Cooling structure of energy-saving motor

Abstract

The invention relates to the technical field of motor refrigeration, and discloses an energy-saving motor cooling structure, which comprises a machine body, a stator group, a stator winding, an output shaft and a rotor group, an air gap is formed between the rotor group and the stator group, one end of the machine body is provided with a rear machine cover, an air inlet fan is arranged in the rear machine cover, and one end of the machine body far away from the rear machine cover is provided with a front machine cover. According to the cooling structure of the energy-saving motor, cooling air is conveyed to the ends, away from the air inlet fan, of the stator set, the stator winding and the rotor set through the flow guide cavity, so that heat dissipation can be effectively conducted on the ends, away from the air inlet fan, of components, and the cooling efficiency is improved. The cooling air rapidly flows into the air gap under the action of the flow guide sleeve and dissipates heat in the air gap, the exhaust fan is installed on the output shaft, air flow in the machine body is accelerated through the air inlet fan and the exhaust fan, the heat dissipation efficiency in the machine body can be effectively improved, and the purposes of saving energy and prolonging the service life are achieved.

Description

Technical Field

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

[0002] An energy-saving motor is a 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, as well as adopting advanced control strategies, so as to significantly reduce power consumption during operation, thereby achieving the purpose of energy conservation and emission reduction. The common types of energy-saving motors mainly include permanent magnet synchronous motors, brushless DC motors, and high-efficiency asynchronous motors. Energy-saving motors often use water cooling or air cooling methods to cool their internal structures. The core components of the water cooling mechanism mainly include a water pump, a radiator, a cooling pipeline, and a heat exchanger. The core components of the air cooling mechanism mainly include a fan, a deflector, and heat dissipation fins. Through the cooling mechanism, the internal structure of the motor can be effectively cooled. During the operation of the motor, multiple key components generate heat due to energy loss or friction, such as the stator winding, stator core, rotor, and the air gap between the rotor and the stator. In actual applications, most energy-saving motors use air cooling for heat dissipation. The fan blades are used to provide a cooling medium for heat dissipation of 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 rotating at a high speed, the components inside the motor are prone to overheating. When the fan blades rotate to generate an air flow to cool the inside of the motor, the components closer to the fan blades can be directly blown by the air flow, thereby effectively taking away the heat. However, for the end components far from the fan blades (such as the ends of components such as the stator winding, stator core, and rotor), the air needs to flow a longer path to reach, and the heat will gradually dissipate during this process, resulting in a weakened heat dissipation effect inside the motor and affecting the working life of the motor. Therefore, we propose a cooling structure for an energy-saving motor. Summary of the Invention

[0003] The purpose of the present invention is to provide a cooling structure for an energy-saving motor to solve the problems raised in the above background art.

[0004] To achieve the above object, the present invention provides the following technical solution: A cooling structure for an energy-saving motor, comprising a body, a stator group fixedly installed inside the body, a plurality of stator windings wound around the stator group, an output shaft rotatably connected to the body, and a rotor group disposed inside the stator group and sleeved on the output shaft. An air gap is formed between the rotor group and the stator group. A rear end cover is fixedly installed at one end of the body, and an intake fan fixedly connected to the output shaft is arranged inside the rear end cover. A front end cover is also fixedly installed at the end of the body away from the rear end cover, and an exhaust fan fixedly connected to the output shaft is arranged inside the front end cover. The intake fan and the exhaust fan cooperate to accelerate the gas flow inside the body. A diversion chamber is formed on the inner wall of the body, and the diversion chamber communicates with the inside of the rear end cover. One end of the diversion chamber is located above the end of the stator winding away from the intake fan, and an arc-shaped guiding plate is fixedly installed on the inner wall of the body, and the arc-shaped guiding plate is located above the end of the stator winding away from the intake fan. The intake fan conveys the cooling air to the arc-shaped guiding plate through the diversion chamber, and under the guiding action of the arc-shaped guiding plate, the end of the stator group, the stator winding, and the rotor group away from the intake fan are dissipated.

[0005] Preferably, a plurality of diversion holes are formed in the diversion chamber, and a plurality of exhaust holes and intake holes communicating with the diversion holes are arranged in the stator group. The plurality of exhaust holes and intake holes are arranged in a staggered manner in the stator group, and the ends of the exhaust holes and intake holes away from the diversion holes communicate with the air gap. The cooling air in the diversion chamber enters the intake holes through the diversion holes, and enters the air gap under the action of the intake holes to cool the air gap, and the hot air in the air gap enters the diversion chamber through the exhaust holes.

[0006] Preferably, the aperture of the end of the exhaust hole communicating with the air gap is larger than the aperture of the end communicating with the diversion hole; the exhaust hole is designed to be tapered near the diversion hole; The aperture of the end of the intake hole communicating with the diversion hole is larger than the aperture of the end communicating with the air gap, and the aperture of the middle region of the intake hole is smaller than the aperture of the end communicating with the air gap.

[0007] Preferably, a plurality of arc-shaped diversion plates are fixedly installed inside the diversion chamber, and each arc-shaped diversion plate is installed at the diversion hole communicating with the exhaust hole. The inner wall of the arc-shaped diversion plate is close to the exhaust hole, and the speed of the cooling air in the diversion chamber increases when passing through the arc-shaped diversion plate.

[0008] Preferably, a flow guiding disc frame is fixedly installed at one end of the machine body connected to the rear cover, and a plurality of air permeable holes are formed at one end of the machine body connected to the rear cover. An inner wall of one end of the machine body connected to the rear cover is fixedly installed with a flow guiding sleeve, and a conical hole is formed in the flow guiding disc frame. The conical hole is in communication with the flow guiding sleeve. The air outlet end of the flow guiding sleeve corresponds to the air gap. An installation frame is fixedly installed on the outer wall of the machine body, and a pipe body filled with coolant is sleeved inside the installation frame. The gas in the flow guiding chamber will be cooled by the coolant in the pipe body when passing through the pipe body.

[0009] Preferably, a plurality of spiral blades are fixedly installed inside the flow guiding sleeve, and the diameter ratio of the air outlet end to the air inlet end of the flow guiding sleeve is 1:3.

[0010] Preferably, the diameter of the fan blades of the exhaust fan is smaller than that of the fan blades of the intake fan.

[0011] Preferably, an arc-shaped guiding groove is formed on the surface of the rotor group, and the cooling air in the flow guiding sleeve enters the air gap through the arc-shaped guiding groove.

[0012] Preferably, a plurality of flow guiding plate frames are fixedly installed on the arc-shaped guiding plate. Through the flow guiding plate frames, the cooling air dissipates heat from one end of the stator group, the stator winding and the rotor group away from the intake fan. An air guiding chamber communicating with the outside is formed inside the flow guiding plate frame, and one end of the air guiding chamber is close to the bending area of the stator winding.

[0013] Preferably, a plurality of heat dissipation holes are formed in the front cover, and the aperture of the air inlet end of the heat dissipation hole is larger than that of the air outlet end.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention utilizes the flow guiding chamber to convey the cooling air to one end of the stator group, the stator winding and the rotor group away from the intake fan, so as to effectively dissipate heat from one end of the components away from the intake fan. Under the action of the flow guiding 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. The intake fan and the exhaust fan are used to accelerate the gas flow inside the machine body. 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 gases converge. Through the structural design of the present invention, the heat dissipation efficiency inside the machine body can be effectively improved, so as to achieve the purpose of energy saving and extending the service life. The present invention makes the hot air in the air gap flow out and converge with the cooling air by using shunt holes and exhaust holes, and under the action of the shunt holes and intake holes, the cooling air enters the air gap to dissipate heat from the air gap, stator group, stator winding and rotor group, so that heat exchange can be realized for the components at the air gap, solving the problem of poor heat dissipation due to the long conveying path in the prior art, and thus effectively improving the heat dissipation efficiency inside the machine body. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the machine body of the present invention; Figure 3 It is a front schematic diagram of the internal structure of the machine body of the present invention; Figure 4 It is a schematic diagram of the structure of the rotor group of the present invention; Figure 5 It is a schematic diagram of the structure of the diversion chamber, exhaust holes and intake holes of the present invention; Figure 6 It is a schematic diagram of the structure of the arc-shaped guide plate and the stator winding of the present invention; Figure 7 It is a schematic diagram of the structure of the arc-shaped guide plate of the present invention; Figure 8 It is a schematic diagram of the structure of the front machine cover of the present invention; Figure 9 It is a schematic diagram of the structure of the diversion sleeve of the present invention.

[0016] In the figure: 1. Machine body; 11. Rear machine cover; 12. Intake fan; 13. Front machine cover; 131. Heat dissipation holes; 14. Exhaust fan; 15. Diversion chamber; 16. Shunt holes; 17. Arc-shaped drainage plate; 18. Vent holes; 2. Stator group; 21. Exhaust holes; 22. Intake holes; 3. Stator winding; 4. Output shaft; 5. Rotor group; 51. Arc-shaped guide groove; 6. Air gap; 7. Arc-shaped guide plate; 71. Guide plate frame; 72. Air guide chamber; 8. Diversion disc frame; 81. Conical holes; 9. Diversion sleeve; 91. Spiral blades; 10. Installation frame; 101. Pipe body. Detailed Embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figures 1 - 9, the present invention provides a technical solution: a cooling structure for an energy-saving motor. During actual use, the airflow generated by the exhaust fan 14 often shows a certain distribution pattern. The airflow is dense in the area closer to the fan blades, and the heat dissipation effect is good; while the airflow is sparse in the area farther from the fan blades, and the heat dissipation effect is poor. This uneven airflow distribution 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 art, including a body 1, a stator group 2 fixedly installed 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 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 intake fan 12 fixedly connected to the output shaft 4 is provided inside 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 intake fan 12 and the exhaust fan 14 are used to accelerate the gas flow inside the body 1. A plurality of heat dissipation holes 131 are opened on the front cover 13. The diameter of the fan blades of the intake fan 12 is slightly larger than the diameter of the fan blades of the exhaust fan 14, so as to form a positive pressure environment inside the body 1 to facilitate the gas flow inside the body 1 (the gas refers to the wind formed by the mixture of cooling air and hot air, the same below). In combination with the attached Figure 8 As shown, there are a plurality of heat dissipation holes 131 on the front cover 13, and the diameter of the intake end of the heat dissipation holes 131 is larger than the diameter of the 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. By designing the orientation of the outlet end, the gas flowing out of the heat dissipation holes 131 contacts the exhaust fan 14 in different directions. A diversion chamber 15 is opened on the inner wall of the body 1, and the diversion chamber 15 is communicated with the inside of the rear cover 11. One end of the diversion chamber 15 is located above the end of the stator winding 3 away from the intake fan 12.

[0019] During actual application, since the air gap 6 is the gap between the stator group 2 and the rotor group 5, the space is usually narrow (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 a decrease in the performance of the motor and a reduction in efficiency. Based on this, the present invention makes the following design: Further, in combination with the attached Figure 2 and the attached Figure 3As shown, one end of the body 1 of the present invention connected to the rear cover 11 is fixedly installed with a diversion disc frame 8. The diversion disc frame 8 is arranged in an inclined shape of 1. The position of one end close to the output shaft 4 is relatively low, and the position of one end close to the diversion chamber 15 is relatively high. A plurality of ventilation holes 18 are opened at one end of the body 1 connected to the rear cover 11. An inner wall of one end of the body 1 connected to the rear cover 11 is fixedly installed with a diversion sleeve 9. A conical hole 81 is opened on the diversion disc frame 8, and the conical hole 81 is in communication with the diversion sleeve 9. The air outlet end of the diversion sleeve 9 corresponds to the air gap 6. A plurality of spiral blades 91 are fixedly installed inside the diversion sleeve 9. Combined with the attached Figure 9 As shown: The diameter ratio of the air outlet end to the air inlet end of the diversion sleeve 9 is 1:3. The outer wall of the diversion sleeve 9 in the present invention can be coated with a heat insulation coating. The spiral blades 91 can accelerate the cooling air in the diversion sleeve 9, and use the diameter ratio of the air outlet end to the air inlet end to make the cooling air in the heat conduction sleeve move towards the air gap 6 at a relatively fast speed. When the cooling air flows from the diversion sleeve 9 into the body 1, due to the change in space, the cooling air will then disperse into the internal space of the body 1. In order to improve the inflow rate of the cooling air into the air gap 6, the present invention opens an arc-shaped guiding groove 51 on the surface of the rotor group 5. The cooling air in the diversion sleeve 9 enters the air gap 6 through the arc-shaped guiding groove 51; it should be noted that the rotor group 5 includes a plurality of rotor cores and a squirrel cage. The arc-shaped guiding groove 51 is opened 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; Combined with the attached Figure 2 - attached Figure 4 In the specific use process, the fan blades of the intake fan 12 generate cooling air to flow into the body 1. During the rotation of the intake fan 12, the exhaust fan 14 rotates synchronously with it. When the cooling air flows through the diversion disc frame 8, part of the cooling air enters the diversion chamber 15, and the remaining part of the cooling air flows along the track of the diversion disc frame 8 and enters the diversion disc frame 8. The cooling air that enters the diversion disc frame 8 is further divided. One part flows into the conical hole 81 and surges into the diversion sleeve 9, and the other part passes through the ventilation hole 18 and enters the body 1. The cooling air that enters the body 1 will dissipate heat from 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; The cooling air that enters the flow guide sleeve 9 will be guided by the spiral blades 91 and accelerate in the tangential direction of the spiral blades 91. At the same time, since the diameter ratio of the air outlet end to the air inlet end of the flow guide sleeve 9 is 1:3, the cooling air in the flow guide sleeve 9 rushes towards the air gap 6 at a relatively high speed. After the cooling air flows out, since the internal space of the machine body 1 is larger than the internal space of the flow guide sleeve 9, part of the cooling air dissipates into the internal space of the machine body 1, and the remaining part of the cooling air will rush into the air gap 6 to cool the air gap 6. The part of the cooling air close to the rotor group 5 will enter the air gap 6 under the action of the arc-shaped guide groove 51.

[0020] In order to dissipate heat from the air gap 6 and the ends of the stator group 2, stator winding 3, and rotor group 5 away from the intake fan 12, the present invention makes the following design: an arc-shaped guide plate 7 is fixedly installed on the inner wall of the machine body 1, and the arc-shaped guide plate 7 is located above the end of the stator winding 3 away from the intake fan 12. The intake fan 12 transports the cooling air to the arc-shaped guide plate 7 through the flow guide chamber 15. A plurality of guide plate frames 71 are fixedly installed on the arc-shaped guide plate 7, and through the guide plate frames 71, the cooling air dissipates heat from the ends of the stator group 2, stator winding 3, and rotor group 5 away from the intake fan 12. After the stator winding 3 is energized, Joule heat will be generated. The greater the current density, the more heat will be generated. Furthermore, due to structural limitations in the bending area of the stator winding 3, the current path is relatively concentrated, which will lead to an increase in the current density and thus generate more heat. In response to this, the present invention has a wind guide chamber 72 opened inside the guide plate frame 71 and communicating with its outside, and one end of the flow guide chamber 15 is close to the bending area of the stator winding 3. Combined with the attached Figure 8 As shown, the cooling air that enters the flow 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 ends of the stator group 2, stator winding 3, and rotor group 5 to dissipate heat from them, while the remaining part of the cooling air will pass through the wind guide chamber 72 to dissipate heat from the bending area of the stator winding 3. The cooled gas will then flow through the heat dissipation holes 131 to the exhaust fan 14. However, in the actual application process, due to the certain lengths of the stator group 2, the stator windings 3, and the rotor group 5, when the cooling air flows, it becomes more difficult for the components farther away from the intake fan 12 to dissipate heat. Therefore, the present invention makes the following design: A plurality of shunt holes 16 are opened in the diversion chamber 15, and a plurality of exhaust holes 21 and intake holes 22 communicating with the shunt holes 16 are arranged in the stator group 2. The ends of the exhaust holes 21 and the intake holes 22 away from the shunt holes 16 communicate with the air gap 6. The cooling air in the diversion chamber 15 enters the exhaust holes 21 and the intake holes 22 through the shunt holes 16, and enters the air gap 6 under the action of the exhaust holes 21 and the intake holes 22 to cool the air gap 6. The aperture of the end of the exhaust hole 21 communicating with the air gap 6 is larger than the aperture of the end communicating with the shunt hole 16; the exhaust hole 21 is designed to be tapered near the shunt hole 16; the aperture of the end of the intake hole 22 communicating with the shunt hole 16 is larger than the aperture of the end communicating with the air gap 6, and the aperture in the middle area of the intake hole 22 is smaller than the aperture of the end communicating with the air gap 6. It should be noted that the air gap 6 is magnified in the attached drawings, and the area inside the diversion chamber 15 is larger than the area of the air gap 6; A plurality of arc-shaped diversion plates 17 are fixedly installed inside the diversion chamber 15, and each arc-shaped diversion plate 17 is installed at the shunt hole 16 communicating with the exhaust hole 21. The speed of the cooling air in the diversion chamber 15 increases when passing through the arc-shaped diversion plate 17, and the speed of the cooling air on the upper surface of the arc-shaped diversion plate 17 is greater than the speed of the gas flowing out of the exhaust hole 21; Combined with the attached Figure 3 drawing and the attached Figure 5 As shown, after the cooling air entering the air gap 6 flows for a certain distance, its temperature rises. Since the cross-sectional area of the exhaust hole 21 at the air gap 6 end is larger and the exhaust hole 21 is designed to be tapered near the shunt hole 16, the flow rate of the exhaust hole 21 at the air gap 6 end is lower and the static pressure is higher, while the flow rate at the diversion chamber 15 is faster and the static pressure is lower. Thus, the pressure difference can be utilized to promote the gas in the air gap 6 to flow into the diversion chamber 15. 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. Combined with the attached Figure 5 drawing as shown, the speed of the cooling air on the upper surface of the arc-shaped diversion plate 17 is greater than the speed of the gas flowing out of the exhaust hole 21. Then, the cold air speed is greater than the hot air speed at this position, that is, the pressure in the cold air path area is less than the pressure in the hot air path area. Thus, the low pressure in the cold air path attracts the high-pressure air flow in the hot air path, forming a "negative pressure diversion" to play a diversion role. At the same time, under the action of the arc-shaped diversion plate 17, the hot air gently converges with the cold air path, reducing the gas collision rate. Then, the hot air in the air gap 6 can flow out through the exhaust hole 21. When the cooling air in the diversion chamber 15 passes through the intake hole 22, combined with the attached Figure 5As shown, since the intake hole 22 belongs to the branch flow channel of the diversion chamber 15, and the aperture of the end of the intake hole 22 communicating with the shunt hole 16 is larger than the aperture of the end communicating with the air gap 6, and the aperture of the middle region (i.e., the throat) of the intake 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 intake hole 22 are designed to be tapered - divergent towards the middle region. Thus, when the gas in the diversion chamber 15 flows to the intake hole 22, since the area of the connection between the intake hole 22 and the shunt hole 16 is larger than the middle region of the intake hole 22, that is, the pressure at the connection between the intake hole 22 and the shunt hole 16 is greater than the pressure in the middle region, the middle region of the intake hole 22 is a low - pressure area. Therefore, the pressure difference is used to make the gas flow from the high - pressure diversion chamber 15 into the low - pressure intake hole 22, so as to enhance the suction force of the gas in the diversion chamber 15 into the air gap 6. And the end of the middle region to the connection between the intake hole 22 and the air gap 6 is divergent, so as to recover part of the static pressure. On the one hand, it can reduce the energy loss and avoid... On the other hand, in the divergent section (at the connection between the intake hole 22 and the air gap 6), the gas cross - section gradually increases, the flow velocity slows down, and the static pressure energy is restored. At this time, the gas has entered the intake hole 22 and is close to the air gap 6 and flows towards the air gap 6, so that the gas in the intake hole 22 flows into the air gap 6, that is, it drives the cooling air 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 around the stator group 2, during the movement of the cooling air in the intake hole 22 and the air gap 6, it will take away the heat of the stator group 2, the stator winding 3 and the rotor group 5. Therefore, through the structural design of the present invention, the stator group 2, the stator winding 3 and the rotor group 5 can be effectively cooled by heat dissipation; Continuing from the above, when dissipating heat from the regions of the air gap 6, stator assembly 2, stator winding 3, and rotor assembly 5 that are away from the intake fan 12, since the hot air at the air gap 6 converges into the cooling air within the diversion chamber 15, this will cause the temperature of the cooling air to rise. To avoid affecting the heat dissipation of the stator assembly 2, stator winding 3, and the end of the rotor assembly 5 that is away from the intake fan 12, in the present invention, a mounting frame 10 is fixedly installed on the outer wall of the machine body 1, and a tube body 101 filled with coolant is sleeved inside the mounting frame 10. When the gas in the diversion chamber 15 passes through the tube body 101, it will be cooled by the coolant inside the tube body 101, so that the temperature of the cooling air at the initial position of the diversion chamber 15 is relatively low. Subsequently, although it will mix with the hot air, it can still dissipate heat from the end of the stator assembly 2, stator winding 3, and rotor assembly 5 that is away from the intake fan 12. Since the stator assembly 2, stator winding 3, and rotor assembly 5 are made of metal materials (hereinafter, the stator assembly 2, stator winding 3, and rotor assembly 5 are replaced by metal materials), if the relatively low-temperature cooling air directly contacts the relatively high-temperature metal materials, it is likely to cause thermal stress, which will affect the strength of the metal materials over time. Furthermore, the mixing of the hot air and the cooling air can effectively reduce the temperature of the cooling air. On the one hand, the cooling air at an appropriate temperature can effectively cool the metal materials, and on the other hand, it also avoids the relatively low-temperature cooling air from affecting the metal materials. Therefore, through the structural design of the present invention, the heat dissipation and cooling of the interior of the machine body 1 can be effectively carried out, reducing the working energy consumption of the motor to achieve the purpose of energy conservation and extended service life.

[0021] It should be noted that in this article, relational terms such as first and second are only used 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 term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0022] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present 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) being fixedly connected to the output shaft (4) being disposed inside the rear cover (11), and characterized in that: A front cover (13) is fixedly mounted on one end of the machine body (1) away from the rear cover (11), and an exhaust fan (14) fixedly connected to the output shaft (4) is arranged inside the front cover (13). The air flow inside the machine body (1) is accelerated by the cooperation of the air inlet fan (12) and the exhaust fan (14). A flow guide chamber (15) is provided on the inner wall of the machine body (1), and the flow guide chamber (15) is communicated with the inside of the rear cover (11). One end of the flow guide chamber (15) is located at the stator winding (3) and An arc-shaped guide plate (7) is fixedly mounted on the inner wall of the body (1) and is located above the end of the stator winding (3) and away from the end of the inlet fan (12). The inlet fan (12) conveys cooling air to the arc-shaped guide plate (7) through a guide chamber (15), and under the guidance of the arc-shaped guide plate (7), heat is dissipated from the stator group (2), the stator winding (3) and the end of the rotor group (5) away from the inlet fan (12).

2. The cooling structure of an energy-saving electric motor according to claim 1, characterized in that: A plurality of flow diversion holes (16) are provided in the flow guide chamber (15), and a plurality of exhaust holes (21) and air inlet holes (22) connected to the flow diversion holes (16) are provided in the stator group (2). 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 flow diversion holes (16) is connected to the air gap (6). The cooling air in the flow guide chamber (15) enters the air inlet holes (22) through the flow 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 flow guide chamber (15) through the exhaust holes (21).

3. The cooling structure of an energy-saving electric motor according to claim 2, characterized in that: The diameter of the end of the exhaust hole (21) communicating with the air gap (6) is larger than the diameter of the end 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 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 region of the air inlet hole (22) is smaller than the aperture of the end communicating with the air gap (6).

4. The cooling structure of an energy-saving electric motor according to claim 3, characterized in that: 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).

5. 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 the end of the machine body (1) connected to the rear cover (11), and a plurality of air-permeable holes (18) are provided on the 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 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), wherein 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 a coolant 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 coolant in the tube body (101).

6. The cooling structure of an energy-saving electric motor according to claim 5, 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.

7. 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).

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

9. The cooling structure of an energy-saving electric motor according to claim 7, characterized in that: A plurality of guide plate frames (71) are fixedly mounted on the arc-shaped guide plate (7), and cooling air is used to dissipate heat from the stator group (2), the stator winding (3), and one end of the rotor group (5) away from the air 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 a bending area of ​​the stator winding (3).

10. 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 heat dissipation hole (131) at the air inlet end is larger than the diameter of the air outlet end.

Images