Three-phase asynchronous motor

Abstract

The application relates to the technical field of motors, and a three-phase asynchronous motor which comprises a motor shell, a rotating shaft, a rotor, a fan blade and a terminal box, the terminal box is connected to the outer wall of the motor shell, the terminal box is provided with a containing cavity on one side close to the motor shell, the containing cavity is used for placing circuit boards and other components, the motor shell is provided with a mounting cavity, the rotating shaft is coaxially and rotationally embedded in the mounting cavity, the rotor is coaxially connected to the outer periphery of the rotating shaft, the fan blade is connected to the rotor, the fan blade is provided with a plurality of fan blades which are uniformly distributed around the rotor axis, the mounting cavity wall is provided with a communication port, and the communication port is connected with the containing cavity. When the motor operates, the rotating shaft drives the rotor and the fan blade to rotate, airflow generated by the fan blade can suck the air in the containing cavity of the terminal box into the mounting cavity through the communication port, air flow in the containing cavity of the terminal box is realized, the circuit boards and other components in the containing cavity are cooled, the heat dissipation efficiency in the terminal box of the motor is improved, and the service life of the motor is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of electric motors, and in particular to a three-phase asynchronous motor. Background Technology

[0002] Three-phase asynchronous motors are a type of motor that is powered by a 380V three-phase AC power supply (with a phase difference of 120 degrees). Because the rotor and stator rotating magnetic fields of a three-phase asynchronous motor rotate in the same direction but at different speeds, there is slip, hence the name three-phase asynchronous motor.

[0003] A junction box is fixedly connected to the center of the top of the housing, a protective box is fixedly connected to the right side of the housing, and an end cover is fixedly connected to the left side of the housing. However, during use, this device can only dissipate heat from the rear end of the three-phase asynchronous motor by air cooling, which has a limited heat dissipation area and results in poor heat dissipation. Utility Model Content

[0004] To improve the heat dissipation efficiency inside the motor junction box, this application provides a three-phase asynchronous motor.

[0005] The three-phase asynchronous motor provided in this application adopts the following technical solution: A three-phase asynchronous motor includes a motor housing, a rotating shaft, a rotor, fan blades, and a junction box. The junction box is connected to the outer wall of the motor housing. The junction box has a receiving cavity on the side near the motor housing, which is used to place components such as circuit boards. The motor housing has a mounting cavity. The rotating shaft is coaxially rotatably embedded in the mounting cavity. The rotor is coaxially connected to the outer periphery of the rotating shaft. The fan blades are connected to the rotor. There are a plurality of fan blades, which are evenly distributed around the rotor axis. The mounting cavity wall has a connecting opening, which communicates with the receiving cavity.

[0006] By adopting the above technical solution, when the motor is running, the rotating shaft drives the rotor and fan blades to rotate. The airflow generated by the fan blades can draw the air in the receiving cavity of the junction box into the installation cavity through the connecting port, thereby realizing the air flow in the receiving cavity of the junction box, dissipating heat from the circuit boards and other components in the receiving cavity, improving the heat dissipation efficiency inside the motor junction box, and increasing the service life of the motor.

[0007] Preferably, the fan blades are directly opposite the connecting port.

[0008] By adopting the above technical solution, the distance from the connection port to the fan blade is reduced, the suction force on the air in the receiving cavity is increased, the air flow rate in the receiving cavity is increased, and the heat dissipation efficiency inside the motor junction box is improved.

[0009] Preferably, it also includes a wind deflector, which is coaxially connected to the outer periphery of the rotating shaft, and the wind deflector abuts against the end of the fan blade away from the rotor.

[0010] By adopting the above technical solution, the baffle, fan blades and shaft are transformed into a relatively sealed chamber, which can concentrate the air generated by the fan blades and allow the air in the containment chamber to stably enter the installation chamber through the connecting port, thereby improving the heat dissipation efficiency inside the motor junction box.

[0011] Preferably, the wind deflector is integrally stamped and formed, and the wind deflector protrudes to the side near the rotor to form a convex ring, which fits against the side of the fan blade near the rotating shaft.

[0012] By adopting the above technical solution, the outer wall of the convex ring and the side wall of the fan blade are closely fitted, which improves the stability of the connection between the baffle and the fan blade and enhances the reliability of the equipment.

[0013] Preferably, the rotor is provided with a plurality of through holes, which penetrate the rotor along the rotor axis and are distributed circumferentially around the rotor axis.

[0014] By adopting the above technical solution, the air in the housing cavity enters the mounting cavity through the connecting port, and is then transported to the other side of the rotor through the fan blades and through holes, thereby realizing the circulation of air in the mounting cavity and improving the overall heat dissipation effect of the motor.

[0015] Preferably, it also includes a cover plate, the bottom of the receiving cavity is provided with a mounting hole, the mounting hole is connected to the outside, and the cover plate is connected to the junction box and covers the mounting hole.

[0016] By adopting the above technical solution, the cover plate seals the mounting hole to prevent external objects from entering the receiving cavity and mounting cavity through the mounting hole and causing damage to the internal components of the motor. The cover plate can be removed as needed to facilitate the replacement or repair of the circuit board and improve the service life of the motor.

[0017] Preferably, the cover plate includes a connecting seat, a filter screen, and a mounting cover. The connecting seat is connected to the side of the junction box away from the motor housing. The side of the connecting seat away from the junction box has a cavity. The mounting cover is connected to the connecting seat and covers the cavity opening. The cavity wall has several air inlets, which are spaced apart along the circumference of the cavity. The bottom of the cavity has a connecting hole that communicates with the mounting hole. The filter screen is annular and embedded in the cavity. The connecting hole is located inside the filter screen.

[0018] By adopting the above technical solution, outside air enters the air intake, is filtered by the filter screen, and then enters the housing cavity. The outside air with a lower temperature replaces the air with a higher temperature inside the housing cavity, thereby improving the heat dissipation efficiency inside the motor junction box and extending the service life of the motor.

[0019] Preferably, the bottom of the cavity is provided with a first annular groove, and the surface of the mounting cover near the cavity is provided with a second annular groove, with both ends of the filter screen respectively embedded in the first annular groove and the second annular groove.

[0020] By adopting the above technical solution, the two ends of the filter screen are respectively embedded in the first annular groove and the second annular groove, which improves the stability of the connection between the filter screen, the connecting seat and the mounting cover.

[0021] Preferably, the connector has a protruding strip on the side near the junction box, the protruding strip is embedded in the mounting hole, and the side wall of the protruding strip fits against the wall of the mounting hole.

[0022] By adopting the above technical solution, the protrusion is embedded in the mounting hole, which improves the connection stability between the cover plate and the junction box.

[0023] Preferably, the connecting seat has a groove on the side away from the junction box, the mounting cover is embedded in the groove, the groove wall has a limiting groove, the side wall of the mounting cover is connected to a limiting block, the limiting block is rotatably embedded in the limiting groove, the rotation axis of the limiting block coincides with the axis of the mounting cover, the limiting groove has a connecting groove at one end along the groove axis, the connecting groove passes through the connecting seat on the side away from the junction box, and a plurality of scraper strips are connected to the side of the mounting cover near the cavity, the plurality of scraper strips are evenly distributed circumferentially around the axis of the mounting cover, the scraper strips are used to abut against the outer wall of the filter screen.

[0024] By adopting the above technical solution, when it is necessary to replace or clean the filter screen, rotate the mounting cover so that the limiting block is aligned with the connecting groove, and use the scraper to rotate around the filter screen to clean the outer wall of the filter screen, ensuring the ventilation effect of the filter screen and ensuring the heat dissipation efficiency of the motor junction box.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. When the motor is running, the shaft drives the rotor and fan blades to rotate. The airflow generated by the fan blades can draw the air in the receiving cavity of the junction box into the installation cavity through the connecting port, realizing the air flow in the receiving cavity of the junction box, dissipating heat from the circuit boards and other components in the receiving cavity, improving the heat dissipation efficiency inside the motor junction box, and extending the service life of the motor. 2. The baffle, fan blades and shaft are rotated into a relatively sealed chamber, which can concentrate the air generated by the fan blades and allow the air in the chamber to enter the mounting chamber stably through the connecting port, thereby improving the heat dissipation efficiency inside the motor junction box. 3. The air in the housing cavity enters the mounting cavity through the connecting port, and is then transported to the other side of the rotor through the fan blades and through holes, realizing the circulation of air in the mounting cavity and improving the overall heat dissipation effect of the motor. Attached Figure Description

[0026] Figure 1This is a schematic diagram of a three-phase asynchronous motor.

[0027] Figure 2 This is a partial sectional view of a three-phase asynchronous motor.

[0028] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0029] Explanation of reference numerals in the attached figures: 1. Motor body; 11. Motor housing; 111. Mounting cavity; 112. Connecting port; 12. Stator; 13. Rotor; 131. Through hole; 14. Shaft; 15. End plate; 16. Fan blade; 17. Baffle plate; 171. Protruding ring; 18. Junction box; 181. Receiving cavity; 182. Mounting hole; 183. Fixing hole; 2. Cover plate; 21. Connecting seat; 211. Connecting ring; 2111. Connecting hole; 212. Raised strip; 213. Cavity; 214. Communicating hole; 215. Embedded groove; 216. Limiting groove; 217. Communicating groove; 218. Air inlet; 219. First annular groove; 22. Filter screen; 23. Mounting cover; 231. Limiting block; 232. Second annular groove; 233. Scraper. Detailed Implementation

[0030] The present application will be further described in detail below with reference to the accompanying drawings.

[0031] Reference Figure 1 This application discloses a three-phase asynchronous motor including a motor body 1. The motor body 1 includes a motor housing 11, a stator 12, a rotor 13, and a rotating shaft 14. The motor housing 11 is provided with a mounting cavity 111, which extends through the motor housing 11 along its axis. The stator 12 is fixedly connected to the cavity wall of the mounting cavity 111. The rotating shaft 14 is coaxially rotatably embedded in the mounting cavity 111, and the rotation axis of the rotating shaft 14 coincides with the axis of the stator 12. Both ends of the rotating shaft 14 extend out of the mounting cavity 111. The rotor 13 is coaxially fixedly connected to the outer periphery of the rotating shaft 14.

[0032] Reference Figure 2The motor body 1 also includes an end plate 15 and fan blades 16. The end plate 15 is fixedly connected to one end of the rotor 13 along its axis. Two end plates 15 are provided, symmetrically distributed along the rotor 13 axis, and are annular in shape. The outer wall of the end plate 15 is flush with the outer wall of the rotor 13. The rotor 13 has several through holes 131 located inside the end plate 15, penetrating the rotor 13 along its axis. The through holes 131 are circumferentially spaced around the rotor 13 axis. In this embodiment, there are eighteen through holes 131, evenly distributed around the rotor 13 axis. One end of the fan blade 16 is fixedly connected to the surface of any end cover away from the rotor 13. The fan blade 16 is flush with the inner and outer side walls of the end cover along its two surfaces perpendicular to the rotor 13 axis. Several fan blades 16 are provided, evenly distributed around the rotor 13 axis. In this embodiment, there are eighteen fan blades 16.

[0033] The motor body 1 also includes a baffle plate 17, which is coaxially fixed to the outer periphery of the rotating shaft 14. The baffle plate 17 is annular, and the inside of the baffle plate 17 is in contact with the outer wall of the rotating shaft 14. The surface of the baffle plate 17 near the rotor 13 abuts against the end of the fan blade 16 away from the rotor 13. The baffle plate 17 is integrally stamped and formed. The baffle plate 17 protrudes to the side near the rotating shaft 14 to form a convex ring 171, which is in contact with the side surface of the rotating shaft 14 of the fan blade 16.

[0034] Reference Figure 1 and Figure 2 The motor body 1 also includes a junction box 18, which is fixedly connected to the outer wall of the motor housing 11. The junction box 18 has a receiving cavity 181 on the side near the motor housing 11. The receiving cavity 181 is used to place components such as circuit boards. The mounting cavity 111 has a connecting port 112 on its cavity wall. The connecting port 112 is connected to the receiving cavity 181 and is directly opposite to the fan blade 16.

[0035] Reference Figure 1 and Figure 3A three-phase asynchronous motor also includes a cover plate 2. A mounting hole 182 is provided at the bottom of the receiving cavity 181, communicating with the outside. The cover plate 2 is connected to the junction box 18 and covers the mounting hole 182. The cover plate 2 includes a connecting seat 21, a filter screen 22, and a mounting cover 23. The connecting seat 21 is fixedly connected to the surface of the junction box 18 away from the motor housing 11. A connecting ring 211 is fixedly connected to the outer periphery of the connecting seat 21. The outer wall of the connecting ring 211 is flush with the outer wall of the junction box 18. Four fixing holes 183 are provided on the side of the junction box 18 away from the motor housing 11, distributed at the four corners of the junction box 18. The connecting ring 211 has a connecting hole 2111 for a bolt to pass through and threadedly connect to the fixing hole 183. A protrusion 212 is fixedly connected to the surface of the connector 21 closest to the motor. The protrusion 212 is embedded in the mounting hole 182, and the side wall of the protrusion 212 fits against the side wall of the mounting hole 182. A cavity 213 is provided on the side of the connector 21 away from the junction box 18. A connecting hole 214 is provided at the bottom of the cavity 213, and the connecting hole 214 communicates with the mounting hole 182. A groove 215 is provided on the side of the connector 21 away from the junction box 18. A mounting cover 23 is embedded in the groove 215 and covers the opening of the cavity 213. A limiting groove 216 is provided on the groove wall of the groove 215. There are several limiting grooves 216, which are distributed at intervals along the circumference of the mounting groove. In this embodiment, there are three limiting grooves 216, which are evenly distributed along the circumference of the mounting groove. Limiting blocks 231 are fixedly connected to the side wall of the mounting cover 23. The number of limiting blocks 231 is the same as the number of limiting grooves 216 and they correspond one-to-one. The limiting blocks 231 are rotatably embedded in the limiting grooves 216. The rotation axis of the limiting blocks 231 coincides with the axis of the mounting cover 23. A connecting groove 217 is provided at one end of the limiting groove 216 along the axis of the recess 215. The connecting groove 217 is located at one end of the limiting groove 216 along the axis of the mounting groove. The side of the connecting groove 217 away from the junction box 18 passes through the connecting seat 21. Several air inlets 218 are provided on the cavity wall of the cavity 213. The air inlets 218 are distributed at intervals along the circumference of the cavity 213. The cavity 213 has a first annular groove 219 at its bottom, and a connecting hole 214 is located inside the first annular groove 219. The axis of the connecting hole 214 coincides with the axis of the first annular groove 219. The mounting cover 23 has a second annular groove 232 on its surface near the cavity 213. The filter screen 22 is embedded in the cavity 213 and is annular in shape. Both ends of the filter screen 22 are respectively embedded in the first annular groove 219 and the second annular groove 232. Several scraper strips 233 are fixedly connected to the surface of the mounting cover 23 near the cavity 213. The scraper strips 233 are evenly distributed circumferentially around the axis of the mounting cover 23 and are used to abut against the outer wall of the filter screen 22. In this embodiment, there are six scraper strips 233.

[0036] The implementation principle of a three-phase asynchronous motor in this application embodiment is as follows: When the motor is running, the rotating shaft 14 rotates, which drives the rotor 13 to rotate, drives the end cover to rotate, and drives the fan blade 16 to rotate, so that outside air enters the cavity 213 from the air inlet 218. After being filtered by the filter screen 22, the air enters the receiving cavity 181 through the connecting hole 214 and the mounting hole 182, which cools the circuit board and other components in the receiving cavity 181. The air enters the mounting cavity 111 through the connecting port 112, and then cools the entire motor through the through hole 131.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A three-phase asynchronous motor, characterized in that: The device includes a motor housing (11), a rotating shaft (14), a rotor (13), fan blades (16), and a junction box (18). The junction box (18) is connected to the outer wall of the motor housing (11). The junction box (18) has a receiving cavity (181) on the side near the motor housing (11). The receiving cavity (181) is used for placing components. The motor housing (11) has an installation cavity (111). The rotating shaft (14) is coaxially rotatably embedded in the installation cavity (111). The rotor (13) is coaxially connected to the outer circumference of the rotating shaft (14). The fan blades (16) are connected to the rotor (13). There are several fan blades (16). The several fan blades (16) are evenly distributed around the axis of the rotor (13). The wall of the installation cavity (111) has a connecting port (112). The connecting port (112) is connected to the receiving cavity (181).

2. The three-phase asynchronous motor according to claim 1, characterized in that: The fan blade (16) is directly opposite the connecting port (112).

3. The three-phase asynchronous motor according to claim 2, characterized in that: It also includes a wind deflector (17); the wind deflector (17) is coaxially connected to the outer periphery of the rotating shaft (14); the wind deflector (17) abuts against the end of the fan blade (16) away from the rotor (13).

4. The three-phase asynchronous motor according to claim 3, characterized in that: The baffle plate (17) is integrally stamped; the baffle plate (17) protrudes to the side near the rotor (13) to form a convex ring (171); the convex ring (171) fits against the side of the fan blade (16) near the rotating shaft (14).

5. The three-phase asynchronous motor according to claim 1, characterized in that: The rotor (13) is provided with a plurality of through holes (131); the through holes (131) penetrate the rotor (13) along the axis of the rotor (13); the plurality of through holes (131) are circumferentially distributed around the axis of the rotor (13).

6. The three-phase asynchronous motor according to claim 1, characterized in that: It also includes a cover plate (2); the bottom of the receiving cavity (181) is provided with a mounting hole (182); the mounting hole (182) is connected to the outside; the cover plate (2) is connected to the junction box (18) and covers the mounting hole (182).

7. The three-phase asynchronous motor according to claim 6, characterized in that: The cover plate (2) includes a connecting seat (21), a filter screen (22), and a mounting cover (23); the connecting seat (21) is connected to the side of the junction box (18) away from the motor housing (11); the side of the connecting seat (21) away from the junction box (18) is provided with a cavity (213); the mounting cover (23) is connected to the connecting seat (21) and covers the cavity (213) opening; the cavity (213) wall is provided with a plurality of air inlets (218); the plurality of air inlets (218) are distributed at intervals along the circumference of the cavity (213); the cavity (213) bottom is provided with a connecting hole (214); the connecting hole (214) is connected to the mounting hole (182); the filter screen (22) is annular; the filter screen (22) is embedded in the cavity (213); the connecting hole (214) is located inside the filter screen (22).

8. The three-phase asynchronous motor according to claim 7, characterized in that: The cavity (213) has a first annular groove (219) at the bottom; the mounting cover (23) has a second annular groove (232) on the side surface near the cavity (213); the two ends of the filter screen (22) are respectively embedded in the first annular groove (219) and the second annular groove (232).

9. The three-phase asynchronous motor according to claim 7, characterized in that: The connector (21) has a protrusion (212) connected to the side of the junction box (18); the protrusion (212) is embedded in the mounting hole (182); the side wall of the protrusion (212) is in contact with the wall of the mounting hole (182).

10. The three-phase asynchronous motor according to claim 7, characterized in that: The connecting seat (21) has a groove (215) on the side away from the junction box (18); the mounting cover (23) is embedded in the groove (215); the groove wall of the groove (215) has a limiting groove (216); the side wall of the mounting cover (23) is connected to a limiting block (231); the limiting block (231) is rotatably embedded in the limiting groove (216); the rotation axis of the limiting block (231) coincides with the axis of the mounting cover (23); the limiting groove (216) has a connecting groove (217) at one end along the axis of the groove (215); the connecting groove (217) passes through the connecting seat (21) on the side away from the junction box (18); the mounting cover (23) is connected to a number of scrapers (233) on the side near the cavity (213); the number of scrapers (233) are evenly distributed around the axis of the mounting cover (23); the scrapers (233) are used to abut against the outer wall of the filter screen (22).

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