CN111478490A

CN111478490A - Underwater motor with inner rotor

Info

Publication number: CN111478490A
Application number: CN202010353679.8A
Authority: CN
Inventors: 熊明磊; 陈龙冬; 李树强
Original assignee: Boya Gongdao Beijing Robot Technology Co Ltd
Current assignee: Boya Gongdao Beijing Robot Technology Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-07-31

Abstract

The invention provides an inner rotor underwater motor, relates to the technical field of underwater motors, and mainly aims to solve the technical problem that an open type motor in the prior art is poor in adaptability. This inner rotor is motor under water, including stator module, rotor subassembly and closing cap, stator module is located the rotor subassembly outside, including winding, fastening bolt, shell and inner shell, the shell with the both ends of inner shell are passed through respectively fastening bolt with the closing cap forms a sealed cavity, the winding is located this sealed cavity, and shell and inner shell are located the inside and outside both sides of winding respectively and laminate each other with the winding this moment. The stator assembly of the underwater motor is reasonably designed to realize that the winding part is sealed in the chamber, so that the isolation between the stator assembly and the working medium liquid of the motor is realized, the rigidity of the stator of the motor can be obviously enhanced, and the underwater motor has better pressure resistance.

Description

Underwater motor with inner rotor

Technical Field

The invention relates to the technical field of underwater motors, in particular to an open type inner rotor underwater motor.

Background

The power system of underwater equipment is mainly realized by a motor at present, and because the motor is used underwater, the motor needs to be sealed in order to ensure that the motor can normally work in a complex underwater environment. When the water depth is larger, the measures of magnetic coupling and oil-filled sealing are often needed for treatment. The magnetic coupling converts dynamic sealing into static sealing, so that the motor can realize the working condition of the whole sea depth, but the magnetic coupling has the problems of large weight and low magnetic loss power; the oil-filled seal can greatly increase the water pressure which can be borne by the motor, and particularly can meet the working condition of full sea depth when a pressure-supplementing and oil-supplementing device is added, but the weight and the structural complexity of the motor are also greatly increased by the pressure-supplementing and oil-supplementing device added by the oil-filled seal, so that the effective load of equipment utilizing the device is greatly reduced.

Besides the mode, the problems of overlarge weight and complex structure of the motor can be solved by designing the motor in an open type, but the requirement of the open type motor on a water body is high, and once impurities exist in water, the motor can not work normally.

Therefore, in order to solve the above problems, it is necessary to develop an open-type motor having higher adaptability to the water environment and more reliability.

Disclosure of Invention

The invention aims to provide an inner rotor underwater motor, which aims to solve the technical problem that an open motor in the prior art is poor in adaptability. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides an inner rotor underwater motor which comprises a stator assembly, a rotor assembly and a sealing cover, wherein the stator assembly is positioned on the outer side of the rotor assembly and comprises a winding, a fastening bolt, an outer shell and an inner shell, two ends of the outer shell and the inner shell form a sealed cavity through the fastening bolt and the sealing cover respectively, and the winding is positioned in the sealed cavity.

The winding part is sealed in the cavity by reasonably designing the stator assembly of the underwater motor, so that the isolation between the stator assembly and the motor and the working medium liquid is realized, and the motor is simple in structure and reliable in work.

In the above technical solution, preferably, the outer shell and the inner shell are closely attached to the winding.

At the moment, the inner shell and the outer shell are tightly attached to the winding part, the strength of the stator part of the motor is further increased, the motor has better pressure resistance, the weight of the motor is greatly reduced while the rigidity of the motor is maintained, and the effective load of the motor equipment is increased.

In the above technical scheme, it is preferred, the rotor subassembly includes motor shaft, magnet steel, permanent magnet and adapter sleeve, the motor shaft is worn to establish the stator module middle part, the magnet steel be located the motor shaft outside and with motor shaft fixed connection, the permanent magnet is fixed through the mode of pasting the magnet steel outside, the adapter sleeve is cylindrical structure and cover and establishes the permanent magnet outside.

In the above technical scheme, preferably, the motor shaft is fixed with the magnetic steel in a key connection and/or paste connection manner.

The structural reliability of the rotor part of the motor can be realized through the mode.

In the above technical solution, preferably, the sealing cover includes an inner casing ring, a first bolt and a second bolt, wherein the inner casing ring is fixedly connected to the outer casing and the inner casing through the first bolt and the second bolt, respectively.

An inner casing ring is fixedly connected to the inner casing and the outer casing to form a sealed chamber for the seal winding.

In the above technical solution, preferably, the stator assembly further includes a first O-ring and a second O-ring, wherein the first O-ring is located on a peripheral side of the fastening bolt and is used for sealing a gap between the inner casing and the outer casing; the second O-ring is located between the outer shell and the inner shell ring.

In the above technical solution, preferably, the cover further includes a snap spring, an oil injection bolt, and a third O-ring, the third O-ring is located between the inner shell and the inner shell ring, and the snap spring and the oil injection bolt are fixedly disposed outside the inner shell ring.

The inner shell is provided with an oil filling hole, and the oil filling hole is communicated with the outside and the sealed cavity, so that oil filling treatment can be performed on the inside of the sealed cavity through the oil filling hole. After the oiling is completed, an oiling bolt is installed, and a sealing ring is arranged on the oiling bolt to seal the sealing cavity.

In the above technical scheme, preferably, the rear end of the inner shell is provided with a potting structure, the motor wire is routed through a wire outlet on the potting structure, and then the wire outlet is subjected to potting treatment by using epoxy resin glue. The motor line is externally connected with a control panel for supplying power so as to enable the motor rotor to rotate.

In the above technical solution, preferably, the rotor assembly further includes at least one bearing, and the bearing is fixedly disposed between the motor shaft and the stator assembly; when the number of the bearings is two, the two bearings are respectively positioned at the left side and the right side of the magnetic steel.

The motor shaft is connected with the outer shell and the inner shell through two bearings respectively.

In the above technical solution, preferably, the rotor assembly further includes an inner baffle ring located between the motor shaft and the housing, and the inner baffle ring is tightly attached to the bearing and disposed on one side away from the magnetic steel.

In the above technical solution, preferably, a motor control board is further fixed in the sealed chamber.

Compared with the prior art, the invention provides an inner rotor underwater motor which comprises a stator assembly, a rotor assembly and a sealing cover, wherein the winding part in the stator assembly is sealed under the action of an inner shell, an outer shell and the sealing cover, and meanwhile, the winding part, the outer shell and the inner shell are tightly attached together to enhance the rigidity of the stator part of the motor and reduce the weight of the motor, thereby increasing the effective load of the motor equipment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure of an inner rotor underwater motor of the present invention;

FIG. 2 is a schematic cross-sectional view of FIG. 1;

fig. 3 is a front view of fig. 1.

In the figure: 1. a stator assembly; 11. winding; 12. fastening a bolt; 13. a housing; 14. an inner shell; 15. a first O-ring; 16. a second O-ring; 2. a rotor assembly; 21. a motor shaft; 22. magnetic steel; 23. a permanent magnet; 24. fastening sleeves; 25. a bearing; 26. an inner baffle ring; 3. sealing the cover; 31. an inner shell ring; 32. a first bolt; 33. a second bolt; 34. a clamp spring; 35. oiling bolts; 36. a third O-ring; 37. encapsulating the structure; 4. sealing the chamber; 5. a motor control panel.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate orientations or positional relationships based on those shown in fig. 1, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present invention.

FIG. 1 is a schematic view of the overall structure of an inner rotor underwater motor of the present invention; as can be seen from the figure, the motor is integrally in a columnar structure, a motor shaft extends out of one end of the motor, a sealing cover is arranged at the other end of the motor shaft, two oil injection bolts used for performing oil injection treatment in the sealing cavity are respectively arranged at two ends of the sealing cover, and an encapsulating structure is further arranged on the sealing cover.

FIG. 2 is a schematic cross-sectional view of FIG. 1; at this moment, it can be clearly seen that the device comprises a stator assembly, a rotor assembly and a cover, wherein the stator assembly mainly comprises an outer shell, a winding and an inner shell, wherein a fastening bolt and a first O-ring are used for fixing and sealing the outer shell and the inner shell which are positioned at the front end of the motor, and the rear ends of the outer shell and the inner shell are required to be sealed through the cover; the inner shell ring in the closing cap can help to close the outer shell and the inner shell, wherein the second O ring is used for closing a gap between the outer shell and the inner shell ring, the third O ring is used for closing a gap between the inner shell and the inner shell ring, the first bolt is used for fixing the inner shell ring on the outer shell, the second bolt is used for fixedly connecting the inner shell ring and the inner shell, and the clamp spring can help to fix the inner shell ring and the outer shell.

FIG. 3 is a front view of FIG. 1; the position relation of the oiling bolts and the encapsulation structure can be clearly seen from the figure, wherein the two oiling bolts are oppositely arranged and have the same distance with the axis of the motor, and the encapsulation structure is positioned at the side part of the cover.

As shown in fig. 1-3, the present invention provides an inner rotor underwater motor, which mainly comprises three parts, namely a stator assembly 1, a rotor assembly 2 and a cover 3, wherein the stator assembly 1 is located at the outer peripheral side of the rotor assembly 2 and mainly comprises three parts, namely a winding 11, an outer shell 13 and an inner shell 14, the rotor assembly 2 is located inside the stator assembly 1, and only a motor shaft 21 extends out relative to the front end of the stator assembly 1 along the axial direction relative to the stator assembly 1, as shown in fig. 1, the cover 3 is fixedly arranged at the other end of the stator assembly 1.

In particular, the outer and

inner shells

13, 14 of the stator assembly 1 cooperate with the cover 3 to form a sealed chamber 4, and the windings 11 are located inside the sealed chamber 4. That is, the winding 11 is located in an annular cylindrical sealing structure, and the outer casing 13 and the inner casing 14 are respectively located at the inner side and the outer side of the winding 11, so that the winding 11 is isolated from the rotor assembly 2 of the motor and the working medium liquid. This motor structure compares simplyr and has higher reliability this moment with traditional closed motor.

In order to further increase the stiffness of the motor and to enable it to better adapt to deep water environments, the outer shell 13 and the inner shell 14 are, as an alternative, tightly fitted to the winding 11. The windings 11 can now increase the stiffness of the inner shell 14 and the outer shell 13.

Specifically, the thickness of the inner shell 14 and the outer shell 13 is 1mm to 10mm, and in the scheme, the thickness is 2 mm.

Because the outer shell 13 of the inner shell 14 is closely attached to the winding 11, the strength of the stator part of the motor is further increased, the motor has better pressure resistance, the weight of the motor is greatly reduced while the rigidity of the motor is maintained, and the effective load of the motor equipment is increased.

The inner rotor underwater motor comprises a stator component 1 and a rotor component 2, wherein the rotor component 2 is in direct contact with a working medium and is of an open structure as a whole.

Specifically, a working air gap of 2.5 mm-6 mm exists between the rotor assembly 2 and the stator assembly 1.

As an optional implementation manner, the rotor assembly 2 is provided to include the motor shaft 21, the magnetic steel 22, the permanent magnet 23, and the fastening sleeve 24, wherein the magnetic steel 22, the permanent magnet 23, and the fastening sleeve 24 are all sequentially distributed outside the motor shaft 21 along an annular array, and the fastening sleeve 24 is an annular columnar structure and tightly sleeved outside the permanent magnet 23, so as to prevent the permanent magnet 23 from being damaged during the working process.

As an alternative embodiment, the motor shaft 21 is inserted through the middle of the stator assembly 1 and fixedly connected to the stator assembly 1 and the cover 3 through the bearing 25, and the motor shaft 21 is located on the axis of the stator assembly 1.

When the number of the bearings 25 is two, the two bearings 25 are respectively located on the left and right sides of the magnetic steel 22.

As an alternative embodiment, the rotor assembly 2 further includes an inner baffle ring 26 located between the motor shaft 21 and the housing 13, and the inner baffle ring 26 is closely attached to the bearing 25 and disposed at a side away from the magnetic steel 22.

Specifically, the magnetic steel 22 is located outside the motor shaft 21 and fixed on the motor shaft 21 by means of anaerobic adhesive.

Specifically, the magnetic steel 22 may be fixed to the outer peripheral side of the motor shaft 21 by a key connection.

Specifically, the magnetic steel 22 can be fixedly connected with the motor shaft 21 by means of bonding and key connection.

The outer side of the magnetic steel 22 is fixedly provided with a permanent magnet 23 in a bonding mode. At this time, anaerobic adhesive is also selected for bonding treatment.

The fastening sleeve 24 is sleeved outside the permanent magnet 23, and in order to better fix the magnetic steel 22 and the permanent magnet 23, the fastening sleeve 24 and the permanent magnet 23 are in interference fit. The outer peripheral side of the fastening sleeve 24 may be reinforced. It should be noted that the fastening sleeve 24 can completely enclose the permanent magnet 23. The clamping sleeve 24 is made of a corrosion-resistant stainless steel or alloy material. The fastening sleeve 24 arranged outside the permanent magnet 23 can not only reinforce the permanent magnet 23, but also prevent the permanent magnet 23 from rusting.

The structural reliability of the rotor part of the motor can be effectively improved through the mode.

As can be seen from the above description, the rear side of the inner rotor underwater motor needs to be sealed by the cover 3 to ensure that the winding 11 and the rotor are isolated from each other. Specifically, the cover 3 includes an inner shell ring 31, a first bolt 32 and a second bolt 33, wherein the inner shell ring 31 is fixedly connected to the outer shell 13 and the inner shell 14 by the first bolt 32 and the second bolt 33, respectively.

Under the action of the first bolts 32 and the second bolts 33, the inner shell ring 31 is fixedly connected with the inner shell 14 and the outer shell 13 so as to realize sealing on the rear side of the stator assembly 1.

In order to ensure the sealing effect of the sealing chamber 4, since there may be a gap between the inner casing 14 and the outer casing 13, as an alternative embodiment, the stator assembly 1 further includes a first O-ring 15 and a second O-ring 16, wherein the first O-ring 15 is located on the circumferential side of the fastening bolt 12 and is used for sealing the gap that may exist between the inner casing 14 and the outer casing 13; the second O-ring 16 is located between the outer shell 13 and the inner shell ring 31; closure 3 further comprises a third O-ring 36 structure, which third O-ring 36 is located between inner shell 14 and inner shell ring 31 and serves to close any gaps that may exist there.

As an optional embodiment, the cover 3 further includes a snap spring 34 and an oil injection bolt 35, and the snap spring 34 and the oil injection bolt 35 are fixedly disposed on the inner shell ring 31, wherein the snap spring 34 can ensure the sealing effect between the inner shell ring 31 and the outer shell 13. In addition, the inner shell is provided with an oil filling hole, the oil filling hole is communicated with the outside and the sealed chamber 4, and oil filling treatment can be carried out in the sealed chamber 4 through the oil filling hole. After the oiling is completed, the oiling bolt 35 is installed, and the oiling bolt 35 is provided with a sealing ring to seal the sealing chamber 4.

In an alternative embodiment, potting structure 37 is provided at the rear end of inner housing 14, as shown in FIG. 3. The motor wires are routed through the outlet on the potting structure 37, and then the outlet is potted with epoxy glue. The motor line is externally connected with a control panel for supplying power so as to enable the motor rotor to rotate.

As an alternative embodiment, the control panel may also be designed within the sealed chamber 4.

Specifically, a motor control board 5 is fixed in the sealed chamber 4.

The winding 11 structure in the inner rotor motor works inside the sealed chamber 4. The motor is simple and reliable in overall structure, and meanwhile, the rotor assembly 2 and the stator assembly 1 have high rigidity. The experimental result shows that when the thicknesses of the inner shell 14 and the outer shell 13 are both 2mm, the inner rotor motor can still normally work under 3000m of water, which indicates that the structure has better pressure resistance. The scheme overcomes the defects of thick wall thickness and high cost of the fully-closed motor under the condition of large water depth, reduces the weight of the motor and increases the effective load of equipment using the motor.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. The underwater motor with the inner rotor is characterized by comprising a stator assembly (1), a rotor assembly (2) and a sealing cover (3), wherein the stator assembly (1) is located on the outer side of the rotor assembly (2) and comprises a winding (11), a fastening bolt (12), an outer shell (13) and an inner shell (14), two ends of the outer shell (13) and the inner shell (14) are respectively connected with the fastening bolt (12) and the sealing cover (3) to form a sealing cavity (4), and the winding (11) is located in the sealing cavity (4).

2. An internal rotor underwater motor according to claim 1, characterized in that said outer shell (13) and said inner shell (14) are tightly fitted with said winding (11).

3. The underwater internal rotor motor of claim 1, wherein the rotor assembly (2) includes a motor shaft (21), a magnetic steel (22), a permanent magnet (23) and a fastening sleeve (24), the motor shaft (21) is inserted into the middle of the stator assembly (1), the magnetic steel (22) is located outside the motor shaft (21) and is fixedly connected to the motor shaft (21), the permanent magnet (23) is fixed outside the magnetic steel (22) by means of adhesion, and the fastening sleeve (24) is of a cylindrical structure and is sleeved outside the permanent magnet (23).

4. An internal rotor underwater motor according to claim 3, wherein said motor shaft (21) is fixed with said magnetic steel (22) by means of key connection and/or adhesive connection.

5. An internal rotor underwater motor according to claim 1, characterized in that said cover (3) comprises an inner shell ring (31), a first bolt (32) and a second bolt (33), wherein said inner shell ring (31) is fixedly connected with said outer shell (13) and said inner shell (14) by said first bolt (32) and said second bolt (33), respectively.

6. The inner rotor underwater motor according to claim 5, wherein said stator assembly (1) further comprises a first O-ring (15) and a second O-ring (16), wherein said first O-ring (15) is located on the periphery side of said fastening bolt (12) and is used for sealing the gap between said inner shell (14) and said outer shell (13); the second O-ring (16) is located between the outer shell (13) and the inner shell (14) ring.

7. An internal rotor underwater motor according to claim 5, wherein the cover (3) further comprises a snap spring (34), an oiling bolt (35) and a third O-ring (36), the third O-ring (36) being located between the inner shell (14) and the inner shell ring (31), the snap spring (34) and the oiling bolt (35) being fixedly arranged outside the inner shell ring (31).

8. An inner rotor underwater motor according to claim 3, characterized in that said rotor assembly (2) further comprises at least one bearing (25), said bearing (25) being fixedly arranged between said motor shaft (21) and said stator assembly (1);

when the number of the bearings (25) is two, the two bearings (25) are respectively positioned at the left side and the right side of the magnetic steel (22).

9. The inner rotor submersible motor according to claim 8, wherein the rotor assembly (2) further comprises an inner baffle ring (26) between the motor shaft (21) and the housing (13), the inner baffle ring (26) abutting the bearing (25) and being arranged on a side remote from the magnetic steel (22).

10. An internal rotor underwater motor according to claim 1, wherein a motor control board (5) is further fixed inside said sealed chamber (4).