Heavy-load type deep sea motor

Abstract

The invention relates to the technical field of motors, and discloses a heavy load type deep sea motor which comprises a motor shell, the interior of the motor shell is composed of an electromagnetic cavity and a bearing cavity, an electromagnetic shaft system is arranged in the electromagnetic cavity, a bearing shaft system is arranged in the bearing cavity, and the electromagnetic shaft system comprises a stator and a rotor. The stator and the rotor are used for generating electromagnetic torque, the bearing shaft system comprises a bearing shaft, torque is transmitted between the electromagnetic shaft system and the bearing shaft system through a transmission connecting piece, axial relative movement can occur at the joint of the electromagnetic shaft system and the bearing shaft system, and a cooling circulation assembly is arranged outside the motor shell. The two relatively independent cavities are arranged in the motor shell, and the electromagnetic shaft system for providing power is separated from the bearing shaft system for transmitting power, so that the design of the bearing shaft system is basically not limited by an electromagnetic structure, a bearing with higher bearing capacity can be selected, and the axial force bearing capacity of the motor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a heavy-load deep-sea motor. Background Art

[0002] As core devices that convert electrical energy into mechanical energy, electric motors play an indispensable role in marine engineering, particularly in heavy-duty equipment such as deep-sea submersibles (such as ROVs and AUVs), underwater propulsion systems, subsea operation tools, and deep-sea winches. These applications typically require motors to not only withstand the immense hydrostatic pressure of the deep sea but also operate stably and long-term under high loads.

[0003] Currently, motors used in deep-sea environments typically employ a one-piece design. This means the motor's rotor is directly attached to a single main shaft, which is supported by a bearing system within the motor housing. This design faces two significant technical bottlenecks that are difficult to reconcile: First, there's a structural conflict between load bearing and power generation. In applications like driving centrifugal pumps, motors are subject to significant axial thrust, which is transmitted directly through the main shaft to the motor's internal bearing system. To withstand this axial force, the motor must be equipped with thrust bearings. However, this significant axial force not only rapidly accelerates bearing wear, leading to premature failure, but more seriously, it also causes minute axial displacement and deformation of the main shaft. This displacement directly disrupts the crucial, extremely small, uniform air gap between the stator and rotor. At best, this can lead to reduced motor efficiency, increased vibration, and increased noise. In worse cases, it can cause the stator and rotor to scrape against each other, resulting in catastrophic damage to the motor in a short period of time. Therefore, conventional motor structures cannot effectively guarantee reliability and service life when subjected to heavy axial loads.

[0004] Second, there is the problem of inefficient heat dissipation. When a heavy-duty motor is operating, its core components, such as the stator winding and rotor, generate a large amount of heat due to the current effect. In the sealed, high-pressure environment of the deep sea, heat is difficult to dissipate effectively. Traditional cooling methods rely on the cooling medium (such as insulating oil) filled inside the motor to transfer heat to the motor casing through natural convection, and then the motor is cooled by the deep sea water outside. This passive heat dissipation method is inefficient, especially at high power output. Heat accumulates in large quantities inside the motor (especially in the electromagnetic core area where heat generation is the highest), resulting in localized excessive temperatures. This not only accelerates the aging of the insulation material and reduces motor performance, but may even burn the motor due to overheating, seriously affecting the motor's operating stability and safety.

[0005] In summary, existing deep-sea motors generally suffer from structural design issues such as weak axial load-bearing capacity, susceptibility of core power components to damage from axial forces, and uneven and inefficient heat dissipation, making them difficult to meet the increasingly stringent requirements of deep-sea heavy-load applications. Therefore, developing a new heavy-duty deep-sea motor that can effectively isolate axial loads while also providing efficient heat dissipation has become a pressing technical challenge in this field. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a heavy-duty deep-sea motor, which solves the problems of the existing deep-sea motors generally having a small axial force bearing capacity and a high temperature rise of high-power deep-sea motors.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a heavy-loaded deep-sea motor, comprising a motor housing, the interior of the motor housing consisting of an electromagnetic cavity and a load-bearing cavity, an electromagnetic shaft system is provided inside the electromagnetic cavity, a load-bearing shaft system is provided inside the load-bearing cavity, the electromagnetic shaft system comprises a stator and a rotor, the stator and the rotor are used to generate electromagnetic torque, the load-bearing shaft system comprises a load-bearing shaft, torque is transmitted between the electromagnetic shaft system and the load-bearing shaft system through a transmission connection, the connection between the electromagnetic shaft system and the load-bearing shaft system can undergo axial relative movement, and a cooling circulation component is provided on the outside of the motor housing.

[0008] Preferably, the cooling circulation component includes a circulation pump, which is fixedly connected to one end of the motor housing. The input and output ends of the circulation pump are connected to a cooling pipeline, and the cooling pipeline is connected to the electromagnetic cavity and the bearing cavity.

[0009] Preferably, the circulation pump is used to pump the cooling medium out of the bearing cavity, cool it through the cooling pipeline, and then pump it into the electromagnetic cavity.

[0010] Preferably, outside the motor housing, the cooling pipeline is a spiral tube, and the spiral tube surrounds one side of the outer wall of the motor housing.

[0011] Preferably, two bearing bearings are fixedly connected inside the bearing cavity, and both ends of the bearing shaft are fixedly connected inside the two bearing bearings.

[0012] Preferably, a rotor shaft and two radial bearings are provided inside the electromagnetic cavity, the rotor shaft is fixedly connected to the outer surface of the rotor, the two radial bearings are fixedly connected to the inside of the electromagnetic cavity, and both ends of the rotor shaft are fixedly connected to the inside of the two radial bearings.

[0013] Preferably, the transmission connection member is fixedly connected between the rotor shaft and the bearing shaft.

[0014] Preferably, the transmission connection is a spline connection or a flat key connection.

[0015] Preferably, the two load-bearing bearings are a pair of angular contact ball bearings.

[0016] Preferably, the radial bearing is a rolling bearing.

[0017] The present invention provides a heavy-duty deep-sea motor with the following beneficial effects: 1. The present invention separates the electromagnetic shaft system that provides power from the load-bearing shaft system that transmits power by establishing two relatively independent cavities in the motor housing, so that the design of the load-bearing shaft system is basically not restricted by the electromagnetic structure, and the selection of the shaft diameter and bearing model of the load-bearing shaft system is more flexible, and bearings with higher load-bearing capacity can be selected, thereby improving the axial force bearing capacity of the motor.

[0018] 2. In the present invention, the axial force is transmitted to the motor housing through the load-bearing bearing of the load-bearing shaft system, and then transmitted to the external support by the motor housing. The load-bearing shaft system and the electromagnetic shaft system can float relatively in the axial direction, so that the axial force flow does not pass through the electromagnetic shaft system, thereby improving the stress state of the electromagnetic shaft system and keeping the heating part of the electromagnetic structure away from the load-bearing bearing, thereby improving the situation in the existing motor where multiple heat sources are too concentrated and the local temperature is too high.

[0019] 3. In the present invention, the motor oil in the electromagnetic cavity flows into the bearing cavity through the cooling circulation component, and then returns to the electromagnetic cavity through the cooling pipeline, thereby strengthening the flow of motor oil inside the motor, making the motor oil temperature inside the motor more uniform, and further improving the situation of local excessive temperature; in addition, the spiral tube located outside the motor housing in the cooling pipeline increases the heat dissipation area, improves the heat exchange speed, and can reduce the speed of motor temperature rise. At the same time, the specific motor oil flow direction makes the temperature of the motor oil flowing into the electromagnetic cavity lower, improves the electromagnetic working environment, and makes the motor performance more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A perspective view of the present invention; Figure 2 is a schematic diagram of a cooling cycle assembly of the present invention; Figure 3 is a schematic diagram of the load-bearing cavity of the present invention; Figure 4 is a schematic diagram of the electromagnetic cavity of the present invention; Figure 5 is a schematic diagram of a transmission connecting member of the present invention; Figure 6 Schematic diagram of the electromagnetic shaft system of the present invention; Figure 7 is a schematic diagram of the load-bearing shaft system of the present invention; Figure 8It is a cross-sectional view of the motor housing of the present invention.

[0021] Among them, 1. Motor housing; 2. Electromagnetic cavity; 3. Load-bearing cavity; 4. Electromagnetic shaft system; 5. Load-bearing shaft system; 401. Stator; 402. Rotor; 501. Load-bearing shaft; 6. Transmission connector; 7. Cooling circulation assembly; 701. Circulating pump; 702. Cooling pipeline; 7021. Spiral tube; 301. Load-bearing bearing; 403. Rotor shaft; 201. Radial bearing; 3011. Angular contact ball bearing; 2011. Rolling bearing. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Please see the attached Figure 1 -Attached Figure 8 An embodiment of the present invention provides a heavy-loaded deep-sea motor, including a motor housing 1. The interior of the motor housing 1 is composed of an electromagnetic cavity 2 and a load-bearing cavity 3. An electromagnetic shaft system 4 is provided inside the electromagnetic cavity 2, and a load-bearing shaft system 5 is provided inside the load-bearing cavity 3. The electromagnetic shaft system 4 includes a stator 401 and a rotor 402. The stator 401 and the rotor 402 are used to generate electromagnetic torque. The load-bearing shaft system 5 includes a load-bearing shaft 501. Torque is transmitted between the electromagnetic shaft system 4 and the load-bearing shaft system 5 through a transmission connection 6. The connection between the electromagnetic shaft system 4 and the load-bearing shaft system 5 can undergo axial relative movement. A cooling circulation component 7 is provided on the outside of the motor housing 1.

[0024] Specifically, the heavy-duty deep-sea motor utilizes a monolithic motor housing 1, internally defining two functionally independent areas: the electromagnetic chamber 2 and the load-bearing chamber 3. This provides the foundation for efficient and reliable operation of the entire unit. Within the electromagnetic chamber 2, the core electromagnetic shafting 4 operates. Its stator 401, when energized, generates a rotating magnetic field, which in turn drives the rotor 402. This process converts electrical energy into mechanical energy, providing the primary electromagnetic torque for the entire device. Simultaneously, the load-bearing shafting 5, deployed within the load-bearing chamber 3, utilizes a robust internal load-bearing shaft 501 to withstand and transmit the immense axial loads from the external working device, thereby confining these destructive stresses within the load-bearing system. To transmit power from the source of power generation to the load-bearing component, a special transmission connector 6 is provided between the electromagnetic shafting 4 and the load-bearing shafting 5. While ensuring unrestricted torque transmission, its unique structural design allows for axial relative displacement between the two shafting systems, cleverly isolating axial forces from the electromagnetic components and thus ensuring the stability and safety of the power core. In addition, in order to cope with the huge amount of heat that is inevitably generated under heavy load conditions, the cooling circulation component 7 outside the motor housing 1 performs active heat dissipation tasks. It continuously circulates the cooling medium into the electromagnetic cavity 2 where the heat is most concentrated for cooling, ensuring that the motor can maintain stable performance even under extreme conditions, thereby improving the long-term working reliability of the device.

[0025] The cooling circulation assembly 7 includes a circulation pump 701 , which is fixedly connected to one end of the motor housing 1 . The input and output ends of the circulation pump 701 are connected to a cooling pipe 702 , which connects the electromagnetic cavity 2 and the bearing cavity 3 .

[0026] Specifically, the circulation pump 701 acts as a power source, generating continuous pressure to drive the cooling medium to flow in a specified loop, while the cooling pipe 702 constructs the channel of this loop, allowing the cooling medium to circulate between the functionally separated electromagnetic cavity 2 and the bearing cavity 3.

[0027] The circulation pump 701 is used to pump the cooling medium out of the bearing cavity 3 , cool it through the cooling pipe 702 , and then pump it into the electromagnetic cavity 2 .

[0028] Specifically, the work of the circulation pump 701 is not a simple circulation, but to extract the cooling medium from the load-bearing cavity 3 with a lower heat load, and after sufficient external cooling, accurately pump it into the electromagnetic cavity 2 where the heat is most concentrated, thereby achieving targeted cooling of the core heat-generating components and achieving the highest heat dissipation efficiency.

[0029] Outside the motor housing 1 , the cooling pipe 702 is a spiral tube 7021 , which surrounds one side of the outer wall of the motor housing 1 .

[0030] Specifically, the exterior of the cooling pipeline 702 is designed in the form of a spiral tube 7021, which increases the contact surface area between the pipeline and the external deep-sea environment, enhances the heat exchange effect, and enables the cooling medium flowing through the interior to be quickly cooled, preparing for the next cooling cycle.

[0031] Two bearing bearings 301 are fixedly connected inside the bearing cavity 3 , and both ends of the bearing shaft 501 are fixedly connected inside the two bearing bearings 301 .

[0032] Specifically, the two load-bearing bearings 301 are used to support the load-bearing shaft 501. Their main function is to withstand and absorb all huge axial impact forces from the outside and safely transmit these forces to the body. The load-bearing shaft 501 serves as a solid component that directly outputs torque to the outside and bears loads.

[0033] A rotor shaft 403 and two radial bearings 201 are provided inside the electromagnetic cavity 2. The rotor shaft 403 is fixedly connected to the outer surface of the rotor 402. The two radial bearings 201 are fixedly connected to the inside of the electromagnetic cavity 2. The two ends of the rotor shaft 403 are fixedly connected to the inside of the two radial bearings 201.

[0034] Specifically, the rotor shaft 403 is responsible for transmitting the original rotational power generated by electromagnetic induction of the rotor 402 to the outside. In order to ensure its stability and accuracy under high-speed rotation, the two radial bearings 201 provide necessary radial support, which ensures that the rotor system can operate smoothly and maintain the critical electromagnetic gap with the stator.

[0035] The transmission connection member 6 is fixedly connected between the rotor shaft 403 and the bearing shaft 501 .

[0036] Specifically, the function of the transmission connection member 6 is to transmit the electromagnetic torque generated by the rotor shaft 403 to the bearing shaft 501, thereby driving the external device to work.

[0037] The transmission connection 6 is a spline connection or a flat key connection.

[0038] Specifically, the transmission connector 6 adopts a spline connection or a flat key connection to allow axial relative sliding between the electromagnetic shaft system and the load-bearing shaft system while transmitting torque, thereby isolating the external axial force and protecting the precision electromagnetic components from being affected by it.

[0039] The two load-bearing bearings 301 are a pair of angular contact ball bearings 3011 .

[0040] Specifically, the structural characteristics of the angular contact ball bearing 3011 enable it to extremely effectively withstand and resist huge axial thrust, providing decisive support for the reliability of the entire device under the harsh working conditions of the deep sea.

[0041] The radial bearing 201 is a rolling bearing 2011 .

[0042] Specifically, the rolling bearing 2011 is used to ensure the operating efficiency of the power core. Its effect is to support the rotor shaft with an extremely low friction coefficient, reducing useless energy loss and wear, thereby improving the overall performance and service life of the motor.

[0043] Working principle: In actual use, when the motor is energized, the stator 401 located in the electromagnetic cavity 2 will generate a rotating magnetic field, thereby driving the rotor 402 and the rotor shaft 403 fixed thereto to rotate at high speed, generating a strong torque; at this time, the rotor shaft 403 is provided with precise radial support by the rolling bearings 2011 at both ends to ensure its stable rotation, and then the torque of the rotor shaft 403 is transmitted to the load-bearing shaft 501 through the rotating connection. At the same time, the rotating connection adopts a spline connection or a flat key connection, so that the rotating connection only transmits rotational torque, but allows the rotor shaft 403 and the load-bearing shaft 501 to have a certain relative floating in the axial direction. By utilizing this connection, the huge axial force generated by the external load is completely transmitted to the angular contact ball bearing 3011 in the load-bearing cavity 3, so that the huge axial force is completely intercepted in the load-bearing cavity 3, avoiding transmission to the electromagnetic cavity 2 and the rotor shaft 403. This makes the rolling bearing 2011 in the electromagnetic cavity 2 only bear pure radial support force, greatly improving the working environment and greatly improving the reliability and life of the motor.

[0044] When the motor is running, the part that generates the most heat is the stator 401 core and winding in the electromagnetic cavity 2. At this time, the circulating pump 701 located at one end of the motor housing 1 starts to work. It extracts motor oil from the relatively low-temperature bearing cavity 3 and pumps the motor oil into the spiral tube 7021 outside the motor. The spiral tube 7021 is in full contact with the deep sea water outside, and efficiently dissipates the heat of the motor oil into the environment through the tube wall, so that the temperature of the motor oil is significantly reduced. The cooled low-temperature motor oil is directly pumped into the electromagnetic cavity 2 by the circulating pump 701. The low-temperature motor oil flushes the surface of the stator 401 and the rotor 402, efficiently absorbing heat. Then, the motor oil that is full of heat again will pass through the channel between the electromagnetic cavity 2 and the bearing cavity 3, naturally flow back to the bearing cavity 3, and wait here to be extracted by the circulating pump 701 again for cooling, thereby realizing the cooling cycle.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A heavy-duty deep-sea motor, comprising a motor housing (1), characterized in that: The interior of the motor housing (1) is composed of an electromagnetic cavity (2) and a bearing cavity (3), an electromagnetic shaft system (4) is provided inside the electromagnetic cavity (2), a bearing shaft system (5) is provided inside the bearing cavity (3), the electromagnetic shaft system (4) includes a stator (401) and a rotor (402), the stator (401) and the rotor (402) are used to generate electromagnetic torque, the bearing shaft system (5) includes a bearing shaft (501), torque is transmitted between the electromagnetic shaft system (4) and the bearing shaft system (5) through a transmission connection (6), the connection between the electromagnetic shaft system (4) and the bearing shaft system (5) can undergo axial relative movement, and a cooling circulation component (7) is provided outside the motor housing (1).

2. A heavy-duty deep-sea motor according to claim 1, characterized in that: The cooling circulation assembly (7) comprises a circulation pump (701), the circulation pump (701) being fixedly connected to one end of the motor housing (1), the input end and the output end of the circulation pump (701) being connected to a cooling pipeline (702), and the cooling pipeline (702) being connected to the electromagnetic cavity (2) and the bearing cavity (3).

3. A heavy-duty deep-sea motor according to claim 2, characterized in that: The circulating pump (701) is used to pump the cooling medium out of the bearing cavity (3), cool it through the cooling pipeline (702), and then pump it into the electromagnetic cavity (2).

4. A heavy-duty deep-sea motor according to claim 2, characterized in that: Outside the motor housing (1), the cooling pipeline (702) is a spiral tube (7021), and the spiral tube (7021) surrounds one side of the outer wall of the motor housing (1).

5. A heavy-duty deep-sea motor according to claim 1, characterized in that: Two bearing bearings (301) are fixedly connected inside the bearing cavity (3), and both ends of the bearing shaft (501) are fixedly connected inside the two bearing bearings (301).

6. A heavy-duty deep-sea motor according to claim 1, characterized in that: A rotor shaft (403) and two radial bearings (201) are provided inside the electromagnetic cavity (2); the rotor shaft (403) is fixedly connected to the outer surface of the rotor (402); the two radial bearings (201) are fixedly connected inside the electromagnetic cavity (2); and both ends of the rotor shaft (403) are fixedly connected inside the two radial bearings (201).

7. A heavy-duty deep-sea motor according to claim 6, characterized in that: The transmission connection member (6) is fixedly connected between the rotor shaft (403) and the bearing shaft (501).

8. The heavy-duty deep-sea motor according to claim 1, characterized in that: The transmission connection (6) is a spline connection or a flat key connection.

9. The heavy-duty deep-sea motor according to claim 5, characterized in that: The two load-bearing bearings (301) are a pair of angular contact ball bearings (3011).

10. A heavy-duty deep-sea motor according to claim 6, characterized in that: The radial bearing (201) is a rolling bearing (2011).

Images