An oil-immersed electric motor drum with a swelling sleeve seal

Abstract

The utility model discloses a kind of oil-immersed electric roller of expansion sleeve type sealing, including roller body, first shaft end, second shaft end, sealing mechanism, first shaft end, second shaft end is respectively rotationally connected with the end of roller body, and drive device is provided in roller body, sealing mechanism is set on the end of second shaft end;Sealing mechanism includes fixed shaft sleeve, limit screw cap, compression ring, second shaft end is provided with outlet hole, the front end of fixed shaft sleeve is fixedly connected with outlet hole, compression ring is sleeved in the rear end of fixed shaft sleeve, and elastic rubber sleeve is sleeved between fixed shaft sleeve and compression ring, limit screw cap is placed in the rear end of fixed shaft sleeve, and the port of compression ring is tightened by limit screw cap, so that compression ring compresses the elastic rubber sleeve on fixed shaft sleeve.The utility model realizes radial expansion by axial compression, effectively compensates material deformation under high temperature and high pressure, ensures that sealing performance is durable and stable, significantly reduces maintenance cost, simplifies installation process, and improves overall operation efficiency of equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of electric rollers, and in particular to an oil-immersed electric roller with an expansion sleeve seal. Background Technology

[0002] Oil-immersed electric rollers are widely used in logistics conveying systems due to their compact structure and good heat dissipation. However, the sealing of the motor lead wires has always been a technical challenge: (1) Traditional sealing methods use conventional "O" rings for sealing, which are unreliable and prone to failure. When the electric rollers are under load for a long time, the temperature rises and the internal pressure increases, which makes the "O" rings prone to aging and deformation, reducing the sealing performance, damaging the lead wire seal, causing lubricating oil leakage, and adversely affecting the normal operation and service life of the equipment. In addition, in the traditional glue-filling sealing scheme, the glue needs to go through the processes of mixing, filling, and curing. The entire process takes 24 hours to fully cure, which affects the production cycle and capacity. Moreover, as a chemical product, the glue will cause certain harm to the environment. (2) There are also cases where multi-layer sealing structures are used, such as a permanent magnet electric roller device with Chinese utility model patent publication number CN215206869U. However, this method still fails to completely solve the radial expansion problem, the sealing effect is unstable, the maintenance cost is high, and the complex structure increases the installation difficulty, which affects the production efficiency. Utility Model Content

[0003] The technical problem to be solved by this utility model embodiment is to provide an oil-immersed electric drum with an expansion sleeve seal, which achieves radial contraction through axial compression, effectively compensates for material deformation under high temperature and high pressure, ensures long-term and stable sealing performance, significantly reduces maintenance costs, simplifies the installation process, and improves the overall operating efficiency of the equipment.

[0004] To achieve the above objectives, this utility model discloses an oil-immersed electric roller with an expansion sleeve seal, comprising a roller body, a first shaft end, a second shaft end, and a sealing mechanism. The first shaft end and the second shaft end are rotatably connected to the ends of the roller body, and a driving device is provided inside the roller body. The driving device is fixedly connected to the second shaft end. A reducer is rotatably provided on the first shaft end and fixedly connected to the roller body. The reducer is driven by the driving device, which in turn drives the reducer to rotate the roller body. The sealing mechanism is located on the end of the second shaft end. The sealing mechanism includes a fixed bushing, a limiting cap, and a pressure ring. A cable outlet hole is provided on the second shaft end. The front end of the fixed bushing is fixedly connected to the cable outlet hole. The pressure ring is sleeved on the rear end of the fixed bushing, and an elastic rubber sleeve is sleeved between the fixed bushing and the pressure ring. The limiting cap is screwed onto the rear end of the fixed bushing, and the pressure ring is tightened by the limiting cap so that the pressure ring presses against the elastic rubber sleeve, so that the elastic rubber sleeve and the cable in the cable outlet hole are airtightly fitted.

[0005] Furthermore, the rear end of the pressure ring is provided with an outer conical surface, and the outer conical surface of the pressure ring is provided with several slots spaced apart along the circumference, so that the outer conical surface of the pressure ring can achieve a certain elastic deformation.

[0006] Furthermore, the limiting cap has an inner conical surface that matches the outer conical surface, so that the outer conical surface of the pressure ring gradually contracts elastically under the action of the inner conical surface of the limiting cap, thereby pressing the pressure ring tightly against the elastic sleeve on the fixed bushing, so that the elastic sleeve forms an airtight connection with the cable, effectively preventing lubricating oil leakage.

[0007] Furthermore, the outer periphery of the front end of the elastic sleeve has a limiting flange, and the inner wall of the fixed bushing has a stop ring that stops and cooperates with the limiting flange, thereby forming an airtight fit between the fixed bushing and the pressure ring by means of the limiting flange.

[0008] Furthermore, a sealing ring is provided between the front end of the fixed bushing and the outlet hole to prevent lubricating oil from seeping through the gap between the fixed bushing and the outlet hole.

[0009] Furthermore, the driving device includes a rotor and a stator winding. The rotor is disposed inside the drum body and is fixedly connected to the first shaft end and the second shaft end, respectively. The stator winding is disposed on the inner wall of the drum body.

[0010] Furthermore, the rotor includes several laminations, and the surface of the laminations is provided with several V-shaped grooves at equal intervals along the radial direction for inserting permanent magnets. The surface of the laminations is provided with weight-reducing holes between the V-shaped grooves, which reduces the overall volume and weight of the motor, making the motor lighter and more compact while maintaining high performance.

[0011] Furthermore, each of the V-shaped grooves includes a first permanent magnet groove and a second permanent magnet groove, with the included angle between the first permanent magnet groove and the second permanent magnet groove being 100°-130°. By utilizing the "magnetic concentration" characteristic of the "V"-shaped structure, the power density of the motor is improved.

[0012] Furthermore, the outer periphery of the lamination is provided with a first outer arc protrusion and a second outer arc protrusion at the ends of the first permanent magnet groove and the second permanent magnet groove, respectively, and a right-angle groove is provided between the first outer arc protrusion and the second outer arc protrusion on the outer periphery of the lamination.

[0013] Furthermore, a third outer arc protrusion is provided between the right-angle groove and the first outer arc protrusion and the second outer arc protrusion, and an inner arc groove is provided between the first outer arc protrusion, the second outer arc protrusion and the outer periphery of the punch.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) This utility model adopts an expansion sleeve sealing structure, which achieves radial contraction through axial compression, effectively compensating for material deformation under high temperature and high pressure, ensuring long-term and stable sealing performance, significantly reducing maintenance costs, simplifying the installation process, and improving the overall operating efficiency of the equipment. It not only improves the reliability of the electric roller in extreme environments, but also greatly extends the service life of the equipment and reduces the number of downtime maintenance caused by seal failure, providing a solid guarantee for the efficient and stable operation of the logistics conveying system. (2) By adjusting the included angle between the two permanent magnets, the "magnetic concentration" characteristic of the "V" shaped structure is utilized to significantly improve the power density of the motor, thereby effectively reducing the overall volume and weight of the motor, making the motor lighter and more compact while maintaining high performance. In addition, in the design of the rotor lamination, a multi-segment arc contour structure is adopted. This design avoids the traditional method of improving the distribution of the air gap magnetic field of the motor by increasing the equivalent air gap. It not only optimizes the magnetic field distribution, but also significantly weakens the torque fluctuation generated by the motor during operation, further improving the stability and operating efficiency of the motor. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the overall structure of this utility model; Figure 2 To show Figure 1 A schematic diagram of the structure of part A in the diagram; Figure 3 This is a schematic diagram of the overall structure of the sealing structure; Figure 4 This is a schematic diagram of the overall structure of the lamination; Figure 5 To show Figure 4 A schematic diagram of section B in the diagram. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will provide a more detailed description of this utility model in conjunction with the accompanying drawings.

[0017] Reference Figure 1 , Figure 2As shown, an oil-immersed electric roller with an expansion sleeve seal includes a roller body 1, a first shaft end 2, a second shaft end 3, and a sealing mechanism 4. In this embodiment, the roller body 1 is a hollow cylinder. End caps 11 are fixedly installed at both ends of the roller body 1 so that the first shaft end 2 and the second shaft end 3 are rotatably connected to the ends of the roller body 1 through bearings. The first shaft end 2 and the second shaft end 3 are fixedly connected to external equipment. A driving device is installed inside the roller body 1 and is fixedly connected to the second shaft end 3. A reducer is rotatably installed on the first shaft end 1 and fixedly connected to the roller body 1. The reducer and the driving device are connected to the roller body 1. The drive unit 5 is connected to the transmission, and the drive unit 5 drives the roller body 1 to rotate through the linkage reducer. In this embodiment, the inner cavity of the roller body 1 contains lubricating oil, which provides lubrication and cooling for the drive unit 5. The end of the second shaft end 3 is provided with a cable outlet 31 that communicates with the inner cavity of the roller body 1, so that the cable of the drive unit 5 passes through the cable outlet 31 and exits the roller body 1 to connect with the outside, thereby providing power to the drive unit. The sealing mechanism 4 is provided on the cable outlet 31 of the second shaft end 3 to prevent the lubricating fluid in the roller body 1 from leaking through the cable outlet 31.

[0018] Combination Figure 2 , Figure 3 As shown, the sealing mechanism 4 further includes a fixed bushing 41, a limiting cap 42, and a pressure ring 43. In this embodiment, the front and rear ends of the fixed bushing 41 are respectively provided with external threads, so that the front end of the fixed bushing 41 is fixedly connected to the outlet hole 31. The middle outer wall of the fixed bushing 41 is provided with a stop protrusion ring 412, and the outlet hole 31 has a sealing groove, so that a sealing ring 45 is provided between the stop protrusion ring 412 of the fixed bushing 41 and the sealing groove of the outlet hole 31, thereby preventing the lubricating oil in the outlet hole 31 from leaking out from the gap between the fixed bushing 41 and the outlet hole 31. The inner wall of the fixed bushing 41 is provided with a limiting protrusion ring 411, and the pressure ring 43 is sleeved on the rear end of the fixed bushing 41. In this embodiment, an elastic rubber sleeve 44 is fitted between the fixed bushing 41 and the pressure ring 43. The elastic rubber sleeve 44 is preferably made of nitrile rubber. The outer periphery of the front end of the elastic rubber sleeve 44 has a limiting flange 441, which makes the limiting flange 441 of the elastic rubber sleeve 44 stop and cooperate with the limiting ring 411. In this way, the limiting flange 441 of the elastic rubber sleeve 44 achieves a sealing cooperation between the fixed bushing and the pressure ring. The limiting cap 42 is screwed onto the rear end of the fixed bushing 41 through the internal thread, thereby restricting the pressure ring 43 and the elastic rubber sleeve 44 between the fixed bushing 41 and the limiting cap 42. The cable in the cable outlet 31 passes through the fixed bushing 41, the elastic rubber sleeve 44 and the limiting cap 42 in sequence.

[0019] Furthermore, the rear end of the pressure ring 43 is provided with an outer conical surface 431. The outer conical surface 431 of the pressure ring 43 is provided with several slots 432 spaced apart along the circumference. The inner side of the limiting cap 42 is provided with an inner conical surface 421 that matches the outer conical surface 431. By rotating the limiting cap 42, it moves along the length direction of the fixed bushing 41, so that the outer conical surface 431 of the pressure ring 43 gradually contracts elastically under the action of the inner conical surface 421 of the limiting cap 42, thereby tightening the port of the pressure ring 43 and pressing the pressure ring 43 against the elastic sleeve 44 on the fixed bushing 41, so that the elastic sleeve 44 and the cable form an airtight connection.

[0020] The above-mentioned design significantly enhances the pressure resistance of the sealing structure. This improvement effectively solves the problem of oil leakage caused by the gradual increase in internal pressure due to temperature rise during long-term operation of the electric drum under load, which can damage the cable outlet seal. Furthermore, the equipped elastic sleeve effectively prevents the cable from being cut, bumped, or broken by external forces during operation. Addressing the issue of fatigue aging of the elastic sleeve after long-term operation, which can lead to sealing failure, this embodiment allows for easy replacement of the elastic sleeve simply by unscrewing the limiting cap. This greatly simplifies the maintenance process, improves maintenance efficiency, and does not affect the disassembly and maintenance of internal components, ensuring the overall stability and service life of the equipment.

[0021] Reference Figure 1 , Figure 4 As shown, the drive device 5 includes a rotor and a stator winding. The second shaft end 3 is fixedly connected to the rotor. The stator winding is disposed on the rotor, and the central shaft of the rotor is connected to the reducer via gear transmission. The rotor is electrically connected to a cable, and the cable passes through the outlet hole to connect to an external power source, thereby providing power to the drive device. The drive device then drives the reducer to rotate the drum body 1. In this embodiment, the connection method between the rotor, stator winding, and reducer is an existing structure, which will not be described again here.

[0022] Traditional rotor lamination structures mostly adopt a "I" shape, where several permanent magnets under one pole are arranged laterally to form a "I" shape. The air gap magnetic field waveform of this rotor structure is close to a square wave, leading to a large number of high-order harmonics introduced into the motor's back EMF, resulting in torque fluctuations. Therefore, the outer edge of this rotor structure needs to be designed with a chamfered shape, which inevitably increases the motor's equivalent air gap, ultimately resulting in low power density, large size and weight, and high material consumption.

[0023] Reference Figure 4 , Figure 5As shown, in this embodiment, the rotor includes several laminations 51. Several V-shaped grooves 52 are arranged radially at equal intervals on the surface of the laminations 51. Each V-shaped groove includes a first permanent magnet groove 521 and a second permanent magnet groove 522. The included angle between the first permanent magnet groove 521 and the second permanent magnet groove 522 is 100°-130°, which is used to insert permanent magnets. In this embodiment, the overall shape of the first permanent magnet groove 521 and the second permanent magnet groove 522 is trapezoidal, but not limited to trapezoidal shape. It can also be rectangular or parallelogram, so that the two permanent magnet grooves under the same pole are separated from each other, while needing to be as close as possible, thereby increasing the overall structural strength of the rotor laminations and reducing the pole leakage flux.

[0024] In addition, weight-reducing holes 58 are provided on the surface of the stamping 51 between the V-grooves 52. In this embodiment, eight weight-reducing holes are preferably used and are evenly distributed along the circumference.

[0025] Even better, the traditional permanent magnet synchronous motor with an embedded linear rotor lamination has a circular outer contour. This structure has a poor magnetic field spatial distribution, and the radial component distribution curve of the air gap magnetic flux density is similar to a rectangular wave. When the rotor rotates, the back electromotive force generated on the stator winding will inevitably introduce abundant harmonics. This will inevitably cause the motor to generate a lot of noise, large current, low efficiency, and severe heat generation during operation. In contrast, the lamination 51 has a first outer arc protrusion 53 at the ends of the first permanent magnet slot 521 and the second permanent magnet slot 522, respectively. The second outer arc protrusion 54 and the first outer arc protrusion 53, the second outer arc protrusion 54 and the outer periphery of the lamination 51 are provided with an inner arc groove 57, so as to reduce the air gap magnetic resistance of the rotor lamination and enhance the air gap magnetic flux density of the rotor lamination. The outer periphery of the lamination 51 is provided with a right angle groove 55 between the first outer arc protrusion 53 and the second outer arc protrusion 54, thereby narrowing the inter-pole magnetic circuit and weakening the inter-pole leakage magnetic flux. The right angle groove 55 and the first outer arc protrusion 53 and the second outer arc protrusion 54 are respectively provided with a third outer arc protrusion 56, which serves as a transition.

[0026] Based on the above design, the "V"-shaped structure's "magnetic focusing" characteristics increase the motor's power density, reduce its size, and lighten its weight. Furthermore, the lamination profile employs a multi-segment arc design, optimizing the air gap magnetic field distribution by increasing the equivalent air gap, thereby reducing torque fluctuations. Compared to traditional straight-rotor lamination motors, V-shaped rotor lamination motors offer higher power density, smaller size, higher efficiency, and smoother operation.

[0027] Of course, the above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They cannot be used to limit the protection scope of this utility model. All modifications made in accordance with the spirit of the main technical solution of this utility model should be covered within the protection scope of this utility model.

Claims

1. An oil-immersed electric roller with an expansion sleeve seal, characterized in that, The device includes a roller body (1), a first shaft end (2), a second shaft end (3), and a sealing mechanism (4). The first shaft end (2) and the second shaft end (3) are rotatably connected to the ends of the roller body (1), and a driving device (5) is provided inside the roller body (1). The driving device is fixedly connected to the second shaft end (3). A reducer is rotatably provided on the first shaft end (2) and fixedly connected to the roller body (1). The reducer is connected to the driving device (5) for transmission. The roller body (1) is rotated by the driving device (5) in conjunction with the reducer. The sealing mechanism (4) is provided on the end of the second shaft end (3). The sealing mechanism (4) includes a fixed bushing (41), a limiting cap (42), and a pressure ring (43). The second shaft end (3) is provided with a wire outlet hole (31). The front end of the fixed bushing (41) is fixedly connected to the wire outlet hole (31). The pressure ring (43) is sleeved inside the rear end of the fixed bushing (41). An elastic rubber sleeve (44) is sleeved inside the pressure ring (43). The limiting cap (42) is screwed onto the rear end of the fixed bushing (41) and the port of the pressure ring (43) is tightened by the limiting cap (42) so that the pressure ring (43) presses the elastic rubber sleeve (44) so ​​that the elastic rubber sleeve (44) is airtightly fitted with the cable in the wire outlet hole (31).

2. The oil-immersed electric drum with an expansion sleeve seal according to claim 1, characterized in that, The rear end of the pressure ring (43) is provided with an outer conical surface (431), and the outer conical surface (431) of the pressure ring (43) is provided with a plurality of slots (432) at intervals along the circumference.

3. The oil-immersed electric drum with an expansion sleeve seal according to claim 2, characterized in that, The limiting cap (42) has an inner conical surface (421) that matches the outer conical surface (431) so that the outer conical surface (431) of the pressure ring (43) gradually contracts elastically under the action of the inner conical surface (421) of the limiting cap (42).

4. The oil-immersed electric drum with an expansion sleeve seal according to claim 1, characterized in that, The outer periphery of the front end of the elastic sleeve (44) has a limiting flange (441), and the inner wall of the fixed bushing (41) has a limiting ring (411) that is in stop-fit ​​with the limiting flange (441).

5. The oil-immersed electric drum with an expansion sleeve seal according to claim 1, characterized in that, A sealing ring (45) is provided between the front end of the fixed bushing (41) and the outlet hole (31).

6. The oil-immersed electric drum with an expansion sleeve seal according to claim 1, characterized in that, The drive device (5) includes a rotor and a stator winding. The rotor is fixedly connected to the second shaft end (3). The stator winding is disposed on the rotor. The rotor is connected to the reducer through gear transmission.

7. The oil-immersed electric drum with an expansion sleeve seal according to claim 6, characterized in that, The rotor includes several laminations (51), and several V-shaped grooves (52) are arranged radially at equal intervals on the surface of the laminations (51) for inserting permanent magnets. Weight reduction holes (58) are provided on the surface of the laminations (51) between the V-shaped grooves (52).

8. The oil-immersed electric drum with an expansion sleeve seal according to claim 7, characterized in that, The V-shaped grooves each include a first permanent magnet groove (521) and a second permanent magnet groove (522), and the included angle between the first permanent magnet groove (521) and the second permanent magnet groove (522) is 100°-130°.

9. The oil-immersed electric drum with an expansion sleeve seal according to claim 8, characterized in that, The outer periphery of the lamination (51) is provided with a first outer arc protrusion (53) and a second outer arc protrusion (54) at the ends of the first permanent magnet groove (521) and the second permanent magnet groove (522), respectively. A right-angle groove (55) is provided between the first outer arc protrusion (53) and the second outer arc protrusion (54) on the outer periphery of the lamination (51).

10. The oil-immersed electric drum with an expansion sleeve seal according to claim 9, characterized in that, A third outer arc protrusion (56) is provided between the right-angle groove (55) and the first outer arc protrusion (53) and the second outer arc protrusion (54), and an inner arc groove (57) is provided between the first outer arc protrusion (53), the second outer arc protrusion (54) and the outer periphery of the punch (51).

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