Deep sea propulsion integrated driving system and surface three-proofing coating method thereof

Abstract

The invention provides a deep sea propulsion integrated driving system and a surface three-proofing coating method thereof, and belongs to the technical field of motors. The problems existing in the technology of an existing deep sea propulsion integrated driving system are solved. Through integration of the motor driving device, the rotating speed state feedback device and the motor control device, electric driving and control over the deep sea propelling device are achieved, and then stable and reliable operation of the whole driving system is guaranteed. Effective coupling of the motor driving device, the rotating speed state feedback device and the motor control device is realized in a deep sea limited diving depth environment, and the size and the structural weight of the whole driving system are reduced while the heat dissipation performance of each subsystem is fully met. Meanwhile, aiming at the environment characteristics of high humidity, high salinity and easy mildewing of the deep sea propulsion integrated driving system, the invention provides a coating method meeting the three-proofing requirements, and the stable and reliable operation of the whole deep sea detector is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric motors, and in particular relates to a deep-sea propulsion integrated drive system and a surface three-proof coating method thereof. Background Art

[0002] Conventional land-based drive systems involve motor drive devices and speed state feedback devices that can be well coupled, without the need for special design. However, motor control devices are usually large in size and need to be built in a separate cabinet. Even though there are integrated products that couple inverters and motors on the market, their power density, volume and weight still cannot meet the requirements of deep-sea operation devices.

[0003] Due to long-term deep-sea cruising operations at different diving depths, the harsh working environment has prominent characteristics such as high humidity, high salinity, and easy mildew. A special three-proof design is required to isolate the adverse effects of the working environment on the performance of the internal components of the drive system, thereby ensuring the operating life of the motor drive device, speed state feedback device, and motor control device.

[0004] Most of the existing deep-sea propulsion devices still use the idea of ​​land-based motors, with the motor control device built into the deep-sea detector separately, and electrically connected to the motor drive device through a sealing device or a watertight plug-in cable. While considering the functional design and electromagnetic compatibility design of the control device, its heat dissipation system still occupies a large structural weight and volume space, which is not conducive to the center adjustment and overall design of the deep-sea detector. Summary of the invention

[0005] In view of this, in order to solve the defects or deficiencies in the technology of the existing deep-sea propulsion integrated drive system, the present invention proposes a deep-sea propulsion integrated drive system. The design concept of this system is to realize the electric drive and control of the deep-sea propulsion device through the integrated integration of the motor drive device, the speed state feedback device and the motor control device, thereby ensuring the stable and reliable operation of the entire drive system. The present invention realizes the effective coupling of the motor drive device, the speed state feedback device and the motor control device in a deep-sea limited diving depth environment, while fully meeting the heat dissipation performance of each subsystem, reducing the volume and structural weight of the entire drive system. At the same time, in view of the high humidity, high salinity and easy mildew environment characteristics of the deep-sea propulsion integrated drive system, a coating method that meets the three protection requirements is proposed to ensure the stable and reliable operation of the entire deep-sea detector.

[0006] To achieve the above object, the present invention adopts the following technical solution: a deep-sea propulsion integrated drive system, comprising a motor drive device, a speed state feedback device and a motor control device connected in sequence,

[0007] The motor drive device comprises a rotor, a stator, an extension end cover bearing group and a tail end cover bearing group, a stator is installed between the extension end cover bearing group and the tail end cover bearing group, and a rotor is passed through the stator.

[0008] Furthermore, the rotor includes a surface mounted magnet, a yoke, a main shaft and a balance ring. The yoke is machined with a dovetail groove to radially limit the surface mounted magnet, and the balance ring is sleeved on the main shaft to axially limit the surface mounted magnet.

[0009] Furthermore, the main shaft is made of TC4 titanium alloy and can be a solid shaft or a hollow shaft with a center hole.

[0010] Furthermore, the stator includes a winding stator core and a machine base, and the outer side of the winding stator core is milled flat and circumferentially positioned with a convex key of the machine base.

[0011] Furthermore, the extended end cover bearing group includes an extended end cover, an extended end angular contact bearing, a shaft penetration seal, a static seal between the front end cover and the machine base, a round nut, a locking washer and a retaining ring. The extended end cover is designed with a shaft penetration seal groove and a static seal groove between the front end cover and the machine base, and is bolted to the machine base through a stopper positioning, and the outside is directly in contact with seawater. The extended end angular contact bearing is selected according to the propeller blade propulsion load and is installed back to back to balance the axial force. The round nut and locking washer are used for axial positioning of the bearing.

[0012] Furthermore, the tail end cover bearing group includes a tail end inner cover, a tail end ball bearing, a wave spring, a protective cover, a round nut and a locking washer. The tail end inner cover is built into the machine base and axially positioned by a stopper and fixed to the machine base with bolts. The tail end inner cover is designed with a speed status feedback device installation stopper and a bolt positioning hole.

[0013] Furthermore, the speed state feedback device is located on the inner end cover of the tail end, and can adopt a rotary transformer or an encoder.

[0014] Furthermore, the motor control device includes a pressure-resistant casing, a control device, a windmill-type radiator and a rear sealing cover. The pressure-resistant casing is connected to the base by means of stopper positioning bolts. The stopper is designed with a static sealing groove. The control device is located inside the pressure-resistant casing and is installed on the surface of the windmill-type radiator. The windmill-type radiator and the pressure-resistant casing are matched with a small gap, and thermal conductive silicone grease is applied to the matching surface to ensure heat dissipation performance.

[0015] Furthermore, the rear sealing cover is connected to the pressure-resistant shell by means of stopper positioning bolts. The rear sealing cover is designed as a flange type with a static sealing groove. The static sealing groove on the flange and the deep-sea detector wall plate form a sealed cavity, which is directly connected to the incoming cable of the battery.

[0016] Furthermore, the rear sealing cover is designed to be flange-free and without static sealing grooves, a watertight connector interface is designed on the rear sealing cover, and a watertight plug-in is used to connect the incoming cable of the battery.

[0017] A surface three-proof coating method for a deep-sea propulsion integrated drive system comprises the following steps:

[0018] (1) The surfaces of the parts of the deep-sea propulsion integrated drive system that come into contact with seawater shall be shot peened with a surface coverage of not less than 80% to improve the surface strength and paint adhesion rate of the parts;

[0019] (2) Remove dust and oil stains from the surface;

[0020] (3) Prepared by aerodynamic spraying technology, the bottom material is sprayed with 2 layers of DTAl40 aluminum-rich coating, the coating dry film thickness is 60-100 μm, and dried at room temperature 25°C for no less than 24 hours, which mainly plays a role in resisting seawater corrosion;

[0021] (4) The intermediate layer is prepared by aerodynamic spraying technology. The intermediate layer is sprayed with 10 layers of DTT120 elastomer coating. The coating dry film thickness is 0.4 mm to 0.6 mm. The coating is dried at 60°C to 70°C for 3 hours. The main function is to resist wear and erosion.

[0022] (5) The topcoat is 2 coats of epoxy resin topcoat with a dry film thickness of 60 to 80 μm and is dried at room temperature of 25°C for no less than 24 hours.

[0023] Compared with the prior art, the deep-sea propulsion integrated drive system and the surface three-proof coating method thereof described in the present invention have the following beneficial effects:

[0024] (1) The deep-sea propulsion integrated drive system of the present invention is optimized to adopt methods such as external motor control device in a sealed housing, integrated coupling of motor drive device, speed state feedback device and motor control device, etc., to solve the problems that the motor control device needs to be separately built into the deep-sea detector, which occupies additional volume and space and has poor cooling effect, and when the control device and the motor drive device are connected by a cable, the cable is too long, which brings difficulties in electromagnetic compatibility design. The motor control device is directly cooled by seawater as a cooling medium, which improves the cooling effect of the control device while reducing the additional space occupied by the deep-sea detector, shortens the length of the connecting cable between the control device and the motor end, and reduces the difficulty of electromagnetic compatibility design, etc.

[0025] (2) The three-proof coating method for the surface of the deep-sea propulsion integrated drive system of the present invention avoids the long-term contact of the exterior of the propulsion system with seawater, resulting in harsh environmental conditions such as high humidity, high salinity, and easy mildew, and reduces the electrochemical corrosion of the surface of the deep-sea propulsion integrated drive system and the reduction of the strength of the pressure-resistant shell, thereby improving the service life and operational reliability of the drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 This is a front view of a deep-sea propulsion integrated drive system according to an embodiment of the present invention;

[0028] Figure 2 A front view of a motor drive device according to an embodiment of the present invention;

[0029] Figure 3 A front view of a rotor of a motor drive device according to an embodiment of the present invention;

[0030] Figure 4 A side view of a rotor of a motor drive device according to an embodiment of the present invention;

[0031] Figure 5 A front view of a stator of a motor drive device according to an embodiment of the present invention;

[0032] Figure 6 Schematic diagram of processing of a stator convex key and a flat concave key on the outer side of a stator core with windings according to an embodiment of the present invention, wherein (a) is a schematic diagram of processing of a stator convex key, and (b) is a schematic diagram of processing of a flat concave key on the outer side of a stator core with windings;

[0033] Figure 7 It is a front view of an extended end cover bearing assembly according to one embodiment of the present invention;

[0034] Figure 8 It is a front view of a tail end cover bearing assembly according to one embodiment of the present invention;

[0035] Fig. 9 A front view of a motor control device according to an embodiment of the present invention;

[0036] Fig.10 A front view of a motor control device according to an embodiment of the present invention;

[0037] Fig.11 A front view of a motor control device according to another embodiment of the present invention;

[0038] Fig.12This is a process flow chart of the surface three-proof coating of the deep-sea propulsion integrated drive system described in the present invention;

[0039] In the figure: a motor drive device 1, a speed state feedback device 2, a motor control device 3, a rotor 4, a stator 5, an extension end cover bearing group 6, a tail end cover bearing group 7, a surface mounted magnetic steel 8, a yoke 9, a main shaft 10, a balance ring 11, a stator core with winding 12, a machine base 13, an extension end cover 14, an extension end angular contact bearing 15, a shaft penetration seal 16, a static seal between the front end cover and the machine base 17, a round nut and a locking washer 18, a retaining ring 19, a tail end inner end cover 20, a tail end ball bearing 21, a wave spring 22, a protective cover 23, a round nut and a retaining washer 24, a pressure-resistant housing 25, a control device 26, a windmill radiator 27, a rear sealing cover 28, and a watertight plug-in 29. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0041] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. For example, "including" or "comprising" used throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the implementation of the present invention, but the description is still based on the general principles of the specification and is not used to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the attached claims.

[0042] like Figure 1 As shown, the deep-sea propulsion integrated drive system includes a motor drive device 1, a speed state feedback device 2 and a motor control device 3 which are connected in sequence.

[0043] like Figure 2 As shown, a motor drive device 1 includes a designed rotor 4, a stator 5, an extension end cover bearing group 6 and a tail end cover bearing group 7, a stator 5 is installed between the extension end cover bearing group 6 and the tail end cover bearing group 7, and the stator 5 is penetrated by the rotor 4.

[0044] like Figure 3As shown, the rotor 4 includes a surface mounted magnetic steel 8, a magnetic yoke 9, a main shaft 10, a balance ring 11, etc. The main shaft 10 is covered with a surface mounted magnetic steel 8, the magnetic yoke 9 is processed with a dovetail groove to radially limit the surface mounted magnetic steel 8, and the balance ring 11 is sleeved on the main shaft 10 to axially limit the magnetic steel 8.

[0045] Taking into consideration the comprehensive structural design and the three-proof design, the main shaft 10 is made of TC4 titanium alloy and can be a solid shaft or a hollow shaft with a center hole to reduce weight.

[0046] like Figure 5 As shown, the stator 5 includes a winding stator core 12 and a base 13. The base 13 is a pressure-resistant shell, which is directly in contact with seawater on the outside. In order to reduce the weight of the structure and meet the impact of the submersible pressure on the mechanical properties of the structure and the deep-sea working conditions on the three-proof performance, 5A06 aluminum alloy is used. The winding stator core 12 has a potting end, and the casing can also be filled with oil. The outer side of the winding stator core 12 is milled flat and circumferentially positioned with the convex key of the base 13.

[0047] like Figure 7 As shown, the extension end cover bearing group 6 includes the extension end cover 14, the extension end angular contact bearing 15, the shaft penetration seal 16, the front end cover and the machine base static seal 17, the round nut and the locking washer 18, the retaining ring 19, etc. The extension end cover 14 is designed with a shaft penetration seal groove and a front end cover and the machine base static seal groove, and is bolted to the machine base 13 through the stopper, and the outside is directly in contact with seawater. The extension end angular contact bearing 15 is selected according to the propulsion load of the blade, and is installed back to back to balance the axial force. The round nut and the locking washer 18 are used for the axial positioning of the bearing.

[0048] like Figure 8 As shown, the tail end cover bearing group 7 includes the tail end inner cover 20, the tail end ball bearing 21, the wave spring 22, the protective cover 23, the round nut and its locking washer 24, etc. The tail end inner cover 20 is built into the base 13, and is axially positioned by the stopper and fixed to the base by bolts. The tail end inner cover 20 is designed with a speed state feedback device 2 installation stopper and a bolt positioning hole.

[0049] The speed state feedback device 2 is located on the inner end cover 20 at the rear end, and may be a rotary transformer, an encoder, or the like.

[0050] like Figure 9-10As shown, the motor control device 3 includes a pressure-resistant shell 25, a control device 26, a windmill radiator 27, a rear sealing cover 28, etc. The pressure-resistant shell 25 is connected to the base 13 by a stopper positioning bolt, and the stopper is designed with a static sealing groove. The outside of the pressure-resistant shell directly contacts the seawater and is made of 5A06 aluminum alloy. The control device 26 is located inside the pressure-resistant shell 25. Considering the three-proof design, the control components and the circuit board surface are encapsulated with resin and are integrally installed on the surface of the windmill radiator 27. The windmill radiator 27 and the pressure-resistant shell 25 are matched with a small gap, and the matching surface is coated with thermal conductive silicone grease to ensure heat dissipation performance. The rear sealing cover 28 is connected to the pressure-resistant shell 25 by a stopper positioning bolt, and the outside is directly in contact with seawater and is made of 5A06 aluminum alloy. The rear sealing cover 28 is designed as a flange type with a static sealing groove. The static sealing groove on the flange and the deep-sea detector wall plate form a sealed cavity, which is directly connected to the incoming cable of the battery.

[0051] The motor control device 3 can realize another mode of the present invention by designing the rear sealing cover 28 to be a type without flange and static sealing groove, designing a watertight connector interface on the rear sealing cover 28, and using a watertight plug-in 29 to connect the incoming cable of the battery, such as Fig.11 shown.

[0052] like Fig.12 As shown, the surface three-proof coating method of the deep-sea propulsion integrated drive system includes the following steps:

[0053] (1) The surfaces of the parts of the deep-sea propulsion integrated drive system that come into contact with seawater shall be shot peened with a surface coverage of not less than 80% to improve the surface strength and paint adhesion rate of the parts;

[0054] (2) Remove dust and oil stains from the surface;

[0055] (3) Prepared by aerodynamic spraying technology, the bottom material is sprayed with 2 layers of DTAl40 aluminum-rich coating (composed of modified epoxy resin, high-purity aluminum powder, additives, and solvents), the coating dry film thickness is 60 to 100 μm, and dried at room temperature 25°C for no less than 24 hours, which mainly plays a role in resisting seawater corrosion;

[0056] (4) The intermediate layer is prepared by aerodynamic spraying technology. Ten layers of DTT120 elastomer coating (composed of polyurethane, silicon carbide, aluminum oxide, etc.) are sprayed. The coating dry film thickness is 0.4 mm to 0.6 mm. The coating is dried at 60°C to 70°C for 3 hours. The main function is to resist wear and erosion.

[0057] (5) The topcoat is 2 coats of epoxy resin topcoat with a dry film thickness of 60 to 80 μm and is dried at room temperature of 25°C for no less than 24 hours.

[0058] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A deep-sea propulsion integrated drive system, characterized in that: It comprises a motor drive device (1), a speed state feedback device (2) and a motor control device (3) which are connected in sequence. The motor drive device (1) comprises a rotor (4), a stator (5), an extension end cover bearing group (6) and a tail end cover bearing group (7), wherein a stator (5) is installed between the extension end cover bearing group (6) and the tail end cover bearing group (7), and a rotor (4) is penetrated inside the stator (5).

2. The deep-sea propulsion integrated drive system according to claim 1, characterized in that: The rotor (4) comprises a surface-mounted magnetic steel (8), a magnetic yoke (9), a main shaft (10) and a balance ring (11); the main shaft (10) is covered with a surface-mounted magnetic steel (8); the magnetic yoke (9) is processed with a dovetail groove to radially limit the surface-mounted magnetic steel (8); and the balance ring (11) is sleeved on the main shaft (10) to axially limit the surface-mounted magnetic steel (8).

3. The deep-sea propulsion integrated drive system according to claim 1, characterized in that: The stator (5) comprises a winding stator core (12) and a machine base (13), and the outer side of the winding stator core (12) is milled flat to perform circumferential positioning with a convex key of the machine base (13).

4. The deep-sea propulsion integrated drive system according to claim 1, characterized in that: The extended end cover bearing group (6) comprises an extended end cover (14), an extended end angular contact bearing (15), a round nut and a locking washer (18) and a retaining ring (19). The extended end cover (14) is designed with a sealing groove at the shaft through-hole and a static sealing groove between the front end cover and the machine base, and is bolted to the machine base (13) through a stopper, and is directly in contact with seawater on the outside. The extended end angular contact bearing (15) is selected according to the propulsion load of the blade and is installed back-to-back to balance the axial force. The round nut and the locking washer (18) are used for axial positioning of the bearing.

5. The deep-sea propulsion integrated drive system according to claim 1, characterized in that: The tail end cover bearing assembly (7) comprises a tail end inner cover (20) and a tail end ball bearing (21); the tail end inner cover (20) is built into the machine base (13) and axially positioned by means of a stopper and fixed to the machine base (13) by means of bolts; a rotation speed state feedback device mounting stopper and a bolt positioning hole are designed on the tail end inner cover (20).

6. The deep-sea propulsion integrated drive system according to claim 5, characterized in that: The speed state feedback device (2) is located on the inner end cover (20) at the rear end and may adopt a rotary transformer or an encoder.

7. The deep-sea propulsion integrated drive system according to claim 1, characterized in that: The motor control device (3) comprises a pressure-resistant shell (25), a control device (26), a windmill-type radiator (27) and a rear sealing cover (28); the pressure-resistant shell (25) is connected to the machine base (13) by means of stopper positioning bolts, the stopper is designed with a static sealing groove; the control device (26) is located inside the pressure-resistant shell (25) and is installed on the surface of the windmill-type radiator (27); the windmill-type radiator (27) and the pressure-resistant shell (25) are matched with a small gap, and thermal conductive silicone grease is applied to the matching surface to ensure heat dissipation performance.

8. The deep-sea propulsion integrated drive system according to claim 7, characterized in that: The rear sealing cover (28) is connected to the pressure-resistant shell (25) by means of stopper positioning bolts. The rear sealing cover (28) is designed as a flange type with a static sealing groove. The static sealing groove on the flange and the deep-sea detector wall plate form a sealed cavity, which is directly connected to the incoming cable of the battery.

9. The deep-sea propulsion integrated drive system according to claim 7, characterized in that: The rear sealing cover (28) is designed to be flange-free and without static sealing grooves. A watertight connector interface is designed on the rear sealing cover (28), and a watertight plug-in unit (29) is used to connect the incoming cable of the battery.

10. A surface three-proof coating method for a deep-sea propulsion integrated drive system according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) The surfaces of the parts of the deep-sea propulsion integrated drive system that come into contact with seawater shall be shot peened with a surface coverage of not less than 80% to improve the surface strength and paint adhesion rate of the parts; (2) Remove dust and oil stains from the surface; (3) Prepared by aerodynamic spraying technology, the bottom material is sprayed with 2 layers of DTAl40 aluminum-rich coating, the coating dry film thickness is 60-100 μm, and dried at room temperature 25°C for no less than 24 hours, which mainly plays a role in resisting seawater corrosion; (4) The intermediate layer is prepared by aerodynamic spraying technology. The intermediate layer is sprayed with 10 layers of DTT120 elastomer coating. The coating dry film thickness is 0.4 mm to 0.6 mm. The coating is dried at 60°C to 70°C for 3 hours. The main function is to resist wear and erosion. (5) The topcoat is 2 coats of epoxy resin topcoat with a dry film thickness of 60 to 80 μm and is dried at room temperature of 25°C for no less than 24 hours.

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