A waterproof device for a permanent magnet direct drive motor

Abstract

The application relates to a waterproof device of a permanent magnet direct drive motor, and relates to the technical field of waterproof devices, and aims to solve the problem that the permanent magnet direct drive motor for a submersible pump is easily penetrated by liquid when working under a tree, resulting in damage of the motor and low safety. The waterproof device comprises a shell and a cover, the surface of the shell is provided with a mounting cavity, a motor body is arranged in the mounting cavity, a partition plate is arranged on the inner wall of the mounting cavity, and a water blocking cover is arranged on the surface of the partition plate; a water accumulation groove is arranged on the surface of the partition plate, a water accumulation cavity is arranged in the shell, a flow-through hole is arranged on the inner wall of the water accumulation cavity, the flow-through hole communicates the water accumulation cavity with the water accumulation groove, a valve is arranged on the bottom wall of the water accumulation cavity, and a water blocking assembly is arranged in the water accumulation cavity; the bottom wall of the cover is provided with an abutting ring which is inserted into the mounting cavity, the bottom wall of the cover is provided with locking pieces for fixing the shell and the cover, and the side of the cover away from the shell is provided with a flow guide surface. The application has the effects of improving the waterproof capability of the permanent magnet direct drive motor and improving work safety.

Description

Technical Field

[0001] This application relates to the field of waterproofing devices, and more particularly to a waterproofing device for a permanent magnet direct drive motor. Background Technology

[0002] A permanent magnet direct drive motor is a type of motor that uses permanent magnets, natural magnets, or artificial magnets as its stator. These motors are widely used in instruments, meters, and lighting equipment because of their small size, high torque, high speed, simple drive, and reversible direction.

[0003] In related technologies, permanent magnet direct drive motors can be used to power submersible pumps. Submersible pumps usually need to operate underwater, and liquid may enter the motor through the gap between the reducer and the output shaft of the permanent magnet motor, causing internal motor failure. Therefore, there is an urgent need for a waterproof device for permanent magnet direct drive motors to protect the motor from water damage. Summary of the Invention

[0004] In order to provide waterproof protection for permanent magnet direct drive motors, improve the safety of permanent magnet direct drive motors during operation, and extend their service life, this application provides a waterproof device for permanent magnet direct drive motors.

[0005] The waterproof device for a permanent magnet direct drive motor provided in this application adopts the following technical solution:

[0006] A waterproof device for a permanent magnet direct drive motor includes a housing and a cover. The housing has a mounting cavity on its surface, where a motor body is installed. A partition plate is provided on the inner wall of the mounting cavity, and a water-blocking cover is provided on the surface of the partition plate facing away from the motor body. A water-collecting groove is formed on the circumferential surface of the partition plate. A water-collecting cavity is provided inside the housing, surrounding the mounting cavity. A flow hole is formed on the inner wall of the water-collecting cavity, connecting the water-collecting cavity to the water-collecting groove. A valve is provided on the bottom wall of the water-collecting cavity, and a water-blocking component is provided inside the water-collecting cavity to prevent water from flowing from the water-collecting cavity into the water-collecting groove. An abutment ring is provided on the bottom wall of the cover, inserted into the mounting cavity and abutting against the inner wall of the mounting cavity. A locking member is provided on the bottom wall of the cover to fix the housing and the cover. A guide surface is formed on the side of the cover facing away from the housing. The output shaft of the motor body passes through the partition plate, the water-blocking cover, and the cover in sequence.

[0007] By adopting the above technical solution, external liquid will preferentially contact the cover and flow along the guide surface of the cover, thereby waterproofing the motor body. A small amount of water will enter the mounting cavity through the gap between the cover and the output shaft of the motor body. After being blocked by the water baffle, the liquid flows into the water collection tank and then into the water collection cavity through the flow hole. By setting the water baffle component, the water inside the water collection cavity can be prevented from flowing back into the water collection tank. Thus, the water baffle and the water baffle component provide a further waterproofing effect for the motor body. The water inside the water collection cavity will eventually be discharged into the housing by the valve. The waterproofing device of this application waterproofs the motor body through both water blocking and drainage. The cover, water baffle, and partition plate can effectively separate the liquid from the motor body, while the valve can drain the small amount of water that enters the housing, thereby reducing the probability of water evaporation and damage to the motor body. The combination of the two achieves an effective waterproofing effect, ensuring the safety of the motor body during operation and extending the service life of the motor body.

[0008] Preferably, the water-blocking cover includes an abutting part and a flow-guiding part. The bottom wall of the abutting part is provided with an installation ring in the circumferential direction. The surface of the partition plate is provided with an annular groove for the installation ring to be inserted in the circumferential direction. The diameter of the abutting part gradually decreases from the end near the partition plate to the end away from the partition plate. The flow-guiding part is connected to the side of the abutting part away from the partition plate. A flow-guiding arc surface is provided at the connection between the flow-guiding part and the abutting part.

[0009] By adopting the above technical solution, an installation ring is set on the bottom wall of the abutment part, which can improve the connection tightness between the abutment part and the partition plate, reduce the probability of water damage to the motor body inside the installation cavity through the gap between the water baffle and the partition plate. At the same time, the diameter change of the abutment part and the flow guiding arc surface of the guide part cooperate with each other to play a better drainage role, so that the water can flow along the inclined direction to the water collection tank and finally enter the water collection cavity, which has high practicality and safety.

[0010] Preferably, the partition plate has a through-hole along its thickness direction, and a rotating bearing is installed in the through-hole. The end wall of the rotating bearing extending out of the through-hole abuts against the inner top wall of the abutment portion. The output shaft of the motor body passes through the inner ring of the rotating bearing. An oil cavity is provided on the bottom wall of the guide portion. The oil cavity is filled with lubricating oil for lubricating the rotating bearing. A sealing ring is provided in the oil cavity. The sealing ring abuts against the top wall of the oil cavity. An embedding groove for the sealing ring to engage is provided on the outer wall of the output shaft of the motor body along the circumferential direction.

[0011] By adopting the above technical solution and setting a rotating bearing, the wear between the output shaft of the motor body and the partition plate during rotation can be effectively improved, which would lead to a larger gap between the two and make it easier for water to accumulate and damage the motor body. This solution has high practicality and safety. By opening an oil cavity and sealing ring, on the one hand, it can reduce the problem of water entering the mounting cavity through the gap between the guide part and the output shaft of the motor body, thus reducing the damage to the motor body. On the other hand, the rotating bearing can work stably through lubrication, and can reliably reduce the wear of the output shaft of the motor body.

[0012] Preferably, the outer wall of the rotating bearing located within the abutment portion is fitted with an oil seal, and the oil seal abuts against the inner wall of the abutment portion.

[0013] By adopting the above technical solution, setting an oil seal can effectively reduce the probability of lubricating oil leaking from the rotating bearing and the oil cavity. At the same time, it can also prevent external water from entering the rotating bearing through the gap between the contact part and the partition plate, thereby preventing damage to the motor body. This further improves the waterproof effect of the waterproof device of this application.

[0014] Preferably, the water-blocking assembly includes a fixed ring plate and a movable ring plate sleeved on the outer wall of the mounting cavity. The fixed ring plate is connected to the inner wall of the water accumulation cavity. The fixed ring plate is located on the side of the flow hole away from the cover, and the movable ring plate is located on the side of the fixed ring plate away from the flow hole. The movable ring plate can slide along the length direction of the outer wall of the mounting cavity. A first water hole is formed through the fixed ring plate in the thickness direction. A second insert is provided on the top wall of the movable ring plate. The second insert can be inserted into the first water hole. A second water hole is formed through the movable ring plate in the thickness direction. A plurality of first inserts are provided on the bottom wall of the fixed ring plate. The first inserts can be inserted into the second water holes.

[0015] By adopting the above technical solution, the accumulated water flows from the water collection tank into the water collection cavity through the flow hole, and then enters the bottom wall of the water collection cavity through the first water hole and the second water hole, waiting for the valve to discharge it. When there is a lot of water in the water collection cavity, there is a possibility that the water may flow back into the water collection tank. Therefore, the movable ring plate will move towards the fixed ring plate under the buoyancy of the water. When the first insert block is inserted into the second water hole, and the second insert block is inserted into the second water hole, the fixed ring plate and the movable ring plate will ensure that the water can only stay below the movable ring plate, so that the water cannot flow back into the water collection tank. This plays a one-way guiding role for the water, effectively protecting the structural safety of the motor body in the installation cavity, and has high practicality.

[0016] Preferably, the water-blocking assembly further includes a limiting rod, one end of which is connected to the bottom wall of the fixed ring plate, and the other end of which passes through the movable ring plate and is connected to the bottom wall of the water accumulation chamber. The movable ring plate can slide along the length direction of the limiting rod.

[0017] By adopting the above technical solution, the limiting rod can restrict the movement direction of the movable ring plate, preventing the movable ring plate from rotating. This allows the first and second insert blocks to be inserted more accurately into the corresponding first or second water hole, thereby further improving the water-blocking function of the water-blocking assembly and making it highly practical.

[0018] Preferably, the valve includes a valve body, two guide shields, a drain block, a clamping post, an elastic element, and a mounting plate. The inlet of the valve body communicates with the water accumulation chamber. One of the guide shields is connected to the inner wall of the inlet of the valve body, and the other guide shield is connected to the inner wall of the outlet of the valve body. The ends of the two guide shields that are close to each other are constricted. The drain block is connected between the two guide shields. The drain block is hollow inside and communicates with the two guide shields. The clamping post passes through the guide shield and the drain block opposite to the outer shell in sequence. The abutment is inserted into the flow guide near the outer shell. The diameter of one part of the outer wall of the abutment is larger than the diameter of the constricted part of the flow guide near the outer shell. The end wall of the abutment away from the outer shell has a reset hole for the installation of the elastic element. The mounting piece is connected to the inner wall of the flow guide away from the outer shell. One end of the elastic element extends out of the reset hole and is connected to the mounting piece. The outer wall of the abutment located inside the drainage block has a drainage hole through it along the thickness direction. The drainage hole is connected to the reset hole. The mounting piece has several water outlet holes through it along the thickness direction.

[0019] By adopting the above technical solution, when there is a lot of water in the water accumulation chamber, the water will exert pressure on the clamping column, thereby pushing the clamping column towards the mounting plate. At this time, the elastic element will also be compressed, and the water will enter the drainage block, enter the reset hole through the drainage hole on the side wall of the clamping column, and finally be discharged through the water removal hole on the surface of the mounting plate. When there is less water in the water accumulation chamber, the pressure generated by the water will not be enough to continue to compress the elastic element. At this time, the clamping column will rebound under the elastic force of the elastic element and prevent the water from entering the drainage block further. Conversely, after the external liquid enters the drainage block, it cannot push the clamping column in the reverse direction, thereby enabling the valve to have the ability of unidirectional liquid flow, improving the problem of external liquid backflow and causing damage to the motor body inside the shell, and further improving the waterproof effect of the waterproof device of this application.

[0020] Preferably, the inner wall of the water accumulation chamber is inclined toward the water inlet of the valve body.

[0021] By adopting the above technical solution, the water inside the water accumulation chamber will flow towards the valve body inlet, thereby enabling the clamping column to withstand more pressure and allowing the water in the water accumulation chamber to be discharged quickly. This improves the problem of excessive water accumulation in the water accumulation chamber, which leads to damage to the motor body, and has high practicality.

[0022] Preferably, the locking component includes an insert, a snap-fit ​​block, and a return torsion spring. The insert is connected to the bottom wall of the cover. The outer surface of the housing has a connecting groove for inserting the insert. The inner wall of the connecting groove has a clearance groove. The snap-fit ​​block is rotatably connected to the inner wall of the clearance groove. The side wall of the insert has a locking groove for the snap-fit ​​block to abut against. The return torsion spring is connected to the snap-fit ​​block and is used to drive the snap-fit ​​block to disengage from the clearance groove and abut against the locking groove.

[0023] By adopting the above technical solution, the insert can achieve a tight connection between the cover and the outer shell. After the snap-fit ​​block is inserted into the locking groove, the connection between the cover and the outer shell can be made tighter, reducing the probability that liquid will enter the installation cavity through the gap between the cover and the outer shell and cause damage to the motor body, and further improving the waterproof performance of the waterproof device of this application.

[0024] Preferably, the abutting ring is located directly above the water accumulation tank, and the inner wall of the abutting ring is provided with a plurality of guide plates. The end of the guide plate away from the abutting ring is inclined toward the bottom wall of the cover. The outer wall of the output shaft of the motor body is fitted with a guide ring, the guide ring abuts against the bottom wall of the cover, and the outer wall of the guide ring is connected to the guide plate.

[0025] By adopting the above technical solution, when liquid seeps in from the gap of the cover, since the amount of liquid is small, it will flow along the length of the guide plate and fall into the water collection tank, reducing the probability of liquid contacting the water-blocking cover, thereby further improving the waterproof capability of this application.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. By setting up a cover and a water-blocking cover, external liquids can be isolated from the motor body, thereby directly preventing liquids from seeping into the motor body and causing damage to the motor body. This protects the safety of the motor body during operation, extends the service life of the motor body, and has high safety and economic benefits.

[0028] 2. By setting up water-blocking components and valves, the water entering the water accumulation chamber can only flow in one direction, reducing the probability of water flowing back into the water accumulation tank and causing damage to the motor body. This forms a drainage structure, which, combined with water-blocking structures such as the cover and water-blocking cover, effectively achieves the waterproofing of the motor body through water blocking and drainage. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a waterproof device for a permanent magnet direct drive motor according to an embodiment of this application.

[0030] Figure 2 This is a schematic diagram of the outer casing of an embodiment of this application.

[0031] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0032] Figure 4 This is a schematic diagram of the structure of the guide plate and guide ring according to an embodiment of this application.

[0033] Figure 5 yes Figure 1 A magnified view of a section at point B.

[0034] Explanation of reference numerals in the attached drawings: 1. Outer shell; 11. Mounting cavity; 12. Water collection cavity; 13. Flow hole; 14. Connecting groove; 15. Relief groove; 2. Cover; 21. Abutment ring; 22. Guide surface; 23. Guide plate; 24. Guide ring; 3. Motor body; 31. Embedded groove; 4. Partition plate; 41. Water collection trough; 42. Ring groove; 43. Mounting hole; 44. Rotary bearing; 45. Oil seal; 5. Water baffle; 51. Abutment part; 511. Mounting ring; 52. Guide part; 521. Guide arc surface; 522. Oil cavity; 5 23. Sealing ring; 6. Valve; 61. Valve body; 62. Flow guide; 63. Drain block; 64. Pressing post; 641. Reset hole; 642. Drain hole; 65. Elastic element; 66. Mounting piece; 661. Water outlet; 7. Water blocking assembly; 71. Fixed ring plate; 711. First water hole; 712. First insert block; 72. Movable ring plate; 721. Second water hole; 722. Second insert block; 73. Limiting rod; 8. Locking element; 81. Insert piece; 811. Locking groove; 82. Snap-fit ​​block; 83. Reset torsion spring. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0036] This application discloses a waterproof device for a permanent magnet direct drive motor. (Refer to...) Figure 1 A waterproof device for a permanent magnet direct drive motor includes a housing 1 and a cover 2. The housing 1 has an internal mounting cavity 11. The stator of the motor body 3 is welded to the bottom wall of the mounting cavity 11, and the rotor of the motor body 3 extends out of the mounting cavity 11. The cover 2 covers the outer wall of the opening of the mounting cavity 11, and the rotor of the motor body 3 passes through the cover 2. An abutment ring 21 is integrally formed on the bottom wall of the cover 2, arranged along the circumferential direction of the cover 2. The abutment ring 21 is inserted into the mounting cavity 11 and abuts against the inner wall of the mounting cavity 11. A guide surface 22 is provided on the side of the cover 2 facing away from the housing 1. The guide surface 22 is inclined from the center of the cover 2 towards the circumferential wall, allowing liquid to flow along the direction of the guide surface 22, thereby reducing the penetration of external liquid into the housing 1 and the cover 2, and effectively waterproofing the motor body 3.

[0037] Reference Figure 2 and Figure 3 A locking element 8 is provided between the cover 2 and the outer shell 1 to improve connection stability. The locking element 8 includes several inserts 81, several locking blocks 82, and several return torsion springs 83. The inserts 81 are integrally formed on the bottom wall of the cover 2 and are evenly distributed along the circumferential direction of the cover 2. The surface of the outer shell 1 has several connecting grooves 14 for inserting the inserts 81. The inner wall of the connecting grooves 14 has a relief groove 15. The locking blocks 82 are rotatably connected to the inner wall of the relief groove 15. The side wall of the inserts 81 has a locking groove 811 for the locking blocks 82 to abut against. The groove 811 and the snap-fit ​​block 82 are matched in shape. The reset torsion spring 83 is connected to the rotational connection between the snap-fit ​​block 82 and the inner wall of the relief groove 15. When the insert 81 is inserted into the connecting groove 14, the insert 81 abuts against the snap-fit ​​block 82. The snap-fit ​​block 82 will temporarily retract into the relief groove 15 under the force of the insert 81. When the relief groove 15 is aligned with the locking groove 811, the snap-fit ​​block 82 will pop out of the relief groove 15 and abut into the locking groove 811 under the action of the reset torsion spring 83, thereby locking the cover 2 and the outer shell 1 and improving the connection stability.

[0038] Reference Figure 1 and Figure 4 The bottom wall of the cover 2 is integrally formed with a guide ring 24. The guide ring 24 is coaxially arranged with the abutment ring 83. The guide ring 24 is sleeved on the outer wall of the output shaft of the motor body 3. The outer wall of the guide ring 24 is integrally formed with several guide pieces 23. The other end of the guide piece 23 is inclined towards the bottom wall of the mounting cavity 11 and connected to the bottom wall of the abutment ring 83, so that water droplets entering the mounting cavity 11 through the gap between the output shaft of the motor body 3 and the cover 2 can slide along the length direction of the guide piece 23, thereby reducing the damage to the motor body 3.

[0039] Reference Figure 1 and Figure 5 A partition plate 4 is welded to the inner wall of the mounting cavity 11. The partition plate 4 is located on the side of the motor body 3 near the cover 2. The output shaft of the motor body 3 passes through the partition plate 4. The partition plate 4 has a mounting hole 43 through it along the thickness direction. A rotating bearing 44 is welded to the inner wall of the mounting hole 43. The output shaft of the motor body 3 is connected to the partition plate 4 by a key connection, which can reduce the wear between the output shaft of the motor body 3 and the partition plate 4. Thus, the partition plate 4 further protects the motor body 3.

[0040] Reference Figure 1 and Figure 5A water-blocking cover 5 is provided on the surface of the partition plate 4 facing away from the motor body 3. The water-blocking cover 5 is coaxially arranged with the partition plate 4, and the output shaft of the motor body 3 passes through the water-blocking cover 5. The water-blocking cover 5 includes an abutment part 51 and a guide part 52, which are integrally formed. The diameter of the abutment part 51 gradually decreases from the end near the partition plate 4 toward the end facing away from the partition plate 4, thereby guiding the liquid falling on the surface of the abutment part 51. An installation ring 511 is integrally formed on the bottom wall of the abutment part 51. An annular groove 42 is opened on the surface of the partition plate 4 for the installation ring 511 to be embedded. The shape of the installation ring 511 and the annular groove 42 are adapted to each other, thereby reducing the problem of water entering below the partition plate 4 through the gap between the abutment part 51 and the partition plate 4, which could damage the motor body 3. The abutment part 51 is sleeved on the outside of the rotating bearing 44, and one end of the rotating bearing 44 extends out of the partition plate 4 and abuts against the inner wall of the abutment part 51.

[0041] Reference Figure 1 and Figure 5 The guide section 52 is connected to the abutment section 51 at one end away from the partition plate 4. The diameter of the guide section 52 is smaller than the diameter of any part of the abutment section 51. A guide arc surface 521 for guiding the liquid is provided at the connection between the guide section 52 and the abutment section 51, so that the liquid can flow along the guide arc surface 521. An oil cavity 522 is provided on the bottom wall of the guide section 52. Lubricating oil is injected into the oil cavity 522. The lubricating oil contacts the rotating bearing 44, thereby lubricating the rotating bearing 44 and maintaining the working effect of the rotating bearing 44. The motor body 3 is located in the oil cavity 522. The outer wall of the inner cavity is provided with an embedding groove 31 along the circumferential direction. A sealing ring 523 is fitted inside the embedding groove 31. The side wall of the sealing ring 523 abuts against the inner wall of the oil cavity 522, and the top wall abuts against the inner top wall of the oil cavity 522. This can improve the problem of liquid entering the oil cavity 522 through the gap between the guide part 52 and the output shaft of the motor body 3. An oil seal 45 is fitted on the outer wall of the rotating bearing 44 extending out of the mounting hole 43. This can prevent the leakage of lubricating oil and also prevent liquid from entering below the partition plate 4 through the rotating bearing 44, which could damage the motor body 3.

[0042] Reference Figure 1 and Figure 5 A water collection groove 41 is formed along the circumferential direction on the surface where the partition plate 4 connects to the inner wall of the mounting cavity 11. The water collection groove 41 is located directly below the abutment ring 21 and can collect liquid that slides down along the guide plate 23. A water collection cavity 12 is formed inside the outer shell 1, which surrounds the outer wall of the mounting cavity 11. A flow hole 13 is formed through the outer wall of the mounting cavity 11 along the thickness direction to connect the water collection groove 41 and the water collection cavity 12, so that the water in the water collection groove 41 can flow into the water collection cavity 12. A valve 6 is connected to the bottom wall of the water collection cavity 12, and the bottom wall of the water collection cavity 12 is inclined towards the water inlet of the valve 6.

[0043] Reference Figure 1 and Figure 5 The valve 6 includes a valve body 61, two guide shields 62, a drain block 63, a clamping column 64, an elastic element 65, and a mounting plate 66. The valve body 61 is a hollow pipe and is connected to the water accumulation chamber 12. One of the guide shields 62 is welded to the inner wall of the inlet of the valve body 61, and the other guide shield 62 is welded to the inner wall of the outlet of the valve body 61. The openings of the two guide shields 62 that are close to each other are both set in a constricted shape, and the constricted diameter of the guide shield 62 that is close to the water accumulation chamber 12 is smaller than the diameter of the guide shield 62 that is away from the water accumulation chamber 12.

[0044] Reference Figure 1 and Figure 5 The drainage block 63 is welded between the two guide shields 62. The drainage block 63 is hollow inside and communicates with the guide shields 62. The clamping column 64 is inserted from the guide shield 62 away from the water accumulation cavity 12 into the guide shield 62 at the other end. The clamping column 64 can slide freely in the guide shield 62 away from the water accumulation cavity 12. The end of the clamping column 64 inserted into the guide shield 62 near the water accumulation cavity 12 is arc-shaped and can abut against the inner wall of the guide shield 62, thereby stopping the movement of the clamping column 64. The end wall of the clamping column 64 away from the water accumulation cavity 12 has a reset hole 641 for the installation of the elastic element 65. In this embodiment, the elastic element 65 is a spring. One end of the elastic element 65 is glued to the bottom wall of the reset hole 641. The mounting piece 66 is set on the inner wall of the guide shield 62 away from the water accumulation cavity 12 and is welded to the guide shield. The inner wall of the valve 62 is connected, and the elastic element 65 passes through the drain block 63 and is connected to the surface of the mounting plate 66 by adhesive, so that the clamping column 64 can move towards the mounting plate 66 under the action of water pressure. The side wall of the clamping column 64 located inside the drain block 63 has a drain hole 642 that is connected to the reset hole 641. The mounting plate 66 has several water outlet holes 661 that are opened through it along the thickness direction. When the elastic element 65 is compressed, the clamping column 64 is pushed into the drain block 63, and the accumulated water will enter the drain block 63 and flow through the drain hole 642 and the reset hole 641, and finally be discharged from the valve body 61 through the water outlet hole 661. The valve 6 of this application has the ability to allow the accumulated water to flow in only one direction, which can effectively prevent the external liquid from flowing back into the housing and play a good protective role for the internal motor body 3.

[0045] Reference Figure 1 and Figure 5The water accumulation cavity 12 is equipped with a water-blocking assembly 7 to prevent water from flowing back into the water accumulation tank 41. The water-blocking assembly 7 includes a fixed ring plate 71, a movable ring plate 72, and several limiting rods 73. The fixed ring plate 71 is sleeved on the outer wall of the mounting cavity 11 and is welded to the inner wall of the water accumulation cavity 12 and the outer wall of the mounting cavity 11, respectively. The fixed ring plate 71 is located on the side of the flow hole 13 near the water accumulation cavity 12. The several limiting rods 73 are all welded to the bottom wall of the fixed ring plate 71, and the other end of the limiting rods 73 is connected to the bottom wall of the fixed ring plate 71. The movable ring plate 72 is welded to the bottom wall of the water accumulation chamber 12 and is sleeved on the outer wall of the mounting cavity 11 and can slide along the length direction of the limiting rod 73. The movable ring plate 72 is located on the side of the fixed ring plate 71 away from the flow hole 13. The fixed ring plate 71 has several first water holes 711 through it along the thickness direction, and the movable ring plate 72 has several second water holes 721 through it along the thickness direction. After the water enters the water accumulation chamber 12, it will enter the bottom wall of the water accumulation chamber 12 through the first water holes 711 and the second water holes 721 in sequence, waiting to be discharged.

[0046] Reference Figure 1 and Figure 5 The bottom wall of the fixed ring plate 71 is integrally formed with several first inserts 712, each first insert 712 corresponding to a second water hole 721. The top wall of the movable ring plate 72 is integrally formed with several second inserts 722, each second insert 722 corresponding to a first water hole 711. When there is a lot of water inside the water accumulation chamber 12, the movable ring plate 72 will rise under the buoyancy of the water, so that the first inserts 712 are inserted into the second water holes 721 and the second inserts 722 are inserted into the first water holes 711. This makes it difficult for the water below the movable ring plate 72 to pass through and flow back into the water accumulation tank 41. The movable ring plate 72 will only descend after the water is discharged through the valve 6, thus effectively protecting the motor body 3 inside the mounting cavity 11. In this embodiment, there is a gap between the first water hole 711 and the second insert block 722, and a gap between the second water hole 721 and the first insert block 712, so that a small amount of accumulated water can continue to flow to the bottom of the movable ring plate 72 to increase the water pressure.

[0047] The implementation principle of the waterproof device for a permanent magnet direct drive motor in this application embodiment is as follows: When the motor body 3 is operating underwater, the external liquid will first come into contact with the cover 2. Most of the liquid will flow away along the guide surface 22, and a small amount of liquid will enter the mounting cavity 11 through the gap between the cover 2 and the output shaft of the motor body 3. The liquid entering the partition plate 4 will flow along the guide plate 23 and fall into the water collection tank 41. A small amount of liquid will fall on the surface of the water baffle 5 and flow along the inclined part of the guide arc surface 521 and the contact part 51, and enter the water collection tank 41.

[0048] Water in the water collection tank 41 flows into the water collection cavity 12 through the flow hole 13, and then passes through the first water hole 711 and the second water hole 721 into the bottom wall of the water collection cavity 12. When the water level in the water collection cavity 12 rises, the movable ring plate 72 will float due to the buoyancy of the fixed ring plate 71, causing the first insert 712 to insert into the first water hole 711 and the second insert 722 to insert into the second water hole 721, preventing the water inside the water collection cavity 12 from flowing back into the water collection tank 41. When the pressure of the water in the water collection cavity 12 is sufficient to compress the elastic member 65, the abutment column will be pushed, and the water will be discharged into the outer casing 1 through the drain block 63. Similar to the structure of the water-blocking component 7, it can prevent the water from flowing back in and achieve the drainage function. The waterproof device for a permanent magnet direct drive motor of this application combines water blocking and drainage, which can efficiently achieve waterproofing, protect the safety of the motor body 3 during operation, extend the service life of the motor body 3, and has high safety and economic benefits.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A waterproof device for a permanent magnet direct drive motor, characterized in that: The device includes an outer shell (1) and a cover (2). An installation cavity (11) is formed on the surface of the outer shell (1). A motor body (3) is installed inside the installation cavity (11). A partition plate (4) is provided on the inner wall of the installation cavity (11). A water-blocking cover (5) is provided on the surface of the partition plate (4) facing away from the motor body (3). A water-collecting groove (41) is formed on the surface of the partition plate (4) in the circumferential direction. A water-collecting cavity (12) is provided inside the outer shell (1). The water-collecting cavity (12) surrounds the installation cavity (11). A flow hole (13) is formed on the inner wall of the water-collecting cavity (12). The flow hole (13) connects the water-collecting cavity (12) to the water-collecting groove (41). A valve (6) is provided on the bottom wall of the cavity (12), and a water-blocking component (7) is provided in the water accumulation cavity (12). The water-blocking component (7) is used to prevent water from flowing from the water accumulation cavity (12) into the water accumulation tank (41). An abutment ring (21) is provided on the bottom wall of the cover (2). The abutment ring (21) is inserted into the mounting cavity (11) and abuts against the inner wall of the mounting cavity (11). A locking member (8) is provided on the bottom wall of the cover (2) for fixing the outer shell (1) and the cover (2). A flow guide surface (22) is provided on the side of the cover (2) away from the outer shell (1). The output shaft of the motor body (3) passes through the partition plate (4), the water-blocking cover (5) and the cover (2) in sequence. The water-blocking cover (5) includes an abutting part (51) and a flow guiding part (52). The bottom wall of the abutting part (51) is provided with an installation ring (511) in the circumferential direction. The surface of the partition plate (4) is provided with an annular groove (42) for the installation ring (511) to be inserted in the circumferential direction. The diameter of the abutting part (51) gradually decreases from the end close to the partition plate (4) toward the end away from the partition plate (4). The flow guiding part (52) is connected to the side of the abutting part (51) away from the partition plate (4). A flow guiding arc surface (521) is provided at the connection between the flow guiding part (52) and the abutting part (51). The partition plate (4) has a mounting hole (43) through it along the thickness direction. A rotating bearing (44) is installed in the mounting hole (43). The end wall of the rotating bearing (44) extending out of the mounting hole (43) abuts against the inner top wall of the abutment part (51). The output shaft of the motor body (3) passes through the inner ring of the rotating bearing (44). An oil cavity (522) is provided on the bottom wall of the guide part (52). The oil cavity (522) is filled with lubricating oil for lubricating the rotating bearing (44). A sealing ring (523) is provided in the oil cavity (522). The sealing ring (523) abuts against the top wall of the oil cavity (522). An embedding groove (31) for the sealing ring (523) to be engaged is provided on the outer wall of the output shaft of the motor body (3) along the circumferential direction.

2. The waterproof device for a permanent magnet direct drive motor according to claim 1, characterized in that: The rotating bearing (44) is fitted with an oil seal (45) on the outer wall inside the abutment portion (51), and the oil seal (45) abuts against the inner wall of the abutment portion (51).

3. The waterproof device for a permanent magnet direct drive motor according to claim 1, characterized in that: The water-blocking assembly (7) includes a fixed ring plate (71) and a movable ring plate (72) sleeved on the outer wall of the mounting cavity (11). The fixed ring plate (71) is connected to the inner wall of the water accumulation cavity (12). The fixed ring plate (71) is located on the side of the flow hole (13) away from the cover (2). The movable ring plate (72) is located on the side of the fixed ring plate (71) away from the flow hole (13). The movable ring plate (72) can slide along the length of the outer wall of the mounting cavity (11). The fixed ring plate (71) has a first water hole (711) through it in the thickness direction. The top wall of the movable ring plate (72) is provided with a second insert (722), which can be inserted into the first water hole (711). The movable ring plate (72) has a second water hole (721) through it in the thickness direction. The bottom wall of the fixed ring plate (71) is provided with a plurality of first inserts (712), which can be inserted into the second water hole (721).

4. A waterproof device for a permanent magnet direct drive motor according to claim 3, characterized in that: The water-blocking assembly (7) also includes a limiting rod (73), one end of which is connected to the bottom wall of the fixed ring plate (71), and the other end of which passes through the movable ring plate (72) and is connected to the bottom wall of the water accumulation chamber (12). The movable ring plate (72) can slide along the length direction of the limiting rod (73).

5. A waterproof device for a permanent magnet direct drive motor according to claim 1, characterized in that: The valve (6) includes a valve body (61), two guide shields (62), a drain block (63), a clamping post (64), an elastic element (65), and a mounting plate (66). The inlet of the valve body (61) is connected to the water accumulation chamber (12). One of the guide shields (62) is connected to the inner wall of the inlet of the valve body (61), and the other guide shield (62) is connected to the inner wall of the outlet of the valve body (61). The ends of the two guide shields (62) that are close to each other are constricted. The drain block (63) is connected between the two guide shields (62). The drain block (63) is hollow inside and is connected to the two guide shields (62). The clamping post (64) passes through the guide shield (62) and the drain block (63) opposite to the outer shell (1) and is inserted. The guide shield (62) is located near the outer shell (1). The diameter of one part of the outer wall of the abutting post (64) is larger than the diameter of the constricted part of the guide shield (62) near the outer shell (1). The end wall of the abutting post (64) away from the outer shell (1) is provided with a reset hole (641) for the installation of the elastic element (65). The mounting piece (66) is connected to the inner wall of the guide shield (62) away from the outer shell (1). One end of the elastic element (65) extends out of the reset hole (641) and is connected to the mounting piece (66). The outer wall of the abutting post (64) located in the drain block (63) is provided with a drain hole (642) through the thickness direction. The drain hole (642) is connected to the reset hole (641). The mounting piece (66) is provided with a plurality of water outlet holes (661) through the thickness direction.

6. A waterproof device for a permanent magnet direct drive motor according to claim 5, characterized in that: The inner wall of the water accumulation chamber (12) is inclined toward the water inlet of the valve body (61).

7. A waterproof device for a permanent magnet direct drive motor according to claim 1, characterized in that: The locking component (8) includes a insert (81), a snap-fit ​​block (82), and a return torsion spring (83). The insert (81) is connected to the bottom wall of the cover (2). The outer shell (1) has a connecting groove (14) for inserting the insert (81). The inner wall of the connecting groove (14) has a clearance groove (15). The snap-fit ​​block (82) is rotatably connected to the inner wall of the clearance groove (15). The side wall of the insert (81) has a locking groove (811) for the snap-fit ​​block (82) to abut. The return torsion spring (83) is connected to the snap-fit ​​block (82). The return torsion spring (83) is used to drive the snap-fit ​​block (82) to disengage from the clearance groove (15) and abut into the locking groove (811).

8. A waterproof device for a permanent magnet direct drive motor according to claim 1, characterized in that: The abutment ring (21) is located directly above the water accumulation tank (41). The inner wall of the abutment ring (21) is provided with a number of guide plates (23). The end of the guide plate (23) away from the abutment ring (21) is inclined towards the bottom wall of the cover (2). The outer wall of the output shaft of the motor body (3) is fitted with a guide ring (24). The guide ring (24) abuts against the bottom wall of the cover (2). The outer wall of the guide ring (24) is connected to the guide plate (23).

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