Three-phase asynchronous motor for direct-drive centrifugal dehydrator

Abstract

The present invention relates to the technical field of motors for dehydrators, and in particular to a three-phase asynchronous motor for a direct-drive centrifugal dehydrator, comprising a motor housing, a main shaft assembled in the motor housing through bearings, a rotor fixedly sleeved on the main shaft, a stator sleeved on the rotor, and the stator fixedly connected to the inner wall of the motor housing, the lower end face of the motor housing is detachably locked with a motor lower end cover, the upper end face is detachably locked with a motor upper end cover, and the upper end face of the motor upper end cover is detachably locked with a bearing end cover; three bearings are axially arranged in the upper end cover of the motor, two of which are axially abutted and distributed at the upper end of the upper end cover of the motor, and the other bearing is distributed at the lower end of the upper end cover of the motor; two bearings are axially arranged in the lower end cover of the motor, and the present invention can greatly improve the stability of the main shaft during assembly through the five bearings arranged above and with different distribution positions, thereby reducing the degree of axial movement and radial runout, thereby improving the vibration resistance of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors for dehydrators, in particular to a three-phase asynchronous motor for a direct-drive centrifugal dehydrator. Background Art

[0002] A centrifugal dehydrator is a mechanical device specifically designed for separating solid-solution or liquid-solid materials. It can perform various operations at full speed, such as feeding, centrifugal sedimentation separation, drying, and continuous automatic unloading. It is widely used in industries such as petrochemicals, refining, coalification, and environmental protection, and is essential for research and production related to new materials and new energy sources. When a three-phase asynchronous motor is used as a power source in a centrifugal dehydrator, it is found that when the motor's main shaft is assembled with the motor housing, upper end cover, and lower end cover, the axial play and radial runout of the motor's main shaft during operation are affected by the bearing installation position and number, thereby affecting the motor's vibration resistance. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the present invention discloses a three-phase asynchronous motor for a direct-drive centrifugal dehydrator. Through the five bearings arranged as mentioned above and distributed at different positions, the stability of the main shaft during assembly can be greatly improved, thereby reducing the degree of axial movement and radial runout, thereby improving the vibration resistance of the motor.

[0004] The present invention is achieved through the following technical solutions:

[0005] A three-phase asynchronous motor for a direct-drive centrifugal dehydrator comprises a motor housing, a main shaft is assembled in the motor housing through a bearing, a rotor is fixedly sleeved on the main shaft, a stator is sleeved on the rotor, and the stator is fixedly connected to the inner wall of the motor housing, a motor lower end cover is detachably locked on the lower end face of the motor housing, a motor upper end cover is detachably locked on the upper end face of the motor housing, and a bearing end cover is detachably locked on the upper end face of the motor upper end cover;

[0006] Three bearings are axially arranged in the upper end cover of the motor, two of which are axially abutted and distributed at the upper end of the upper end cover of the motor, and the other bearing is distributed at the lower end of the upper end cover of the motor; two bearings are axially arranged in the lower end cover of the motor, and the two bearings are axially abutted;

[0007] The outer surfaces of the motor housing, the motor upper end cover, the bearing end cover and the motor lower end cover are sequentially provided with a corrosion-resistant layer, a transition bonding layer and an impact-resistant layer from the inside to the outside.

[0008] Preferably, the main shaft includes a first shaft segment, a second shaft segment, a third shaft segment, a fourth shaft segment, a fifth shaft segment, a sixth shaft segment and a seventh shaft segment that are integrally formed and connected from top to bottom; the diameters of the first shaft segment and the fifth shaft segment are the same, the diameters of the second shaft segment and the fourth shaft segment are the same, the diameter of the third shaft segment is larger than the diameter of the fourth shaft segment, and the diameters of the fifth shaft segment, the sixth shaft segment and the seventh shaft segment decrease in sequence and are all smaller than the diameter of the fourth shaft segment.

[0009] Preferably, a first annular groove is provided at the left end of the inner wall of the upper end cover of the motor, and a second annular groove is provided at the right end; a third annular groove and a fourth annular groove are provided in sequence at the upper end of the lower end cover of the motor.

[0010] Preferably, the diameter of the first annular groove is smaller than the diameter of the second annular groove, the diameter of the third annular groove is smaller than the diameter of the first annular groove, and the diameter of the third annular groove is larger than the diameter of the fourth annular groove.

[0011] Preferably, two abutting bearings are axially distributed in the first annular groove, the outer ring of the bearing abuts the inner wall of the first annular groove, and the inner ring abuts the outer diameter of the first shaft segment, and the upper bearing is pressed and abutted by the bearing end cover, and the lower end face of the outer ring and the lower end face of the inner ring of the lower bearing are pressed and abutted respectively through the first annular groove and the second shaft segment.

[0012] Preferably, a bearing is axially arranged in the second annular groove, and the upper end surface of the outer ring and the lower end surface of the inner ring of the bearing are pressed and abutted against each other through the second annular groove and the third shaft segment respectively.

[0013] Preferably, a bearing is axially arranged in the third annular groove, and the upper end surface of the inner ring and the lower end surface of the outer ring of the bearing are pressed and abutted against each other through the fifth shaft segment and the third annular groove respectively.

[0014] Preferably, a bearing is provided in the fourth annular groove, and the upper end surface of the inner ring and the lower end surface of the outer ring of the bearing are pressed and abutted against each other through the sixth shaft segment and the fourth annular groove respectively.

[0015] Preferably, the corrosion-resistant layer adopts a Zn-Ni-Al-Mg alloy coating with a thickness of 0.5-0.8 mm, the transition bonding layer adopts a Ti-Al-Nb alloy coating with a thickness of 0.15-0.2 mm, and the impact-resistant layer adopts a Ni-PB alloy coating with a thickness of 0.3-0.5 mm.

[0016] The present invention has the following beneficial effects:

[0017] The five bearings arranged in different locations significantly enhance the stability of the spindle assembly, reducing axial and radial runout, and thus improving the motor's vibration resistance. The corrosion-resistant layer extends the corrosion-resistant service life of the motor housing. The transition layer improves the bonding strength between the impact-resistant layer and the corrosion-resistant layer, extending the hardness and wear resistance of the motor housing and enhancing its impact resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a half-sectional view of the structure of an embodiment of the present invention.

[0020] In the figure: 1-motor housing, 2-bearing, 3-main shaft, 31-first shaft segment, 32-second shaft segment, 33-third shaft segment, 34-fourth shaft segment, 35-fifth shaft segment, 36-sixth shaft segment, 37-seventh shaft segment, 4-rotor, 5-stator, 6-motor lower end cover, 61-third annular groove, 62-fourth annular groove, 7-motor upper end cover, 71-first annular groove, 72-second annular groove, 8-bearing end cover. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] See also Figure 1 The present invention provides a three-phase asynchronous motor for a direct-drive centrifugal dehydrator, comprising a motor housing 1, a main shaft 3 being assembled in the motor housing 1 via a bearing 2, a rotor 4 being fixedly sleeved on the main shaft 3, a stator 5 being sleeved on the rotor 4, and the stator 5 being fixedly connected to the inner wall of the motor housing 1, a motor lower end cover 6 being detachably locked to the lower end face of the motor housing 1, a motor upper end cover 7 being detachably locked to the upper end face of the motor upper end cover 7, and a bearing end cover 8 being detachably locked to the upper end face of the motor upper end cover 7;

[0023] Three bearings 2 are axially arranged in the upper end cover 7 of the motor, two of which are axially abutted and distributed at the upper end of the upper end cover 7 of the motor, and the other bearing 2 is distributed at the lower end of the upper end cover 7 of the motor; two bearings 2 are axially arranged in the lower end cover 6 of the motor, and the two bearings 2 are axially abutted; through the above-mentioned five bearings 2 arranged at different distribution positions, the stability of the main shaft 3 during assembly can be greatly improved, thereby reducing the degree of axial movement and radial runout, thereby improving the vibration resistance of the motor.

[0024] The outer surfaces of the motor housing 1, motor upper end cover 7, bearing end cover 8, and motor lower end cover 6 are sequentially provided with a corrosion-resistant layer, a transition bonding layer, and an impact-resistant layer, from the inside out. The corrosion-resistant layer extends the corrosion-resistant service life of the motor housing. The transition bonding layer improves the bonding strength between the impact-resistant layer and the corrosion-resistant layer, and the impact-resistant layer increases the hardness and wear resistance of the motor housing, thereby improving its impact resistance.

[0025] The main shaft 3 includes a first shaft segment 31, a second shaft segment 32, a third shaft segment 33, a fourth shaft segment 34, a fifth shaft segment 35, a sixth shaft segment 36, and a seventh shaft segment 37, which are integrally formed and connected from top to bottom. The first shaft segment 31 and the fifth shaft segment 35 have the same diameter, the second shaft segment 32 and the fourth shaft segment 34 have the same diameter, the third shaft segment 33 has a larger diameter than the fourth shaft segment 34, and the diameters of the fifth shaft segment 35, the sixth shaft segment 36, and the seventh shaft segment 37 decrease in order and are all smaller than the diameter of the fourth shaft segment 34. The inner wall of the upper end cover 7 of the motor has a first annular groove 71 at the left end and a second annular groove 72 at the right end. The upper end of the lower end cover 6 of the motor has a third annular groove 61 and a fourth annular groove 62, respectively. The diameter of the first annular groove 71 is smaller than that of the second annular groove 72, the diameter of the third annular groove 61 is smaller than that of the first annular groove 71, and the diameter of the third annular groove 61 is larger than that of the fourth annular groove 62. Two bearings 2 are axially distributed within the first annular groove 71, abutting each other. The outer rings of the bearings 2 abut against the inner wall of the first annular groove 71, while the inner rings abut against the outer diameter of the first shaft segment 31. The upper bearing 2 is pressed against each other via the bearing end cap 8. The lower end faces of the outer ring and inner ring of the lower bearing 2 are pressed against each other via the first annular groove 71 and the second shaft segment 32. A bearing 2 is axially located within the second annular groove 72, with the upper end face of the outer ring and the lower end face of the inner ring of the bearing 2 pressed against each other via the second annular groove 72 and the third shaft segment 33.

[0026] A bearing 2 is axially positioned within the third annular groove 61. The upper end face of the inner ring and the lower end face of the outer ring of the bearing 2 are pressed against the third annular groove 61 via the fifth shaft segment 35. A bearing 2 is positioned within the fourth annular groove 62. The upper end face of the inner ring and the lower end face of the outer ring of the bearing 2 are pressed against the fourth annular groove 62 via the sixth shaft segment 36. The segmented design for the different diameters of the main shaft 3 and the provision of multiple annular grooves achieve thrust support for bearings 2 installed at different locations, preventing axial movement and radial runout of each bearing 2.

[0027] The corrosion-resistant layer adopts a Zn-Ni-Al-Mg alloy coating with a thickness of 0.5-0.8mm, the transition bonding layer adopts a Ti-Al-Nb alloy coating with a thickness of 0.15-0.2mm, and the impact-resistant layer adopts a Ni-PB alloy coating with a thickness of 0.3-0.5mm, which improves the hardness and wear resistance of the motor casing. The hardness after heat treatment can reach 1450-1500Hv.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A three-phase asynchronous motor for a direct-drive centrifugal dehydrator, comprising a motor housing (1), characterized in that: A main shaft (3) is assembled in the motor housing (1) via a bearing (2); a rotor (4) is fixedly sleeved on the main shaft (3); a stator (5) is sleeved on the rotor (4); the stator (5) is fixedly connected to the inner wall of the motor housing (1); a motor lower end cover (6) is detachably locked to the lower end face of the motor housing (1); a motor upper end cover (7) is detachably locked to the upper end face of the motor housing (1); and a bearing end cover (8) is detachably locked to the upper end face of the motor upper end cover (7); Three bearings (2) are axially arranged in the upper end cover (7) of the motor, two of which are axially abutted and distributed at the upper end of the upper end cover (7) of the motor, and another bearing (2) is distributed at the lower end of the upper end cover (7) of the motor; two bearings (2) are axially arranged in the lower end cover (6) of the motor, and the two bearings (2) are axially abutted; The outer surfaces of the motor housing (1), the motor upper end cover (7), the bearing end cover (8) and the motor lower end cover (6) are provided with a corrosion-resistant layer, a transition bonding layer and an impact-resistant layer in sequence from the inside to the outside; The main shaft (3) comprises a first shaft segment (31), a second shaft segment (32), a third shaft segment (33), a fourth shaft segment (34), a fifth shaft segment (35), a sixth shaft segment (36) and a seventh shaft segment (37) which are integrally formed and connected from top to bottom; the first shaft segment (31) and the fifth shaft segment (35) have the same diameter, the second shaft segment (32) and the fourth shaft segment (34) have the same diameter, the diameter of the third shaft segment (33) is larger than the diameter of the fourth shaft segment (34), and the diameters of the fifth shaft segment (35), the sixth shaft segment (36) and the seventh shaft segment (37) decrease in sequence and are all smaller than the diameter of the fourth shaft segment (34); The inner wall of the motor upper end cover (7) is provided with a first annular groove (71) at the left end and a second annular groove (72) at the right end; the upper end of the motor lower end cover (6) is provided with a third annular groove (61) and a fourth annular groove (62) in sequence; The diameter of the first annular groove (71) is smaller than the diameter of the second annular groove (72), the diameter of the third annular groove (61) is smaller than the diameter of the first annular groove (71), and the diameter of the third annular groove (61) is larger than the diameter of the fourth annular groove (62); The corrosion-resistant layer adopts a Zn-Ni-Al-Mg alloy coating with a thickness of 0.5-0.8 mm, the transition bonding layer adopts a Ti-Al-Nb alloy coating with a thickness of 0.15-0.2 mm, and the impact-resistant layer adopts a Ni-PB alloy coating with a thickness of 0.3-0.5 mm. The hardness after heat treatment reaches 1450-1500 Hv.

2. The three-phase asynchronous motor for a direct-drive centrifugal dehydrator according to claim 1, characterized in that: Two bearings (2) are axially distributed in the first annular groove (71) and are in contact with each other. The outer ring of the bearing (2) is in contact with the inner wall of the first annular groove (71), and the inner ring is in contact with the outer diameter of the first shaft section (31). The upper bearing (2) is pressed and abutted against each other through the bearing end cover (8), and the lower end face of the outer ring and the lower end face of the inner ring of the lower bearing (2) are pressed and abutted against each other through the first annular groove (71) and the second shaft section (32).

3. The three-phase asynchronous motor for a direct-drive centrifugal dehydrator according to claim 1, characterized in that: The bearing (2) is axially arranged in the second annular groove (72), and the upper end face of the outer ring and the lower end face of the inner ring of the bearing (2) are pressed and abutted against each other through the second annular groove (72) and the third shaft section (33).

4. The three-phase asynchronous motor for a direct-drive centrifugal dehydrator according to claim 1, characterized in that: The bearing (2) is axially arranged in the third annular groove (61), and the upper end face of the inner ring and the lower end face of the outer ring of the bearing (2) are pressed and abutted against each other through the fifth shaft segment (35) and the third annular groove (61).

5. The three-phase asynchronous motor for a direct-drive centrifugal dehydrator according to claim 1, characterized in that: The bearing (2) is arranged in the fourth annular groove (62), and the upper end surface of the inner ring and the lower end surface of the outer ring of the bearing (2) are pressed and abutted against each other through the sixth shaft segment (36) and the fourth annular groove (62).

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