Optimized cooling structure of dry-type installation submersible motor

Abstract

The utility model relates to the field of motors, and discloses an optimized cooling structure of a dry-type installation submersible motor, which can improve the cooling efficiency of the dry-type installation submersible motor and solve the problem that the temperature rise of a motor bearing is too fast. Comprising a pump body, a stator, a rotor, a motor shell, a cooling jacket, a wire holder, a connecting seat and a pump cover. The end of the rotor shaft sequentially penetrates through the connecting base and the pump cover to be connected to the pump body, the stator surrounds the outer side of the rotor, the motor shell surrounds the outer side of the stator, and the two ends of the motor shell are in sealed connection with the wire holder and the connecting base respectively to form a first sealed cavity in the motor shell. The cooling jacket is sleeved outside the motor shell, and two ends of the cooling jacket are respectively connected with the wire holder and the connecting seat in a sealing manner, so that a second closed cavity is formed between the cooling jacket and the motor shell. The second end side of the rotor is provided with an axial-flow fan blade, the axial-flow fan blade rotates around the axis of the bearing to form airflow, the airflow flows to the first end side of the rotor from the second end side of the rotor and then flows back to the second end side to form circular flow, and heat exchange is conducted in the process that the airflow flows back to the second end side from the first end side.

Description

Technical Field

[0001] This application relates to the field of electric motors, and specifically to an optimized cooling structure for a dry-mounted submersible motor. Background Technology

[0002] With the increasing application of high-power submersible motors, especially in water pumps and pumping systems, motor cooling technology has become a key factor in improving equipment operational stability and extending service life. Submersible motors are typically classified into wet-mounted and dry-mounted types. High-power submersible motors (power greater than 355kW) face more significant cooling challenges when installed in a dry-mounted configuration.

[0003] In wet mounting, the motor casing is directly submerged in water, and the water flow effectively cools the motor, ensuring it remains within a low temperature range during operation and preventing damage from overheating. Wet mounting offers superior cooling, particularly suitable for the heat dissipation needs of high-power motors. However, wet-mounted motors have certain limitations, such as the inability to pump water below the casing level and unsuitability for certain environmental conditions.

[0004] Dry mounting relies on an external cooling jacket for cooling. However, since there is no water medium outside the cooling jacket, the cooling rate is limited by air conduction, resulting in less effective cooling compared to wet mounting. This is especially true for high-power motors, where heat buildup significantly impacts bearing temperature rise. Excessive bearing temperature rise not only shortens bearing life but can also lead to motor malfunctions. Summary of the Invention

[0005] The purpose of this application is to provide an optimized cooling structure for a dry-mounted submersible motor, which can improve the cooling efficiency of the dry-mounted submersible motor and solve the problem of excessive temperature rise in the motor bearings.

[0006] This application discloses an optimized cooling structure for a dry-mounted submersible motor, comprising: a pump body, a motor stator, a motor rotor, a motor housing, a cooling jacket, a terminal block, a connecting base, and a pump cover;

[0007] The end of the motor rotor shaft passes through the connecting seat and the pump cover in sequence and is connected to the pump body. The motor stator surrounds the outside of the motor rotor, and the motor housing surrounds the outside of the motor stator. The two ends of the motor housing are respectively sealed to the terminal block and the connecting seat, thereby forming a first sealed cavity inside the motor housing.

[0008] The cooling jacket is fitted over the outside of the motor housing, and both ends of the cooling jacket are sealed to the terminal block and the connecting block, respectively, thereby forming a second sealed cavity between the cooling jacket and the motor housing;

[0009] An axial flow fan is provided on the second end side of the motor rotor. The axial flow fan rotates around the axis of the bearing to form an airflow. The airflow flows from the second end side of the motor rotor to the first end side of the motor rotor in the first sealed cavity, and then flows back to the second end side to form a circulating flow. The airflow exchanges heat with the medium in the second sealed cavity during the process of flowing from the first end side back to the second end side.

[0010] In a preferred embodiment, the inner wall of the motor housing is provided with a plurality of airflow guiding grooves in the circumferential direction. The airflow flows into the airflow guiding grooves from the first end side, exchanges heat with the medium in the second sealed cavity in the airflow guiding grooves, and then flows back to the second end side.

[0011] In a preferred embodiment, the airflow flows toward the first end side through the air gap between the stator and the rotor and through the lamination holes on the rotor.

[0012] In a preferred embodiment, the length of the airflow guide groove is greater than the length of the motor stator.

[0013] In a preferred embodiment, there are 4-10 airflow guide slots.

[0014] In a preferred embodiment, it also includes an inlet pipe and an outlet pipe;

[0015] The first end of the inlet pipe extends into the second sealed cavity, and the second end of the inlet pipe is in fluid communication with the inner cavity of the pump body. The first end of the return pipe extends into the second sealed cavity, and the second end of the return pipe is in fluid communication with the inner cavity of the pump body. The fluid medium in the inner cavity of the pump body continuously flows into the second sealed cavity through the inlet pipe, and the medium in the second sealed cavity continuously flows back into the inner cavity of the pump body through the return pipe.

[0016] In a preferred embodiment, the first end of the inlet pipe is close to the second end of the second sealed cavity, and the first end of the return pipe is close to the first end of the second sealed cavity. The inlet pipe and the return pipe are arranged symmetrically about the axis of the bearing.

[0017] In a preferred embodiment, the terminal block includes an upper flange and a lower flange, with a plurality of connecting posts arranged circumferentially between the upper flange and the lower flange. A first bearing seat is provided at the center of the terminal block, which houses the first end of the bearing. A cavity is formed between the outer wall of the first bearing seat and the outer surfaces of the upper flange and the lower flange. The medium in the second sealed cavity is filled in the cavity and is in direct contact with the outer wall of the first bearing seat.

[0018] In a preferred embodiment, the connecting seat includes an upper flange and a lower flange, with a reinforcing rib provided between the upper flange and the lower flange. The reinforcing rib is a discontinuous annular shape. A second bearing seat is provided at the center of the connecting seat, which houses the second end of the bearing. A cavity is formed between the outer wall of the second bearing seat and the inner wall of the reinforcing rib. The medium in the second sealed cavity is filled in the cavity and is in direct contact with the outer wall of the second bearing seat.

[0019] In a preferred embodiment, the connector is further provided with an oil-water detection probe inlet. The oil-water detection probe passes through the upper flange and the lower flange of the connector via the oil-water detection probe inlet and extends into the leakage detection chamber inside the pump cover. The oil-water detection probe is configured to detect whether water or an oil-water mixture exists in the leakage detection chamber.

[0020] In a preferred embodiment, a first-stage mechanical seal is provided on the outer side of the bearing. The first-stage mechanical seal, together with the pump cover and the pump body, forms a water-sealed cavity. Fluid inside the pump body enters the water-sealed cavity but does not directly contact the bearing.

[0021] In a preferred embodiment, the pump cover is provided with an oil filler port, and a second-stage mechanical seal is provided on the outside of the bearing. The second-stage mechanical seal, the connecting seat, and the pump cover form an oil-sealed lubrication chamber. The oil filler port is in fluid communication with the oil-sealed lubrication chamber, and lubricating oil enters the oil-sealed lubrication chamber from the oil filler port.

[0022] In a preferred embodiment, the connecting seat is provided with a water outlet, and the pump cover is provided with a drain outlet. When the first-stage mechanical seal and the second-stage mechanical seal fail, the fluid in the pump body cavity enters the water-sealed cavity and then the oil-sealed lubrication cavity, and then enters the leakage detection cavity through the water outlet, and finally is discharged through the drain outlet.

[0023] In a preferred embodiment, the contact portion between the pump cover and the connecting seat is provided with a sealing ring for sealing the pump cover and the connecting seat.

[0024] In this embodiment, an axial flow fan is installed at the second end of the motor rotor. The fan rotates around the bearing axis to generate airflow. This airflow circulates within the motor housing, flowing from the second end of the motor rotor to the first end and then back to the second end, forming a closed airflow loop. This circulating airflow design effectively removes heat from inside the motor and exchanges heat with the medium in the cooling jacket, improving the motor's heat dissipation efficiency. It has a particularly significant effect on cooling the bearing area, avoiding the problems of poor cooling effect and excessively rapid bearing temperature rise associated with traditional dry-installation systems.

[0025] Furthermore, the airflow utilizes the gaps in the stator-rotor structure and, according to the law of heat rising, flows from the second end to the first end. Subsequently, by setting multiple airflow guide slots in the circumferential direction on the inner wall of the motor housing, the airflow path is optimized. The airflow flows from the first end into the airflow guide slots, exchanges heat with the medium in the second sealed cavity, and then flows back to the second end, effectively improving the cooling effect, ensuring uniform airflow within the motor housing, further enhancing the dissipation of heat inside the motor, avoiding heat accumulation, and improving the stability of the motor.

[0026] Furthermore, the fluid medium is introduced into the second sealed cavity through the inlet pipe, and the return pipe continuously flows it back into the pump body cavity, forming a continuous cooling fluid flow. Through a stable fluid supply, the cooling effect is ensured to be continuous. This cooling fluid circulation system works in effective heat exchange with the airflow in the airflow guide groove that flows continuously inside the motor housing. The airflow guide groove guides the airflow to exchange heat with the cooling fluid, thereby further improving the heat conduction and dissipation efficiency. The airflow carries away heat through heat exchange and transfers it to the cooling medium. The two media work together to ensure the rapid discharge of heat from inside the motor, achieving efficient temperature control and heat dissipation.

[0027] Furthermore, cavities are provided in the terminal block and connector, allowing heat from the bearing end to be conducted to the outer wall of the bearing seat and then transferred to the cooling medium. This ensures that the bearing is not affected by excessive heat, effectively preventing overheating and extending the bearing's service life.

[0028] Furthermore, the dual sealing design of the first-stage and second-stage mechanical seals ensures that the fluid does not come into direct contact with the motor bearings. At the same time, the oil-water detection probe and the leak outlet can detect leaks in a timely manner and effectively discharge the leaked liquid through the drain outlet, preventing the accumulation of leaked water or oil-water mixture inside the motor and causing damage to the motor.

[0029] The specification of this application contains numerous technical features distributed across various technical solutions. Listing all possible combinations of these technical features (i.e., technical solutions) would make the specification excessively lengthy. To avoid this problem, the various technical features disclosed in the above-described invention, the various technical features disclosed in the following embodiments and examples, and the various technical features disclosed in the accompanying drawings can be freely combined to form various new technical solutions (all of which are considered to have been described in this specification), unless such a combination of technical features is technically infeasible. For example, one example discloses feature A+B+C, and another example discloses feature A+B+D+E. Features C and D are equivalent technical means that serve the same function, and technically only one needs to be used; they cannot be used simultaneously. Feature E can technically be combined with feature C. Therefore, the solution A+B+C+D should not be considered as described because it is technically infeasible, while the solution A+B+C+E should be considered as described. Attached Figure Description

[0030] Figure 1 This is a cross-sectional schematic diagram of an optimized cooling structure for a dry-mounted submersible motor according to one embodiment of this application.

[0031] Figure 2 This is a cross-sectional schematic diagram of the terminal block structure of an optimized cooling structure for a dry-mounted submersible motor according to one embodiment of this application.

[0032] Figure 3 This is a three-dimensional schematic diagram of the terminal block structure of an optimized cooling structure for a dry-mounted submersible motor according to one embodiment of this application.

[0033] Figure 4 This is a cross-sectional schematic diagram of the connecting seat structure of an optimized cooling structure for a dry-mounted submersible motor according to one embodiment of this application.

[0034] Figure 5 This is a three-dimensional schematic diagram of the connecting seat structure of an optimized cooling structure for a dry-mounted submersible motor according to one embodiment of this application.

[0035] Figure 6 This is a cross-sectional schematic diagram of the pump cover structure of an optimized cooling structure for a dry-mounted submersible motor according to one embodiment of this application.

[0036] Figure 7 This is a three-dimensional schematic diagram of the pump cover structure of an optimized cooling structure for a dry-mounted submersible motor according to one embodiment of this application.

[0037] Figure 8This is a cross-sectional schematic diagram of the motor housing structure of an optimized cooling structure for a dry-mounted submersible motor according to one embodiment of this application.

[0038] Figure 9 This is a three-dimensional schematic diagram of the motor housing structure of an optimized cooling structure for a dry-mounted submersible motor according to one embodiment of this application.

[0039] Figure 10 This is a schematic diagram of the liquid cooling circulation direction of an optimized cooling structure for a dry-mounted submersible motor according to one embodiment of this application.

[0040] Figure 11 This is a schematic diagram of the gas cooling circulation direction of an optimized cooling structure for a dry-mounted submersible motor according to one embodiment of this application.

[0041] Figure 12 This is a partially enlarged view of an optimized cooling structure for a dry-mounted submersible motor according to one embodiment of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1-Pump body, 2-Motor stator, 3-Motor rotor, 4-Motor housing, 401-Inner wall, 402-Airflow guide groove, 403-First end of motor housing, 404-Second end of motor housing, 405-Crescent groove, 5-Cooling jacket, 6-Terminal block, 601-Upper flange of terminal block, 602-Lower flange of terminal block, 603-Connecting column, 604-First bearing seat, 605-Outer wall of first bearing seat, 607-Control cable mounting position, 608-Power cable mounting position, 7-Connecting seat, 701-Connector 702 - Upper flange, 703 - Lower flange of connecting seat, 704 - Reinforcing rib, 705 - Second bearing position, 706 - Outer wall of second bearing position, 707 - Inlet of oil and water detection probe, 708 - Leakage port, 801 - Contact part, 8 - Pump cover, 802 - Drain port, 9 - First sealed cavity, 10 - Second sealed cavity, 11 - Axial flow fan blade, 12 - Water inlet pipe, 13 - Water return pipe, 14 - First stage mechanical seal, 15 - Water seal cavity, 16 - Second stage mechanical seal, 17 - Oil seal lubrication cavity. Detailed Implementation

[0044] In the following description, many technical details are presented to help the reader better understand this application. However, those skilled in the art will understand that the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0045] the term

[0046] As used in this article, "up" and "down" refer to... Figure 1The direction in the text is intended to describe the relative position of the structure and the flow path, and is not intended to restrict the actual direction.

[0047] As used in this article, “first end” and “upper” refer to one direction, and “second end” and “lower” refer to another direction. These terms are used to describe the relative positional relationship of the components and are not intended to restrict the actual direction.

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0049] This application relates to an optimized cooling structure for a dry-mounted submersible motor, the structure of which is shown in the figure below. Figure 1-12 As shown, it includes: pump body 1, motor stator 2, motor rotor 3, motor housing 4, cooling jacket 5, terminal block 6, connecting block 7, and pump cover 8.

[0050] The shaft end of the motor rotor 3 passes through the connecting seat 7 and the pump cover 8 in sequence and is connected to the pump body 1. The motor stator 2 surrounds the outside of the motor rotor 3, and the motor housing 4 surrounds the outside of the motor stator 2. Both ends of the motor housing 4 are sealed to the terminal block 6 and the connecting seat 7, respectively, thereby forming a first sealed cavity 9 inside the motor housing 4. The cooling jacket 5 is fitted on the outside of the motor housing 4. Both ends of the cooling jacket 5 are sealed to the terminal block 6 and the connecting seat 7, respectively, thereby forming a second sealed cavity 10 between the cooling jacket 5 and the motor housing 4. An axial flow fan 11 is provided on the second end side of the motor rotor 3. The axial flow fan 11 rotates around the axis of the bearing to form an airflow. The airflow flows from the second end side of the motor rotor 3 to the first end side of the motor rotor 3 in the first sealed cavity 9, and then flows back to the second end side, forming a circulating flow. During the process of the airflow flowing from the first end side back to the second end side, it exchanges heat with the medium in the second sealed cavity 10.

[0051] In an optional embodiment, the inner wall 401 of the motor housing 4 is provided with a plurality of airflow guide grooves 402 in the circumferential direction. Airflow flows into the airflow guide grooves 402 from the first end side, exchanges heat with the medium in the second sealed cavity 10 in the airflow guide grooves 402, and then flows back to the second end side. Optionally, each airflow guide groove 402 may have a rectangular cross section. Alternatively, it may have a tapered trapezoidal cross section, with a groove opening width W1 of 3-5 mm, a groove bottom width W2 of 2-3 mm, a groove depth H of 4-6 mm, and a groove wall inclination angle α controlled at 15°±2°. Each airflow guide groove 402 is parallel to the bearing axis, or the axis of each guide groove forms a helical angle β of 25°-35° with the motor axis, and is distributed in a left-hand (or right-hand) spiral pattern along the circumference.

[0052] In an optional embodiment, both the first end 403 and the second end 404 of the motor housing are provided with flanges having a diameter larger than the diameter of the motor housing body. The flanges are sealed and fixed to the lower flange 602 of the terminal block and the upper flange 701 of the connector block, respectively.

[0053] In an alternative embodiment, the airflow flows to the first end side through the air gap between the stator and the rotor and through the lamination holes on the rotor.

[0054] In an optional embodiment, the length of the airflow guide groove 402 is greater than the length of the motor stator 2. Specifically, the axial length of the airflow guide groove 402 can be increased by 15-20 mm compared to the length of the stator core.

[0055] In one optional embodiment, there are 4-10 airflow guide slots 402, which are symmetrically distributed.

[0056] In an optional embodiment, the system further includes an inlet pipe 12 and a return pipe 13. The first end of the inlet pipe 12 extends into the second sealed cavity 10, and the second end of the inlet pipe 12 is in fluid communication with the inner cavity of the pump body 1. The first end of the return pipe 13 extends into the second sealed cavity 10, and the second end of the return pipe 13 is in fluid communication with the inner cavity of the pump body 1. The fluid medium in the inner cavity of the pump body 1 continuously flows into the second sealed cavity 10 via the inlet pipe 12, and the medium in the second sealed cavity 10 continuously flows back into the inner cavity of the pump body 1 via the return pipe 13.

[0057] In an optional embodiment, the first end of the water inlet pipe 12 is close to the second end of the second sealed cavity 10, and the first end of the water return pipe 13 is close to the first end of the second sealed cavity 10. The water inlet pipe 12 and the water return pipe 13 are arranged with the axis of the bearing as the center of symmetry.

[0058] In an optional embodiment, the terminal block 6 includes an upper flange 601 and a lower flange 602. A plurality of connecting posts 603 are provided between the upper flange 601 and the lower flange 602 in the circumferential direction. A first bearing seat 604 is provided at the axial center of the terminal block 6. The first bearing seat 604 accommodates the first end of the bearing. A cavity is formed between the outer wall 605 of the first bearing seat and the outer surfaces of the upper flange 601 and the lower flange 602. The medium in the second sealed cavity 10 is filled in the cavity and is in direct contact with the outer wall 605 of the first bearing seat.

[0059] In an optional embodiment, a control cable mounting position 607 is further provided at the center of the flange 601 on the terminal block. This control cable mounting position 607 is connected to the first bearing position 604 and is used to allow the control cable to pass through. A power cable mounting position 608 is also provided at the offset point of the flange 601 on the terminal block. This power cable mounting position 608 is connected to the first sealed cavity 9 and is used to allow the power cable to extend into the first sealed cavity 9.

[0060] In an optional embodiment, the connecting seat 7 includes an upper flange 701 and a lower flange 702. A reinforcing rib 703 is provided between the upper flange 701 and the lower flange 702. The reinforcing rib 703 is a discontinuous annular shape. A second bearing seat 704 is provided at the axial center of the connecting seat 7. The second bearing seat 704 accommodates the second end of the bearing. A cavity is formed between the outer wall 705 of the second bearing seat and the inner wall 401 of the reinforcing rib 703. The medium in the second sealed cavity 10 is filled in the cavity and is in direct contact with the outer wall 705 of the second bearing seat.

[0061] In an optional embodiment, the connector 7 is further provided with an oil-water detection probe inlet 706. The oil-water detection probe passes through the upper flange 701 and the lower flange 702 of the connector via the oil-water detection probe inlet and extends into the leakage detection chamber inside the pump cover 8. The oil-water detection probe is configured to detect whether water or an oil-water mixture exists in the leakage detection chamber.

[0062] In an optional embodiment, a first-stage mechanical seal 14 is provided on the outside of the bearing. The first-stage mechanical seal 14, together with the pump cover 8 and the pump body 1, forms a water-sealed cavity 15. Fluid inside the pump body 1 enters the water-sealed cavity 15 but does not directly contact the bearing.

[0063] In an optional embodiment, the pump cover 8 is provided with a filler port 801, and a second-stage mechanical seal 16 is provided on the outside of the bearing. The second-stage mechanical seal 16, the connecting seat 7, and the pump cover 8 form an oil-sealed lubrication chamber 17. The filler port 801 is in fluid communication with the oil-sealed lubrication chamber 17, and lubricating oil enters the oil-sealed lubrication chamber 17 from the filler port 801.

[0064] In an optional embodiment, the connecting seat 7 is provided with a water outlet 707 and the pump cover 8 is provided with a drain outlet 802. When the first-stage mechanical seal 14 and the second-stage mechanical seal 16 fail, the fluid in the inner cavity of the pump body 1 enters the water seal cavity 15 and then enters the oil seal lubrication cavity 17. Subsequently, it enters the leakage detection cavity through the water outlet 707 and is finally discharged through the drain outlet 802.

[0065] In an optional embodiment, the contact portion 708 between the pump cover 8 and the connecting seat 7 is provided with a sealing ring for sealing the pump cover 8 and the connecting seat 7.

[0066] In an optional embodiment, the second end 404 (lower end) edge of the motor housing is provided with two crescent-shaped grooves 405 symmetrically arranged with the bearing axis as the center. The crescent-shaped grooves 405 are used to accommodate and fix the water inlet pipe 12 and the water return pipe 13 respectively.

[0067] To better understand the technical solution of this application, a specific example is provided below. The details listed in this example are mainly for ease of understanding and are not intended to limit the scope of protection of this application.

[0068] This application provides an optimized cooling structure for dry-mounted submersible motors, primarily addressing the problem of excessively rapid bearing temperature rise. This cooling structure accelerates heat conduction and circulation by incorporating cooling airflow within the submersible motor, introducing circulating water, and facilitating heat exchange between the cooling airflow and the circulating water, thereby achieving more efficient heat dissipation.

[0069] The cooling structure includes main components such as a pump body 1, a motor stator 2, a motor rotor 3, a motor housing 4, a cooling jacket 5, a terminal block 6, a connecting seat 7, and a pump cover 8. The bearing end of the motor rotor 3 passes through the connecting seat 7 and the pump cover 8 and connects to the pump body 1. The motor stator 2 surrounds the motor rotor 3, and the motor housing 4 surrounds the stator and is sealed to the terminal block 6 and the connecting seat 7, forming a first sealed cavity 9. The cooling jacket 5 is fitted over the motor housing 4, and the two ends of the terminal block 6 and the connecting seat 7 are sealed together to form a second sealed cavity 10. An axial flow fan 11 is provided on the second end side of the motor rotor 3. The axial flow fan 11 rotates around the axis of the bearing to generate airflow. The airflow circulates within the first sealed cavity 9 and exchanges heat with the medium in the second sealed cavity 10.

[0070] To accelerate heat circulation and follow the principle of heat rising, an exhaust axial fan 11 is added to the lower part of the rotor. The heat generated by the rotor core during operation is blown by the axial fan 11 towards the non-axial fan 11 side as the rotor rotates. The heat is carried to the top of the motor housing 4 and further diffused through the airflow guide slots on the inner wall of the housing. Hot air is then conducted to the outer wall of the motor housing 4 through the walls of the airflow guide slots. The axial fan 11 accelerates airflow, optimizes air convection, and significantly improves the heat dissipation efficiency within the motor.

[0071] Based on the aforementioned airflow circulation, a water cooling circulation system is also provided in the second sealed cavity 10 between the motor housing 4 and the cooling jacket 5. This system includes an inlet pipe 12 and a return pipe 13. The first end of the inlet pipe 12 extends into the second sealed cavity 10, and the second end is fluidly connected to the inner cavity of the pump body 1. Similarly, the first end of the return pipe 13 extends into the second sealed cavity 10, and the second end is also fluidly connected to the inner cavity of the pump body 1. The fluid medium continuously flows from the inner cavity of the pump body 1 into the second sealed cavity 10 through the inlet pipe 12. The heat generated by the motor (hot air) exchanges heat with the fluid medium through the wall of the motor housing 4. The fluid returns to the inner cavity of the pump body 1 through the return pipe 13, forming a continuous cooling fluid flow. The fluid medium entering from the inlet pipe 12 gradually accumulates and the liquid level rises until it reaches the highest point of the second sealed cavity 10. Once the water level reaches this high point, it will stabilize at this position, forming a natural water level height. Afterward, the return water pipe 13, with its first end at the higher position, can guide the coolant from the second sealed cavity 10 back into the pump body 1, completing one cycle. Because the end of the return water pipe 13 is located in a region with a higher water level, the water can be smoothly returned to the pump body 1 using the force of gravity, ensuring continuous circulation of the coolant and good fluidity throughout the system. Furthermore, by maintaining a constant water level, the stability and continuity of the cooling effect can be guaranteed.

[0072] The outer walls of the bearing positions of terminal block 6 and connecting seat 7 can directly contact the fluid medium, thereby enhancing heat transfer efficiency. The upper flange 601 of the terminal block is sealed to the upper end cover of the motor, and the lower flange is sealed to the motor housing 4. The upper and lower flanges of the terminal block 6 are connected by a connecting post 603 to enhance the support strength. The upper flange 701 of the connecting seat is sealed to the motor housing 4, and the lower flange 702 of the connecting seat is sealed to the pump cover 8. A reinforcing rib 703 ring is provided between the upper and lower flanges of the connecting seat 7, optimizing the structure of the bearing position.

[0073] An oil-water detection probe inlet 706 is also provided on the connecting seat 7. The oil-water detection probe is used to detect leakage, ensuring that the cooling system can be detected and dealt with in a timely manner when a failure occurs. A filler port 801 is provided on the pump cover 8 to ensure the supply of lubricating oil. The second-stage mechanical seal 16, together with the pump cover 8 and the connecting seat 7, forms an oil-sealed lubrication chamber 17, providing continuous lubrication for the bearings. A drain hole is also provided between the lower flange of the pump cover 8 and the pump cover 8, allowing water or an oil-water mixture to drain through the drain hole after the mechanical seal fails, preventing liquid leakage from damaging the motor.

[0074] The general direction of the cooling cycle is briefly explained below:

[0075] The fluid medium first flows out of the inner cavity of the pump body 1, enters the inlet pipe 12, and continuously enters the second sealed cavity 10 through the inlet pipe 12. During this process, the cooling medium fills the second sealed cavity 10. When the fluid medium in the second sealed cavity 10 reaches its highest point, it flows back to the inner cavity of the pump body 1 through the return pipe 13.

[0076] While the liquid cooling cycle is in progress, the axial fan blades 11 at the lower end of the motor rotor 3 begin to rotate, generating airflow. This airflow propels the hot airflow within the first sealed cavity 9 upwards from the lower end of the rotor. As the airflow flows, the hot airflow passes through the airflow guide grooves 402 on the wall of the motor housing 4, which guide the hot air to flow along the channels within the grooves. Within the grooves, the hot airflow exchanges heat with the cooling liquid medium passing through the second sealed cavity 10, completing the heat transfer. Through heat exchange with the liquid medium, the airflow carries away the heat generated by the motor, thereby effectively controlling the internal temperature of the motor.

[0077] It should be noted that in this patent application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. In this patent application, if it refers to performing an action according to an element, it means performing the action at least according to that element, including two cases: performing the action only according to that element, and performing the action according to that element and other elements. Expressions such as "multiple," "repeatedly," and "various" include two, two times, two kinds, and more than two, more than two times, and more than two kinds.

[0078] All documents mentioned in this application are considered to be incorporated in their entirety into the disclosure of this application so that they can serve as a basis for modifications if necessary. Furthermore, it should be understood that after reading the foregoing disclosure of this application, those skilled in the art can make various alterations or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. An optimized cooling structure for a dry-mounted submersible motor, characterized in that, include: Pump body, motor stator, motor rotor, motor housing, cooling jacket, terminal block, connector and pump cover; The end of the motor rotor shaft passes through the connecting seat and the pump cover in sequence and is connected to the pump body. The motor stator surrounds the outside of the motor rotor, and the motor housing surrounds the outside of the motor stator. The two ends of the motor housing are respectively sealed to the terminal block and the connecting seat, thereby forming a first sealed cavity inside the motor housing. The cooling jacket is fitted over the outside of the motor housing, and both ends of the cooling jacket are sealed to the terminal block and the connecting block, respectively, thereby forming a second sealed cavity between the cooling jacket and the motor housing; An axial flow fan is provided on the second end side of the motor rotor. The axial flow fan rotates around the axis of the bearing to form an airflow. The airflow flows from the second end side of the motor rotor to the first end side of the motor rotor in the first sealed cavity, and then flows back to the second end side to form a circulating flow. The airflow exchanges heat with the medium in the second sealed cavity during the process of flowing from the first end side back to the second end side.

2. The optimized cooling structure for a dry-mounted submersible motor as described in claim 1, characterized in that, The inner wall of the motor housing is provided with a plurality of airflow guiding grooves in the circumferential direction. The airflow flows into the airflow guiding groove from the first end side, exchanges heat with the medium in the second sealed cavity in the airflow guiding groove, and then flows back to the second end side.

3. The optimized cooling structure for a dry-mounted submersible motor as described in claim 1, characterized in that, The airflow flows to the first end side through the air gap between the stator and the rotor and the lamination holes on the rotor.

4. The optimized cooling structure for a dry-mounted submersible motor as described in claim 1, characterized in that, It also includes inlet and outlet water pipes; The first end of the inlet pipe extends into the second sealed cavity, and the second end of the inlet pipe is in fluid communication with the inner cavity of the pump body. The first end of the return pipe extends into the second sealed cavity, and the second end of the return pipe is in fluid communication with the inner cavity of the pump body. The fluid medium in the inner cavity of the pump body continuously flows into the second sealed cavity through the inlet pipe, and the medium in the second sealed cavity continuously flows back into the inner cavity of the pump body through the return pipe.

5. The optimized cooling structure for a dry-mounted submersible motor as described in claim 1, characterized in that, The terminal block includes an upper flange and a lower flange, with multiple connecting posts arranged circumferentially between the upper flange and the lower flange. A first bearing seat is provided at the center of the terminal block, which houses the first end of the bearing. A cavity is formed between the outer wall of the first bearing seat and the outer surfaces of the upper flange and the lower flange. The medium in the second sealed cavity is filled in the cavity and is in direct contact with the outer wall of the first bearing seat.

6. The optimized cooling structure for a dry-mounted submersible motor as described in claim 1, characterized in that, The connecting seat includes an upper flange and a lower flange. A reinforcing rib is provided between the upper flange and the lower flange. The reinforcing rib is a discontinuous annular shape. A second bearing position is provided at the center of the connecting seat. The second bearing position accommodates the second end of the bearing. A cavity is formed between the outer wall of the second bearing position and the inner wall of the reinforcing rib. The medium in the second sealed cavity is filled in the cavity and is in direct contact with the outer wall of the second bearing position.

7. The optimized cooling structure for a dry-mounted submersible motor as described in claim 5, characterized in that, The connector is also provided with an oil-water detection probe inlet. The oil-water detection probe passes through the upper flange and the lower flange of the connector via the oil-water detection probe inlet and extends into the leakage detection chamber inside the pump cover. The oil-water detection probe is configured to detect whether water or an oil-water mixture exists in the leakage detection chamber.

8. The optimized cooling structure for a dry-mounted submersible motor as described in claim 7, characterized in that, The bearing is provided with a first-stage mechanical seal on its outer side. The first-stage mechanical seal, together with the pump cover and the pump body, forms a water-sealed cavity. Fluid inside the pump body enters the water-sealed cavity but does not directly contact the bearing.

9. The optimized cooling structure for a dry-mounted submersible motor as described in claim 8, characterized in that, The pump cover is provided with an oil filling port, and a second-stage mechanical seal is provided on the outside of the bearing. The second-stage mechanical seal, the connecting seat, and the pump cover form an oil-sealed lubrication chamber. The oil filling port is in fluid communication with the oil-sealed lubrication chamber, and lubricating oil enters the oil-sealed lubrication chamber from the oil filling port.

10. The optimized cooling structure for a dry-mounted submersible motor as described in claim 9, characterized in that, The connecting seat is provided with a water outlet, and the pump cover is provided with a drain outlet. When the first-stage mechanical seal and the second-stage mechanical seal fail, the fluid in the pump body cavity enters the water-sealed cavity and then enters the oil-sealed lubrication cavity. Subsequently, it enters the leakage detection cavity through the water outlet and is finally discharged through the drain outlet.

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