Waterproof structure of permanent magnet direct drive motor
By installing a mounting sleeve and a multi-layer water-blocking mechanism outside the shell of the permanent magnet direct drive motor, the problem of insufficient waterproof performance of the motor is solved, and effective waterproofing effect is achieved and adapted to outdoor use environments.
Patent Information
- Application Number
- CN202422007195.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-19
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-19
AI Technical Summary
The existing permanent magnet direct drive motors have poor waterproof performance, which leads to easy water seepage between the motor shaft and the shell, affecting the reliability of long-term outdoor use.
Installation sleeves are installed outside the motor housing, which are placed outside the motor shaft, and a first- and second-level water-blocking mechanism is set, including a flow guide ring, a water-blocking ring, an outer water-blocking ring and an inner water-blocking ring. Combined with a check valve and a sealing ring, a multi-layer water-blocking structure is formed.
It effectively increases the water flow path, reduces moisture accumulation, ensures the waterproof effect of the motor shell and the shaft contact part, adapts to large external water volume, and extends the waterproof performance.
Smart Images
Figure CN223052842U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of permanent magnet motors, in particular to a waterproof structure for a permanent magnet direct drive motor. Background Art
[0002] The stator structure of a permanent magnet direct drive motor is similar to that of an ordinary induction motor. However, the rotor of a permanent magnet motor uses permanent magnets and does not require external power excitation. The structure is simpler and more compact, with high efficiency, high energy density, a wide speed regulation range, and good torque characteristics. Therefore, it is more suitable for occasions that require high efficiency and high power density, such as electric vehicles, wind power generation, etc.
[0003] However, due to the compact structure inside the outer shell of the existing permanent magnet direct drive motor, its waterproof performance is poor, resulting in easy water seepage at the position between the motor shaft and the outer shell, affecting the reliability of long-term outdoor use. Summary of the Utility Model
[0004] The technical problem to be solved by the utility model is, aiming at the above-mentioned existing technical deficiencies, to provide a waterproof structure for a permanent magnet direct drive motor, which can be installed outside the motor housing without changing the original structure of the permanent magnet direct drive motor and has strong versatility.
[0005] The technical solution adopted by the utility model is: to provide a waterproof structure for a permanent magnet direct drive motor, including an installation sleeve arranged outside the motor housing; the installation sleeve is coaxially sleeved outside the motor shaft; one end of the installation sleeve is hermetically fixed to the end of the motor housing, and a primary water blocking mechanism is arranged inside the other end; a secondary water blocking mechanism is arranged inside the primary water blocking mechanism; a first drainage check valve is communicated with the outer wall of the installation sleeve; the first drainage check valve is located between the primary water blocking mechanism and the secondary water blocking mechanism;
[0006] The primary water blocking mechanism includes a first diversion ring sleeved and fixed inside the end of the installation sleeve; the first diversion ring is coaxially sleeved outside the motor shaft; the inner diameter of the first diversion ring is larger than the diameter of the motor shaft; the inner side of the first diversion ring is a conical surface; a second diversion ring is coaxially arranged inside the first diversion ring; the second diversion ring is sleeved and fixed on the motor shaft; the outer diameter of the second diversion ring is smaller than the inner diameter of the installation sleeve; one end of the second diversion ring close to the inner side surface of the first diversion ring is a conical surface structure and is parallel and corresponding to the inner side surface of the first diversion ring; an overflow gap is formed between the second diversion ring and the first diversion ring; a water blocking ring is coaxially fixed at the inner end of the first diversion ring; a positioning ring groove is coaxially opened on the second diversion ring; the water blocking ring is rotatably connected corresponding to the positioning ring groove;
[0007] The secondary water-blocking mechanism comprises a plurality of outer water-blocking rings which are sequentially sleeved and fixed on the inner wall of the mounting sleeve, and a plurality of inner water-blocking rings which are sequentially sleeved and fixed on the motor shaft; the outer water-blocking rings and the inner water-blocking rings are arranged alternately and spaced apart one by one; the outer wall of the mounting sleeve is connected with a plurality of second drainage one-way valves; the second drainage one-way valves correspond to the radial positions of the inner water-blocking rings in sequence.
[0008] To further optimize the technical solution, a sealing ring is provided between the first guide ring of a permanent magnet direct drive motor waterproof structure and the motor shaft; a support ring is fixedly sleeved on the outside of the sealing ring; and the support ring is fixed to the first guide ring by positioning screws.
[0009] To further optimize the technical solution, a second guide ring of a permanent magnet direct drive motor waterproof structure is covered and fixed with a water absorbent pad at one end close to the inner side of the first guide ring.
[0010] To further optimize the technical solution, a mounting sleeve of a waterproof structure of a permanent magnet direct-drive motor is made of a light-transmitting material.
[0011] The beneficial effects of the utility model are:
[0012] 1. The overflow gap formed by staggered installation of the first guide ring and the second guide ring can provide buffer space for external water when entering the installation sleeve, increase the water flow path, prevent water from reaching the deep of the installation sleeve too quickly, and also allow the first drainage check valve to have sufficient drainage time, effectively reducing the accumulation of water inside the installation sleeve. The end faces of the first guide ring and the second guide ring that are close to each other are conical surface structures. Compared with the straight surface structure, it can provide a larger buffer space, increase the water buffer capacity, extend the water flow path, and adapt to the situation of large external water volume.
[0013] 2. A water retaining ring is coaxially fixed to the inner end of the first guide ring, and a positioning ring groove is coaxially opened on the second guide ring. The water retaining ring is rotatably connected to the positioning ring groove. The water retaining ring can block most of the water entering the overflow gap to prevent excessive water influx in a short time from causing insufficient waterproofing.
[0014] 3. The outer water-blocking rings and the inner water-blocking rings are arranged alternately and spaced one by one, which can further block the water entering the installation sleeve step by step. Combined with the second drainage one-way valve corresponding to the radial position of the inner water-blocking ring, the water can be discharged step by step, ensuring the waterproof effect of the contact part between the motor housing and the motor shaft. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the utility model;
[0016] Figure 2 It is a schematic diagram of the structure of the water-absorbing pad.
[0017] In the figure, 1 is the motor housing; 2 is the motor shaft; 3 is the mounting sleeve; 4 is the first drainage check valve; 5 is the first diversion ring; 6 is the second diversion ring; 7 is the overflow gap; 8 is the water baffle ring; 9 is the positioning ring groove; 10 is the outer water blocking ring; 11 is the inner water blocking ring; 12 is the second drainage check valve; 13 is the sealing ring; 14 is the support ring; 15 is the positioning screw; 16 is the water absorption pad. Detailed implementation manners
[0018] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.
[0019] As Figure 1 shown, a waterproof structure for a permanent magnet direct drive motor includes a mounting sleeve 3 arranged outside the motor housing 1; the mounting sleeve 3 is coaxially sleeved outside the motor shaft 2; one end of the mounting sleeve 3 is hermetically fixed to the end of the motor housing 1, and a primary water blocking mechanism is arranged inside the other end; a secondary water blocking mechanism is arranged inside the primary water blocking mechanism; a first drainage check valve 4 is communicated with the outer wall of the mounting sleeve 3; the first drainage check valve 4 is located between the primary water blocking mechanism and the secondary water blocking mechanism;
[0020] As Figure 1 shown, the primary water blocking mechanism includes a first diversion ring 5 sleeved and fixed inside the end of the mounting sleeve 3; the first diversion ring 5 is coaxially sleeved outside the motor shaft 2; the inner diameter of the first diversion ring 5 is larger than the diameter of the motor shaft 2; the inner side of the first diversion ring 5 is a conical surface; a second diversion ring 6 is coaxially arranged inside the first diversion ring 5; the second diversion ring 6 is sleeved and fixed on the motor shaft 2; the outer diameter of the second diversion ring 6 is smaller than the inner diameter of the mounting sleeve 3; one end of the second diversion ring 6 close to the inner side of the first diversion ring 5 is of a conical surface structure and is parallel and corresponding to the inner side surface of the first diversion ring 5; an overflow gap 7 is formed between the second diversion ring 6 and the first diversion ring 5; a water baffle ring 8 is coaxially fixed at the inner end of the first diversion ring 5; a positioning ring groove 9 is coaxially formed on the second diversion ring 6; the water baffle ring 8 is rotatably connected corresponding to the positioning ring groove 9;
[0021] As Figure 1 shown, the secondary water blocking mechanism includes a plurality of outer water blocking rings 10 sleeved and fixed on the inner wall of the mounting sleeve 3 in sequence, and a plurality of inner water blocking rings 11 sleeved and fixed on the motor shaft 2 in sequence; the outer water blocking rings 10 and the inner water blocking rings 11 are staggered and spaced apart from each other one by one; a plurality of second drainage check valves 12 are communicated with the outer wall of the mounting sleeve 3; the second drainage check valves 12 correspond to the radial positions of the inner water blocking rings 11 in sequence.
[0022] When the permanent magnet direct drive motor is in a water - encountered environment, water will first pass through the gap between the first diversion ring 5 and the motor shaft 2, enter the overflow gap 7, which serves as a buffer space for water in the overflow gap 7, increasing the path of water flow. And combined with the blocking of the water - blocking ring 8, most of the water is blocked, and only a small part of the water will continue to enter the installation sleeve 3. This part of the water that enters the installation sleeve 3 will reach the secondary water - blocking mechanism. And because there is a first drainage check valve 4 arranged between the primary water - blocking mechanism and the secondary water - blocking mechanism, the first drainage check valve 4 also plays a role in draining water (when arranging the installation sleeve 3, the first drainage check valve 4 is arranged on the lower side). If there is still water remaining, then a plurality of outer water - blocking rings 10 and inner water - blocking rings 11 that are staggered and spaced apart can continue to block the water, extending the path of water flow. Combined with the arrangement of the second drainage check valve 12 corresponding to the radial position of the inner water - blocking ring 11 in sequence, the water can be drained step by step, making it difficult for the outside water to reach the contact part between the motor housing 1 and the motor shaft 2, ensuring the waterproof effect.
[0023] As Figure 1 shown, a sealing ring 13 is sleeved between the first diversion ring 5 and the motor shaft 2; a support ring 14 is fixedly sleeved outside the sealing ring 13; the support ring 14 is fixed to the first diversion ring 5 by positioning screws 15.
[0024] The setting of the sealing ring 13 can fill the gap between the first diversion ring 5 and the motor shaft 2, playing a role in blocking water at the first step and making the waterproof effect more prominent. Of course, since the continuous rotation of the motor shaft 2 will wear the sealing ring 13, the sealing ring 13 can be selected for installation. For example, it can be installed when the water - encountered environment of the permanent magnet direct drive motor is relatively severe, and attention should be paid to timely replacement to ensure long - term waterproof effect. And when it is only occasionally encountered with water, the sealing ring 13 can be selected not to be installed, and the waterproof performance can be ensured only through the primary water - blocking mechanism and the secondary water - blocking mechanism.
[0025] As Figure 2 shown, one end of the second diversion ring 6 close to the inner side of the first diversion ring 5 is covered and fixed with a water - absorbing pad 16. The water - absorbing pad 16 can absorb the water entering the overflow gap 7, further reducing the water entering the secondary water - blocking mechanism.
[0026] The installation sleeve 3 is made of a light - transmissive material. On the one hand, it is convenient to judge the residual water situation inside the installation sleeve 3 through the light - transmissive material, and on the other hand, it is convenient for light to penetrate, which is beneficial to the evaporation of water (including the water absorbed by the water - absorbing pad 16).
[0027] It is understandable that the present utility model is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.
Claims
1. A permanent magnet direct drive motor waterproof structure, characterized in that: The invention comprises a mounting sleeve (3) arranged outside the motor housing (1); the mounting sleeve (3) is coaxially sleeved outside the motor shaft (2); one end of the mounting sleeve (3) is sealed and fixed to the end of the motor housing (1), and a primary water blocking mechanism is arranged inside the other end; a secondary water blocking mechanism is arranged inside the primary water blocking mechanism; the outer wall of the mounting sleeve (3) is connected to a first water drainage check valve (4); the first water drainage check valve (4) is located between the primary water blocking mechanism and the secondary water blocking mechanism; The primary water blocking mechanism comprises a first guide ring (5) sleeved and fixed on the inner side of the end of the mounting sleeve (3); the first guide ring (5) is coaxially sleeved on the outside of the motor shaft (2); the inner diameter of the first guide ring (5) is larger than the diameter of the motor shaft (2); the inner side of the first guide ring (5) is a conical surface; a second guide ring (6) is coaxially arranged on the inner side of the first guide ring (5); the second guide ring (6) is sleeved and fixed on the motor shaft (2); the outer diameter of the second guide ring (6) is smaller than the outer diameter of the motor shaft (2). The inner diameter of the mounting sleeve (3) is arranged; the end of the second guide ring (6) close to the inner side surface of the first guide ring (5) is in a conical surface structure and is parallel to the inner side surface of the first guide ring (5); an overflow gap (7) is formed between the second guide ring (6) and the first guide ring (5); a water retaining ring (8) is coaxially fixed to the inner end of the first guide ring (5); a positioning ring groove (9) is coaxially formed on the second guide ring (6); the water retaining ring (8) is rotatably connected to the positioning ring groove (9); The secondary water-blocking mechanism comprises a plurality of outer water-blocking rings (10) which are sequentially sleeved and fixed on the inner wall of the mounting sleeve (3), and a plurality of inner water-blocking rings (11) which are sequentially sleeved and fixed on the motor shaft (2); the outer water-blocking rings (10) and the inner water-blocking rings (11) are arranged in a staggered manner; the outer wall of the mounting sleeve (3) is connected to a plurality of second water-discharging check valves (12); the second water-discharging check valves (12) sequentially correspond to the radial positions of the inner water-blocking rings (11).
2. A permanent magnet direct drive motor waterproof structure according to claim 1, characterized in that: A sealing ring (13) is sleeved between the first guide ring (5) and the motor shaft (2); a support ring (14) is sleeved and fixed outside the sealing ring (13); and the support ring (14) is fixed to the first guide ring (5) via a positioning screw (15).
3. The waterproof structure of a permanent magnet direct drive motor according to claim 1, characterized in that: An end of the second guide ring (6) close to the inner side surface of the first guide ring (5) is covered and fixed with a water absorbent pad (16).
4. A permanent magnet direct drive motor waterproof structure according to claim 3, characterized in that: The mounting sleeve (3) is made of a light-transmitting material.