A high voltage permanent magnet synchronous variable frequency motor for mining

Abstract

The present application relates to the technical field of permanent magnet synchronous variable frequency motors, and discloses a high-voltage mining permanent magnet synchronous variable frequency motor, including a housing, both ends of the housing are fixedly installed with housing covers, the middle part of the housing inner cavity is fixedly installed with a stator and a rotor, and both ends of the rotor shaft are respectively provided with a linkage sleeve I and a linkage sleeve II, the two linkage sleeves have the same structure, and a bearing is arranged between the two linkage sleeves, the linkage sleeve I includes a ring plate part and a shaft sleeve part, and the inner ring of the bearing is arranged between the two shaft sleeve parts. One side of the two ring plate parts is movably fitted with an oil seal ring, and the oil seal rings are respectively located on both sides of the bearing, and the side of the oil seal ring away from the ring plate part is provided with a synchronously moving piston slip ring and a piston slider, when the lubricating oil is pumped to lubricate the bearing, the lubricating oil will flow to one side of the piston slip ring and the piston slider respectively, and the piston slip ring and the piston slider are synchronously moved toward the ring plate part to form a seal by utilizing the pressure difference between the piston slip ring and the piston slider.

Description

Technical Field

[0001] The present application relates to the technical field of permanent magnet synchronous variable frequency motors, and in particular to a high voltage permanent magnet synchronous variable frequency motor for mining. Background Art

[0002] High-voltage mining permanent magnet synchronous variable frequency motor is a motor designed for harsh environments such as mines. It has the advantages of high efficiency and energy saving, good speed regulation performance, large starting torque and large load capacity. In the ventilation, drainage, transportation and other systems of mines, this high-voltage mining permanent magnet synchronous variable frequency motor can play an important role. The use of high-voltage mining permanent magnet synchronous variable frequency motor improves work efficiency.

[0003] However, when the existing high-voltage permanent magnet synchronous variable frequency motor is used in mines, due to the high load conditions, the bearing capacity of the motor rotor shaft is large, and generally a circulating lubrication system is required for lubrication. The circulation system of the lubricating oil has high requirements on sealing. The existing high-voltage permanent magnet synchronous variable frequency motor for mining has a sealing ring that is directly in contact with the shaft, which makes the sealing ring and the shaft easy to wear and consume, resulting in the problem of easy leakage of the lubricating oil in the circulation system. In addition, the sealing ring is consumed quickly and needs to be replaced frequently, which affects the working efficiency of the high-voltage permanent magnet synchronous variable frequency motor for mining. Summary of the invention

[0004] The present application proposes a high-voltage permanent magnet synchronous variable frequency motor for mining, which has the advantages of good bearing sealing effect of the rotor shaft and compensating for the wear and consumption of the sealing ring, so as to solve the problem that the sealing ring of the existing high-voltage permanent magnet synchronous variable frequency motor for mining is easily worn and consumed and causes leakage when a circulating lubrication system is set under high load.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: a high-voltage permanent magnet synchronous variable frequency motor for mining, comprising a shell, shell covers are fixedly installed at both ends of the shell, a stator is fixedly installed in the middle of the inner cavity of the shell, a rotor is provided on the inner side of the stator, a rotating shaft is installed on the rotor, a linkage sleeve I and a linkage sleeve II are respectively provided at both ends of the rotating shaft, the linkage sleeve I and the linkage sleeve II have the same structure, and a bearing installed on the rotating shaft is provided between the linkage sleeve I and the linkage sleeve II.

[0006] The linkage sleeve I comprises two parts, a ring plate part and a shaft sleeve part, and the inner ring of the bearing is arranged between the two shaft sleeve parts.

[0007] One side of the two ring plate parts is movably fitted with an oil seal ring, and the oil seal rings are respectively located on both sides of the bearing. The side of the oil seal ring away from the ring plate part is provided with a piston slip ring and a piston slider that move synchronously. When the lubricating oil is pumped to lubricate the bearing, the lubricating oil will flow to the opposite sides of the piston slip ring and the piston slider respectively, and the pressure difference between the piston slip ring and the piston slider will be utilized to make the piston slip ring and the piston slider move synchronously toward the ring plate part.

[0008] Furthermore, dustproof sealing rings are provided on both shell covers, and the inner sides of the dustproof sealing rings are movably fitted with the outer sides of the shell body. The dustproof sealing rings are provided to prevent external dust from entering through the gap between the shell cover and the shell body.

[0009] Furthermore, the outer diameter of the ring plate portion is larger than the outer diameter of the shaft sleeve portion, which facilitates the use of the side surface of the ring plate portion and the side surface of the oil seal ring for sealing, and the ring plate portion and the shaft sleeve portion are integrally formed, so that the overall strength of the linkage sleeve I remains high.

[0010] Furthermore, a nut is threadedly installed at one end of the rotating shaft, and the nut is located on the side of the linkage sleeve II away from the linkage sleeve I. The nut limits the linkage sleeve I, the inner ring of the bearing and the linkage sleeve II to prevent the linkage sleeve I, the inner cavity of the bearing and the linkage sleeve II from moving horizontally along the rotating shaft during the operation of the motor, while not affecting the subsequent disassembly of the motor.

[0011] Furthermore, two limiting ring plates I are movably installed inside the shell, one side of the two limiting ring plates I is respectively fitted with the inner sides of the two shell covers, and the inner side of the limiting ring plate I is close to the outer side of the ring plate part on the linkage sleeve II without contacting, and the shell is movably installed with limiting ring plates II located on both sides of the stator, the inner side of the limiting ring plate II is close to the outer side of the ring plate part on the linkage sleeve I without contacting, a wire groove is provided on the limiting ring plate II, and a wire hole connected to the wire groove is provided on the shell, so that the wire wound on the stator can extend out of the outside of the shell through the wire groove and the wire hole.

[0012] Furthermore, the shell is provided with a plurality of equidistantly arranged heat dissipation water grooves, the number of the heat dissipation water grooves is not less than two, and the two outermost heat dissipation water grooves are respectively located on both sides of the stator, and the bottom of the shell is provided with heat dissipation holes connected to the heat dissipation water grooves, and the shell is provided with two guide grooves, and the two guide grooves are respectively located at the two outermost heat dissipation water grooves, and the two guide grooves are respectively connected to the inlet pipe and the outlet pipe of the cooling water, and the cooling water is introduced through one of the guide grooves, and the heat dissipation water grooves are connected by the heat dissipation through holes, so that the cooling water flows through the heat dissipation water grooves on the shell and is discharged through another guide groove, and the shell is effectively cooled by circulating cooling water.

[0013] Furthermore, the shell body is internally movably installed with a limiting sleeve I and a limiting sleeve II located between a limiting ring plate I and a limiting ring plate II, one side of the limiting sleeve I is fitted with a side of the limiting ring plate II away from the stator, the limiting sleeve I is movably mounted on the outside of the linkage sleeve I, one side of the limiting sleeve II is fitted with a side of the limiting ring plate I away from the shell cover, the limiting sleeve I is fitted with the opposite surface of the limiting sleeve II, the limiting sleeve II is movably mounted on the outside of the linkage sleeve II, and the limiting sleeve I has the same structure as the limiting sleeve II, the limiting sleeve I and the limiting sleeve II are symmetrically arranged with respect to each other's opposite surfaces, the outer ring of the bearing is arranged on the inner side between the limiting sleeve I and the limiting sleeve II, and a limiting sealing ring is provided on the outer side between the limiting sleeve I and the limiting sleeve II.

[0014] Furthermore, an annular cavity is provided on one side of the limiting sleeve I, a circular groove is provided on the other side of the limiting sleeve I, and a plurality of cylindrical cavities connecting the annular cavity and the circular groove are provided on the limiting sleeve I, the number of the cylindrical cavities is not less than two, and a plurality of cylindrical cavities are distributed in a circular array on the limiting sleeve I.

[0015] Furthermore, a piston sliding ring is movably mounted inside the annular cavity, an oil sealing ring is fixedly connected to one side of the piston sliding ring, a side of the oil sealing ring away from the piston sliding ring is movably fitted with a side of the ring plate portion, a linkage shaft corresponding to the cylindrical cavity is fixedly connected to the side of the piston sliding ring away from the oil sealing ring, an end of the linkage shaft away from the piston sliding ring extends to the interior of the cylindrical cavity and a piston slider is fixedly mounted thereon, the piston slider is movably sealed with the cylindrical cavity, a positioning sealing ring is movably mounted on the linkage shaft between the piston sliding ring and the piston slider, and the positioning sealing ring is fixedly mounted in the annular cavity.

[0016] Furthermore, an oil inlet hole connected to the annular cavity is provided at the top of the limiting sleeve I, a pipe joint I is threadedly installed on the top of the shell, the bottom end of the pipe joint I is threadedly sleeved with the oil inlet hole, and the pipe joint I is used to connect the pipeline for the entry of lubricating oil, an oil outlet hole connected to the annular cavity is provided at the bottom of the limiting sleeve II, a pipe joint II is threadedly installed on the bottom of the shell, the top end of the pipe joint II is threadedly sleeved with the oil outlet hole, and the pipe joint II is used to connect the pipeline for the discharge of lubricating oil, two groups of oil guide holes are provided on the limiting sleeve I, and the number of the two groups of oil guide holes is the same as the number of cylindrical cavities, one group of oil guide holes connects the annular cavity and the inner side of the limiting sleeve I, and the other group of oil guide holes connects the cylindrical cavity and the inner side of the limiting sleeve I, the limiting sleeve II is provided with the same oil guide holes as the limiting sleeve I, a gap for the lubricating oil to flow is reserved between the inner side of the limiting sleeve I and the outer side of the ring plate portion on the linkage sleeve I, and a gap for the lubricating oil to flow is reserved between the inner side of the limiting sleeve II and the outer side of the ring plate portion on the linkage sleeve II.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present application provides a high-voltage permanent magnet synchronous variable frequency motor for mining, which is sealed by the oil sealing rings on both sides of the bearing respectively fitting with one side of the ring plate part of the linkage sleeve I and the linkage sleeve II, replacing the existing oil sealing ring directly fitting and sealing with the rotating shaft. During the sealing period, the wear and tear can be compensated by the horizontal movement of the oil sealing ring, so that the two sides of the bearing can maintain an effective sealing state for a long time, preventing the problem of easy leakage of the lubricating oil circulating lubrication of the bearing.

[0019] 2. A piston slip ring and a piston slider that move synchronously are provided on the side of the oil seal ring away from the ring plate portion. When the lubricating oil is pumped to lubricate the bearing, the lubricating oil will flow to the opposite sides of the piston slip ring and the piston slider respectively. The pressure difference between the piston slip ring and the piston slider is used to make the piston slip ring and the piston slider move synchronously toward the ring plate portion. If the pressure of the lubricating oil pumping is controlled to remain unchanged, the difference in oil pressure between the piston slip ring and the piston slider is also fixed, and the pressure difference makes the piston slip ring and the piston slider move synchronously toward the ring plate portion, so as to use the oil pressure difference to provide the contact pressure between the oil seal ring and the ring plate portion to achieve sealing. Even if the contact part between the oil seal ring and the ring plate portion is worn and consumed, the oil seal ring and the ring plate portion can still maintain a stable sealing state. Compared with the conventional method of using a spring to compensate for the wear and consumption of the oil seal ring, the problem of lubricating oil leakage caused by the reduction of the sealing pressure provided by the spring to the oil seal ring after the oil seal ring is worn and consumed is avoided. There is no need to frequently replace the seal ring, which improves the efficiency of long-term high-load operation of the high-voltage mining permanent magnet synchronous variable frequency motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without creative work:

[0021] Figure 1 This is a schematic diagram of the internal structure of a high-voltage mining permanent magnet synchronous variable frequency motor;

[0022] Figure 2 for Figure 1 Schematic diagram of the sealing structure of the bearing at one end of the rotating shaft;

[0023] Figure 3 for Figure 2 Schematic diagram of the explosion structure of the two limiting sets;

[0024] Figure 4 for Figure 3 A schematic diagram of the structure of the middle limit set I;

[0025] Figure 5 for Figure 3 Schematic diagram of the connection structure of the Sinopec sealing ring.

[0026] In the figure: 1, shell; 101, wire hole; 102, heat dissipation water tank; 103, heat dissipation through hole; 2, shell cover; 3, stator; 4, rotor; 5, rotating shaft; 6, dustproof sealing ring; 7, linkage sleeve I; 701, ring plate part; 702, shaft sleeve part; 8, linkage sleeve II; 9, bearing; 10, limiting ring plate I; 11, limiting ring plate II; 111, wire groove; 12, limiting sleeve I; 121, oil inlet hole; 13, limiting sleeve II; 131, oil outlet hole; 14, annular cavity; 15, circular groove; 16, cylindrical cavity; 17, piston sliding ring; 18, oil sealing ring; 19, linkage shaft; 20, piston slider; 21, positioning sealing ring; 22, pipe joint I; 23, pipe joint II; 24, oil guide hole; 25, guide groove; 26, limiting sealing ring. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example

[0029] like Figure 1-Figure 2 A high-voltage permanent magnet synchronous variable frequency motor for mining includes a shell 1, shell covers 2 are fixedly installed at both ends of the shell 1, the shell cover 2 is fixedly installed on the shell 1 by bolts, a stator 3 is fixedly installed in the middle of the inner cavity of the shell 1, a rotor 4 is movably arranged on the inner side of the stator 3, a rotating shaft 5 is fixedly installed on the rotor 4, and both ends of the rotating shaft 5 extend out of the outside of the two shell covers 2, dustproof sealing rings 6 are arranged on the two shell covers 2, the inner side of the dustproof sealing rings 6 is movably fitted with the outer side of the shell 1, and the setting of the dustproof sealing rings 6 prevents external dust from entering through the gap between the shell cover 2 and the shell 1.

[0030] See also Figure 1-Figure 3The movable set on the rotating shaft 5 has two linkage sleeves Ⅰ7, and the two linkage sleeves Ⅰ7 are respectively located on both sides of the rotor 4. The linkage sleeve Ⅰ7 includes two parts, a ring plate portion 701 and a shaft sleeve portion 702. The outer diameter of the ring plate portion 701 is greater than the outer diameter of the shaft sleeve portion 702, and the ring plate portion 701 and the shaft sleeve portion 702 are integrally formed. The movable set on the rotating shaft 5 has two linkage sleeves Ⅱ8, and the two linkage sleeves Ⅱ8 are respectively located on the outer sides of the two linkage sleeves Ⅰ7. The structure of the linkage sleeve Ⅱ8 is the same as that of the linkage sleeve Ⅰ7, that is, the linkage sleeve Ⅱ8 is also composed of two parts, a ring plate portion 701 and a shaft sleeve portion 702. A bearing 9 is installed between the linkage sleeve I7 and the linkage sleeve II8. Both sides of the inner ring of the bearing 9 are movably connected to one end of the two shaft sleeve parts 702, and the outer side of the rotating shaft 5 is movably connected to the inner ring of the bearing 9. The inner ring of the bearing 9 rotates with the rotating shaft 5. A nut is threadedly installed at one end of the rotating shaft 5. The nut is located on the side of the linkage sleeve II8 away from the linkage sleeve I7. The nut limits the linkage sleeve I7, the inner ring of the bearing 9 and the linkage sleeve II8 to prevent the linkage sleeve I7, the inner cavity of the bearing 9 and the linkage sleeve II8 from moving horizontally along the rotating shaft 5 during the operation of the motor, and does not affect the later disassembly of the motor.

[0031] Two limiting ring plates Ⅰ10 are movably installed inside the shell 1, and one side of the two limiting ring plates Ⅰ10 is respectively fitted with the inner sides of the two shell covers 2, and the inner side of the limiting ring plate Ⅰ10 is close to the outer side of the ring plate part 701 on the linkage sleeve Ⅱ8 without touching it. Limiting ring plates Ⅱ11 are movably installed inside the shell 1 on both sides of the stator 3, and a wire groove 111 is provided on the limiting ring plate Ⅱ11, and a wire hole 101 connected to the wire groove 111 is provided on the shell 1, so that the wires wound on the stator 3 can extend out of the outside of the shell 1 through the wire groove 111 and the wire hole 101, and the inner side of the limiting ring plate Ⅱ11 is close to the outer side of the ring plate part 701 on the linkage sleeve Ⅰ7 without touching it.

[0032] The housing 1 is internally movably installed with a limiting sleeve Ⅰ12 and a limiting sleeve Ⅱ13 located between the limiting ring plate Ⅰ10 and the limiting ring plate Ⅱ11. One side of the limiting sleeve Ⅰ12 is in contact with the side of the limiting ring plate Ⅱ11 away from the stator 3. The limiting sleeve Ⅰ12 is movably sleeved on the outside of the linkage sleeve Ⅰ7. One side of the limiting sleeve Ⅱ13 is in contact with the side of the limiting ring plate Ⅰ10 away from the shell cover 2. The limiting sleeve Ⅰ12 is in contact with the opposite surface of the limiting sleeve Ⅱ13. The limiting sleeve Ⅱ13 is movably sleeved on the outside of the linkage sleeve Ⅱ8, and the limiting sleeve Ⅰ12 has the same structure as the limiting sleeve Ⅱ13. The limiting sleeve Ⅰ12 and the limiting sleeve Ⅱ13 are symmetrically arranged with respect to each other's opposite surfaces. The outer ring of the bearing 9 is arranged It is arranged on the inner side between the limiting sleeve Ⅰ12 and the limiting sleeve Ⅱ13. When the shell cover 2 is fixed to the shell 1, the limiting ring plate Ⅰ10, the limiting sleeve Ⅱ13, the limiting sleeve Ⅰ12, the limiting ring plate Ⅱ11 and the stator 3 are in close contact to ensure that when the motor is running, the limiting ring plate Ⅰ10, the limiting sleeve Ⅱ13, the limiting sleeve Ⅰ12, the limiting ring plate Ⅱ11 and the stator 3 in the shell 1 are kept in a stable state. At the same time, the outer ring of the bearing 9 is also limited to ensure the normal and stable operation of the bearing 9. A limiting sealing ring 26 is provided on the outer side between the limiting sleeve Ⅰ12 and the limiting sleeve Ⅱ13 to ensure the sealing effect after the limiting sleeve Ⅰ12 and the limiting sleeve Ⅱ13 are spliced ​​together.

[0033] See also Figure 2-Figure 4 An annular cavity 14 is provided on one side of the limiting sleeve Ⅰ12, a circular groove 15 is provided on the other side of the limiting sleeve Ⅰ12, and a plurality of cylindrical cavities 16 connecting the annular cavity 14 and the circular groove 15 are provided on the limiting sleeve Ⅰ12. The number of the cylindrical cavities 16 is not less than two, and the plurality of cylindrical cavities 16 are distributed in a circular array on the limiting sleeve Ⅰ12.

[0034] See also Figure 2-Figure 5 The internal movable sleeve of the annular cavity 14 is provided with a piston sliding ring 17, and an oil sealing ring 18 is fixedly connected to one side of the piston sliding ring 17. The side of the oil sealing ring 18 away from the piston sliding ring 17 is movably fitted with one side of the ring plate portion 701, that is, the oil sealing ring 18 on the limiting sleeve Ⅰ12 and the ring plate portion 701 on the linkage sleeve Ⅰ7 form a movable seal on one side of the bearing 9, and the oil sealing ring 18 on the limiting sleeve Ⅱ13 and the ring plate portion 701 on the linkage sleeve Ⅱ8 form a movable seal on the other side of the bearing 9.

[0035] A linkage shaft 19 corresponding to the cylindrical cavity 16 is fixedly connected to the side of the piston sliding ring 17 away from the oil sealing ring 18. One end of the linkage shaft 19 away from the piston sliding ring 17 extends to the interior of the cylindrical cavity 16 and is fixedly installed with a piston slider 20. The piston slider 20 and the cylindrical cavity 16 are movably sealed. A positioning sealing ring 21 located between the piston sliding ring 17 and the piston slider 20 is movably sleeved on the linkage shaft 19, and the positioning sealing ring 21 is fixedly installed in the annular cavity 14 to form a partition between the annular cavity 14 and the cylindrical cavity 16.

[0036] An oil inlet hole 121 connected to the annular cavity 14 is formed at the top of the limiting sleeve Ⅰ12, a pipe joint Ⅰ22 is threadedly installed on the top of the shell 1, the bottom end of the pipe joint Ⅰ22 is threadedly sleeved with the oil inlet hole 121, and the pipe joint Ⅰ22 is used to connect the pipeline for the entry of lubricating oil, an oil outlet hole 131 connected to the annular cavity 14 is formed at the bottom of the limiting sleeve Ⅱ13, a pipe joint Ⅱ23 is threadedly installed on the bottom of the shell 1, the top end of the pipe joint Ⅱ23 is threadedly sleeved with the oil outlet hole 131, and the pipe joint Ⅱ23 is used to connect the pipeline for the discharge of lubricating oil.

[0037] Two groups of oil guide holes 24 are provided on the limiting sleeve Ⅰ12, and the number of the two groups of oil guide holes 24 is the same as the number of the cylindrical cavity 16. One group of oil guide holes 24 connects the annular cavity 14 and the inner side of the limiting sleeve Ⅰ12, and the other group of oil guide holes 24 connects the cylindrical cavity 16 and the inner side of the limiting sleeve Ⅰ12. The limiting sleeve Ⅱ13 is provided with the same oil guide holes 24 as the limiting sleeve Ⅰ12. A gap for the lubricating oil to flow is reserved between the inner side of the limiting sleeve Ⅰ12 and the outer side of the ring plate portion 701 on the linkage sleeve Ⅰ7, and a gap for the lubricating oil to flow is reserved between the inner side of the limiting sleeve Ⅱ13 and the outer side of the ring plate portion 701 on the linkage sleeve Ⅱ8.

[0038] The shell 1 is provided with a plurality of equidistantly arranged heat dissipation grooves 102, the number of the heat dissipation grooves 102 is not less than two, and the two outermost heat dissipation grooves 102 are respectively located on both sides of the stator 3, and the bottom of the shell 1 is provided with heat dissipation holes 103 connecting the heat dissipation grooves 102, and the shell 1 is provided with two guide grooves 25, and the two guide grooves 25 are respectively located at the two outermost heat dissipation grooves 102, and the two guide grooves 25 are respectively connected to the inlet pipe and the outlet pipe of the cooling water, and the cooling water is introduced through one of the guide grooves 25, and the heat dissipation grooves 102 are connected by the heat dissipation through holes 103, so that the cooling water flows through the heat dissipation grooves 102 on the shell 1 and is discharged through another guide groove 25, and the shell 1 is effectively cooled by circulating cooling water.

[0039] When in use, the lubricating oil for lubricating the bearing 9 is pumped from the oil inlet hole 121 through the pipeline to the annular cavity 14 on the limiting sleeve Ⅰ12, the lubricating oil flows through the oil guide hole 24 and flows from the gap between the ring plate portion 701 on the linkage sleeve Ⅰ7 and the limiting sleeve Ⅰ12 to the ball of the bearing 9, and cooperates with the inner ring of the bearing 9 to rotate with the rotating shaft 5, so that the lubricating oil effectively acts on the ball and the inner and outer rings of the bearing 9 for lubrication, and the lubricating oil after lubrication flows through the gap between the ring plate portion on the linkage sleeve Ⅱ8 and the limiting sleeve Ⅱ13 to the oil guide hole 24 on the limiting sleeve Ⅱ13, and is discharged from the oil outlet hole 131, thereby realizing the circulation pumping of the lubricating oil, continuously lubricating and cooling the bearing 9, so as to reduce the shaft when the motor is under high load. The wear and consumption of the bearing 9 is reduced, and the service life of the high-voltage mining permanent magnet synchronous variable frequency motor is increased. In the process of lubricating the bearing 9, when the lubricating oil is pumped, the lubricating oil will flow to the opposite sides of the piston sliding ring 17 and the piston sliding block 20 respectively, and the pressure of the lubricating oil pumping is controlled to remain unchanged, so the difference in oil pressure between the piston sliding ring 17 and the piston sliding block 20 is also fixed, and the pressure difference makes the piston sliding ring 17 and the piston sliding block 20 move synchronously toward the ring plate part 701, so as to utilize the oil pressure difference to provide the contact pressure between the oil sealing ring 18 and the ring plate part 701 to achieve sealing, even if the contact part between the oil sealing ring 18 and the ring plate part 701 is worn and consumed, the oil sealing ring 18 and the ring plate part 701 can still maintain a stable sealing state.

[0040] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-voltage permanent magnet synchronous variable frequency motor for mining, comprising a housing (1), housing covers (2) fixedly mounted at both ends of the housing (1), a stator (3) fixedly mounted in the middle of the inner cavity of the housing (1), a rotor (4) disposed on the inner side of the stator (3), a rotating shaft (5) mounted on the rotor (4), characterized in that: A linkage sleeve I (7) and a linkage sleeve II (8) are respectively provided at both ends of the rotating shaft (5); the linkage sleeve I (7) and the linkage sleeve II (8) have the same structure, and a bearing (9) mounted on the rotating shaft (5) is provided between the linkage sleeve I (7) and the linkage sleeve II (8); The linkage sleeve I (7) comprises two parts, a ring plate part (701) and a shaft sleeve part (702), and the inner ring of the bearing (9) is arranged between the two shaft sleeve parts (702); The housing (1) is internally provided with a limiting sleeve I (12) and a limiting sleeve II (13) which are located between a limiting ring plate I (10) and a limiting ring plate II (11), one side of the limiting sleeve I (12) is in contact with a side of the limiting ring plate II (11) away from the stator (3), the limiting sleeve I (12) is movably sleeved on the outside of the linkage sleeve I (7), one side of the limiting sleeve II (13) is in contact with a side of the limiting ring plate I (10) away from the housing cover (2), the limiting sleeve I (12) and the limiting sleeve II (13) are in contact with each other. The opposite surfaces of the fixed sleeve II (13) are fitted, the limiting sleeve II (13) is movably sleeved on the outside of the linkage sleeve II (8), and the limiting sleeve I (12) and the limiting sleeve II (13) have the same structure, the limiting sleeve I (12) and the limiting sleeve II (13) are symmetrically arranged with respect to the opposite surfaces of each other, the outer ring of the bearing (9) is arranged on the inner side between the limiting sleeve I (12) and the limiting sleeve II (13), and a limiting sealing ring (26) is arranged on the outer side between the limiting sleeve I (12) and the limiting sleeve II (13); An annular cavity (14) is formed on one side of the limiting sleeve I (12), a circular groove (15) is formed on the other side of the limiting sleeve I (12), and a plurality of cylindrical cavities (16) are formed on the limiting sleeve I (12) to communicate with the annular cavity (14) and the circular groove (15); The annular cavity (14) is movably sleeved with a piston sliding ring (17), one side of the piston sliding ring (17) is fixedly connected with an oil sealing ring (18), the side of the oil sealing ring (18) away from the piston sliding ring (17) is movably fitted with one side of the ring plate portion (701), the side of the piston sliding ring (17) away from the oil sealing ring (18) is fixedly connected with a linkage shaft (19) corresponding to the cylindrical cavity (16), one end of the linkage shaft (19) away from the piston sliding ring (17) extends into the interior of the cylindrical cavity (16) and is fixedly mounted with a piston slider (20), the piston slider (20) and the cylindrical cavity (16) are movably sealed, a positioning sealing ring (21) is movably sleeved on the linkage shaft (19) and is located between the piston sliding ring (17) and the piston slider (20), and the positioning sealing ring (21) is fixedly mounted in the annular cavity (14); One side of the two annular plate portions (701) is movably fitted with an oil seal ring (18), and the oil seal ring (18) is located on both sides of the bearing (9). A piston slide ring (17) and a piston slider (20) that move synchronously are provided on the side of the oil seal ring (18) away from the annular plate portion (701). When lubricating oil is pumped to lubricate the bearing (9), the lubricating oil flows to the opposite sides of the piston slide ring (17) and the piston slider (20), and the piston slide ring (17) and the piston slider (20) are moved synchronously toward the annular plate portion (701) by utilizing the pressure difference between the piston slide ring (17) and the piston slider (20).

2. A high voltage permanent magnet synchronous variable frequency motor for mining according to claim 1, characterized in that: The two shell covers (2) are each provided with a dustproof sealing ring (6), and the inner side of the dustproof sealing ring (6) is movably fitted with the outer side of the shell (1).

3. A high voltage permanent magnet synchronous variable frequency motor for mining according to claim 1, characterized in that: The outer diameter of the annular plate portion (701) is greater than the outer diameter of the shaft sleeve portion (702), and the annular plate portion (701) and the shaft sleeve portion (702) are integrally formed.

4. A high voltage permanent magnet synchronous variable frequency motor for mining according to claim 1, characterized in that: A nut is threadedly mounted on one end of the rotating shaft (5), and the nut is located on a side of the linkage sleeve II (8) away from the linkage sleeve I (7).

5. A high voltage permanent magnet synchronous variable frequency motor for mining according to claim 1, characterized in that: Two limiting ring plates I (10) are movably installed inside the shell (1), one side of the two limiting ring plates I (10) is respectively fitted with the inner sides of the two shell covers (2), and the inner sides of the limiting ring plates I (10) are close to the outer sides of the ring plate parts (701) on the linkage sleeve II (8) without contacting them. Limiting ring plates II (11) are movably installed inside the shell (1) and are located on both sides of the stator (3), the inner sides of the limiting ring plates II (11) are close to the outer sides of the upper ring plate parts (701) of the linkage sleeve I (7) without contacting them. A wire groove (111) is provided on the limiting ring plate II (11), and a wire hole (101) connected to the wire groove (111) is provided on the shell (1).

6. A high voltage permanent magnet synchronous variable frequency motor for mining according to claim 5, characterized in that: The shell (1) is provided with a plurality of equidistantly arranged heat dissipation grooves (102), the number of the heat dissipation grooves (102) being no less than two, and the two outermost heat dissipation grooves (102) being respectively located on both sides of the stator (3), the bottom of the shell (1) being provided with heat dissipation through holes (103) connecting the heat dissipation grooves (102), the shell (1) being provided with two guide grooves (25), and the two guide grooves (25) being respectively located at the two outermost heat dissipation grooves (102), the two guide grooves (25) being respectively connected to an inlet pipe and an outlet pipe of cooling water, and the cooling water is introduced through one of the guide grooves (25).

7. A high voltage permanent magnet synchronous variable frequency motor for mining according to claim 1, characterized in that: The number of the cylindrical cavities (16) is not less than two, and a plurality of cylindrical cavities (16) are distributed in a circular array on the limiting sleeve I (12).

8. A high voltage permanent magnet synchronous variable frequency motor for mining according to claim 1, characterized in that: The top of the limiting sleeve I (12) is provided with an oil inlet hole (121) connected to the annular cavity (14); the top of the housing (1) is threadedly mounted with a pipe joint I (22); the bottom end of the pipe joint I (22) is threadedly sleeved with the oil inlet hole (121); the pipe joint I (22) is used to connect to a pipeline for lubricating oil to enter; the bottom of the limiting sleeve II (13) is provided with an oil outlet hole (131) connected to the annular cavity (14); the bottom of the housing (1) is threadedly mounted with a pipe joint II (23); the top end of the pipe joint II (23) is threadedly sleeved with the oil outlet hole (131); the pipe joint II (23) is used to connect to a pipeline for lubricating oil to be discharged; the limiting sleeve I (12) is provided with a There are two groups of oil guide holes (24), and the number of the two groups of oil guide holes (24) is the same as the number of the cylindrical cavity (16). One group of oil guide holes (24) connects the annular cavity (14) and the inner side of the limiting sleeve I (12), and the other group of oil guide holes (24) connects the cylindrical cavity (16) and the inner side of the limiting sleeve I (12). The limiting sleeve II (13) is provided with the same oil guide holes (24) as the limiting sleeve I (12). A gap for lubricating oil to flow is reserved between the inner side of the limiting sleeve I (12) and the outer side of the ring plate portion (701) on the linkage sleeve I (7). A gap for lubricating oil to flow is reserved between the inner side of the limiting sleeve II (13) and the outer side of the ring plate portion (701) on the linkage sleeve II (8).

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