CN218276276U - High-power outer rotor underwater brushless motor - Google Patents

Abstract

The utility model belongs to the technical field of brushless motors, in particular to a high-power external rotor underwater brushless motor, which comprises an outer cover, a front cover, a stator seat, a rotating shaft, a first shaft hole arranged in the stator seat and a second shaft hole arranged in the front end part of the outer cover; the front end part of the rotating shaft is positioned outside the outer cover; a plurality of magnets and a cylindrical casing; the front surface of the outer cover is internally provided with a front sealing cover which can be separately connected with the outer cover, the front sealing cover is provided with an oil seal chamber which is embedded in the front end part of the outer cover, and an oil seal which is sleeved on the rotating shaft is arranged in the oil seal chamber. By adopting the structure, 1, the front sealing cover and the oil seal are directly connected together for abandoning and replacing, and compared with the scrapping of the whole outer cover, the cost is lower; 2. the concentricity of the rotating shaft is increased, and the vibration of the motor during operation is reduced; 3. the sealing ring is arranged, so that the waterproof effect is good, glue sealing is not required, and the follow-up disassembly and maintenance are convenient; 4. the unbalance of the rotor and the subsequent vibration of the motor are reduced; 5. the magnet is ensured to have no risk of flying out and falling off when used for a long time under high power, high torque and medium and high speed.

Description

High-power outer rotor underwater brushless motor

Technical Field

The utility model relates to a brushless motor technical field specifically indicates a high-power external rotor brushless motor for it is underwater.

Background

At present, with the improvement of economic level, underwater sports are more and more popular among people, such as the fields of underwater robots, propellers, electric boats, surfboards, manned hydrofoils and the like. The power motor in the equipment has the advantages of high efficiency, high power, large torque, stepless variable frequency speed regulation, long service life, easy maintenance, medium and high rotating speed, low noise, low resistance area, corrosion resistance, water resistance, sundry entry prevention and the like. At present, the performance of the motor can be realized only by a direct current brushless motor. In order to achieve the characteristics of high power, large torque and high efficiency, the conventional power motor generally adopts a multi-groove and multi-pole outer rotor motor structure. As is well known, due to the structural characteristics of the outer rotor, a certain gap is required between the rotor and the stator assembly to ensure smooth operation without interference. And such design can cause the inside sea water or impurity etc. that gets into of motor under water, causes the inside part damage of motor, can't stably work. This requires a waterproof sealing design for such machines. In order to ensure the high performance characteristic and low resistance area when entering water, the high-power underwater brushless motor on the market mostly adopts a mode of a thin and long outer cover with a small outer diameter and a waterproof oil seal to seal and wrap the motor, and the functions of water prevention, sundries prevention and corrosion resistance are realized while the efficiency and the power of the motor are ensured. This kind of structure is owing to use under water, and the structure connection combination department adopts the screw cooperation to beat to glue sealed the use more, and motor later maintenance is disassembled loaded down with trivial details, and cost of maintenance is higher. And the motor is designed to be slender and low in resistance while being compatible with power, the rotor part of the motor needs to be designed to be longer, and in addition, the position of a propeller installed on an output shaft (a rotating shaft stretches out) of the underwater motor is also longer, so that the concentricity of the motor is increased when the motor runs, the motor rotor swings severely, and larger vibration and noise are caused. And the motor rotor is too long, the magnet inside can be correspondingly longer, and due to the multi-pole design of the outer rotor and the multi-groove, the magnet is difficult to assemble and easy to incline during production and assembly, so that the additional rotor is unbalanced, and further the motor runs and vibrates, and the magnet runs at high power, high torque and medium and high speed in a long-time closed space underwater, and is easy to fall off and fly out from the end face under the action of centrifugal force and high temperature. Due to the material and structural characteristics of the waterproof oil seal, under the condition that the motor runs, particularly under the condition of underwater load, the propeller is frequently accelerated and decelerated, started, stopped and rotated left and right to drive seawater to impact the waterproof oil seal in multiple dimensions, so that the oil seal at the front end of the outer cover is easy to fall off under the action of counter impact force or other physical actions, the waterproof effect is lost, and water drops and sundries enter the motor to be damaged. And the shaft rotates at a high speed to rub the inner ring of the oil seal, so that the oil seal is abraded and damaged or destroyed after long-time operation, and the oil seal is blocked at the oil seal of the outer cover, so that the oil seal is difficult to disassemble and maintain, and the whole outer cover or the motor is scrapped.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a high-power outer rotor underwater brushless motor; the outer cover and the front sealing cover are detachably connected, so that the installation and the replacement are convenient, the snap spring is additionally arranged on the rear end face of the oil seal to limit the oil seal, and the oil seal is prevented from falling off under the multi-dimensional stress and reverse impact.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a high-power outer rotor underwater brushless motor comprises an outer cover, a front cover, a stator seat, a rotating shaft, a first shaft hole and a second shaft hole, wherein the front cover is arranged in the outer cover and is coaxial with the outer cover; the outer cover, the front cover and the stator seat are all sleeved on the rotating shaft; the front end part of the rotating shaft is positioned outside the outer cover, and the rear end part of the rotating shaft is positioned in the rear end part of the first shaft hole; the cylindrical shell is sleeved on the rotating shaft, the front end of the cylindrical shell is connected with the front cover, and the cylindrical shell is formed by enclosing a plurality of magnets; the front surface of the outer cover is internally provided with a front sealing cover which is detachably connected with the outer cover and sleeved on the rotating shaft, the front sealing cover is provided with an oil seal chamber which is embedded in the front end part of the outer cover, and the oil seal chamber is internally provided with an oil seal which is sleeved on the rotating shaft.

Furthermore, a first bearing sleeved on the rotating shaft is arranged in the front end part of the outer cover, two second bearings sleeved on the rotating shaft are arranged in the front end part of the first shaft hole, and a third bearing sleeved on the rear end part of the rotating shaft is arranged in the rear end part of the first shaft hole.

An annular clamp spring sleeved on the rotating shaft is embedded in the inner wall of the oil seal chamber and is located on the outer side of the oil seal and used for limiting the oil seal.

A first sealing ring is arranged in the surface, which is abutted with the inner surface of the front sealing cover, in the front end part of the outer cover; the first sealing ring is sleeved outside the oil seal chamber and is tightly attached to the inner surface of the front sealing cover.

The stator seat is provided with a thread section positioned on the front side of the rear end part of the stator seat, and the thread section is inserted into the opening at the rear end of the outer cover and is in threaded connection with the rear end of the outer cover; and a second sealing ring which is embedded in the outer wall of the threaded section along the radial direction is arranged at the position where the end surface of the rear end part of the stator seat is combined with the threaded section.

A rear sealing cover is arranged in the rear surface of the stator seat, and a rear threaded section which is inserted into the rear end of the first shaft hole and is connected with the stator seat through threads is arranged on the rear sealing cover; and a third sealing ring is sleeved on the rear thread section and used for sealing the connection surface of the rear sealing cover and the stator seat.

Furthermore, a limiting ring in threaded connection with the shell is arranged in the opening at the rear end of the shell, and a magnet ring body respectively attached to the limiting ring and the magnet is arranged between the limiting ring and the rear end face of the magnet.

Further, an outer snap spring is embedded in the outer wall of the rear end of the rotating shaft, and a gasket located between the outer snap spring and the rear surface of the third bearing is sleeved on the rotating shaft.

Compare with current like product, the utility model discloses a brushless motor has following effect: 1. the outer cover and the front sealing cover are detachably connected, the oil seal is arranged in the front sealing cover, the screw can be detached after the oil seal is damaged by friction or external force, and when the oil seal is completely damaged and is difficult to detach, the oil seal is directly connected with the front sealing cover to be abandoned and replaced, so that the cost is lower compared with the scrapping of the whole outer cover; 2. by adopting the bearing design in the mode of 1+2+1, the contact stress surface with the rotating shaft is increased, the stress point is prolonged in multiple sections, the bearing is limited, the concentricity is increased, and the vibration of the motor during operation is reduced; 3. the sealing ring is arranged at the joint of the stator seat and the outer cover and the joint of the front sealing cover and the outer cover, and is extruded and deformed during assembly to be tightly attached to the two joint surfaces, so that the sealing ring has a good waterproof effect, is free from being sealed by gluing and is convenient for subsequent disassembly and maintenance; 4. the tail part of the magnet is additionally provided with the magnet ring, the secondary limiting and the magnet interval correction are carried out, the magnet is ensured not to be inclined after being assembled, and the unbalance of a rotor and the subsequent motor vibration are reduced; 5. a limit ring is added behind the magnet ring and is interlocked with the threads of the shell to extrude the magnet ring, so that the magnet is ensured not to have the risk of flying out and falling off when being used for a long time under the conditions of high power, large torque force, medium and high speed.

Drawings

Fig. 1 is a perspective view of a brushless motor according to an embodiment of the present invention;

fig. 2 is another perspective view of the brushless motor according to the embodiment of the present invention;

fig. 3 is an exploded view of a brushless motor according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a brushless motor according to an embodiment of the present invention;

fig. 5 is a partial exploded view of a brushless motor according to an embodiment of the present invention.

Description of reference numerals: the stator comprises an outer cover-1, a front cover-2, a stator seat-3, a threaded section-301, a rotating shaft-4, a first shaft hole-5, a first bearing-6, a second bearing-7, a third bearing-8, a front sealing cover-9, an oil seal-10, an annular clamp spring-11, a first sealing ring-12, a second sealing ring-13, a rear sealing cover-14, a rear threaded section-1401, a third sealing ring-15, a magnet-16, a machine shell-17, a limiting ring-18, a magnet ring body-19, a stator iron core-20, a waterproof joint-21, a waterproof connecting wire-22, an outer clamp spring-23 and a gasket-24.

Detailed Description

In order to make the technical field of the present invention better understand, the present invention is further described in detail with reference to the accompanying drawings and embodiments.

As shown in fig. 3-5, an embodiment of the present invention provides a high-power external rotor underwater brushless motor, which includes an outer cover 1, a front cover 2 disposed inside the outer cover and coaxial with the outer cover, a stator seat 3 having a front section inserted inside the outer cover and a rear end portion located outside the outer cover, a rotating shaft 4, a first shaft hole 5 disposed inside the stator seat, and a second shaft hole disposed inside the front end portion of the outer cover; the outer cover 1, the front cover 2 and the stator seat 3 are all sleeved on the rotating shaft; the front end part of the rotating shaft is positioned outside the outer cover 1, and the rear end part of the rotating shaft is positioned in the rear end part of the first shaft hole 5; the front end of the cylindrical shell 17 is connected with the front cover, and the cylindrical shell 17 is surrounded by a plurality of magnets 16; meanwhile, the stator core 20 is sleeved on the stator seat 3 and located in the magnet 16, three waterproof joints 21 are arranged on the rear end face of the stator seat 3, and waterproof connecting wires 22 are respectively connected with the three waterproof joints, as shown in fig. 2-3; these parts are all of the same kind of equipment available in the prior art and will not be described in detail here. The outer cover 1 mainly plays a role in water prevention, sundries prevention and water pressure resistance protection.

In order to facilitate the disassembly and assembly of the oil seal and facilitate the timely replacement, a front sealing cover 9 which is detachably connected with the front surface of the outer cover 1 and sleeved on the rotating shaft 4 is arranged in the front surface of the outer cover, an oil seal chamber which is embedded in the front end part of the outer cover is arranged on the front sealing cover, and an oil seal 10 which is sleeved on the rotating shaft 4 is arranged in the oil seal chamber; the front sealing cover 9 is connected with the outer cover 1 through a plurality of screws, so that the front sealing cover 9 is convenient to disassemble and assemble. An annular clamp spring 11 sleeved on the rotating shaft 4 is embedded in the inner wall of the oil seal chamber, and the annular clamp spring is located on the outer side of the oil seal 10 and used for limiting the oil seal. Specifically, the oil seal 10 is a market universal oil seal, is made of materials with the characteristics of wear resistance, high temperature resistance and the like, and mainly plays a role in water resistance and sundry prevention; the annular clamp spring 11 is made of stainless steel, plays a role of limiting an oil seal, and prevents the oil seal 10 from falling off due to external force or other physical changes. Adopt this structure, dustcoat 1 and preceding closing cap 9 separable connection, in the closing cap 9 before oil blanket 10 locates, can dismantle the screw after the oil blanket receives friction or external force to damage, directly gives up the change together with preceding closing cap 9, compares and scrap whole dustcoat 1, and the cost is lower.

As shown in fig. 4, a first sealing ring 12 is arranged in the surface of the front end of the outer cover 1, which is abutted against the inner surface of the front cover 9; the first sealing ring is sleeved outside the oil seal chamber and (the first sealing ring) is tightly attached to the inner surface of the front sealing cover 9.

As shown in fig. 4, a threaded section 301 located at the front side of the rear end of the stator seat is arranged on the stator seat 3, and the threaded section is inserted into the opening at the rear end of the outer cover 1 and is in threaded connection with the rear end of the outer cover; and a second sealing ring 13 which is embedded in the outer wall of the threaded section along the radial direction is arranged at the position where the end surface of the rear end part of the stator seat is combined with the threaded section 301.

As shown in fig. 4, a first bearing 6 sleeved on the rotating shaft 4 is disposed in the front end of the outer cover, two second bearings 7 sleeved on the rotating shaft are disposed in the front end of the first shaft hole 5, and a third bearing 8 sleeved on the rear end of the rotating shaft 4 is disposed in the rear end of the first shaft hole 5. The bearing of the embodiment adopts a mode layout of 1+2+1, the contact stress surface of the bearing and the rotating shaft 4 is enlarged, the stress point is prolonged in multiple sections, the bearing is limited, the concentricity is increased, and the vibration of the motor during operation is reduced.

A rear sealing cover 14 is arranged in the rear surface of the stator seat 3, and a rear threaded section 1401 which is inserted into the rear end of the first shaft hole 5 and is connected with the stator seat through threads is arranged on the rear sealing cover; and a third sealing ring 15 is sleeved on the rear thread section and used for sealing the connecting surface of the rear sealing cover 14 and the stator seat 3.

The sealing ring is made of wear-resistant plastic materials with certain extrusion deformation, and the gap of the connecting piece is sealed after subsequent extrusion deformation, so that the waterproof effect is cut off. The joint of the stator seat 3, the outer cover 1 and the rear sealing cover 14 and the joint of the front sealing cover 9 and the outer cover 1 are provided with the sealing rings, the sealing rings are extruded and deformed during assembly and tightly attached to two joint surfaces, so that the waterproof effect is good, the sealing is not required to be glued and sealed, and the follow-up disassembly and maintenance are convenient.

A limiting ring 18 connected with the shell 17 through threads is arranged in the rear end opening of the shell 17, and a magnet ring body 19 respectively attached to the limiting ring and the magnet 16 is arranged between the limiting ring and the rear end face of the magnet. The magnet ring body 19 is arranged on the rear end face of the magnet 16, the magnet ring is provided with a plurality of magnet teeth corresponding to the width of the magnet, and has limiting and guiding effects with the magnet teeth of the front cover 2, so that the problems that the balance of a motor rotor is poor and the whole machine shakes due to the fact that the magnet is prone to being skewed during the over-long production are avoided; the limiting ring 18 is installed on the rear end face of the magnet ring body 19, the outer circular face of the limiting ring is provided with threads matched with a certain depth, and the threads are used for supporting and rotating the tool to be locked to the inner threads of the shell 17 until the magnet ring body 19 is completely attached and pressed, so that the risk that the magnet 16 falls off and is thrown away due to large centrifugal force when the motor operates at high power, large torque and high rotating speed is avoided.

An outer clamp spring 23 is embedded in the outer wall of the rear end of the rotating shaft 4, a gasket 24 located between the outer clamp spring and the rear surface of the third bearing 8 is sleeved on the rotating shaft 4, and the outer clamp spring is used for limiting the axial direction of the third bearing 8, preventing the third bearing from being separated from the rotating shaft 4 and preventing the rotating shaft 4 from axially moving.

In the above description, it should be noted that the terms "mounted," "connected," and the like are used in a broad sense, and for example, they may be fixedly connected, detachably connected, or integrally connected; the connection can be direct connection or indirect connection through an intermediate medium, and the connection between the two components can be internal; the term "mounted" is to be understood as "mounted on" and "disposed on" and includes fixed mounting, movable mounting and the like.

It is to be understood that the above-described embodiments are merely exemplary of the invention, and are not intended to limit the scope of the invention. The present invention may be embodied in many different forms and, on the contrary, these embodiments are provided so that this disclosure will be thorough and complete. All utilize the equivalent structure that the specification and the attached drawing content of the utility model were done, direct or indirect application is in other relevant technical field, all the same reason is within the utility model discloses the patent protection within scope.

Claims (8)

1. A high-power outer rotor underwater brushless motor comprises an outer cover (1), a front cover (2) which is arranged in the outer cover and is coaxial with the outer cover, a stator seat (3) of which the front section is inserted in the outer cover and the rear end part is positioned outside the outer cover, a rotating shaft (4), a first shaft hole (5) which is arranged in the stator seat and a second shaft hole which is arranged in the front end part of the outer cover; the outer cover, the front cover and the stator seat are all sleeved on the rotating shaft; the front end part of the rotating shaft is positioned outside the outer cover (1), and the rear end part of the rotating shaft is positioned in the rear end part of the first shaft hole (5); the cylindrical shell is sleeved on the rotating shaft, the front end of the cylindrical shell is connected with the front cover, the cylindrical shell is formed by enclosing a plurality of magnets (16), and the cylindrical shell (17) is sleeved outside the magnets; the novel oil seal is characterized in that a front sealing cover (9) which is detachably connected with the outer cover and sleeved on the rotating shaft (4) is arranged in the front surface of the outer cover (1), an oil seal chamber which is embedded in the front end part of the outer cover is arranged on the front sealing cover, and an oil seal (10) which is sleeved on the rotating shaft (4) is arranged in the oil seal chamber.

2. The underwater brushless high-power motor with the outer rotor as claimed in claim 1, wherein a first bearing (6) sleeved on the rotating shaft (4) is arranged in the front end portion of the housing, two second bearings (7) sleeved on the rotating shaft are arranged in the front end portion of the first shaft hole (5), and a third bearing (8) sleeved on the rear end portion of the rotating shaft is arranged in the rear end portion of the first shaft hole (5).

3. The underwater high-power brushless motor with the outer rotor as recited in claim 1, wherein an annular snap spring (11) sleeved on the rotating shaft (4) is embedded in the inner wall of the oil seal chamber, and the annular snap spring is located outside the oil seal (10) and used for limiting the oil seal.

4. A high power underwater brushless motor with an outer rotor as claimed in claim 1, characterized in that a first sealing ring (12) is arranged in the surface of the front end of the housing (1) abutting against the inner surface of the front cover (9); the first sealing ring is sleeved outside the oil seal chamber and is tightly attached to the inner surface of the front sealing cover (9).

5. The high-power underwater brushless motor with the outer rotor as recited in claim 1, characterized in that the stator base (3) is provided with a threaded section (301) located at the front side of the rear end of the stator base, the threaded section is inserted into the opening at the rear end of the outer cover (1) and is in threaded connection with the rear end of the outer cover; and a second sealing ring (13) which is embedded in the outer wall of the threaded section along the radial direction is arranged at the position where the end surface of the rear end part of the stator seat is combined with the threaded section (301).

6. The high-power underwater brushless motor with the outer rotor as recited in claim 5, characterized in that a rear sealing cover (14) is arranged in the rear surface of the stator seat (3), and the rear sealing cover is provided with a rear threaded section (1401) which is inserted into the rear end of the first shaft hole (5) and is connected with the stator seat through threads; and a third sealing ring (15) is sleeved on the rear thread section and used for sealing the connecting surface of the rear sealing cover (14) and the stator seat (3).

7. The high-power underwater brushless motor with the outer rotor as recited in claim 1, characterized in that a limit ring (18) is disposed in the opening of the rear end of the housing (17) and is connected with the housing through a thread, and a magnet ring body (19) is disposed between the limit ring and the rear end face of the magnet (16) and is respectively attached to the limit ring and the magnet ring.

8. The underwater brushless high-power motor with the outer rotor as claimed in claim 1 is characterized in that an outer snap spring (23) is embedded in the outer wall of the rear end of the rotating shaft (4), and a gasket (24) positioned between the outer snap spring and the rear surface of the third bearing (8) is sleeved on the rotating shaft (4).

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