A box-type asynchronous motor

Abstract

This invention discloses a box-type asynchronous motor, including a frame, cooling equipment, ventilation equipment, and a rotor and stator within the frame. The rotor is rotatably connected to the frame at both its front and rear ends. The rotor includes a rotor shaft and several sets of magnets. The rotor shaft is a planed shaft, and wind-blocking devices are arranged between adjacent shaft ribs on the planed shaft. Several wind-blocking devices are staggered along the axial direction of the planed shaft. This invention effectively improves the strength of the motor and suppresses noise, thereby achieving low vibration and low noise effects.

Description

Technical Field

[0001] This invention relates to an electric motor, and more particularly to a box-type asynchronous motor. Background Technology

[0002] Asynchronous motors have been widely used in various industrial production processes in my country. Asynchronous motors generate electromagnetic torque through the interaction between the rotating magnetic field in the air gap and the induced current in the rotor windings, thereby converting electromechanical energy into mechanical energy.

[0003] Current high-speed, high-capacity box-type asynchronous motors generally suffer from problems such as high vibration, high noise, and weak overall strength, while their heat dissipation performance also needs improvement. How to solve these problems has been a subject of ongoing research for motor manufacturers. Furthermore, to meet overall strength requirements, some motor manufacturers commonly use thicker sheet metal for the frame and stator core in the manufacturing of high-speed, high-capacity box-type asynchronous motors. This design approach not only increases material consumption but also fails to guarantee improved motor strength and vibration suppression. Summary of the Invention

[0004] The purpose of this invention is to provide a box-type asynchronous motor that can effectively improve the strength and heat dissipation of the motor.

[0005] The present invention adopts the following technical solution: A box-type asynchronous motor includes a frame, cooling equipment, ventilation equipment, and a rotor and stator inside the frame. The front and rear ends of the rotor are rotatably connected to the frame. The rotor includes a rotor shaft and a rotor core. The rotor shaft is a planer shaft. A wind-blocking device is provided between two adjacent shaft ribs on the planer shaft. Several wind-blocking devices are staggered along the axial direction of the planer shaft.

[0006] The wind deflector is adapted to the spatial shape between two adjacent ribs, and the outer end of the wind deflector does not protrude beyond the circumference of the rib shaft.

[0007] The bar planer shaft is made of high-strength alloy steel.

[0008] The windbreak device is connected to the corresponding side axial reinforcement bolts by welding components on both sides.

[0009] After the wind deflector and its welding components are welded together, they undergo stress relief treatment before being assembled with the shaft reinforcement.

[0010] Several sets of reinforcing ribs are provided along the axial direction on the base.

[0011] Several sets of reinforcing ribs are provided along the axial direction on the end plates and partitions of the machine base, and several sets of reinforcing ribs are provided along the axial direction on the side plates of the machine base.

[0012] The inner wall of the base is lined with noise-reducing material.

[0013] The noise reduction material is installed on the inner wall of the base through a fixed protective device.

[0014] The ventilation system uses a dual-suction fan.

[0015] This invention combines a high-strength alloy steel ribbed shaft with a wind deflector, effectively increasing the strength of the motor shaft and improving the heat dissipation of the airflow zones. Furthermore, the design and use of the wind deflector's welded components overcome the difficulty of welding high-strength alloy steel rotor shafts, making the assembly of the wind deflector more convenient and stable. This invention also increases the overall strength of the motor while reducing overall motor noise by adding several axial reinforcing ribs to the base. Finally, this invention utilizes a high-efficiency dual-suction fan to further reduce motor noise while meeting airflow requirements, ultimately achieving a low-vibration, low-noise effect for a high-speed, high-power motor. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a schematic diagram of the main structure of the base in this invention; Figure 4 This is a side view of the base structure in this invention; Figure 5 This is a schematic diagram of the rotor shaft in this invention; Figure 6 for Figure 5 A magnified structural diagram of part A in the middle; Figure 7 This is a schematic diagram of the windbreak device in the present invention; Figure 8 This is a schematic diagram of the mounting plate in this invention; Figure 9 This is a schematic diagram showing the installation positions of the windbreak device and the rotor shaft; Figure 10 This is a schematic diagram of the dual-suction fan in this invention. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] like Figures 1 to 10As shown, the box-type asynchronous motor of the present invention includes a frame 1, a rotating assembly inside the frame 1, a cooling device 2 above the frame 1, and a ventilation device 3 on one side of the frame 1; the rotating assembly includes a rotor 4 and a stator 5, and the front and rear ends of the rotor 4 are rotatably connected to the frame 1 through sliding bearings 6 respectively. The rotor 4 includes a rotor shaft 7 and a copper bar rotor core 8 evenly distributed on the outer surface of the rotor shaft 7 along the circumference. The rotor shaft 7 is a planed shaft. A wind-blocking device 10 is provided in the space between two adjacent shaft ribs 9 on the planed shaft. Several wind-blocking devices 10 are staggered along the axial direction of the planed shaft. The stator 5 includes a fixed winding 25.

[0019] In this invention, the planer shaft is made by uniformly machining several grooves along the axial direction on the circumferential surface of a solid shaft using a planer. The protrusion formed between two adjacent grooves is the rib 9 of the planer shaft.

[0020] In this invention, the wind deflector 10 is adapted to the spatial shape between two adjacent ribs 9, and the height of the wind deflector 10 along the radial direction of the rib shaft does not protrude beyond the circumferential surface of the rib shaft, that is, the outer end of the wind deflector 10 does not protrude beyond the circumferential surface of the rib shaft.

[0021] Example 1: In this embodiment, the planing shaft is made of high-strength alloy steel; the wind deflector 10 is a metal wind deflector plate, and the outermost surface of the wind deflector plate in the radial direction of the planing shaft is an arc surface that matches the outer circumference of the planing shaft.

[0022] Since the planing shaft made of high-strength alloy steel is difficult to weld, a special welding assembly for the windbreak device is provided in this invention to facilitate the assembly of the planing shaft and the windbreak device 10.

[0023] The windbreak device welding assembly includes a mounting plate 11 that is bolted to the shaft rib 9 of the planer shaft. The two sides of the windbreak device 10 are welded to the mounting plates 11 on the corresponding sides, and finally assembled between two adjacent shaft ribs 9 to achieve the windbreak effect.

[0024] Example 2: In this embodiment, the mounting plate 11 is a rectangular metal part with two mounting holes. Each wind deflector 10 is used in conjunction with four mounting plates 11. That is, each side rib 9 adjacent to the wind deflector 10 is provided with four sets of mounting holes. Two mounting plates 11 are set on one side surface of the corresponding rib 9 through the four sets of mounting holes and bolts, and the interval between the two mounting plates 11 is adapted to the thickness of the wind deflector 10. The two sides of the wind deflector 10 are respectively welded to the two mounting plates 11 on the corresponding side rib 9.

[0025] Considering that residual stress may have a negative impact on the strength, rigidity, and dimensional stability of the weldment, in this invention, the windbreak device 10 and the mounting plate 11 are assembled with the planer shaft after the welding stress is relieved.

[0026] In this embodiment, the assembly process of the windbreak device 10 and the planer shaft is as follows: A: Two sets of threaded holes are machined at the set positions of two adjacent ribs 9; the number and position of the threaded holes in each set of threaded holes are adapted to the mounting plate 11, and the axial spacing of the two sets of threaded holes in the planer shaft is adapted to the thickness of the windproof device 10. B: Install two sets of mounting plates 11 on each rib 9 using two sets of threaded holes and bolts; then insert the wind deflector 10 between the two sets of ribs 9, with both sides of the wind deflector 10 located between the two mounting plates 11 on the corresponding side ribs 9; after adjusting the positions of the wind deflector 10 and the mounting plates 11, connect the wind deflector 10 and the corresponding four mounting plates 11 by spot welding.

[0027] C: Remove the welded windbreak device 10 and the corresponding 4 mounting plates 11 from the shaft rib 9, re-weld them around the perimeter, and then perform welding stress relief treatment. D: The windbreak device 10 and four mounting plates 11, which have undergone welding stress relief treatment, are reinstalled between the two axial ribs 9 using bolts.

[0028] E: Install the next windbreak device 10 according to the above scheme; and ensure that several windbreak devices 10 are staggered along the axial direction of the planer shaft.

[0029] In this invention, the high-strength alloy steel rotor shaft 7 and the wind deflector 10 effectively enhance the strength of the motor shaft and overcome the difficulty of welding the high-strength alloy steel rotor shaft 7. Simultaneously, the wind deflector 10 further improves the heat dissipation effect of the airflow partition, allowing the airflow entering between two adjacent shaft ribs 9 through the dual suction fans 23 on both sides to flow radially outward under the action of the wind deflector 10, thereby preventing turbulence after airflow convergence.

[0030] To further improve the strength of the base 1, this invention also adds several axial reinforcing ribs to the base 1; compared with conventional base structures without any reinforcing ribs, this invention can both increase the overall strength of the motor and reduce the overall noise of the motor through a stable connection structure. Specifically: In this embodiment, the base 1 is composed of base end plates 13 on the left and right sides, base side plates 14 on the front and rear sides, and top and bottom plates 15 and bottom plates 16 on the upper and lower sides. Several sets of partitions 17 are arranged axially inside the base 1. Several sets of reinforcing square ribs 18 are added axially on the base end plates 13 and partitions 17, and several sets of reinforcing flat ribs 19 are added axially on the base side plates 14, thereby forming an axial square cavity 20 together with the base side plates 14, base end plates 13 and base 1 partitions 17, further improving the strength of the base 1.

[0031] In this invention, to further enhance the noise reduction effect, a noise-reducing material 21 is also provided on the inner wall of the base 1 to absorb the noise generated during the operation of the motor. The noise-reducing material 21 can be sound-absorbing cotton, sound-absorbing board, or other noise-reducing materials.

[0032] In this embodiment, the noise reduction material 21 is sound-absorbing cotton, which is laid on the side plate 14 of the base, the end plate 13 of the base, and the partition plate 17 of the base 1 to form the inner wall of the axial square cavity 20. In order to ensure the service life and positional stability of the noise reduction material 21, in this embodiment, a fixing protection device 22 is provided on the outer surface of the noise reduction material 21. The fixing protection device 22 can be a metal perforated plate, and the metal perforated plate is fixed to the inner wall of the base 1.

[0033] In this invention, the cooling device 2 uses a cooler, which is conventional technology in the field and will not be described in detail here. The ventilation device 3 is used to realize heat exchange between the inside and outside of the base 1, that is, to realize the circulation between the hot air generated inside the base 1 and the cold air outside the base 1. Because the high-speed, high-capacity box-type asynchronous motor has high motor power, high speed, and requires a large motor air volume, the existing conventional single-suction fan has a large outer diameter, resulting in high noise during rotation. In this invention, the ventilation device 3 uses a small outer diameter double-suction fan 23 to replace the existing single-suction fan, which can not only meet the air volume requirements, but also effectively reduce the outer diameter of the fan 24 and reduce the noise generated by the fan 24 when rotating at high speed.

[0034] This invention, through the combination of a high-strength alloy steel planed shaft and a wind deflector 10, effectively enhances the strength of the motor shaft and improves the heat dissipation effect of the airflow zones. Furthermore, the design and use of the wind deflector's welding components overcome the difficulty of welding the four shafts of the high-strength alloy steel rotor, making the assembly of the wind deflector 10 more convenient and stable. This invention also increases the overall strength of the motor and reduces its overall noise by adding several axial reinforcing ribs 12 to the base 1. Finally, this invention utilizes a high-efficiency dual-suction small-diameter fan 24 to further reduce motor noise while meeting airflow requirements, ultimately achieving a low-vibration, low-noise effect for a high-speed, high-power motor.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A box-type asynchronous motor, comprising a frame, cooling equipment, ventilation equipment, and a rotor and stator within the frame, wherein the front and rear ends of the rotor are rotatably connected to the frame, characterized in that: The rotor includes a rotor shaft and a rotor core. The rotor shaft is a planer shaft, and a wind-blocking device is provided between two adjacent shaft ribs on the planer shaft. Several wind-blocking devices are staggered along the axial direction of the planer shaft.

2. The box-type asynchronous motor according to claim 1, characterized in that: The wind deflector is adapted to the spatial shape between two adjacent ribs, and the outer end of the wind deflector does not protrude beyond the circumference of the rib shaft.

3. The box-type asynchronous motor according to claim 1, characterized in that: The bar shaping shaft is made of high-strength alloy steel.

4. The box-type asynchronous motor according to claim 1, characterized in that: The windbreak device is connected to the corresponding side axial reinforcement bolts by welding components on both sides.

5. The box-type asynchronous motor according to claim 4, characterized in that: After the wind deflector and its welding components are welded together, they undergo stress relief treatment before being assembled with the shaft reinforcement.

6. The box-type asynchronous motor according to claim 1, characterized in that: Several sets of reinforcing ribs are provided along the axial direction on the base.

7. The box-type asynchronous motor according to claim 6, characterized in that: Several sets of reinforcing ribs are provided along the axial direction on the end plates and partitions of the machine base, and several sets of reinforcing ribs are provided along the axial direction on the side plates of the machine base.

8. The box-type asynchronous motor according to claim 1, characterized in that: The inner wall of the base is lined with noise-reducing material.

9. The box-type asynchronous motor according to claim 8, characterized in that: The noise reduction material is installed on the inner wall of the base through a fixed protective device.

10. The box-type asynchronous motor according to claim 1, characterized in that: The ventilation system uses a dual-suction fan.

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