1, due to the change in space, the cooling air will escape into the internal space of the body 1. In order to increase the inflow rate of the cooling air into the air gap 6, the present invention provides an arc-shaped guide groove 51 on the surface of the rotor group 5, and the cooling air in the guide sleeve 9 enters the air gap 6 through the arc-shaped guide groove 51; it should be noted that the rotor group 5 includes a plurality of rotor cores and a squirrel cage, and the arc-shaped guide groove 51 is provided on the surface of the squirrel cage. Since the rotor group 5 is a prior art component, the present invention does not describe it in detail.

[0033] Combined with attachment Figure 2 -Attached Figure 4 During specific use, the blades of the inlet fan 12 generate cooling air to circulate inside the body 1. When the inlet fan 12 rotates, the exhaust fan 14 rotates synchronously with it. The cooling air passes through the guide disc 8 during the flow process. Part of the cooling air enters the guide chamber 15, and the remaining part of the cooling air flows along the trajectory of the guide disc 8. The cooling air entering the guide disc 8 is split again. Part of it flows into the conical hole 81 and flows into the guide sleeve 9, and the other part enters the body 1 through the air permeable hole 18. The cooling air entering the body 1 will dissipate heat to high-temperature components such as the stator group 2, the rotor group 5, and the stator winding 3, and move towards the exhaust fan 14;

[0034] The cooling air entering the guide sleeve 9 will be guided by the spiral blades 91 and accelerated along the tangential direction of the spiral blades 91. At the same time, since the diameter ratio of the air outlet end and the air inlet end of the guide sleeve 9 is 1:3, the cooling air in the guide sleeve 9 will rush to the air gap 6 at a faster speed. After the cooling air flows out, since the internal space of the body 1 is larger than the internal space of the guide sleeve 9, part of the cooling air will escape into the internal space of the body 1, and the remaining cooling air will rush into the air gap 6 to cool the air gap 6, and part of the cooling air close to the rotor group 5 will enter the air gap 6 under the action of the arc guide groove 51.

[0035] In order to dissipate heat from the air gap 6 and the end of the stator assembly 2, the stator winding 3, and the rotor assembly 5 away from the inlet fan 12, the present invention has the following design: an arc-shaped guide plate 7 is fixedly mounted on the inner wall of the housing 1, and the arc-shaped guide plate 7 is located above the end of the stator winding 3 away from the inlet fan 12. The inlet fan 12 delivers cooling air to the arc-shaped guide plate 7 through the guide chamber 15. A plurality of guide plate frames 71 are fixedly mounted on the arc-shaped guide plate 7. The guide plate frames 71 allow the cooling air to dissipate heat from the stator assembly 2, the stator winding 3, and the end of the rotor assembly 5 away from the inlet fan 12.

[0036] When the stator winding 3 is energized, Joule heat is generated. The greater the current density, the more heat is generated. Due to structural limitations, the current path is relatively concentrated in the curved area of ​​the stator winding 3, which in turn increases the current density and generates more heat. To address this, the present invention provides an air guide chamber 72 in communication with the exterior of the guide plate frame 71. One end of the guide chamber 15 is close to the curved area of ​​the stator winding 3.

[0037] Combined with attachment Figure 8 As shown, the cooling air entering the guide chamber 15 will move along the trajectory of the arc-shaped guide plate 7. Part of the cooling air will flow along the guide plate frame 71 to the stator group 2, the stator winding 3 and the end of the rotor group 5 to dissipate heat therefrom, while the remaining cooling air will pass through the air guide chamber 72 to dissipate heat in the curved area of ​​the stator winding 3. The cooled gas will flow through the heat dissipation holes 131 to the exhaust fan 14.

[0038] However, in actual application, since the stator group 2, the stator winding 3 and the rotor group 5 have a certain length, the cooling air flows, and the components that are farther away from the fan 12 are more difficult to dissipate heat. In view of this, the present invention makes the following design: a plurality of diversion holes 16 are provided in the guide chamber 15, and a plurality of exhaust holes 21 and air inlet holes 22 connected to the diversion holes 16 are provided in the stator group 2, and the exhaust holes 21 and the air inlet holes 22 are connected to the air gap 6 at one end away from the diversion hole 16. The cooling air in the guide chamber 15 enters the exhaust holes 21 and the air inlet holes 22 through the diversion holes 16, and enters the air gap 6 under the action of the exhaust holes 21 and the air inlet holes 22 to cool the air gap 6. The end holes of the exhaust holes 21 connected to the air gap 6 The diameter is larger than the end aperture connected to the diverter hole 16; the exhaust hole 21 is tapered near the diverter hole 16; the end aperture of the air inlet hole 22 connected to the diverter hole 16 is larger than the end aperture connected to the air gap 6, and the aperture of the middle area of ​​the air inlet hole 22 is smaller than the end aperture connected to the air gap 6. It should be noted that the air gap 6 is magnified in the accompanying drawings, wherein the area inside the guide chamber 15 is larger than the area of ​​the air gap 6; a plurality of arc-shaped guide plates 17 are fixedly installed inside the guide chamber 15, and each arc-shaped guide plate 17 is installed at the diverter hole 16 connected to the exhaust hole 21. The speed of the cooling air in the guide chamber 15 increases when passing through the arc-shaped guide plate 17, and the cooling air speed on the upper surface of the arc-shaped guide plate 17 is greater than the gas speed flowing out of the exhaust hole 21;

[0039] Combined with attachment Figure 3 and attached Figure 5 As shown, the temperature of the cooling air entering the air gap 6 increases after flowing for a distance. Since the cross-sectional area of ​​the exhaust hole 21 at the end of the air gap 6 is large, and the exhaust hole 21 is tapered near the diverter hole 16, the flow rate of the exhaust hole 21 at the end of the air gap 6 is low and the static pressure is high, while the flow rate at the guide chamber 15 is accelerated and the static pressure is reduced, so that the pressure difference can be used to promote the gas in the air gap 6 to flow into the guide chamber 15, and then part of the hot air in the air gap 6 will enter the exhaust hole 21 along the end of the exhaust hole 21. Figure 5 As shown, the cooling air speed on the upper surface of the arc guide plate 17 is greater than the gas speed flowing out of the exhaust hole 21, and then the cold air speed is greater than the hot air speed at this location, that is, the pressure in the cold air path area is less than the pressure in the hot air path area, which causes the low pressure in the cold air path to attract the high-pressure airflow in the hot air path, forming a "negative pressure guide" to play a guiding role. At the same time, under the action of the arc guide plate 17, the hot air is smoothly merged with the cold air path, reducing the gas collision rate, and then the hot air in the air gap 6 can flow out through the exhaust hole 21. When the cooling air in the guide chamber 15 passes through the air inlet hole 22, combined with the attached Figure 5As shown, since the air inlet hole 22 belongs to the branch flow channel of the guide chamber 15, and the aperture of the end of the air inlet hole 22 communicating with the diverter hole 16 is larger than the aperture of the end communicating with the air gap 6, and the aperture of the middle area (i.e., the throat) of the air inlet hole 22 is smaller than the aperture of the end communicating with the air gap 6, combined with the attached Figure 5 As shown, the two ends of the air inlet hole 22 are designed to be gradually contracted and expanded toward the middle area. When the gas in the guide chamber 15 flows to the air inlet hole 22, since the area of ​​the connection between the air inlet hole 22 and the diverter hole 16 is larger than the middle area of ​​the air inlet hole 22, that is, the pressure at the connection between the air inlet hole 22 and the diverter hole 16 is greater than the pressure in the middle area, the middle area of ​​the air inlet hole 22 is a low-pressure area, so the pressure difference is used to make the gas flow from the high-pressure guide chamber 15 to the low-pressure air inlet hole 22, so as to enhance the suction force of the gas in the guide chamber 15 into the air gap 6, and the end of the middle area to the connection between the air inlet hole 22 and the air gap 6 is gradually expanded, so as to restore part of the static pressure, which can reduce energy loss on the one hand and avoid it on the other hand. , in the gradually expanding section (where the air inlet hole 22 is connected to the air gap 6), the gas cross-section gradually increases, the flow rate slows down, and the static pressure can be restored. At this time, the gas has entered the air inlet hole 22 and is close to the air gap 6, and flows toward the air gap 6, so that the gas in the air inlet hole 22 flows into the air gap 6, that is, the cooling air is driven into the air gap 6 to cool the air gap 6. Since the air gap 6 is the gap between the stator group 2 and the rotor group 5, and the stator winding 3 is wound on the stator group 2, the cooling air will take away the heat of the stator group 2, the stator winding 3 and the rotor group 5 during the movement in the air inlet hole 22 and the air gap 6. Therefore, the structural design of the present invention can effectively dissipate heat and cool the stator group 2, the stator winding 3 and the rotor group 5;

[0040] Continuing from the above, when the air gap 6, the stator group 2, the stator winding 3 and the rotor group 5 in the area away from the inlet fan 12 are cooled, the hot air at the air gap 6 is gathered into the cooling air in the guide chamber 15, which will cause the temperature of the cooling air to rise. In order to avoid affecting the heat dissipation of the stator group 2, the stator winding 3 and the rotor group 5 at one end away from the inlet fan 12, the present invention has a mounting frame 10 fixedly installed on the outer wall of the machine body 1, and a tube body 101 filled with coolant is provided inside the mounting frame 10. The gas in the guide chamber 15 will be cooled by the coolant in the tube body 101 when passing through the tube body 101, so that the temperature of the cooling air at the initial position of the guide chamber 15 is relatively low. Although it will then merge with the hot air, it can still dissipate heat to the stator group 2, the stator winding 3 and the rotor group 5 at one end. The heat is dissipated at one end of the group 3 and the rotor group 5 away from the fan inlet 12. Since the stator group 2, the stator winding 3 and the rotor group 5 are made of metal materials (metal materials are used to replace the stator group 2, the stator winding 3 and the rotor group 5 below), if the cooling air with a lower temperature is in direct contact with the metal material with a higher temperature, thermal stress is easily generated, which will affect the strength of the metal material in the long run. Then, the mixture of hot air and cooling air can effectively reduce the temperature of the cooling air. On the one hand, the cooling air of appropriate temperature can effectively cool the metal material, and on the other hand, it can also avoid the influence of the cooling air with a lower temperature on the metal material. Then, the structural design of the present invention can effectively dissipate heat and cool the inside of the body 1, reduce the working energy consumption of the motor, and achieve the purpose of energy saving and increasing service life.

[0041] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0042] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A cooling structure for an energy-saving electric motor, comprising a body (1), a stator group (2) fixedly mounted inside the body (1), a plurality of stator windings (3) wound around the stator group (2), an output shaft (4) rotatably connected to the body (1), and a rotor group (5) disposed inside the stator group (2) and sleeved on the output shaft (4), an air gap (6) being formed between the rotor group (5) and the stator group (2), a rear cover (11) being fixedly mounted on one end of the body (1), an inlet fan (12) fixedly connected to the output shaft (4) being disposed inside the rear cover (11), and characterized in that: The end of the machine body (1) away from the rear machine cover (11) is also fixedly mounted with a front machine cover (13), and an exhaust fan (14) fixedly connected to the output shaft (4) is provided inside the front machine cover (13), and the air flow inside the machine body (1) is accelerated by the cooperation of the inlet fan (12) and the exhaust fan (14), and a guide chamber (15) is provided on the inner wall of the machine body (1), and the guide chamber (15) is communicated with the inside of the rear machine cover (11), and one end of the guide chamber (15) is located at the stator winding (3) and A curved guide plate (7) is fixedly mounted on the inner wall of the body (1) and is located above one end of the stator winding (3) and away from the end of the inlet fan (12). The inlet fan (12) delivers cooling air to the curved guide plate (7) through the guide chamber (15), and under the guidance of the curved guide plate (7), the stator group (2), the stator winding (3) and the rotor group (5) away from the end of the inlet fan (12) are cooled. A plurality of diversion holes (16) are provided in the guide chamber (15), and a plurality of exhaust holes (21) and air inlet holes (22) are provided in the stator group (2) and are communicated with the diversion holes (16). The plurality of exhaust holes (21) and air inlet holes (22) are arranged in a staggered manner in the stator group (2), and one end of the exhaust holes (21) and the air inlet holes (22) away from the diversion holes (16) is communicated with the air gap (6). The cooling air in the guide chamber (15) enters the air inlet holes (22) through the diversion holes (16) and enters the air gap (6) under the action of the air inlet holes (22) to cool the air gap (6), and the hot air in the air gap (6) enters the guide chamber (15) through the exhaust holes (21); The diameter of the end portion of the exhaust hole (21) communicating with the air gap (6) is larger than the diameter of the end portion communicating with the diverter hole (16); the exhaust hole (21) is designed to be tapered near the diverter hole (16); The aperture of the end portion of the air inlet hole (22) communicating with the diversion hole (16) is larger than the aperture of the end portion communicating with the air gap (6), and the aperture of the middle region of the air inlet hole (22) is smaller than the aperture of the end portion communicating with the air gap (6); A plurality of arc-shaped guide plates (17) are fixedly installed inside the guide chamber (15), and each of the arc-shaped guide plates (17) is installed at a diversion hole (16) connected to the exhaust hole (21). The inner wall of the arc-shaped guide plate (17) is close to the exhaust hole (21), and the speed of the cooling air in the guide chamber (15) increases when passing through the arc-shaped guide plate (17).

2. The cooling structure of an energy-saving electric motor according to claim 1, characterized in that: A guide disc frame (8) is fixedly mounted on one end of the machine body (1) connected to the rear cover (11), and a plurality of air holes (18) are provided on the one end of the machine body (1) connected to the rear cover (11), wherein a guide sleeve (9) is fixedly mounted on the inner wall of the one end of the machine body (1) connected to the rear cover (11), and a conical hole (81) is provided on the guide disc frame (8), and the conical hole (81) and the guide sleeve (9) are in a connected state, wherein the air outlet end of the guide sleeve (9) corresponds to the air gap (6), and a mounting frame (10) is fixedly mounted on the outer wall of the machine body (1), and a tube body (101) filled with cooling liquid is provided inside the mounting frame (10), and the gas in the guide chamber (15) passes through the tube body (101) and is cooled by the cooling liquid in the tube body (101).

3. The cooling structure of an energy-saving electric motor according to claim 2, characterized in that: A plurality of spiral blades (91) are fixedly mounted inside the guide sleeve (9), and the diameter ratio between the air outlet end and the air inlet end of the guide sleeve (9) is 1:

3.

4. The cooling structure of an energy-saving electric motor according to claim 1, characterized in that: The diameter of the blades of the exhaust fan (14) is smaller than the diameter of the blades of the inlet fan (12).

5. The cooling structure of an energy-saving electric motor according to claim 3, characterized in that: An arc-shaped guide groove (51) is provided on the surface of the rotor assembly (5), and the cooling air in the guide sleeve (9) enters the air gap (6) through the arc-shaped guide groove (51).

6. The cooling structure of an energy-saving electric motor according to claim 4, characterized in that: A plurality of guide plate frames (71) are fixedly mounted on the arc-shaped guide plate (7), and the cooling air is used to dissipate heat from the stator group (2), the stator winding (3), and the end of the rotor group (5) away from the inlet fan (12) through the guide plate frames (71). An air guide chamber (72) communicating with the outside of the guide plate frame (71) is provided inside the guide plate frame (71), and one end of the guide chamber (15) is close to the bending area of ​​the stator winding (3).

7. The cooling structure of an energy-saving electric motor according to claim 1, characterized in that: The front cover (13) is provided with a plurality of heat dissipation holes (131), wherein the diameter of the air inlet end of the heat dissipation hole (131) is larger than the diameter of the air outlet end.

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