Small-bore high-lift submersible pump motor

Abstract

The application relates to the field of motor heat dissipation technology, in particular to a small-bore high-lift submersible pump motor, which comprises a motor shell, a plurality of permanent magnets are arranged on the inner side wall of the motor shell, an upper end cover and a lower end cover are coaxially and threadedly connected to the upper and lower sides of the motor shell respectively, a rotor is coaxially arranged in the motor shell, and the rotor is rotationally connected with the upper end cover and the lower end cover; a plurality of heat dissipation columns are arranged on the motor shell, each heat dissipation column is located between two adjacent permanent magnets, the heat dissipation columns can directly contact the heat generated in the motor, the heat dissipation efficiency is effectively improved, liquid channels are arranged in the heat dissipation columns, pump blades are arranged in the mounting cavities, when the motor operates, the pump blades rotate with the rotor, well water in the mounting cavities is sucked into the liquid channels of the heat dissipation columns through the liquid inlet holes, the well water absorbs the heat generated by the motor during the flowing process in the channels, and then is discharged to the outside of the motor shell through the liquid outlet holes, so that the heat is effectively transferred and dissipated.

Description

Technical Field

[0001] This invention relates to the field of motor heat dissipation technology, specifically to a small-diameter, high-lift submersible pump motor. Background Technology

[0002] A deep well submersible pump is a water-lifting device that integrates a motor and a pump, both submerged in water. Its core components are the submersible pump motor and the pump body module. The reliability, lifespan, and performance of the submersible pump motor directly determine the stability of the entire pump system. Due to well diameter limitations, submersible pump motors are typically designed with a slender structure, making heat dissipation a particularly prominent issue. Unlike ordinary air-cooled motors, the heat generated by a submersible pump motor is entirely dissipated through the cooling effect of the water medium surrounding the motor.

[0003] Currently, most mainstream small-diameter deep well submersible pump motors employ a forced-cooling solution using well water. Specifically, an annular slit channel is formed between the motor casing and the inner wall of the well pipe. During motor operation, a portion of the pumped well water is drawn in from below the pump body, flows through this annular channel, and carries away the heat generated by the motor through convective heat transfer, eventually merging into the main water flow and being discharged outside the well. However, this traditional solution relying on external forced-cooling using well water has the following inherent drawbacks, especially in applications with small diameters and high lift, where the problems are even more severe: the small diameter limits the diameter of the submersible pump motor, requiring an increase in motor length to achieve the required power. This slender structure results in a much higher heat load per unit surface area compared to a shorter, thicker motor, leading to a severely insufficient heat dissipation area. Heat is concentrated in the windings and core in the middle of the motor, creating an axial temperature gradient, with the middle becoming the highest temperature point, making it difficult to efficiently conduct heat radially to the casing and have it carried away by the water flow.

[0004] Therefore, the cooling systems of existing small-diameter, high-lift submersible pump motors suffer from low cooling efficiency due to limitations in reliability caused by their physical structure. This severely restricts the reliability and service life of submersible pump motors under harsh operating conditions. The aim is to address the limitations of traditional submersible pump motor cooling methods. Summary of the Invention

[0005] The purpose of this invention is to provide a small-diameter, high-lift submersible pump motor to solve the problem that the heat dissipation efficiency of a high-lift submersible pump motor is reduced due to the limitation of motor diameter, the need to lengthen the motor, and the insufficient heat dissipation area of ​​a slender submersible pump motor.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A small-diameter, high-lift submersible pump motor includes a motor housing. Multiple permanent magnets are mounted on the inner wall of the motor housing. An upper end cover and a lower end cover are coaxially threaded to the upper and lower sides of the motor housing, respectively. A rotor is coaxially disposed inside the motor housing and rotatably connected to the upper and lower end covers. A sealing cover is coaxially disposed on the lower end face of the lower end cover. The upper end of the rotor extends to the upper side of the upper end cover, and the lower end of the rotor extends between the lower end cover and the sealing cover. Furthermore, the side wall of the motor housing has mounting slots equal in number to the permanent magnets, with each mounting slot located at two... Between adjacent permanent magnets, the mounting groove penetrates the inner and outer sides of the motor housing. A heat dissipation column is provided in the mounting groove, and a liquid channel that does not penetrate the upper and lower ends is provided in the heat dissipation column. A mounting cover is coaxially provided on the lower end face of the cover. A mounting cavity is provided between the mounting cover and the cover. A pump blade is coaxially provided in the mounting cavity. The pump blade is fixedly connected to the lower end of the rotor. A liquid inlet hole is provided on the lower end face of the heat dissipation column. The mounting cavity and the liquid channel are connected through the liquid inlet hole. A drain hole is provided on the upper outer wall of the heat dissipation column. The liquid channel is connected to the outer side of the motor housing through the drain hole.

[0008] By incorporating multiple heat dissipation columns on the motor housing, with each column positioned between two adjacent permanent magnets, this layout not only fully utilizes the space on the sidewalls of the motor housing but also allows the heat dissipation columns to directly contact the heat generated inside the motor, thereby effectively improving heat dissipation efficiency. The liquid channels within the heat dissipation columns, which do not penetrate both ends, work in conjunction with the pump impellers within the mounting cavity to form a unique internal circulating cooling system. When the motor is running, the pump impellers rotate with the rotor, drawing well water from the mounting cavity into the liquid channels of the heat dissipation columns through the inlet holes. As the well water flows within these channels, it absorbs the heat generated by the motor and is then discharged to the outside of the motor housing through the drain holes, achieving effective heat transfer and dissipation.

[0009] Furthermore, all the heat dissipation columns are detachably connected to the motor housing, which facilitates the maintenance and replacement of the heat dissipation columns. In practical applications, if a heat dissipation column is damaged or its performance degrades due to long-term use or unexpected circumstances, the staff does not need to disassemble the entire motor housing. They can simply remove the damaged heat dissipation column from the motor housing and install a new one, greatly shortening maintenance time and reducing maintenance costs. At the same time, the detachable connection between the heat dissipation columns and the motor housing also facilitates the upgrading and modification of the heat dissipation columns. When a heat dissipation column with better performance and heat dissipation effect becomes available, the original heat dissipation column can be easily replaced to improve the overall heat dissipation performance of the submersible pump motor. Moreover, the detachable connection structure between the heat dissipation columns and the motor housing also provides a certain degree of flexibility in the manufacturing process. The specifications, materials, and other parameters of the heat dissipation columns can be flexibly adjusted according to different production needs and usage scenarios to meet diverse market demands.

[0010] Preferably, the heat dissipation column includes a primary heat-conducting section and a secondary heat-conducting section. The primary heat-conducting section is fixedly connected to the motor housing, and the secondary heat-conducting section is embedded between two adjacent permanent magnets. The primary heat-conducting section and the secondary heat-conducting section are connected, and their cross-sectional projection is "T"-shaped. The inner wall of the primary heat-conducting section extends to 1 / 3 of the arc surface of the outer wall of the two permanent magnets. The outer wall of the primary heat-conducting section has the same diameter as the outer wall of the motor housing. The inner wall of the secondary heat-conducting section has the same diameter as the inner wall of the permanent magnet. The liquid channel extends into the primary heat-conducting section and the secondary heat-conducting section.

[0011] By designing the heat dissipation column as a primary heat-conducting section and a secondary heat-conducting section, the structure of the heat dissipation column is made to better fit the thermal field distribution inside the motor. The primary heat-conducting section covers part of the outer area of ​​the permanent magnet, which can quickly absorb the heat generated by the permanent magnet, while ensuring the structural strength of the motor housing. The secondary heat-conducting section is embedded between two adjacent permanent magnets, which can directly contact and conduct the heat dissipated by the permanent magnet. The "T"-shaped cross-sectional projection design of the primary and secondary heat-conducting sections increases the contact area between the heat dissipation column and the heat source inside the motor, effectively improving the heat conduction efficiency from the heat source to the heat dissipation column, and further improving the overall heat dissipation effect.

[0012] The inner wall of the primary heating element extends to one-third of the outer arc surface of the permanent magnets on both sides, ensuring a large contact area between the primary heating element and the outside of the motor housing. This facilitates the rapid transfer of heat from inside the submersible pump motor to the outside of the motor housing, while also enabling efficient heat dissipation through the contact between the motor housing and the external water medium. The design that the outer wall of the primary heating element has the same diameter as the outer wall of the motor housing ensures a better fit between the heat dissipation column and the overall structure of the motor housing, enhancing the stability and sealing of the motor structure and preventing external water medium from seeping into the motor and causing damage. Meanwhile, the inner wall of the secondary heating element has the same diameter as the inner wall of the permanent magnet, ensuring that the secondary heating element can fit tightly against the permanent magnet, maximizing the absorption of heat generated by the permanent magnet and reducing heat conduction losses between the permanent magnet and the heat dissipation column.

[0013] Furthermore, the liquid channel extends into the main and secondary heat-conducting sections, allowing the well water to fully absorb the heat absorbed by different parts of the heat dissipation column during its flow, forming a more efficient heat transfer path. This effectively solves the problem of insufficient heat dissipation area and low heat dissipation efficiency caused by the slender structure of small-diameter, high-lift submersible pump motors, greatly improving the reliability and service life of submersible pump motors under harsh operating conditions.

[0014] Preferably, the liquid channel is provided with two partition plates, which are located in the main temperature section and divide the liquid channel into two No. 1 channels and one No. 2 channel.

[0015] By installing two partitions within the liquid channel, dividing it into two No. 1 channels and one No. 2 channel, this design not only optimizes the flow path of the well water but also significantly improves heat dissipation efficiency. Specifically, the partitions allow the well water to flow more orderly as it passes through the heat dissipation column, avoiding disordered mixing and eddies within the channels. This reduces energy loss and flow resistance, resulting in more complete and efficient flow of the well water within the heat dissipation column, thus effectively improving the overall heat dissipation performance of the submersible pump motor. Furthermore, the partitions increase the structural strength of the heat dissipation column, enhancing its resistance to vibration and impact, enabling it to maintain stable heat dissipation performance even in harsh working environments.

[0016] Preferably, the inner wall of the secondary temperature-conducting part is provided with a third temperature-conducting part, which is located between the outer wall of the permanent magnet and the rotor. The cross-section formed by the primary temperature-conducting part, the secondary temperature-conducting part, and the third temperature-conducting part is I-shaped. The outer wall of the third temperature-conducting part extends to 1 / 3 of the arc surface of the inner wall of the two permanent magnets. The outer wall of the third temperature-conducting part has the same diameter as the inner wall of the permanent magnet.

[0017] By setting a third heat-conducting section on the inner wall of the secondary heat-conducting section, the contact effect between the heat dissipation column and the internal heat source of the motor is further enhanced. The third heat-conducting section is located between the outer wall of the permanent magnet and the rotor, allowing it to directly absorb the heat generated during stator operation. Simultaneously, it forms a superimposed effect with the heat dissipated by the permanent magnet, both being absorbed by the heat dissipation column and conducted to the outside of the motor housing. Furthermore, the "I"-shaped cross-section design of the heat dissipation column not only increases the contact area between the heat dissipation column and the heat source but also makes the heat conduction path more rational, resulting in smoother heat conduction from the heat source to the heat dissipation column and effectively improving heat dissipation efficiency. The outer wall of the third heat-conducting section extends to 1 / 3 of the arc surface of the inner wall of the two permanent magnets, and its diameter is the same as that of the inner wall of the permanent magnets. This design ensures that the third heat-conducting section can closely fit the permanent magnet and the stator, maximizing the absorption of the heat generated by them and reducing heat loss during conduction. This further improves the heat dissipation performance of the submersible pump motor and ensures the stability and reliability of the motor under high load and long-term operation.

[0018] Preferably, the motor housing is provided with finned plates of the same number as the permanent magnets. The upper and lower sides of the finned plates are fixedly connected to the motor housing by bolts. Multiple finned plates are evenly distributed in a circumferential array along the axis of the motor housing, and the drain holes penetrate through the finned plates.

[0019] By installing finned plates on the outside of the motor housing, the heat dissipation area of ​​the motor is further expanded. The finned plates are evenly distributed in a circumferential array along the motor housing axis, allowing heat to be conducted more evenly from the motor housing to the surrounding environment, avoiding localized overheating. The upper and lower sides of the finned plates are fixed to the motor housing with bolts, ensuring close contact between the finned plates and the motor housing, which is beneficial for heat conduction, and also facilitating the installation, disassembly, and replacement of the finned plates. In practical applications, if a finned plate is damaged or deformed due to long-term use or external factors, it can be easily replaced without disassembling the entire motor, reducing maintenance costs and time. Furthermore, the number of finned plates is the same as the number of permanent magnets. This corresponding design makes the heat dissipation system more regular and orderly, which is conducive to optimizing the overall heat dissipation performance. Moreover, the material of the finned plates can be selected according to actual needs. For example, using metal materials with good thermal conductivity can further improve heat conduction efficiency, thereby improving the heat dissipation performance of the entire submersible pump motor and ensuring stable operation of the motor under various operating conditions.

[0020] Preferably, each of the finned plates has a thermally conductive layer on its inner sidewall. The thermally conductive layer is made of any material including graphene, conductive silicon, or pure copper. The inner and outer sides of the thermally conductive layer are respectively attached to the motor housing and the finned plate.

[0021] By incorporating a thermally conductive layer on the inner wall of the finned plate, the efficiency of heat transfer from the motor housing to the finned plate is further enhanced. The materials used in the thermally conductive layer, such as graphene, conductive silicon, or pure copper, all possess excellent thermal conductivity, enabling them to rapidly transfer heat from the motor housing to the finned plate, thereby accelerating heat dissipation. Graphene, with its extremely high thermal conductivity and excellent mechanical properties, is an ideal choice for the thermally conductive layer. It can form efficient heat conduction paths at the microscopic level, ensuring rapid and uniform heat distribution across the entire finned plate. Conductive silicon, with its good flexibility and adhesion, adheres tightly to the motor housing and finned plate, reducing thermal resistance and improving heat transfer efficiency. Pure copper, as a traditional thermally conductive material, plays a crucial role in the thermally conductive layer due to its high thermal conductivity and stability. The selection of these materials not only improves the heat dissipation performance of the submersible pump motor but also extends its service life, allowing it to maintain stable operation even in harsh working environments.

[0022] Preferably, the heat dissipation column is made of silicon steel, and the distance between the inner wall of the third heat-conducting part and the outer wall of the rotor is between 0.3 and 0.5 mm.

[0023] By using silicon steel to make the heat dissipation column, the excellent magnetic and thermal conductivity of silicon steel can not only effectively reduce hysteresis loss during motor operation and reduce motor energy consumption, but also quickly conduct heat generated inside the motor to improve heat dissipation efficiency. At the same time, silicon steel has high strength and hardness, which can ensure that the heat dissipation column can withstand various stresses during motor operation without deformation or damage, ensuring that the heat dissipation column can play a stable role in heat dissipation for a long time.

[0024] Furthermore, controlling the distance between the inner wall of the No. 3 heat-conducting section and the outer wall of the rotor to be between 0.3 and 0.5 mm ensures that a good heat conduction channel is formed between the No. 3 heat-conducting section and the stator, so that the heat generated by the stator during operation can be efficiently transferred to the No. 3 heat-conducting section, and then conducted to the outside of the motor housing through the heat dissipation column. If the distance is too large, the heat loss during the transfer process will increase, reducing the heat dissipation efficiency; if the distance is too small, the No. 3 heat-conducting section may rub against the stator due to vibration or other reasons during motor operation, affecting the normal operation of the motor, or even damaging motor components.

[0025] Preferably, the inner wall of the third temperature-conducting part is provided with multiple temperature-conducting grooves, the vertical projection of the multiple temperature-conducting grooves is arc-shaped, and the multiple temperature-conducting grooves are evenly distributed at equal intervals along the axial direction of the motor housing.

[0026] By setting multiple heat-conducting grooves on the inner wall of the No. 3 heat-conducting section, with the vertical projection of the grooves being arc-shaped and evenly distributed along the motor housing axis, the arc-shaped structure of the grooves increases the surface area of ​​the No. 3 heat-conducting section, improving the heat exchange efficiency between the No. 3 heat-conducting section and the well water, thereby further enhancing the overall heat dissipation performance of the submersible pump motor. Simultaneously, the evenly distributed heat-conducting grooves form multiple heat conduction channels, helping to evenly distribute heat within the No. 3 heat-conducting section and preventing localized heat accumulation. The arc-shaped vertical projection of the heat-conducting grooves also helps to stabilize the airflow generated by the rotor rotation during operation, improving the stability and reliability of the heat dissipation system. This ensures that the submersible pump motor maintains a stable temperature even under long-term, high-load operation, extending the motor's service life.

[0027] Preferably, the lower end of the mounting cover is provided with a filter screen, and the mesh size of the filter screen is in the range of 100 to 120 mesh.

[0028] By installing a filter screen at the lower end of the mounting cover, with the mesh size controlled between 100 and 120 mesh, external impurities and particles are effectively prevented from entering the mounting cavity and the liquid channel of the heat dissipation column. During the operation of the submersible pump motor, well water in the mounting cavity is drawn into the liquid channel of the heat dissipation column through the inlet hole and then discharged to the outside of the motor housing through the outlet hole, forming a circulating cooling system. If impurities are mixed in the well water, they will not only block the liquid channel and affect the flow efficiency of the well water, but may also cause wear on components such as the heat dissipation column and pump blades, reducing heat dissipation performance or even causing malfunctions. The 100-120 mesh filter screen can finely filter the well water, ensuring the cleanliness of the well water entering the circulation system, which not only ensures the smooth flow of well water, but also extends the service life of the internal components of the motor. At the same time, the filter screen in this mesh size range achieves a good balance between filtration effect and fluid resistance. It will not cause an increase in fluid resistance and affect the well water circulation efficiency due to excessive mesh size, nor will it fail to effectively filter impurities due to insufficient mesh size, thus ensuring the stable and efficient operation of the submersible pump motor heat dissipation system.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] 1. This invention improves heat dissipation efficiency by setting multiple heat dissipation columns on the motor housing, with each column located between two adjacent permanent magnets. This allows the heat dissipation columns to directly contact the heat generated inside the motor. Furthermore, a liquid channel is set inside the heat dissipation column, which works in conjunction with the pump blades in the mounting cavity. When the motor is running, the pump blades rotate with the rotor, drawing well water from the mounting cavity into the liquid channel of the heat dissipation column through the inlet hole. As the well water flows through the channel, it absorbs the heat generated by the motor and is then discharged to the outside of the motor housing through the drain hole. This achieves effective heat transfer and dissipation.

[0031] 2. By designing the heat dissipation column into an "I"-shaped structure with a primary heat-conducting section, a secondary heat-conducting section, and a third heat-conducting section, this invention not only increases the contact area between the heat dissipation column and the heat source, but also makes the heat conduction path more reasonable and the conduction process from the heat source to the heat dissipation column smoother, effectively improving the heat dissipation efficiency and further enhancing the heat dissipation performance of the submersible pump motor, ensuring the stability and reliability of the motor under high load and long-term operation.

[0032] 3. This invention divides the liquid channel into two No. 1 channels and one No. 2 channel by setting two partition plates in the liquid channel. This allows the well water to flow more orderly when passing through the heat dissipation column, avoiding disordered mixing and eddy currents in the channel. This reduces energy loss and flow resistance, making the flow of well water in the heat dissipation column more complete and efficient, thereby effectively improving the overall heat dissipation performance of the submersible pump motor. Attached Figure Description

[0033] Figure 1This is a schematic diagram of the overall structure of the small-diameter high-lift submersible pump of the present invention;

[0034] Figure 2 This is a full sectional view of the small-diameter, high-lift submersible pump of the present invention.

[0035] Figure 3 This is a schematic diagram of the structure of the small-diameter, high-lift submersible pump motor of the present invention.

[0036] Figure 4 for Figure 2 A magnified view of a section at point B in the middle;

[0037] Figure 5 for Figure 2 Full sectional view at point AA;

[0038] Figure 6 for Figure 5 A magnified view of a section at point C;

[0039] Figure 7 for Figure 5 Full sectional view at point DD;

[0040] Figure 8 for Figure 7 A magnified view of a section at point E in the middle.

[0041] In the diagram: 1. Motor section; 2. Pump body section; 3. Motor housing; 301. Mounting groove; 4. Permanent magnet; 5. Rotor; 6. Upper end cover; 7. Lower end cover; 8. Sealing cover; 9. Heat dissipation column; 901. Liquid channel; 902. Liquid inlet; 903. Liquid outlet; 904. Main heat conduction section; 905. Secondary heat conduction section; 906. No. 3 heat conduction section; 907. Partition plate; 908. Channel 1; 909. Channel 2; 910. Heat conduction groove; 10. Mounting cover; 1001. Mounting cavity; 11. Pump impeller; 12. Finned plate; 13. Heat conduction layer; 14. Filter screen. Detailed Implementation

[0042] Please see Figures 1 to 8 This invention provides a small-diameter, high-lift submersible pump motor, the technical solution of which is as follows:

[0043] Please refer to the following: A small-diameter, high-lift submersible pump motor. Figures 1 to 3 , Figures 7 to 8The motor housing 3 includes a motor housing 3. Multiple permanent magnets 4 are mounted on the inner wall of the motor housing 3. An upper end cover 6 and a lower end cover 7 are coaxially threaded to the upper and lower sides of the motor housing 3, respectively. A rotor 5 is coaxially mounted inside the motor housing 3, and the rotor 5 is rotatably connected to the upper end cover 6 and the lower end cover 7. A sealing cover 8 is coaxially mounted on the lower end surface of the lower end cover 7. The upper end of the rotor 5 extends to the upper side of the upper end cover 6, and the lower end of the rotor 5 extends between the lower end cover 7 and the sealing cover 8. The side wall of the motor housing 3 has mounting slots 301, the same number as the permanent magnets 4. Each mounting slot 301 is located between two adjacent permanent magnets 4. The mounting slots 301 penetrate the inner and outer sides of the motor housing 3. A heat dissipation column 9, made of silicon steel, is installed inside the mounting slot 301. The heat dissipation column 9 has a liquid channel 901 that does not penetrate the upper and lower ends. Two partition plates 907 are provided inside the channel 901. The two partition plates 907 are located inside the main temperature section 904 and divide the liquid channel 901 into two No. 1 channels 908 and one No. 2 channel 909. A mounting cover 10 is coaxially provided on the lower end face of the cover 8. A mounting cavity 1001 is provided between the mounting cover 10 and the cover 8. A filter screen 14 is provided at the lower end of the mounting cover 10. The mesh size of the filter screen 14 is 120 mesh. A pump blade 11 is coaxially provided inside the mounting cavity 1001. The pump blade 11 is fixedly connected to the lower end of the rotor 5. A liquid inlet hole 902 is provided on the lower end face of the heat dissipation column 9. The mounting cavity 1001 is connected to the liquid channel 901 through the liquid inlet hole 902. A drain hole 903 is provided on the upper outer wall of the heat dissipation column 9. The liquid channel 901 is connected to the outer side of the motor housing 3 through the drain hole 903. The motor housing 3 is provided with the same number of finned plates 12 as the permanent magnet 4. The upper and lower sides of the finned plates 12 are fixedly connected to the motor housing 3 by bolts. Multiple finned plates 12 are evenly distributed in a circumferential array along the axis of the motor housing 3. The drain hole 903 penetrates the finned plates 12. Each finned plate 12 has a heat-conducting layer 13 on its inner sidewall. The heat-conducting layer 13 is made of graphene material. The inner and outer sides of the heat-conducting layer 13 are respectively attached to the motor housing 3 and the finned plates 12.

[0044] Please see Figure 2 , Figure 5 and Figure 6The heat dissipation column 9 includes a primary heat-conducting section 904 and a secondary heat-conducting section 905. The primary heat-conducting section 904 is fixedly connected to the motor housing 3, and the secondary heat-conducting section 905 is embedded between two adjacent permanent magnets 4. The primary heat-conducting section 904 and the secondary heat-conducting section 905 are connected, and their cross-sectional projection is "T"-shaped. The inner wall of the primary heat-conducting section 904 extends to one-third of the arc surface of the outer wall of the two permanent magnets 4. The outer wall of the primary heat-conducting section 904 has the same diameter as the outer wall of the motor housing 3. The inner wall of the secondary heat-conducting section 905 has the same diameter as the inner wall of the permanent magnet 4. The liquid channel 901 extends into the primary heat-conducting section 904 and the secondary heat-conducting section 905. The inner wall of the secondary heat-conducting section 905 is provided with a third heat-conducting section 906. The third temperature-conducting part 906 is located between the outer wall of the permanent magnet 4 and the rotor 5. The cross-section formed by the main temperature-conducting part 904, the auxiliary temperature-conducting part 905 and the third temperature-conducting part is I-shaped. The outer wall of the third temperature-conducting part 906 extends to 1 / 3 of the arc surface of the inner wall of the two permanent magnets 4. The outer wall of the third temperature-conducting part 906 has the same diameter as the inner wall of the permanent magnet 4. The distance between the inner wall of the third temperature-conducting part 906 and the outer wall of the rotor 5 is between 0.3 and 0.5 mm. Multiple temperature-conducting grooves 910 are provided on the inner wall of the third temperature-conducting part 906. The vertical projection of the multiple temperature-conducting grooves 910 is arc-shaped, and the multiple temperature-conducting grooves 910 are evenly distributed along the axial direction of the motor housing 3.

[0045] It should also be noted that the small-diameter, high-lift submersible pump in this embodiment is used for well-washing sampling in the field of groundwater environmental monitoring. The inner diameter of the small-diameter deep monitoring well is 60mm, and the depth is 70m. Please refer to [link / reference]. Figure 1 and Figure 2 The small-diameter high-lift submersible pump consists of a motor section 1 and a pump body section 2. The motor section 1 and the pump body section 2 are connected by threads. The rotor 5 is fixedly connected to the impeller assembly inside the pump body section 2 by a coupling. The rotor 5 and the impeller assembly inside the pump body section 2 rotate coaxially. The maximum outer diameter of the small-diameter high-lift submersible pump is 45mm, the length is 380mm, the maximum speed of the submersible pump motor is 15000R / min, the maximum torque is 1.8N*m, the maximum power is 1100W, the number of impeller assemblies in the pump body section 2 is 6, the maximum head is 110~120m, and the maximum flow rate is 26L / min.

[0046] Working principle: When the motor of the small-diameter, high-lift submersible pump is started, the motor section 1 begins to operate, and the rotor 5 rotates under electromagnetic drive. Since the rotor 5 is fixedly connected to the impeller assembly in the pump body section 2 through a coupling and rotates coaxially, the rotational force of the rotor 5 is directly transmitted to the impeller assembly, causing the impeller assembly to also start rotating at high speed. A negative pressure is generated in the pump body section 2, and well water enters the pump body section 2 and is pumped to the outside of the well. At the same time, the pump blades 11 in the mounting cavity 1001 rotate with the rotor 5, generating a negative pressure on the lower side of the pump body in the mounting cavity 1001 and a positive pressure on the upper side of the pump body in the mounting cavity 1001. This draws the well water in the mounting cavity 1001 into the liquid channel 901 of the heat dissipation column 9 through the liquid inlet 902 on the lower end face of the heat dissipation column 9.

[0047] After the well water enters the liquid channel 901, it flows within the liquid channel 901. Because the liquid channel 901 is equipped with two partition plates 907, the channel is divided into two No. 1 channels 908 and one No. 2 channel 909. The well water flows in an orderly manner according to the predetermined path, avoiding disordered mixing and eddy currents, and reducing energy loss and flow resistance. During the flow, the well water continuously absorbs the heat generated inside the motor, especially from the main heat conduction section 904, the secondary heat conduction section 905, and the third heat conduction section 906. The third heat conduction section 906 is located between the outer wall of the permanent magnet 4 and the rotor 5. The multiple heat conduction grooves 910 on the inner wall of the third heat conduction section 906 increase the surface area and improve the heat exchange efficiency between the hot air and the well water between the stator and the permanent magnet 4. At the same time, the equidistantly distributed heat conduction grooves 910 form multiple heat conduction channels, which helps to distribute heat evenly.

[0048] As the well water absorbs heat, its temperature gradually increases. When the well water flows to the drain hole 903 on the outer side wall of the heat dissipation column 9, the high-temperature well water is discharged to the outside of the motor housing 3 through the drain hole 903. At this time, the finned plates 12 evenly distributed in the outer circumference array of the motor housing 3 play a role. The heat-conducting layer 13 on the finned plate 12 has good thermal conductivity, which quickly conducts the heat on the motor housing 3 and the heat in the high-temperature well water discharged from the drain hole 903 to the finned plate 12. The finned plate 12 dissipates the heat to the surrounding environment through well water convection, realizing the effective transfer and dissipation of heat.

[0049] Meanwhile, the filter screen 14 at the lower end of the mounting cover 10 effectively prevents external impurities and particles from entering the mounting cavity 1001 and the liquid channel 901 of the heat dissipation column 9, ensuring the cleanliness of the well water, ensuring the smooth flow of the well water, and avoiding the problem of affecting the flow efficiency and heat dissipation performance of the well water due to impurities clogging the liquid channel 901.

[0050] When small-diameter, high-lift submersible pumps are used for well-washing sampling in the field of groundwater environmental monitoring, the motor unit 1 and the pump body unit 2 work together. The rotor 5 drives the impeller assembly to rotate at high speed, generating strong suction and head to extract groundwater from deep monitoring wells. The heat generated by the motor during operation is dissipated in a timely manner through the aforementioned heat dissipation system, ensuring the stability and reliability of the motor under high load and long-term operation, thus achieving the purpose of well-washing sampling.

[0051] The specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.

Claims

1. A small-diameter, high-lift submersible pump motor, comprising a motor housing (3), wherein a plurality of permanent magnets (4) are provided on the inner wall of the motor housing (3), an upper end cover (6) and a lower end cover (7) are coaxially threaded to the upper and lower sides of the motor housing (3), a rotor (5) is coaxially disposed inside the motor housing (3), the rotor (5) is rotatably connected to the upper end cover (6) and the lower end cover (7), a sealing cover (8) is coaxially disposed on the lower end surface of the lower end cover (7), the upper end of the rotor (5) extends to the upper side of the upper end cover (6), and the lower end of the rotor (5) extends between the lower end cover (7) and the sealing cover (8), characterized in that, The motor housing (3) has mounting slots (301) on its side wall, the same number as the permanent magnets (4). Each mounting slot (301) is located between two adjacent permanent magnets (4). The mounting slots (301) penetrate the inner and outer sides of the motor housing (3). A heat dissipation column (9) is provided in the mounting slot (301). A liquid channel (901) that does not penetrate the upper and lower ends is provided in the heat dissipation column (9). A mounting cover (10) is coaxially provided on the lower end face of the cover (8). The mounting cover (10) and the cover (8) are connected. An installation cavity (1001) is provided between the two parts. A pump blade (11) is coaxially provided in the installation cavity (1001). The pump blade (11) is fixedly connected to the lower end of the rotor (5). A liquid inlet hole (902) is provided on the lower end face of the heat dissipation column (9). The installation cavity (1001) and the liquid channel (901) are connected through the liquid inlet hole (902). A drain hole (903) is provided on the upper outer side wall of the heat dissipation column (9). The liquid channel (901) is connected to the outer side of the motor housing (3) through the drain hole (903). The heat dissipation column (9) includes a primary heat-conducting section (904) and a secondary heat-conducting section (905). The primary heat-conducting section (904) is fixedly connected to the motor housing (3). The secondary heat-conducting section (905) is embedded between two adjacent permanent magnets (4). The primary heat-conducting section (904) and the secondary heat-conducting section (905) are connected and have a T-shaped cross-section projection. The inner wall of the primary heat-conducting section (904) extends to 1 / 3 of the arc surface of the outer wall of the two permanent magnets (4). The outer wall of the primary heat-conducting section (904) has the same diameter as the outer wall of the motor housing (3). The inner wall of the secondary heat-conducting section (905) has the same diameter as the inner wall of the permanent magnet (4). The liquid channel (901) extends into the primary heat-conducting section (904) and the secondary heat-conducting section (905). The liquid channel (901) is provided with two partition plates (907), which are located in the main temperature section (904) and divide the liquid channel (901) into two No. 1 channels (908) and one No. 2 channel (909). The inner wall of the secondary temperature-conducting part (905) is provided with a third temperature-conducting part (906). The third temperature-conducting part (906) is located between the outer wall of the permanent magnet (4) and the rotor (5). The cross-section formed by the main temperature-conducting part (904), the secondary temperature-conducting part (905) and the third temperature-conducting part is I-shaped. The outer wall of the third temperature-conducting part (906) extends to 1 / 3 arc surface of the inner wall of the two permanent magnets (4). The outer wall of the third temperature-conducting part (906) has the same diameter as the inner wall of the permanent magnet (4).

2. The submersible pump motor with small diameter and high head according to claim 1, characterized in that, The motor housing (3) is provided with the same number of finned plates (12) as the permanent magnet (4). The upper and lower sides of the finned plates (12) are fixedly connected to the motor housing (3) by bolts. Multiple finned plates (12) are evenly distributed in a circumferential array along the axis of the motor housing (3). The drain hole (903) penetrates the finned plates (12).

3. The submersible pump motor with small diameter and high head according to claim 2, characterized in that, Each of the finned plates (12) has a thermally conductive layer (13) on its inner sidewall. The thermally conductive layer (13) is made of any material including graphene, conductive silicon or pure copper. The inner and outer sides of the thermally conductive layer (13) are respectively attached to the motor housing (3) and the finned plate (12).

4. The submersible pump motor with small diameter and high head according to claim 1, characterized in that, The heat dissipation column (9) is made of silicon steel, and the distance between the inner wall of the third heat-conducting part (906) and the outer wall of the rotor (5) is between 0.3 and 0.5 mm.

5. A small-diameter, high-lift submersible pump motor according to claim 4, characterized in that, The inner wall of the third temperature-conducting part (906) is provided with multiple temperature-conducting grooves (910). The vertical projection of the multiple temperature-conducting grooves (910) is arc-shaped, and the multiple temperature-conducting grooves (910) are evenly distributed at equal intervals along the axial direction of the motor housing (3).

6. The submersible pump motor with small diameter and high head according to claim 1, characterized in that, The lower end of the mounting cover (10) is provided with a filter screen (14), and the mesh size of the filter screen (14) is in the range of 100 to 120 mesh.

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