WO2021196405A1

WO2021196405A1 - Air cooling structure of outer rotor electric roller

Info

Publication number: WO2021196405A1
Application number: PCT/CN2020/095531
Authority: WO
Inventors: 张春晖; 李文龙
Original assignee: 江苏嘉轩智能工业科技股份有限公司
Priority date: 2020-04-01
Filing date: 2020-06-11
Publication date: 2021-10-07
Also published as: CN111130266B; CN111130266A

Abstract

Disclosed is an air cooling structure of an outer rotor electric roller, comprising: a fixing base (27), an end cap assembly, and a stator assembly. The stator assembly comprises a stator sleeve (1), axial rib plates (4), an air deflector structure, a bearing seat (3), a main shaft (9), and a stator coil and iron core component (12); the air deflector structure is connected to the axial rib plates (4) and the main shaft (9), separately; the axial rib plates (4) are respectively connected to the bearing seat (3), the stator sleeve (1), and the main shaft (9); air inlet and outlet passages are arranged on the fixing base (27); air inlet and outlet ports are arranged on the end cap assembly. According to the present invention, a ventilation duct is formed among the stator sleeve (1), the air deflector structure, and the axial rib plates (4) outside the shaft; a fan provided on one end of the main shaft (9) passes the cooling airflow through the fixing base (27) and the end cap assembly, delivers same into the ventilation duct to cool a stator iron core, and then passes same through the ventilation duct outside the shaft. The amount of cooling air flow entering a stator is increased, and the heat-dissipation effect is enhanced, thereby effectively prolonging the service life of the electric roller.

Description

Air-cooled structure of outer rotor electric drum

Technical field

The invention relates to the technical field of electric transmission systems, and more specifically, to an air-cooled structure of an outer rotor electric drum.

Background technique

The outer rotor electric drum has the advantages of simple structure, reliable operation, low loss, high efficiency, and can realize direct drive control. It is especially suitable for low-speed and high-torque applications. Therefore, it is widely used in petroleum, mining, metallurgical steel rolling and other industries. When the outer rotor electric drum is working, the coil installed on the stator will generate a lot of induction heat, which will easily lead to the aging of the motor and affect the service life of the outer rotor electric drum. In order to improve the heat dissipation capacity of the outer rotor electric drum, reasonable cooling is adopted. The system is very necessary to control the temperature rise of the outer rotor electric drum, so the equipment needs to be cooled. In the prior art, when the external rotor electric drum is cooled, most of the water-cooled form is adopted, and a small part of the external-rotor electric drum is air-cooled.

In Chinese patent CN101944813A, an outer rotor direct-drive permanent magnet synchronous motor for belt conveyors is disclosed, which adopts an air-cooled/water-cooled structure as the cooling structure of the outer-rotor electric drum. This kind of outer rotor electric drum adopts a rotating shaft with a front shaft hole and a rear shaft hole. The rotating shaft is fixed on a bracket, and the rotating shaft is provided with air inlet or water holes and exhaust air or water holes. That is, the air enters the center hole inside the rotating shaft for cooling, and then the air exits from the center hole at the other end of the rotating shaft.

The Chinese patent CN106451915A discloses an outer rotor permanent magnet motor stator, which adopts an air-cooled structure as the cooling structure of the outer rotor electric drum. This kind of external rotor permanent magnet motor includes a hollow shaft, a stator support arranged on the hollow shaft, and a stator core and a stator coil arranged on the stator support. Radial air outlet to the air inlet and hollow shaft. The air enters the hollow shaft, and the other end of the hollow shaft emits air.

When the above-mentioned cooling structure drum is designed as a water-cooled structure, additional water-cooling equipment is required. On-site installation takes up a lot of space. The water-cooling equipment and pipe joints require manpower and material resources for regular maintenance. The manufacturing cost of the equipment itself is also high. At the same time, air-cooling technology The small air inlet of the hollow shaft hole results in a small air flow, and the shaft hole is far away from the heating part of the motor stator. The heat transfer is slow, and it is difficult to dissipate heat in time. In addition, the wind resistance flowing into the stator from the shaft radial hole is relatively large, requiring high-pressure air. The installation site is often restricted by conditions.

Summary of the invention

The purpose of the present invention is to solve the above-mentioned problems and provide an air-cooled structure of the outer rotor electric drum with large air flow, good heat dissipation effect, and small required air pressure.

The technical solutions provided include:

In the air-cooled structure of the outer rotor electric drum of the present invention, it includes a fixing base 27, a stator assembly and an end cover assembly. The fixing base 27 is connected to the stator assembly, and the stator assembly is connected to the stator assembly. The end cover assembly is connected, the stator assembly includes a stator sleeve 1, an axial rib 4, a wind deflector structure, a main shaft 9, and a bearing seat 3. The stator sleeve 1 is connected with the axial rib 4 , The axial ribs 4 are connected to the wind deflector structure, the wind deflector structure is connected to the main shaft 9, the main shaft 9 is connected to the bearing housing 3, and the bearing housing 3 is distributed in the stator sleeve 1, the wind deflector structure is located between the stator sleeve 1 and the main shaft 9, the wind deflector structure is respectively connected to two adjacent axial ribs 4, the wind deflector The structure and the stator sleeve 1 form an air passage outside the main shaft 9, and the inside of the fixing seat 27 communicates with the air passage.

In the air-cooled structure of the outer rotor electric drum of the present invention, a heat dissipation rib 2 is arranged on the inner ring of the stator sleeve 1, and the heat dissipation rib 2 runs along the circumference of the inner ring of the stator sleeve 1. Evenly distributed.

In the air-cooled structure of the outer rotor electric drum of the present invention, the fixed seat 27 includes an intermediate sleeve 26, an axial support rib 22, and a fixed outer ring 24. The intermediate sleeve 26 is connected to the main shaft 9 The axial support ribs 22 are respectively fixedly connected to the fixed outer ring 24 and the intermediate shaft sleeve 26, and are evenly distributed along the circumference of the intermediate shaft sleeve 26. The axial support ribs 22, the intermediate shaft An air inlet and outlet port 23 is formed between the sleeve 26 and the fixed outer ring 24.

In the air-cooled structure of the outer rotor electric drum of the present invention, the stator assembly includes a bearing seat 3, the outer ring of the bearing seat 3 is in a stepped shape, the inner ring is chamfered, and the chamfer angle is 5 °-45°.

In the air-cooled structure of the outer rotor electric drum of the present invention, the end cover assembly includes an end cover 15, an oil cover assembly, a bearing 17, and a sealing device. The two ends of the stator sleeve 1 and the outer ring of the bearing seat 3 Welding, the inner ring of the bearing seat 3 and the axial rib 4 are welded, and a plurality of air inlets and outlets are formed between the inner ring of the bearing seat 3, the axial rib 4 and the shaft sleeve 7.

In the air-cooled structure of the outer rotor electric drum of the present invention, the axial rib 4 and the main shaft 9 are fixedly connected by a sleeve 7, and the axial rib 4 is welded to the sleeve 7, and It is evenly distributed along the circumference of the outer ring of the sleeve 7, and the sleeve 7 is fixed on the main shaft 9 by means of interference fit or keyway connection.

In the air-cooled structure of the outer rotor electric drum according to the present invention, the axial rib 4 and the main shaft 9 are directly welded.

In the air-cooled structure of the outer rotor electric drum of the present invention, the wind deflector structure includes a plurality of first wind deflectors 5, and the first wind deflectors 5 are respectively located at the front and rear ends of the main shaft 9, so The shape of the first wind deflector 5 is a fan shape, and a plurality of first wind deflectors 5 are arranged in a ring shape on the main shaft 9, and the front end of the first wind deflector 5 is connected to the main shaft 9 and is respectively welded to the two On the adjacent axial ribs 4, the first air guide plates 5 are evenly distributed along the circumference of the outer ring of the main shaft 9, and are opposed to the air inlet and outlet one by one.

In the air-cooled structure of the outer rotor electric drum according to the present invention, the wind deflector structure further includes a second wind deflector 6, and the cross section of the second wind deflector 6 is in the shape of an arc. The two air guide plates 6 are respectively welded to the rear ends of the first air guide plate 5 at both ends of the main shaft 9, and the two side ends of the second air guide plate 6 are respectively welded to two adjacent axial ribs 4, The second wind deflector 6 is evenly distributed along the circumference of the outer ring of the main shaft 9 and is opposite to the first wind deflector 5 one by one.

The beneficial effects of the present invention are:

1. The use of air-cooled structure directly reduces the corresponding water-cooled equipment, eliminates the maintenance of water-cooled joints and equipment in the later stage, saves manufacturing costs and saves energy;

2. The large-aperture bearing 17 is adopted, and its aperture is directly used as the air inlet, the air inlet space is greatly increased, and the cooling air flow into the stator is increased;

3. Adopt the guide plate structure to make the inlet air flow more stable, and more effectively contact with the inner ring of the stator sleeve 1 and the heat dissipation rib 2 for heat exchange, which greatly improves the heat dissipation effect, thereby prolonging the service life of the electric drum, and reducing the air intake. The demand of wind pressure is not restricted by high-pressure wind, and ordinary fans can be used.

Description of the drawings

Figure 1 is a cross-sectional view of the air-cooled structure of the present invention

Figure 2 is the left side view of the air-cooled structure of the present invention

Figure 3 is a cross-sectional view of the axial stiffener plate of the present invention

Fig. 4 is a schematic diagram of the structure of the circular truncated cone formed by the first wind deflector of the present invention

Figure 5 is a front view of the end cap assembly of the present invention

Figure 6 is the A-A cross-sectional view of the end cap assembly of Figure 5

Figure 7 is a schematic diagram of the structure of the end cap of the present invention

Figure 8 is a schematic diagram of the structure of the fixing seat of the present invention

Figure 9 is a schematic view of the cylindrical structure of the second wind deflector of the present invention

Stator sleeve 1, heat dissipation ribs 2, bearing seat 3, axial ribs 4, first air deflector 5, second air deflector 6, shaft sleeve 7, flat key 8, main shaft 9, lock nut 10, Threading pipe 11, stator coil core assembly 12, outer oil cover 13, first sealing ring 14, end cover 15, end cover mounting hole 15.1, second sealing ring 16, bearing 17, inner oil cover 18, screw plug 19, Rotating shaft lip seal ring 20, oil nozzle 21, oil nozzle through hole 21.1, axial support rib 22, air duct opening 23, fixed outer ring 24, hanging hole 25, intermediate sleeve 26, fixed seat 27, wind direction 28, fixed The mounting hole 29, the contact surface a between the axial rib and the bearing seat, the contact surface b between the axial rib and the stator sleeve, and the contact surface c between the axial rib and the shaft sleeve.

Detailed ways

The description will be described in detail below in conjunction with the drawings:

As shown in Figures 1-8, the present invention includes a fixing base 27, an end cover assembly, and a stator assembly. The fixed seat 27 includes an intermediate shaft sleeve 26, an axial support rib 22, and a fixed outer ring 24. The end cover assembly includes an end cover 15, an oil cover assembly, a bearing 17, and a sealing device. The stator assembly includes a stator sleeve 1, an axial Rib 4, wind deflector structure, bearing seat 3, main shaft 9, stator coil iron core assembly 12. The fixed seat 27 is fixed together by a key connection or a thermal sleeve between the intermediate shaft sleeve 26 and the main shaft 9. The stator assembly and the end cover assembly are welded together with the outer ring of the bearing seat 3 through the stator sleeve 1.

As shown in FIG. 8, in a preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, the fixing base 27 can be integrally cast or wire-cut, or welded by various component structures.

In the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, the fixing seat 27 fixes the drum main shaft 9 through the intermediate shaft sleeve 26, and preferably 6 axial support ribs 22 are respectively attached to the fixed outer ring 24 and the intermediate shaft sleeve. 26 are fixed together, and the 6 axial support ribs 22 are evenly distributed along the circumference of the intermediate bushing 26. The intermediate bushing 26, the axial support ribs 22 and the fixed outer ring 24 form 6 equally divided winds. Level 23.

In the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, threaded holes are provided on the front and rear planes of the fixed outer ring 24 for installing the fan cover and the connecting cover, and fixed installations are provided on the extension ends on the left and right sides respectively. Hole 29 to fix the fixing seat 27.

In a preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, the fixed outer ring 24 is provided with a hanging hole 25, which is located above the fixed outer ring 24, and is used to install a hoisting device to facilitate hoisting.

In the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, the cooling air flow generated by the fan enters or exits from the air duct opening 23 on the fixing seat 27, which ensures the fixing function of the original fixing seat 27 and increases the corresponding The air duct opening 23 improves the fluency of ventilation and ensures the heat dissipation effect of the outer rotor electric drum, which is more suitable for fixing the outer rotor electric drum with an air-cooled structure.

As shown in Figures 5-7, in the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, the bearing 17 in the end cover assembly adopts a large-diameter hole bearing 17, preferably a deep groove ball bearing with an inner diameter greater than 400 17.

In the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, the end cover 15 is tightly fitted to the outer ring of the bearing 17 by means of a heat sleeve or a bearing press machine to directly press the bearing 17 into the end cover 15.

In the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, the oil cap assembly includes an outer oil cap 13 and an inner oil cap 18. The outer oil cap 13 is fixed to one side of the end cap 15 by a fastener and is provided with a seal. In the device, the inner hole of the outer oil cover 13 is equipped with a rotary shaft lip seal 20 to ensure its sealing performance. At the same time, the outer oil cover 13 is provided with a number of counterbore holes that are evenly distributed along the outer circumference of the outer oil cover 13 for use The oil nipple 21 and the screw plug 19 are installed; the inner oil cap 18 is installed on the other side of the end cap 15 by fasteners and is provided with a sealing device. The inner oil cap 18 has oil grooves evenly distributed in the circumferential direction for oil filling.

In a preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, the sealing device includes a first sealing ring 14 and a second sealing ring 16. The first sealing ring 14 is used to ensure that the outer oil cover 13 and the end cover 15 The second sealing ring 16 is used to ensure the sealing performance between the inner oil cover 18 and the end cover 15.

In the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, the end cover 15 is in the shape of a stepped flange, and its outer side is evenly provided with end cover mounting holes 15.1 along the circumferential direction for fixing with the outer rotor electric drum Connected, the inner side is provided with a through hole 21.1 for the oil nozzle along the circumference to communicate with the oil groove of the inner oil cap 18, so that a circuit is formed between the oil nozzle 21 and the screw plug 19.

In the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, the outer ring of the bearing seat 3 is in a stepped shape, and the inner hole is chamfered. The length and channel size are adjusted, and the chamfer angle is preferably 35°, which plays a role of guiding the wind.

In the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, the bearing seat 3 is welded with the axial rib 4 at the contact surface a between the axial rib and the bearing seat, and the axial rib 4 is connected to the shaft sleeve. 7 Weld at the contact surface c between the axial ribs and the shaft sleeve respectively. The preferred number of axial ribs 4 is 6 and they are evenly distributed along the circumference of the shaft sleeve 7. The shaft sleeve 7, the axial ribs 4 and Six equally divided air inlets and outlets are formed between the bearing seats 3 and correspond to the air duct openings 23 of the fixed seat 27 one by one.

In the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, the axial rib 4 can also be directly welded to the main shaft 9.

In the preferred embodiment of the air-cooled structure of the outer-rotor electric drum of the present invention, the bearing 17, the end cover 15, and the oil cap assembly are integrated, and are directly installed on the bearing seat 3 of the outer-rotor electric drum adopting the air-cooled structure. There is enough space for the air inlet and outlet inside the seat 3.

As shown in Figures 1-4, in the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, a number of heat dissipation ribs 2 are evenly distributed on the inner ring of the stator sleeve 1 in the circumferential direction, the number of which can be based on actual heat dissipation requirements. Increase or decrease, by increasing the heat dissipation area to further improve the heat dissipation effect of the outer rotor electric drum.

In the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, threading holes are arranged inside the main shaft 9, the stator coil core assembly 12 is fixed on the outer ring of the stator sleeve 1, and the coils can be introduced into the main shaft 9 through the threading tube 11. Threading hole on one side.

In the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, as shown in FIG. 3, the cross section of the axial rib 4 is a streamlined polygon, and the stator sleeve 1 is welded to the bearing seats 3 at both ends, At the same time, the inner ring of the stator sleeve 1 and the 6 axial ribs 4 are respectively welded at the contact surface b between the axial ribs and the stator sleeve, and the 6 axial ribs 4 and the shaft sleeve 7 are respectively connected to the axial ribs The contact surface c of the shaft sleeve is welded, and the stator sleeve 1 is supported by the bearing seat 3 and six axial ribs 4.

In the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, as shown in FIG. 4, the first air guide plate 5 is fan-shaped, and preferably 6 first air guide plates 5 form a small front circle and a large circle The circular truncated cone is arranged at the air inlet and the air outlet respectively. The front end of the first air guide plate 5 is welded to the shaft sleeve 7 and respectively welded to two adjacent axial ribs 4.

In the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, the front end of the first air guide plate 5 can also be directly welded to the main shaft 9.

In the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, as shown in Figs. 1-2, the left side view of the second air deflector 6 is in the shape of an arc, as shown in Fig. 9, the second air deflector The top view of 6 is a rectangular shape. Preferably, 6 second air guide plates 6 form a cylindrical cylindrical shape. The two side ends are respectively welded to two adjacent axial ribs 4.

In the preferred embodiment of the air-cooled structure of the outer rotor electric drum of the present invention, the first air guide plate 5, the second air guide plate 6, the axial spokes and the stator sleeve 1 form a ventilation channel, preferably the main shaft 9 The left side of the fan is used as the air inlet, that is, the cooling air flow generated by the fan enters from the air duct opening 23 of the fixed seat 27, passes through the air inlet of the bearing seat 3 and the first air deflector 5, the second air deflector 6, the axial spokes and The air passage between the stator sleeves 1 forms an air flow, which flows out from the air passage opening 23 of the fixed seat 27 through the air outlet of the right bearing housing 3 of the main shaft 9, thereby cooling the stator core.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in further detail. In addition, it should be understood that although this specification is described in accordance with the embodiments, the above embodiments are exemplary and are not intended to To limit the scope of protection of the present invention, any changes, modifications, substitutions and modifications made by those skilled in the art to the above-mentioned embodiments without departing from the principle and purpose of the present invention shall be included in the scope of protection of the present invention. Inside.

Claims

An air-cooled structure for an outer rotor electric drum, which is characterized by comprising: a fixing base (27), a stator assembly and an end cover assembly, the fixing base (27) is connected to the stator assembly, and the stator assembly Is connected with the end cover assembly, the stator assembly includes a stator sleeve (1), an axial rib (4), a wind deflector structure, a main shaft (9), a bearing seat (3), and the stator sleeve The cylinder (1) is connected to the axial ribs (4), the axial ribs (4) are connected to the wind deflector structure, the wind deflector structure is connected to the main shaft (9), and the main shaft (9) Connected to the bearing seat (3), the bearing seat (3) is distributed at both ends of the stator sleeve (1), and the wind deflector structure is located on the stator sleeve (1) and the main shaft (9), the wind deflector structure is respectively connected with two adjacent axial ribs (4), and the wind deflector structure and the stator sleeve (1) are formed outside the main shaft (9) Ventilation channel, the inside of the fixed seat (27) is communicated with the ventilation channel;

The stator assembly includes a bearing seat (3), the outer ring of the bearing seat (3) is in a stepped shape, and the inner ring is chamfered;

The end cover assembly includes an end cover (15), an oil cover assembly, a bearing (17), and a sealing device. The two ends of the stator sleeve (1) are welded to the outer ring of the bearing seat (3), and the bearing seat (3) ) The inner ring is welded to the axial rib (4), and a plurality of air inlets and outlets are formed between the inner ring of the bearing seat (3), the axial rib (4) and the shaft sleeve (7).
The air-cooled structure of the outer rotor electric drum according to claim 1, wherein the inner ring of the stator sleeve (1) is provided with heat dissipation ribs (2), and the heat dissipation ribs (2) are arranged along the The inner ring of the stator sleeve (1) is evenly distributed in the circumferential direction.
The air-cooled structure of the outer rotor electric drum according to claim 1, wherein the fixed seat (27) includes an intermediate sleeve (26), an axial support rib (22), and a fixed outer ring (24) , The intermediate shaft sleeve (26) is fixedly connected to the main shaft (9), and the axial support ribs (22) are respectively fixedly connected to the fixed outer ring (24) and the intermediate shaft sleeve (26), and are arranged along the middle The shaft sleeve (26) is evenly distributed in the circumferential direction, and an air inlet and outlet port (23) is formed between the axial support rib (22), the intermediate shaft sleeve (26) and the fixed outer ring (24).
The air-cooled structure of the outer rotor electric drum according to claim 1, wherein the chamfer angle of the inner ring is 5°-45°.
The air-cooled structure of the outer rotor electric drum according to claim 1, wherein the axial ribs (4) and the main shaft (9) are fixedly connected by a sleeve (7), and the axial ribs The plate (4) is welded to the shaft sleeve (7) and is evenly distributed along the circumference of the outer ring of the shaft sleeve (7). The shaft sleeve (7) is fixed to the shaft by interference fit or keyway connection. Said on the spindle (9).
The air-cooled structure of the outer rotor electric drum according to claim 1, wherein the axial rib (4) is directly welded to the main shaft (9).
The air-cooled structure of the outer rotor electric drum according to claim 1, characterized in that the wind deflector structure comprises a plurality of first wind deflectors (5), and the first wind deflectors (5) are respectively located at At the front and rear ends of the main shaft (9), the first wind deflector (5) is fan-shaped, and a plurality of first wind deflectors (5) are arranged on the main shaft (9) in a ring shape. The front end of the plate (5) is connected to the main shaft (9) and is respectively welded to two adjacent axial ribs (4). The first air deflector (5) is along the outer ring of the main shaft (9). The circumference is evenly distributed, and is opposite to the air inlet and outlet.
The air-cooled structure of the outer rotor electric drum according to claim 7, wherein the wind deflector structure further comprises a second wind deflector (6), a cross section of the second wind deflector (6) In the shape of an arc, the second air deflector (6) is welded to the rear end of the first air deflector (5) at both ends of the main shaft (9), and the two sides of the second air deflector (6) The ends are respectively welded to two adjacent axial ribs (4). The second air deflector (6) is evenly distributed along the circumference of the outer ring of the main shaft (9), and is connected to the first air deflector ( 5) One by one.