External rotor motor capable of running under water

Abstract

The utility model discloses an external rotor motor capable of running under water, which comprises a base and an upper cover connected to the base, the upper cover and the base define a functional cavity used for mounting a stator assembly, a rotating shaft used for connecting the stator assembly is arranged in the functional cavity, the upper cover is provided with a rotating shaft hole for the rotating shaft to extend out, and the rotating shaft hole is communicated with the functional cavity. A sealing structure used for sealing a gap between the upper cover and the rotating shaft is arranged between the upper cover and the rotating shaft, the functional cavity is filled with an insulating oil medium, and the outer rotor motor capable of running in a submerged manner aims at overcoming the defects in the prior art and is high in waterproof performance and better in working stability.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of outer rotor motor capable of submerging diving operation. BACKGROUND

[0002] The existing outer rotor motor, including outer rotor, end cover, stator and rotating shaft, the outer rotor is sleeved outside the stator, waterproof structure is arranged between the outer rotor and the end cover, and the specific structure and principle can refer to the patent scheme of the patent number CN202120484744.0 with the waterproof structure of the outer rotor motor applied by the inventor previously. With the growth of underwater equipment and underwater operation demand, the application of motor suitable for running in submerged environment becomes increasingly widespread, and the traditional motor design usually cannot meet the requirements of long-time stable work under the condition of being completely immersed in water, especially in deeper water, because of the large water pressure, which often leads to the reduction of motor waterproof performance or even failure.

[0003] The utility model is just based on the above-mentioned deficiency. INVENTION CONTENTS

[0004] The utility model aims at overcoming the deficiency of prior art, and provides an outer rotor motor capable of submerging diving operation with strong waterproof performance and better working stability.

[0005] The utility model is realized through the following technical schemes:

[0006] The utility model provides an outer rotor motor capable of submerging diving operation, including base, upper cover connected on base, and the upper cover and base enclose a functional cavity for installing stator assembly, the functional cavity is provided with rotating shaft for connecting stator assembly, the upper cover is equipped with rotating shaft hole for rotating shaft to extend, the sealing structure for closing the gap between the upper cover and rotating shaft is equipped, and the functional cavity is filled with insulating oil medium.

[0007] The outer rotor motor capable of submerging diving operation as described above, the sealing structure includes framework oil seal, the outer side of the framework oil seal is abutted on the shaft hole of the upper cover, and the shaft hole of the upper cover is positioned, and the main lip and auxiliary lip of the inner side of the framework oil seal extend towards the rotating shaft and are abutted on the rotating shaft cylindrical surface, and the main lip and auxiliary lip are abutted on the rotating shaft to form dynamic seal.

[0008] The outer rotor motor capable of submerging diving operation as described above, the sealing structure further includes sealing baffle located above the framework oil seal, the sealing baffle is covered on the shaft hole and covers the shaft hole, and the sealing baffle is provided with shielding plate for surrounding the rotating shaft in the middle.

[0009] The outer rotor motor capable of submerging and diving operation as described above, the sealing structure further comprises a dust cover above the sealing baffle, the dust cover is sleeved on the reserved slot of the rotating shaft, and the dust cover is provided with a shielding ring extending outward.

[0010] The outer rotor motor capable of submerging and diving operation as described above, the middle part of the sealing baffle is provided with a lower recess embedded into the rotating shaft hole, the shielding baffle is arranged on the side of the lower recess close to the rotating shaft, the shielding baffle is provided with a baffle reserved slot, and the shielding ring is provided with a sand shielding ring extending towards the rotating shaft on the side close to the rotating shaft, and the sand shielding ring extends into the baffle reserved slot.

[0011] The outer rotor motor capable of submerging and diving operation as described above, the rotating shaft hole wall and the rotating shaft are provided with a first bearing, the first bearing is located below the skeleton oil seal, and the first bearing is an open bearing.

[0012] The outer rotor motor capable of submerging and diving operation as described above, the skeleton oil seal can be positioned and installed below the sealing baffle or positioned and installed above the first bearing.

[0013] The outer rotor motor capable of submerging and diving operation as described above, the base is provided with a sealing joint in communication with the functional cavity and used for filling insulating oil liquid medium.

[0014] The outer rotor motor capable of submerging and diving operation as described above, the rotating shaft lower part and the base are provided with a second bearing, the second bearing is an open bearing, and the sealing joint is arranged below the second bearing.

[0015] The outer rotor motor capable of submerging and diving operation as described above, the base and the upper cover are provided with an annular sealing ring.

[0016] Compared with the prior art, the outer rotor motor has the following advantages:

[0017] 1. Pressure balance: the insulating oil liquid medium filled in the functional cavity utilizes the incompressibility of liquid to offset external water pressure, so as to protect the internal structure of the motor from high pressure damage, and help to maintain the balance of internal and external pressure, and ensure the safe and reliable and stable operation of the motor;

[0018] 2. Lubrication and wear reduction: the special oil filled internally not only serves as an insulating medium, but also provides necessary lubrication, reduces friction between the stator assembly and bearings and other key components, prolongs the service life of these components, and reduces maintenance frequency and cost;

[0019] 3. High heat dissipation: The oil medium accelerates the transfer of heat from the motor winding, achieving rapid and uniform heat dissipation. This efficient heat management can improve the working efficiency of the motor, allowing higher power density, while also helping to prevent overheating and performance degradation;

[0020] 4. Excellent waterproof performance: By setting a sealing structure at the gap between the upper cover and the rotating shaft, including a skeleton oil seal, a sealing baffle and a dust cover, the waterproof performance of the motor is ensured. This allows the motor to work stably in a water environment for a long time, without being affected by external moisture, greatly expanding its application range;

[0021] 5. Optimized sealing design: The design of the skeleton oil seal uses an annular skeleton to support the main and secondary lips, increasing the effectiveness and durability of the seal; the sealing baffle and the shielding baffle further improve the waterproof performance; and the dust cover effectively prevents the intrusion of external mud and dust, improving the overall comprehensive protection capability of the sealing system. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the outer rotor motor of the utility model;

[0023] Figure 2 is a sectional view schematic diagram of the outer rotor motor of the utility model;

[0024] Figure 3 is Figure 2 a local enlarged view of A of

[0025] Figure 4 is a local partial exploded schematic diagram of the outer rotor motor of the utility model Figure 1 ;

[0026] Figure 5 is a local partial exploded schematic diagram of the outer rotor motor of the utility model Figure 2 ;

[0027] Figure 6 is a structural schematic diagram of the skeleton oil seal of the utility model. DETAILED DESCRIPTION

[0028] The utility model will be further described below in conjunction with the drawings:

[0029] The directions described in the utility model specification, such as "up", "down", "left", "right", "front", "back", etc. are based on the direction of the drawings, and are for the purpose of describing the relationship between the various components, and are not the only or absolute position relationship between the various components, but only one of the embodiments of the utility model, and is not a limitation on the embodiments.

[0030] The utility model introduces a design for submerging operation under the water environment outer rotor motor, like Figures 1 to 5 As shown. The motor is mainly composed of base 1 and the upper cover 2 connected on it, and the both jointly enclose a closed function cavity 10 for installing stator assembly 3. The function cavity 10 is provided with rotating shaft 4, it is connected with stator assembly and extends through rotating shaft hole 20 on the upper cover 2. To ensure waterproof performance, sealing structure 5 is arranged at the gap between the upper cover 2 and rotating shaft 4 to prevent moisture from entering. The function cavity 10 is filled with insulating oil liquid medium, and the medium is usually selected from special oil with high dielectric strength and excellent lubricating properties, such as silicone oil, mineral insulating oil or ester oil and the like, or mixture of these oils or other oils. The selected oil liquid must be able to withstand the high temperature generated during motor operation and maintain chemical stability for a long time, not easy to oxidize or decompose. By filling the insulating oil liquid medium, the incompressible characteristics of the liquid can offset part of the external water pressure, protect the internal structure of the motor, balance the internal and external pressure, and ensure that the motor can operate stably for a long time in underwater environment. In addition, the oil liquid medium also provides necessary lubrication effect, reduces the friction between the stator assembly and the bearing and other key components. More importantly, the oil liquid medium accelerates the heat transfer of the motor winding, realizes rapid and uniform heat dissipation effect, and helps to improve the power density of the motor.

[0031] As a preferred design of sealing structure 5, as shown in Figure 3 And Figure 4 The sealing structure includes skeleton oil seal 51, sealing baffle 52 and dust cover 53, or any combination thereof.

[0032] Among them, as a preferred structure of skeleton oil seal 51, as shown in Figure 3 And Figure 4 The outer side of skeleton oil seal 51 abuts against the hole wall of rotating shaft hole 20, and the inner side of skeleton oil seal 51 is provided with main lip 511 and auxiliary lip 512 extending towards rotating shaft 4 and abutting against the cylindrical surface of rotating shaft 4, the thickness of main lip 511 gradually decreases from the direction away from rotating shaft 4 to the direction close to rotating shaft 4 and the small end faces rotating shaft 4, the auxiliary lip 512 is located above the main lip 511, and the auxiliary lip 512 gradually inclines upward from the direction away from rotating shaft 4 to the direction close to rotating shaft 4. As a preferred, as shown in Figure 6As shown, the skeleton oil seal 51 is provided with an annular mounting groove cavity 510, which is arranged between the shaft hole 20 hole wall and the main lip 511. The mounting groove cavity 510 is provided with an annular skeleton 513 for pressing the main lip 511 and the auxiliary lip 512 towards the shaft 4. Specifically, the mounting groove cavity 510 is provided with the annular skeleton 513 on the side wall close to the main lip 511. The annular skeleton 513 is made of metal material with high mechanical strength. When the skeleton oil seal 51 is sleeved on the shaft 4, the annular skeleton 513 supports the main lip 511 and the auxiliary lip 512 and presses them towards the cylindrical surface of the shaft 4, so that the main lip 511 and the auxiliary lip 512 are in abutment with the shaft 4 to form a dynamic sealing connection. The skeleton oil seal 51 can be positioned and installed below the sealing baffle 52 or above the first bearing 6.

[0033] As shown in Figure 3 and Figure 4 , the sealing baffle 52 is located above the skeleton oil seal 51. The sealing baffle 52 covers the shaft hole 20 and seals the shaft hole 20. The sealing baffle 52 is provided with a shielding plate 521 for abutting around the shaft 4. The main body of the sealing baffle 52 covers the shaft hole 20 from top to bottom, preventing external moisture from entering. The shielding plate 521 is pressed against the cylindrical surface of the shaft 4 to improve the waterproof performance.

[0034] As shown in Figure 3 and Figure 4 , the dust cover 53 is located above the sealing baffle 52. The dust cover 53 is sleeved on the shaft 4. In order to facilitate installation, the shaft 4 is provided with a shaft reserved groove 41. The dust cover 53 is sleeved on the shaft reserved groove 41. The dust cover 53 is provided with an outwardly extending shielding ring 531. The shielding ring 531 is used to prevent mud and dust outside the motor from entering the vicinity of the shaft hole 20, further improving the sealing performance.

[0035] As a further preferred embodiment, as shown in Figure 3 and Figure 4As shown, the middle of the sealing baffle 52 is provided with a lower recess 522 embedded in the shaft hole 20, the shielding plate 521 is arranged on one side of the lower recess 522 close to the shaft 4, the shielding plate 521 is gradually inclined upward from the direction away from the shaft 4 to the direction close to the shaft 4, the shielding ring 531 is gradually inclined downward from the direction close to the shaft 4 to the direction away from the shaft 4, so that the shielding ring 531 is inclined downward and substantially parallel to the shielding plate 521, and the shielding ring 531 extends into the recess cavity of the lower recess 522, so that the water flow velocity is very low near the position where the shielding plate 521 contacts the shaft, the water pressure is stable, the particles outside the motor are prevented from entering the gap between the shaft 4 and the shaft hole 20, and the waterproof performance of the structure is greatly improved. As a further optimization, the shielding plate 521 is arranged on one side of the lower recess 522 close to the shaft 4, the shielding plate 521 is provided with a baffle reserved slot 523, the shielding ring 531 is provided with a sand blocking ring 532 extending towards the shaft 4 on the side close to the shaft 4, and the sand blocking ring 532 extends into the baffle reserved slot 523, so that the sealing structure is more compact and the waterproof performance is higher.

[0036] During the installation of the product, before the installation of the skeleton oil seal 51, the sealing baffle 52 and the dust cover 53, as shown in Figure 3 In this state, first, the insulating oil medium is injected from the shaft hole 20 into the functional cavity 10, which can be directly filled or vacuum filled with a sealing medium, so that the medium can completely fill the internal gap of the motor, and then the skeleton oil seal 51, the sealing baffle 52 and the dust cover 53 are installed in sequence. As an optimization, in order to facilitate the subsequent maintenance and use, the insulating oil medium is injected into the functional cavity 10 again, as shown in Figure 5 As an optimization, in order to prevent water from entering the sealing joint 7 under normal use of the motor, a one-way valve structure can be arranged on the sealing joint 7, or a rubber plug can be used to plug the sealing joint 7.

[0037] As an optimization, as shown in Figure 3 and Figure 4 The first bearing 6 is arranged below the skeleton oil seal 51, and the first bearing 6 is an open bearing, which means that the side of the bearing is not provided with a protective cover or a sealing device. The open bearing allows the insulating oil medium to enter the bearing and flow in the upward and downward directions of the bearing, so that the insulating oil medium can lubricate the bearing, and the arrangement structure of the bearing is more compact.

[0038] As an optimization, as shown in Figure 5As shown, the lower part of the rotating shaft 4 is provided with a second bearing 8 between the base 1, the second bearing 8 is an open bearing, and the sealing joint 7 is arranged below the second bearing 8, so that the insulating oil medium can enter the second bearing 8 to realize lubrication, and at the same time the insulating oil medium can also pass through the sealing joint 7 into the motor to make the arrangement structure of the bearing more compact.

[0039] As preferred, as shown in the drawings, Figure 3 and Figure 4 As shown, the base 1 is provided with an annular sealing ring 9 between the upper cover 2, further improving the waterproof performance of the product.

[0040] The above is only an embodiment of the present application, and the specific structure and characteristics of the scheme known in the art are not described in detail. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. An external rotor motor capable of submersion operation, comprising a base (1) and an upper cover (2) connected to the base (1), the upper cover (2) and the base (1) forming a functional cavity (10) for mounting a stator assembly (3), wherein a rotating shaft (4) for connecting the stator assembly (3) is provided in the functional cavity (10), characterized in that: The upper cover (2) is provided with a rotating shaft hole (20) for the rotating shaft (4) to extend out, a sealing structure (5) is arranged between the upper cover (2) and the rotating shaft (4) to seal the gap therebetween, and the functional cavity (10) is filled with insulating oil medium.

2. A water-tolerant submersible operating outer rotor electric machine according to claim 1, characterized in that: The sealing structure (5) comprises a skeleton oil seal (51), the outer side of the skeleton oil seal (51) abuts against the shaft hole (20) of the upper cover (2), the shaft hole (20) of the upper cover (2) is positioned, and the main lip (511) and the auxiliary lip (512) on the inner side of the skeleton oil seal (51) extend towards the rotating shaft (4) and abut against the cylindrical surface of the rotating shaft (4), the main lip (511) and the auxiliary lip (512) abut against the rotating shaft (4) to form dynamic sealing.

3. A water-tight submersible operating outer rotor electric machine according to any of claims 1 or 2, characterized in that: The sealing structure (5) further comprises a sealing baffle (52) arranged above the skeleton oil seal (51), the sealing baffle (52) is arranged on the shaft hole (20) to cover and seal the shaft hole (20), and the sealing baffle (52) is provided with a baffle (521) for shielding around the rotating shaft (4) in the middle part.

4. A water-tolerant submersible operating outer rotor electric machine according to claim 3, characterized in that: The sealing structure (5) further comprises a dust cover (53) arranged above the sealing baffle (52), the dust cover (53) is arranged on the rotating shaft reserved groove (41) of the rotating shaft (4), and the dust cover (53) is provided with a shielding ring (531) extending outward.

5. A water-tolerant submersible operating outer rotor electric machine according to claim 4, characterized in that: The middle part of the sealing baffle (52) is provided with a lower recess (522) recessed into the rotating shaft hole (20), the baffle (521) is arranged on the side of the lower recess (522) close to the rotating shaft (4), the baffle (521) is provided with a baffle reserved groove (523), and the shielding ring (531) is provided with a sand blocking ring (532) extending towards the rotating shaft (4) on the side close to the rotating shaft (4), and the sand blocking ring (532) extends into the baffle reserved groove (523).

6. A water-tolerant submersible operating outer rotor electric machine according to claim 2, characterized in that: The first bearing (6) is arranged below the skeleton oil seal (51), and the first bearing (6) is an open bearing.

7. A water-tolerant submersible operating outer rotor electric machine according to claim 2, characterized in that: The skeleton oil seal (51) can be positioned and installed below the sealing baffle (52) or above the first bearing (6).

8. A water-tolerant submersible operating outer rotor electric machine according to claim 1, characterized in that: The base (1) is provided with a sealing joint (7) in communication with the functional cavity (10) and used for filling insulating oil medium.

9. A water-tolerant submersible operating outer rotor electric machine according to claim 8, characterized in that: The second bearing (8) is arranged between the lower part of the rotating shaft (4) and the base (1), the second bearing (8) is an open bearing, and the sealing joint (7) is arranged below the second bearing (8).

10. A water-tolerant submersible operating outer rotor electric machine according to claim 1, characterized in that: The annular sealing ring (9) is arranged between the base (1) and the upper cover (2).

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