CN109080809A - Magnetic coupling deep-water propeller and its assemble method - Google Patents
Magnetic coupling deep-water propeller and its assemble method Download PDFInfo
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- CN109080809A CN109080809A CN201810920864.3A CN201810920864A CN109080809A CN 109080809 A CN109080809 A CN 109080809A CN 201810920864 A CN201810920864 A CN 201810920864A CN 109080809 A CN109080809 A CN 109080809A
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- end cap
- drive
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- 230000008878 coupling Effects 0.000 title claims abstract description 71
- 238000010168 coupling process Methods 0.000 title claims abstract description 71
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 45
- 238000003825 pressing Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 4
- 239000004519 grease Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012913 prioritisation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 108010085603 SFLLRNPND Proteins 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- UZVHFVZFNXBMQJ-UHFFFAOYSA-N butalbital Chemical compound CC(C)CC1(CC=C)C(=O)NC(=O)NC1=O UZVHFVZFNXBMQJ-UHFFFAOYSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000001141 propulsive effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
- B63H21/17—Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H23/00—Transmitting power from propulsion power plant to propulsive elements
- B63H23/32—Other parts
- B63H23/321—Bearings or seals specially adapted for propeller shafts
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/132—Submersible electric motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H23/00—Transmitting power from propulsion power plant to propulsive elements
- B63H23/32—Other parts
- B63H23/321—Bearings or seals specially adapted for propeller shafts
- B63H2023/327—Sealings specially adapted for propeller shafts or stern tubes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
Magnetic coupling deep-water propeller of the present invention and its assemble method, it is proposed a kind of new sealing structure and assemble method, without water pressure compensation liquid and seal grease, by installing sealed coupling set additional between inner and outer rotors, to form the airtight cavity for being directed to driving motor, achieve the purpose that for motor and external environment to be effectively isolated.Magnetic coupling deep-water propeller includes a hollow cylinder；Drive end bearing bracket and rear end cap are respectively fixed at cylinder both ends；Servo motor is fixed between rear end cap and motor rack, impeller, which runs through, is connected to drive end bearing bracket；In the driveshaft end of servo motor, it is connected with outer rotor；In the output shaft end of impeller, it is connected with internal rotor；Coupling cover is arranged between inner barrel, outer rotor and internal rotor, coupling cover is extruded in motor rack by drive end bearing bracket from outside to inside；Inside airtight cavity for accommodating servo motor, outer rotor is collectively formed by cylinder, rear end cap and coupling cover.
Description
Technical field
The present invention is a kind of underwater propeller, is suitable for the spiral shell within the scope of deep water more particularly to using magnetic coupling device
Oar propulsive unit is revolved, underwater navigation and electric propulsion technical field are belonged to.
Background technique
In the current progress of deepwater regions on water surface or under water scientific research, mineral products detection process, it will usually which use is with electric power
For the power plant of driving, such as in the water surface or submarine navigation device.Its electric pushing device is mainly used to push aircraft flight,
Or controllable torque is provided and is adjusted with controlling research equipment to needing position and angle etc..
The push system that common aircraft uses is to pass through coupling of shaft system propeller rotation catheter combination with from motor
It uses.In profundal zone when operation, generally requires by filling pressure compensation mode inside propeller and balance the pressure of external water, together
When by shafting rotatory sealing to prevent water from entering.
The earlier patent application of the following contents such as disclosed, and application number CN201410637179.1 is entitled to have rotary collecting
The deep brush-less Dc motor propeller in full sea of dress formula mechanical seal, uses brshless DC motor to drive ducted propeller, shafting
Sealing is realized by one group of special rotation integrated mechanical sealing device.But such mechanical seal structure, after long-time
The leakage that can lead to pressure compensation liquid because of abrasion, does not finally have sealing effect and water is caused to enter inside motor, easily lead
It sends a telegraph the damage of pushing system component and fails.
For another example following earlier application patent, application number CN201210355036.2, a kind of small underwater magnetic coupling of title push away
Into device device, scheme, which is DC motor drives case, drives external propeller by Magnetic Pole Coupling, outside entire motor
Shell seal with O ring.If such sealing device is used for deepwater regions, the thickness of magnetic shield must be increased, then correspondingly increased
Propeller self weight, it is clear that be unfavorable for carrying out the adjustment of propeller oneself state and angle in the biggish deepwater regions of hydraulic pressure.
Meanwhile being analyzed from the bearing jointing structure of Magnetic Pole Coupling inner and outer Rotator, necessarily it is not suitable for biggish load, therefore
The limitation of above-mentioned sealing means is larger, can not be applicable to deepwater regions compared with high thrust.
In view of this, special propose present patent application.
Summary of the invention
Magnetic coupling deep-water propeller of the present invention and its assemble method are to solve above-mentioned of the existing technology ask
It inscribes and proposes a kind of new sealing structure and assemble method, without water pressure compensation liquid and seal grease, by inside and outside turn
Install sealed coupling set between son additional, to form the airtight cavity for being directed to driving motor, reaching has motor and external environment
Imitate the purpose of isolation.
To realize above-mentioned purpose of design, the magnetic coupling deep-water propeller mainly includes:
One hollow cylinder；
Drive end bearing bracket and rear end cap are respectively fixed at cylinder both ends；
Servo motor is fixed between rear end cap and motor rack, impeller, which runs through, is connected to drive end bearing bracket；With the prior art
It is in place of difference,
In the driveshaft end of servo motor, it is connected with outer rotor；
In the output shaft end of impeller, it is connected with internal rotor；
Coupling cover is arranged between inner barrel, outer rotor and internal rotor, coupling cover is squeezed by drive end bearing bracket from outside to inside
In motor rack；
Inside airtight cavity for accommodating servo motor, outer rotor is collectively formed by cylinder, rear end cap and coupling cover.
As above-mentioned basic scheme forms magnetic coupling between inner and outer Rotator by coupling cover.The power output of servo motor
Square is transferred to impeller, and the output shaft of impeller is rotated synchronously with the drive shaft of servo motor, defeated eventually by control servo motor
The steering and torque size of shaft, realize displacement propulsion and the pose adjustment of propeller.
The coupling cover, inner and outer Rotator is kept apart, and receiving servo motor is collectively formed with cylinder, rear end cap
Airtight cavity, i.e. electric drive components are closed in this, can effectively guarantee electric component using safe.In addition, coupling
Trap is extruded in motor rack by drive end bearing bracket from outside to inside, then when propeller is in deepwater regions, the hydraulic pressure that is gradually increased is from outer
Side is applied to coupling cover, can not influence the sealing effect of coupling cover, therefore propeller described herein can be fitted preferably
For deepwater regions.
Further optimize is with the improvement project for improving sealing effect, cylinder inboard wall is provided with step, motor rack is logical
Overcoupling set is anchored on step from outside to inside；
At least one set of first sealing ring is provided with outside coupling cover.
Corrective measure for sealing performance between rear end cap and cylinder has, and rear end cap is installed on cylinder by internal and external threads
Rear end, at least one set of second sealing ring is provided with outside rear end cap.
Corrective measure for sealing performance between drive end bearing bracket and cylinder has, and drive end bearing bracket is installed on cylinder by internal and external threads
Front end, at least one set of third sealing ring is provided with outside drive end bearing bracket.
Under the premise of stating coupling cover in use, the prioritization scheme for outer rotor is that outer rotor includes being sheathed on driving
The housing axis in shaft end portion；In junction, flat key simultaneously be inserted into drive shaft, housing axis positioning groove in.
By the mutual cooperation relationship of the flat key and positioning groove, outer rotor can more securely be installed on servo motor
Drive shaft, during transmitting magnetic coupling torque, in the drive shaft surface of servo motor " sliding " will not occur for outer rotor
Phenomenon advantageously ensures that and improves the net synchronization capability rotated between impeller output shaft and servo motor drive shaft.
Based on similar design concept, the prioritization scheme for internal rotor is that internal rotor includes being sheathed on output shaft end
The inner sleeve axis in portion, is provided with several screw holes on inner sleeve axis.Bolt can be used and hold out against impeller output shaft in screw hole, it will be interior
Rotor is anchored on impeller output shaft and guarantees that on impeller output shaft surface " sliding " phenomenon will not occur for internal rotor, similarly favorably
In guaranteeing and improve the net synchronization capability rotated between impeller output shaft and servo motor drive shaft.
In summary the improvement of magnetic coupling deep-water propeller structure, the application propose a kind of magnetic coupling deep-water propeller simultaneously
Assemble method.Drive end bearing bracket and rear end cap are installed at cylinder both ends respectively, servo is fixedly connected between rear end cap and motor rack
Motor, impeller, which runs through, is connected to drive end bearing bracket.Specifically,
In the driveshaft end of servo motor, outer rotor is connected；
In the output shaft end of impeller, internal rotor is connected；
Coupling cover is arranged between inner barrel, outer rotor and internal rotor, coupling cover is squeezed by drive end bearing bracket solid from outside to inside
Due to motor rack；
Inside airtight cavity for accommodating servo motor, outer rotor is collectively formed by cylinder, rear end cap and coupling cover.
In above-mentioned assembling process, the further improvement for coupling cover sealing means is that step is arranged in cylinder inboard wall；
When drive end bearing bracket is installed, motor rack is anchored on step from outside to inside together with coupling cover；
By at least one set of first sealing ring, sealing is formed between coupling cover and cylinder inboard wall.
It is that rear end cap is installed on cylinder by internal and external threads for the sealing means improvement between forward and backward end cap and cylinder
The rear end of body forms sealing by the second sealing ring of at least one set between rear end cap and cylinder inboard wall；
Drive end bearing bracket is installed on to the front end of cylinder by internal and external threads, by least one set of third sealing ring in drive end bearing bracket
Sealing is formed between cylinder inboard wall.
For between inner and outer Rotator and the axis connected assembling mode improvement be, by flat key simultaneously be inserted into drive shaft,
In the positioning groove of housing axis, then outer rotor is anchored on by driveshaft end by bolt；
By pressing closer the screw hole on bolt-through inner sleeve axis, internal rotor is anchored on output shaft end.
To sum up content, magnetic coupling deep-water propeller described herein and its assemble method have the advantage that
1, the confined space that protection servo motor is formed using the coupling cover of transmitting torque, is sealed in cylinder for electric component
It is internal and be effectively isolated with external aqueous environment realization, improve the Reliability & Maintainability that electric component uses.
2, existing propeller common water pressure compensation liquid and seal grease are eliminated, propeller self weight is advantageously reduced and is mentioned
Height controls flexible performance；
3, the sealing structure and assemble method taken, it is simple and easy, be conducive to control manufacturing cost and improve production effect
Rate.
Detailed description of the invention
Fig. 1 is the schematic diagram of the section structure of the magnetic coupling deep-water propeller；
Fig. 2 is the portion the A enlarged diagram in Fig. 1；
Fig. 3 is inner rotor core schematic diagram；
Fig. 4 is the schematic diagram of the another side Fig. 3；
Fig. 5 is outer-rotor structure schematic diagram；
Fig. 6 is the schematic diagram of the another side Fig. 5；
As shown in Figures 1 to 6, cylinder 1, drive end bearing bracket 2, rear end cap 3, motor rack 4, servo motor 5, impeller 6, outer rotor 7,
It is internal rotor 8, coupling cover 9, step 11, third sealing ring 21, the second sealing ring 31, drive shaft 51, output shaft 61, bearing 62, outer
Set axis 71, positioning groove 73, bolt 74, external rotor permanent magnet block 75, inner sleeve axis 81, screw hole 82, presses closer bolt 83, is interior flat key 72
Rotor permanent magnet block 85, the first sealing ring 91.
Specific embodiment
Embodiment 1, is with reference to the accompanying drawing described in further detail the application.
According to Fig. 1 to Fig. 6, a kind of novel magnetic coupling deep-water propeller mainly includes:
One hollow cylinder 1；
In the rear and front end of cylinder 1, drive end bearing bracket 2 and rear end cap 3 are installed by internal and external threads respectively；Outside rear end cap 3
Portion is provided with 2 group of second sealing ring 31, and 1 group of third sealing ring 21 is provided with outside drive end bearing bracket 2；
Servo motor 5 is fixed between rear end cap 3 and motor rack 4, impeller 6, which runs through, is connected to drive end bearing bracket 2；
In 51 end of drive shaft of servo motor 5, it is connected with outer rotor 7；Outer rotor 7 includes being sheathed on 51 end of drive shaft
Housing axis 71；In junction, flat key 72 simultaneously be inserted into drive shaft 51, housing axis 71 positioning groove 73 in.
In 61 end of output shaft of impeller 6, it is connected with internal rotor 8；Internal rotor 8 includes being sheathed on the interior of 61 end of output shaft
Axis 81 is covered, several screw holes 82 are provided on inner sleeve axis 81；
It is arranged with coupling cover 9 between outer rotor 7 and internal rotor 8,2 group of first sealing ring 91 is provided with outside coupling cover 9；Coupling
Trap 9 is extruded in motor rack 4 by drive end bearing bracket 2 from outside to inside；Step 11 is provided on 1 inner wall of cylinder, motor rack 4 is from outside to inside
It is anchored on step 11；
Inside closed chamber for accommodating servo motor 5, outer rotor 7 is collectively formed by cylinder 1, rear end cap 3 and coupling cover 9
Body.
Assemble method for above-mentioned magnetic coupling deep-water propeller includes:
At 1 both ends of cylinder drive end bearing bracket 2 and rear end cap 3 are installed respectively, are fixedly connected and watch between rear end cap 3 and motor rack 4
Motor 5 is taken, impeller 6, which runs through, is connected to drive end bearing bracket 2.Wherein,
Rear end cap 3 is installed on to the rear end of cylinder 1 by internal and external threads, by 2 group of second sealing ring 31 in rear end cap 3
Sealing is formed between 1 inner wall of cylinder；
Drive end bearing bracket 2 is installed on to the front end of cylinder 1 by internal and external threads, by 1 group of third sealing ring 21 in drive end bearing bracket 2
Sealing is formed between 1 inner wall of cylinder；
In 1 inner wall of cylinder, step 11 is set；When drive end bearing bracket 2 is installed, motor rack 4 is fastened from outside to inside together with coupling cover 9
In step 11；By 2 group of first sealing ring 91, sealing is formed between 1 inner wall of coupling cover 9 and cylinder；
When 51 end of drive shaft of servo motor 5 connects outer rotor 7, flat key 72 is inserted into drive shaft 51, outer simultaneously
In the positioning groove 73 for covering axis 71, then passes through bolt 74 and outer rotor 7 is anchored on 51 end of drive shaft；
When 61 end of output shaft of impeller 6 connects internal rotor 8, by pressing closer screw hole of the bolt 83 on inner sleeve axis 81
82, internal rotor 8 is anchored on 61 end of output shaft；
It is arranged coupling cover 9 inside cylinder 1, between outer rotor 7 and internal rotor 8, coupling cover 9 is from outside to inside by drive end bearing bracket 2
Motor rack 4 is fixed in extruding；
Inside closed chamber for accommodating servo motor 5, outer rotor 7 is collectively formed by cylinder 1, rear end cap 3 and coupling cover 9
Body.
As described above, similar technical solution can be derived in conjunction with the plan content that attached drawing and description provide.But it is all
Without departing from the plan content of structure of the invention, according to the technical essence of the invention to any part shape made by above description
Modification, equivalent variations and modification and each slight tune for forming component locations and structure of shape, size, connection type and mounting structure
It is whole, still fall within the interest field of technical solution of the present invention.
Claims (10)
1. a kind of magnetic coupling deep-water propeller includes cylinder (1), be individually fixed in cylinder (1) both ends drive end bearing bracket (2) and after
End cap (3) is fixed with servo motor (5) between rear end cap (3) and motor rack (4), and impeller (6), which runs through, is connected to drive end bearing bracket
(2), it is characterised in that:
In drive shaft (51) end of servo motor (5), it is connected with outer rotor (7)；
In output shaft (61) end of impeller (6), it is connected with internal rotor (8)；
Cylinder (1) is internal, is arranged with coupling cover (9) between outer rotor (7) and internal rotor (8), coupling cover (9) from outside to inside by
Drive end bearing bracket (2) is extruded in motor rack (4)；
The inside for accommodating servo motor (5), outer rotor (7) is collectively formed by cylinder (1), rear end cap (3) and coupling cover (9)
Airtight cavity.
2. magnetic coupling deep-water propeller according to claim 1, it is characterised in that: in cylinder (1), inner wall is provided with step
(11), motor rack (4) is anchored on step (11) by coupling cover (9) from outside to inside；
At least one set of first sealing ring (91) is provided with outside coupling cover (9).
3. magnetic coupling deep-water propeller according to claim 2, it is characterised in that: rear end cap (3) is pacified by internal and external threads
Rear end loaded on cylinder (1) is provided at least one set of second sealing ring (31) outside rear end cap (3).
4. magnetic coupling deep-water propeller according to claim 3, it is characterised in that: drive end bearing bracket (2) is pacified by internal and external threads
Front end loaded on cylinder (1) is provided at least one set of third sealing ring (21) outside drive end bearing bracket (2).
5. magnetic coupling deep-water propeller according to claim 1 or 2, it is characterised in that: outer rotor (7) includes being sheathed on drive
The housing axis (71) of moving axis (51) end；
In junction, flat key (72) simultaneously be inserted into drive shaft (51), housing axis (71) positioning groove (73) in.
6. magnetic coupling deep-water propeller according to claim 1 or 2, it is characterised in that: internal rotor (8) is defeated including being sheathed on
The inner sleeve axis (81) of shaft (61) end is provided with several screw holes (82) on inner sleeve axis (81).
7. the assemble method of magnetic coupling deep-water propeller as described in claim 1 to 6 installs front end at cylinder (1) both ends respectively
(2) and rear end cap (3) are covered, is fixedly connected between rear end cap (3) and motor rack (4) servo motor (5), impeller (6) is through company
It is connected to drive end bearing bracket (2), it is characterised in that:
In drive shaft (51) end of servo motor (5), connect outer rotor (7)；
In output shaft (61) end of impeller (6), connect internal rotor (8)；
It is arranged coupling cover (9) between cylinder (1) inside, outer rotor (7) and internal rotor (8), coupling cover (9) is preceding from outside to inside
Motor rack (4) are fixed in end cap (2) extruding；
The inside for accommodating servo motor (5), outer rotor (7) is collectively formed by cylinder (1), rear end cap (3) and coupling cover (9)
Airtight cavity.
8. magnetic coupling deep-water propeller assemble method according to claim 7, it is characterised in that: in cylinder (1), inner wall is set
Set step (11)；
When drive end bearing bracket (2) are installed, motor rack (4) is anchored on step (11) from outside to inside together with coupling cover (9)；
By at least one set of first sealing ring (91), sealing is formed between coupling cover (9) and cylinder (1) inner wall.
9. magnetic coupling deep-water propeller assemble method according to claim 8, it is characterised in that: by internal and external threads will after
End cap (3) is installed on the rear end of cylinder (1), through at least one set of second sealing ring (31) in rear end cap (3) and cylinder (1)
Sealing is formed between wall；
Drive end bearing bracket (2) is installed on to the front end of cylinder (1) by internal and external threads, is existed by least one set of third sealing ring (21)
Sealing is formed between drive end bearing bracket (2) and cylinder (1) inner wall.
10. magnetic coupling deep-water propeller assemble method according to claim 9, it is characterised in that: simultaneously by flat key (72)
Be inserted into drive shaft (51), housing axis (71) positioning groove (73) in, then by bolt (74) outer rotor (7) is anchored on drive
Moving axis (51) end；
By pressing closer the screw hole (82) of bolt (83) on inner sleeve axis (81), internal rotor (8) is anchored on output shaft (61) end
Portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810920864.3A CN109080809A (en) | 2018-08-14 | 2018-08-14 | Magnetic coupling deep-water propeller and its assemble method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810920864.3A CN109080809A (en) | 2018-08-14 | 2018-08-14 | Magnetic coupling deep-water propeller and its assemble method |
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| Publication Number | Publication Date |
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| CN109080809A true CN109080809A (en) | 2018-12-25 |
Family
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109795663A (en) * | 2019-01-16 | 2019-05-24 | 浙江省海洋开发研究院 | A kind of propeller for vessels tailing axle drive mechanism |
| CN112298513A (en) * | 2020-10-30 | 2021-02-02 | 株洲中车时代电气股份有限公司 | Driver device of underwater propeller |
| CN115001234A (en) * | 2022-08-03 | 2022-09-02 | 深圳市盛泰奇科技有限公司 | Servo motor convenient to mount with coupler |
| NL2032766A (en) * | 2021-11-10 | 2023-06-07 | Nat Deep Sea Ct | Deep-sea magnetic coupling isolation oil compensation propulsion device |
| CN117498646A (en) * | 2023-12-12 | 2024-02-02 | 东莞市素派驱动科技有限公司 | Magnetic conduction ultra-silent speed changing device of submersible motor |
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| CN112298513A (en) * | 2020-10-30 | 2021-02-02 | 株洲中车时代电气股份有限公司 | Driver device of underwater propeller |
| NL2032766A (en) * | 2021-11-10 | 2023-06-07 | Nat Deep Sea Ct | Deep-sea magnetic coupling isolation oil compensation propulsion device |
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Application publication date: 20181225 |