Internal and external differential pressure balancing device applied to marine electric push

Abstract

The utility model relates to the technical field of ocean engineering, and particularly discloses an internal and external differential pressure balancing device applied to a marine electric thruster, which comprises a thruster main body, and the front side of the inner wall of the thruster main body is fixedly connected with an oil bag; through the arrangement of the propeller main body, the oil bag, the rotating shaft, the rotor, the oil guide hole, the partition plate, the bearing and the oil seal, when the propeller is used, the oil bag stores silicon-based heat conduction oil and is communicated with the rotating shaft through the oil guide hole to dynamically adjust internal pressure: when external water pressure is increased, the oil bag is compressed and contracted, and the silicon-based heat conduction oil is pressed into an inner cavity of the propeller through the oil guide hole; internal oil pressure and external water pressure are balanced in real time, and structural deformation or sealing failure caused by pressure difference is avoided; a pressure balance mechanism of the oil bag synchronously counteracts extrusion of deep sea pressure to a motor cavity, and the oil seal adopts a multi-stage sealing structure, so that the propeller keeps power output, and meanwhile, the problems of sealing failure, insulation damage and mechanical deformation caused by pressure unbalance in a traditional design are thoroughly solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of ocean engineering technology, more particularly to a kind of inside and outside differential pressure balancing device applied to marine electric propulsion. BACKGROUND

[0002] In the field of ocean engineering technology, marine electric propulsion system is the core power component of underwater vehicle, and its performance and reliability are directly related to the efficiency and safety of the vehicle. With the increasing frequency of deep-sea exploration and resource development activities, the requirements for marine electric propulsion systems are becoming increasingly stringent, especially in the face of deep-sea high pressure, complex flow and other extreme environments, traditional electric propulsion systems often face severe tests.

[0003] Traditional marine electric propulsion systems often overlook the importance of internal and external pressure balance, resulting in significant pressure difference between the inside and outside of the propeller in deep-sea high pressure environment. This pressure difference not only causes deformation of the propeller structure, affecting the stability of power output, but also exacerbates the wear of the seal, leading to seal failure, and even causes insulation damage and mechanical failure. In deep-sea oil and gas field operations, deep-sea scientific research and other application scenarios, these problems are particularly prominent. For example, when the propeller is operating at a depth of 2500 meters, the external water pressure is as high as 25MPa. Traditional sealing structures are difficult to maintain effective sealing for a long time in such high pressure environment. Once leakage occurs, it not only affects the normal operation of the propeller, but also threatens the overall safety of the vehicle. Therefore, it needs to be improved by the staff. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a kind of inside and outside differential pressure balancing device applied to marine electric propulsion, to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A kind of inside and outside differential pressure balancing device applied to marine electric propulsion, comprising:

[0007] Propeller body;

[0008] The inner wall of the propeller body is fixedly connected with an oil bladder, and the inner wall of the propeller body is rotatably connected with a shaft, and the surface of the shaft is installed with a rotor;

[0009] The inner wall of the shaft is provided with an oil guide hole at one end of the oil bladder;

[0010] The inner wall of the propeller body is fixedly connected with a partition plate, the inner wall of the partition plate is fixedly connected with a bearing, and the inner wall of the bearing is fixedly connected to the connection between the shaft and the oil bladder;

[0011] The tail end of the rotating shaft is provided with an oil seal on the inner wall of the propeller body.

[0012] Preferably, the other end of the rotating shaft is fixedly connected with a propeller, and the surface of the propeller is rotatably connected to the tail end of the propeller body.

[0013] Preferably, the front end of the propeller body is provided with a plurality of groups of air holes, and the plurality of groups of air holes are uniformly distributed through holes.

[0014] Preferably, the bottom of the propeller body is fixedly connected with a pressure stabilizing guide ridge.

[0015] Compared with the prior art, the propeller has the advantages that:

[0016] (1) Through the arrangement of the propeller body, the oil bag, the rotating shaft, the rotor, the oil guide hole, the partition plate, the bearing and the oil seal, when in use, the oil bag stores silicon-based heat conducting oil and communicates with the rotating shaft through the oil guide hole, and the internal pressure is dynamically adjusted: when the external water pressure increases, the oil bag shrinks under pressure, and the silicon-based heat conducting oil is pressed into the propeller cavity through the oil guide hole, so that the internal oil pressure and the external water pressure are balanced in real time, and the structural deformation or sealing failure caused by the pressure difference is avoided; the pressure balance mechanism of the oil bag synchronously offsets the extrusion of the deep sea pressure on the motor cavity, the oil seal adopts a multi-stage sealing structure, and in the dynamic rotation process of the rotating shaft, the silicon-based heat conducting oil is prevented from leaking out, and seawater is prevented from penetrating in, the sealing efficiency is strengthened through the internal and external pressure balance, the balanced state of the internal oil pressure and the external water pressure significantly reduces the pressure difference load on both sides of the oil seal, so that the sealing interface always maintains stable contact; the partition plate physically isolates the pressure sensitive area from the motor cavity, forms a gradient pressure buffer layer, and realizes three protections of the propeller in the deep sea environment: the pressure self-adaptive system formed by the oil bag and the oil guide hole continuously matches the external water pressure change; the oil seal has the maximum sealing performance in the low pressure difference environment; the combination of the bearing and the partition plate guarantees the structural integrity of the mechanical transmission system under high pressure, and finally the propeller keeps the power output while completely solving the problems of sealing failure, insulation damage and mechanical deformation caused by pressure imbalance in the traditional design.

[0017] (2) By the propeller, air hole and pressure stabilizing guide ridge setting, use, propeller as the core power output component, under the drive of the rotating shaft, high-speed rotation, generates thrust to push the underwater vehicle forward; its blade is made of high-strength pressure-resistant material, ensures that the structure stability and propulsion efficiency can still be maintained under the deep sea high pressure environment, air hole is distributed in the front end of the propeller main body, through the inside and outside pressure adaptive exchange mechanism, balance the internal liquid pressure of the propeller and the external deep sea environment pressure in real time, prevent the shell deformation or sealing failure caused by pressure difference, at the same time, auxiliary adjustment internal oil circulation, pressure stabilizing guide ridge extends along the longitudinal direction of the propeller bottom, adopts fluid mechanics optimization design, effectively suppresses the transverse swing and vortex disturbance of the propeller in the deep sea complex flow, enhances the navigation stability, its rigid structure can also disperse the local impact of external water pressure on the propeller main body, and the pressure regulating function of the air hole is coordinated to ensure that the propeller maintains a smooth running track in the deep sea environment with high pressure and high flow rate, so that the propulsion system has pressure adaptability and dynamic stability while outputting strong thrust, and meets the strict requirements of deep sea operation on the reliability and control precision of the propeller. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a perspective view of the utility model;

[0019] Figure 2 It is a perspective view of the bearing of the utility model;

[0020] Figure 3 It is a perspective view of the oil bag of the utility model;

[0021] Figure 4 It is a perspective view of the utility model;

[0022] In the drawing: 1, propeller main body; 2, oil bag; 3, rotating shaft; 4, rotor; 5, oil guide hole; 6, partition plate; 7, bearing; 8, propeller; 9, air hole; 10, pressure stabilizing guide ridge; 11, oil seal. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0024] Embodiment one:

[0025] Please refer to Figures 1 to 4As shown, an internal and external differential pressure balancing device applied to an electric propeller for a ship, comprising: a propeller body 1, which serves as a support and protection shell of the overall structure and provides basic guarantee for stable operation in deep-sea high-pressure environment;

[0026] The inner wall of the propeller body 1 is fixedly connected with an oil bag 2, which stores silicon-based heat-conducting oil and communicates with the rotating shaft 3 through an oil guide hole 5, and its core function is to dynamically adjust the internal pressure: when the external water pressure increases, the oil bag 2 shrinks under pressure, and the silicon-based heat-conducting oil is pressed into the propeller cavity through the oil guide hole 5, so that the internal oil pressure and the external water pressure are balanced in real time, avoiding structural deformation or sealing failure caused by pressure difference. The inner wall of the propeller body 1 is rotatably connected with a rotating shaft 3, and the surface of the rotating shaft 3 is installed with a rotor 4. The rotating shaft 3 serves as the power transmission core and realizes low-friction rotation through a bearing 7. The double support design of the bearing 7 (combined with the rigid separation of the partition plate 6) further disperses the axial load brought by deep-sea high pressure, ensuring the coaxiality of the rotating shaft 3 in high-pressure environment. When the rotor 4 and the stator are electromagnetically matched to drive the rotating shaft 3 to rotate, the pressure balancing mechanism of the oil bag 2 synchronously offsets the extrusion of the deep-sea pressure on the motor cavity;

[0027] The inner wall of the rotating shaft 3 is provided with an oil guide hole 5 at one end of the oil bag 2;

[0028] The inner wall of the propeller body 1 is fixedly connected with a partition plate 6, the inner wall of the partition plate 6 is fixedly connected with a bearing 7, and the inner wall of the bearing 7 is fixedly connected at the connection between the rotating shaft 3 and the oil bag 2. The partition plate 6 physically isolates the pressure-sensitive area from the motor cavity, forming a gradient pressure buffer layer.

[0029] The tail end of the rotating shaft 3 is installed with an oil seal 11 on the inner wall of the propeller body 1. The oil seal 11 adopts a multi-stage sealing structure, which not only prevents the leakage of silicon-based heat-conducting oil, but also prevents seawater from penetrating in during the dynamic rotation of the rotating shaft 3. The sealing efficiency is strengthened through internal and external pressure balancing, and the balanced state of the internal oil pressure and the external water pressure significantly reduces the pressure difference load between the two sides of the oil seal 11, so that the sealing interface always maintains stable contact.

[0030] Example two:

[0031] Please refer to Figures 1 to 4As shown, the other end of the rotating shaft 3 is fixedly connected with a propeller 8, and the surface of the propeller 8 is rotatably connected to the tail end of the propeller body 1. The propeller 8 serves as a core power output component of the propeller and rotates at high speed under the drive of the rotating shaft 3 to generate thrust to push the underwater vehicle forward. The blades of the propeller 8 are made of high-strength pressure-resistant material to ensure that the structural stability and propelling efficiency can be maintained under the deep-sea high-pressure environment. A plurality of air holes 9 are formed in the front end of the propeller body 1, and the plurality of air holes 9 are uniformly distributed through holes. The air holes 9 are distributed on the front end of the propeller body 1, and through the internal and external pressure adaptive exchange mechanism, the internal liquid pressure of the propeller and the external deep-sea environmental pressure are balanced in real time to prevent the shell from deforming or the seal from failing due to the pressure difference, and to assist in adjusting the internal oil circulation. The bottom of the propeller body 1 is fixedly connected with a pressure stabilizing guide ridge 10, which extends longitudinally along the bottom of the propeller. The pressure stabilizing guide ridge 10 is designed by fluid mechanics optimization to effectively suppress the lateral swing and vortex disturbance of the propeller in the deep-sea complex water flow, thereby enhancing the navigation stability. The rigid structure of the pressure stabilizing guide ridge 10 can also disperse the local impact of external water pressure on the propeller body.

[0032] Example three:

[0033] Please refer to Figures 1 to 4 As shown, in the operation of a deep-sea oil and gas field, an ROV (Remote Operated Vehicle) needs to conduct regular inspection on a gas pipeline with a water depth of 2500 meters. The environmental pressure in this area is as high as 25 MPa, and there are irregular seabed topography and strong dark currents. The traditional propeller often causes seal failure or unstable power due to pressure imbalance, affecting the inspection accuracy and equipment safety.

[0034] After the ROV is launched into the water with the internal and external differential pressure balancing device, as the diving depth increases, the external water pressure is preliminarily balanced with the internal oil system through the uniformly distributed air holes 9 in the front end of the propeller body 1. The oil bladder 2 is extruded by the external water pressure, and the silicon-based heat-conducting oil is pressed into the rotating shaft 3 and the motor cavity through the oil guide hole 5, so that the internal oil pressure quickly matches the 2500-meter water depth pressure, avoiding shell deformation.

[0035] During the inspection process, the ROV encounters local ocean current impact, and the pressure stabilizing guide ridge 10 offsets the lateral disturbance through fluid guide design to maintain the heading stability. At the same time, the oil bladder 2 compensates for the pressure fluctuation in real time: when the ROV passes through the low-lying part of the pipeline, the instantaneous water pressure rises to trigger the oil bladder 2 to further contract, and the oil guide hole 5 increases the oil supply to ensure that the pressure of the motor cavity is always synchronized with the outside, and the oil seal 11 maintains a zero leakage sealing interface under the low pressure difference state.

[0036] Precise positioning: the rotor 4 drives the rotating shaft 3 to rotate at high speed, and the rigid support system composed of the partition plate 6 and the bearing 7 disperses the axial load, so that the propeller can still output stable thrust in high pressure and strong flow, assisting the ROV to complete the millimeter-level close-up shooting of the pipeline weld.

[0037] Emergency response: when the ROV tilts due to sudden vortex, the air hole 9 and the oil bladder 2 linkage adjustment, 5 seconds to restore pressure balance, to avoid the sudden change in pressure difference caused by equipment alarm.

[0038] Working principle: the propeller body 1 as a whole support structure, the oil bladder 2 inside the storage of silicon-based heat transfer oil and through the oil hole 5 with the shaft 3 communication, when the external water pressure increases, the oil bladder 2 under pressure shrinkage will heat transfer oil into the propeller cavity, the internal oil pressure and external water pressure real-time dynamic balance, avoid the pressure difference caused by structural deformation; shaft 3 through the bearing 7 to realize low friction rotation, bearing 7 by the partition plate 6 provides rigid support to disperse the deep sea high pressure caused by the axial load, ensure the coaxial degree of the shaft 3; rotor 4 in electromagnetic drive driven shaft 3 rotation, the pressure regulating function of the oil bladder 2 synchronous offset deep sea pressure on the motor cavity extrusion; oil seal 11 using multi-stage sealing structure, in the internal and external pressure balance state effectively prevent the oil leakage and seawater infiltration; at the same time, the air hole 9 in the front of the propeller through the pressure adaptive exchange mechanism auxiliary regulation inside and outside the pressure difference, the bottom of the stable pressure guide ridge 10 through the fluid mechanics design to suppress the lateral disturbance, finally realize the propeller in the deep sea high pressure environment of sealing, structural stability and propulsion efficiency of the synergistic optimization.

[0039] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An internal and external differential pressure balancing device for use in marine electric propulsion applications, characterized by, Include: Propeller body (1); The inner wall of the propeller body (1) is fixedly connected with an oil bag (2), the inner wall of the propeller body (1) is rotatably connected with a rotating shaft (3), the surface of the rotating shaft (3) is provided with a rotor (4); The inner wall of the rotating shaft (3) is provided with an oil guide hole (5) at one end of the oil bag (2); The inner wall of the propeller body (1) is fixedly connected with a partition plate (6), the inner wall of the partition plate (6) is fixedly connected with a bearing (7), and the inner wall of the bearing (7) is fixedly connected with the connecting portion of the rotating shaft (3) and the oil bag (2); The tail end of the rotating shaft (3) is provided with an oil seal (11) on the inner wall of the propeller body (1).

2. The superposed internal and external differential pressure balancing device for marine electric propulsion applications according to claim 1, characterized in that: The other end of the rotating shaft (3) is fixedly connected with a propeller (8), and the surface of the propeller (8) is rotatably connected with the tail end of the propeller body (1).

3. The superposed internal and external differential pressure balancing device for marine electric propulsion applications according to claim 1, characterized in that: The front end of the propeller body (1) is provided with a plurality of air holes (9), and the plurality of air holes (9) are uniformly distributed through holes.

4. The superposed internal and external differential pressure balancing device for marine electric propulsion applications according to claim 1, characterized in that: The bottom of the propeller body (1) is fixedly connected with a stable pressure guide ridge (10).

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