Submersible permanent magnet motor for bidirectional cross-flow pump

Abstract

The utility model discloses a kind of diving permanent-magnet motor for bidirectional through-flow pump, it is related to municipal water supply technical field.The device includes permanent-magnet motor main body, flow cover assembly and support footboard, the permanent-magnet motor main body is connected in the flow cover assembly inside, the output shaft of the permanent-magnet motor main body is stretched out the flow cover assembly and is connected with rotating impeller.This diving permanent-magnet motor for bidirectional through-flow pump is by using permanent-magnet motor main body, power factor and operating efficiency are greatly improved, while internal structure layout is simplified, multiple flow cavities opened on flow cover assembly can make external liquid directly flow through the outer surface of permanent-magnet motor main body, realize the direct rapid conduction of heat, discard the heat dissipation path lengthening problem brought by traditional sealed box, compared with sealed structure temperature control effect is significantly improved, effectively break through the restriction of low heat dissipation efficiency to system overall performance.

Description

Technical Field

[0001] This utility model relates to the field of municipal water supply technology, and in particular to a submersible permanent magnet motor for a bidirectional axial flow pump. Background Technology

[0002] With the continuous development of the economy and society, energy conservation and environmental protection have become a common consensus, driving the iteration of various electrical equipment towards high efficiency, energy saving, compact structure, and safety and reliability. As key equipment in fields such as municipal water supply, the technological upgrading of large submersible motors is particularly crucial.

[0003] Currently, submersible motors used in municipal pumps mostly employ three-phase asynchronous motors, which suffer from low power factor, low operating efficiency, and large size, making it difficult to meet current requirements for energy conservation and compact installation. To improve energy efficiency and reduce size, the industry has gradually introduced permanent magnet motor technology. The structure proposed in Chinese patent CN212656997U is representative of this approach. This solution places the submersible motor body within a sealed enclosure, supplemented by heat dissipation components, forming a wet permanent magnet motor structure. This improves, to some extent, the shortcomings of traditional asynchronous motors, such as low power factor, insufficient efficiency, and large size. However, because this type of motor is entirely encapsulated within a sealed enclosure, the heat dissipation path is extended, reducing efficiency. Compared to heat dissipation methods where the motor directly contacts the water, its temperature control effect is poor, limiting the overall system performance. Furthermore, the overall structure is relatively complex, increasing manufacturing and maintenance costs. Utility Model Content

[0004] This invention provides a submersible permanent magnet motor for a bidirectional axial flow pump, which can solve the problems mentioned in the background art, such as extended heat dissipation path, reduced efficiency, poor temperature control, and restrictions on the overall performance of the system.

[0005] A submersible permanent magnet motor for a bidirectional axial flow pump includes a permanent magnet motor body, a flow shroud assembly, and a support foot plate. The permanent magnet motor body is connected inside the flow shroud assembly. The output shaft of the permanent magnet motor body extends out of the flow shroud assembly and is connected to a rotating impeller. The flow shroud assembly is connected to the support foot plate. A terminal box is provided on the flow shroud assembly. Multiple flow cavities are formed on the flow shroud assembly. The flow cavities are used to allow external liquid to flow through the outer surface of the permanent magnet motor body to remove heat.

[0006] The submersible permanent magnet motor for a bidirectional axial flow pump provided by this utility model has the following beneficial effects compared with the prior art: This submersible permanent magnet motor for bidirectional axial flow pumps significantly improves power factor and operating efficiency compared to traditional three-phase asynchronous motors used in municipal pumps by adopting a permanent magnet motor body. It also simplifies the internal structure layout. Multiple flow chambers on the flow shroud assembly allow external liquid to flow directly over the outer surface of the permanent magnet motor body, achieving direct and rapid heat transfer. This eliminates the problem of extended heat dissipation paths caused by traditional sealed enclosures, resulting in significantly improved temperature control compared to sealed structures. It effectively overcomes the limitation of low heat dissipation efficiency on overall system performance. The flow shroud assembly directly supports the motor body and integrates a junction box, along with support feet for stable assembly. No additional sealed enclosure or matching heat dissipation components are required. This not only greatly simplifies the overall structure and solves the problem of complex existing permanent magnet motor structures, but also significantly reduces the manufacturing difficulty and subsequent maintenance costs of the equipment.

[0007] Furthermore, the flow hood assembly includes an outer cover and multiple flow channel ribs. The outer cover is sleeved on the outside of the permanent magnet motor body. One end of the multiple flow channel ribs is connected to the inner surface of the outer cover, and the other end of the multiple flow channel ribs is connected to the outer surface of the permanent magnet motor body. The outer cover, the flow channel ribs, and the permanent magnet motor body together enclose and form a flow cavity.

[0008] Furthermore, the permanent magnet motor body includes a housing, a stator, and a rotating shaft. The stator is connected inside the housing, and the rotating shaft is disposed inside the stator. A rotor lamination is fixedly sleeved on the outer circumferential surface of the rotating shaft. A permanent magnet is embedded on the outer side of the rotor lamination, and a ventilation channel is provided through the rotor lamination along the axial direction.

[0009] Furthermore, a front cooling fan and a rear cooling fan are respectively provided at both ends of the rotating shaft, and both the front cooling fan and the rear cooling fan are connected to the rotating shaft by pins.

[0010] Furthermore, the output end of the shaft is provided with a spherical roller bearing and a deep groove ball bearing, while the non-output end of the shaft is provided with a cylindrical roller bearing.

[0011] Furthermore, a connecting plate is fixed inside the housing near the front cooling fan, and a speed sensor is detachably connected to the connecting plate, with the detection end of the speed sensor facing the rotating shaft.

[0012] Furthermore, a front cover is connected to one end of the housing, and a rear cover is connected to the other end of the housing. Both the front cover and the rear cover are provided with sealing rings inside.

[0013] Furthermore, two hanging plates are symmetrically arranged on the outside of the outer cover.

[0014] Furthermore, the outer surfaces of both the permanent magnet motor body and the shroud assembly are provided with multiple reinforcing ribs in the circumferential direction.

[0015] Furthermore, the spherical roller bearing, deep groove ball bearing, and cylindrical roller bearing are all provided with bearing retaining rings on their sides. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the permanent magnet motor according to an embodiment of the present invention; Figure 2 This is a front view of the permanent magnet motor according to an embodiment of the present invention; Figure 3 for Figure 1 A schematic diagram of the main structure of the permanent magnet motor; Figure 4 for Figure 3 Internal diagram of the main body of the permanent magnet motor Figure 1 ; Figure 5 for Figure 3 Internal diagram of the main body of the permanent magnet motor Figure 2 ; Figure 6 for Figure 5 Front view of the permanent magnet.

[0017] Explanation of reference numerals in the attached figures: 1. Permanent magnet motor body; 2. Flow hood assembly; 3. Support feet; 4. Terminal box; 5. Housing; 6. Stator; 7. Shaft; 8. Rotor laminations; 9. Permanent magnet; 10. Ventilation channel; 11. Front cooling fan; 12. Rear cooling fan; 13. Spherical roller bearing; 14. Deep groove ball bearing; 15. Cylindrical roller bearing; 16. Speed ​​sensor; 17. Front cover; 18. Rear cover; 19. Sealing ring; 20. Hanging plate; 21. Reinforcing rib; 22. Bearing retaining ring; 23. Connecting plate; 201. Outer cover; 202. Flow channel rib; 203. Flow cavity. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0023] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0024] like Figure 1-2 As shown, this utility model proposes a submersible permanent magnet motor for a bidirectional axial flow pump, including a permanent magnet motor body 1, a flow shroud assembly 2, and a support foot plate 3. The permanent magnet motor body 1 is connected inside the flow shroud assembly 2. The output shaft of the permanent magnet motor body 1 extends out of the flow shroud assembly 2 and is connected to a rotating impeller. The flow shroud assembly 2 is connected to the support foot plate 3. A terminal box 4 is provided on the flow shroud assembly 2. Multiple flow cavities 203 are formed on the flow shroud assembly 2. The flow cavities 203 are used to allow external liquid to flow through the outer surface of the permanent magnet motor body 1 to remove heat.

[0025] In this embodiment, by adopting a permanent magnet motor body 1, the power factor and operating efficiency are significantly improved compared to the traditional three-phase asynchronous motor used in municipal pumps. At the same time, the internal structural layout is simplified. The multiple flow chambers 203 opened on the flow cover assembly 2 allow external liquid to flow directly over the outer surface of the permanent magnet motor body 1, realizing direct and rapid heat conduction. This eliminates the problem of extended heat dissipation paths caused by traditional sealed enclosures. Compared with sealed structures, the temperature control effect is significantly improved, effectively overcoming the limitation of low heat dissipation efficiency on the overall system performance. The flow cover assembly 2 directly supports the installation of the permanent magnet motor body 1, and integrates the terminal box 4. Together with the support foot plate 3, it achieves stable overall assembly without the need for additional sealed enclosures and matching heat dissipation components. This not only greatly simplifies the overall structure and solves the defects of the complex structure of existing permanent magnet motors, but also significantly reduces the manufacturing difficulty and subsequent maintenance costs of the equipment.

[0026] Specifically, after the permanent magnet motor body 1 is powered on, it will drive the impeller to rotate, thereby actively generating a stable liquid flow. Driven by the impeller, the liquid flows smoothly through the multiple flow chambers 203 on the flow cover assembly 2 and over the outer surface of the permanent magnet motor body 1. The liquid flow enables real-time and efficient heat transfer, which is a heat dissipation mode that is actively formed by the operation of the motor.

[0027] like Figure 1 and Figure 2 As shown, the flow hood assembly 2 includes an outer cover 201 and multiple flow channel ribs 202. The outer cover 201 is sleeved on the outside of the permanent magnet motor body 1. One end of the multiple flow channel ribs 202 is connected to the inner surface of the outer cover 201, and the other end of the multiple flow channel ribs 202 is connected to the outer surface of the permanent magnet motor body 1. The outer cover 201, the flow channel ribs 202 and the permanent magnet motor body 1 together enclose and form a flow cavity 203.

[0028] In this embodiment, the outer casing 201 is fitted over the permanent magnet motor body 1, providing all-round protection for the permanent magnet motor body 1, preventing underwater impurities from directly corroding the motor surface and ensuring the safety of the motor's underwater operation. On the other hand, it provides a stable mounting base for the flow channel ribs 202. With the help of multiple flow channel ribs 202, the connection stability between the permanent magnet motor body 1 and the flow cover assembly 2 is greatly enhanced, improving the rigidity and vibration resistance of the overall structure and effectively reducing vibration noise during motor operation. At the same time, the flow cavity 203 formed by the outer casing 201, the flow channel ribs 202, and the permanent magnet motor body 1 together constructs a regular and unobstructed liquid flow channel. When the motor is powered on and drives the impeller to rotate, generating liquid flow, the liquid can flow evenly and comprehensively over the surface of the permanent magnet motor body 1 along the flow cavity 203, realizing rapid and efficient heat conduction of the motor body and significantly improving heat dissipation efficiency and temperature control effect.

[0029] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the permanent magnet motor body 1 includes a housing 5, a stator 6 and a rotating shaft 7. The stator 6 is connected inside the housing 5, and the rotating shaft 7 is located inside the stator 6. A rotor lamination 8 is fixedly sleeved on the outer circumferential surface of the rotating shaft 7. A permanent magnet 9 is embedded on the outer side of the rotor lamination 8, and a ventilation channel 10 is provided through the rotor lamination 8 along the axial direction.

[0030] In this embodiment, the rotor laminations 8 are fixedly sleeved on the outer circumferential surface of the shaft 7, providing a stable mounting carrier for the permanent magnet 9, ensuring that the permanent magnet 9 does not fall off during high-speed rotation, and improving the rotational balance of the shaft 7, reducing operating vibration. The structure of the stator 6 connected inside the housing 5 and the shaft 7 set inside the stator 6 ensures the stable operation of the motor's electromagnetic conversion and improves the smoothness of power output. The ventilation channels 10 that are axially penetrated on the rotor laminations 8 form an internal and external synergistic heat dissipation system with the flow cavity 203 of the external flow shroud assembly 2. When the motor is running, the internal airflow can flow quickly along the ventilation channels 10, carrying away the heat generated by the rotor. Combined with the heat dissipation method of external liquid flowing through the surface of the housing 5, dual high-efficiency heat dissipation is achieved, significantly improving the temperature control effect and avoiding the limitation of system performance due to high temperature.

[0031] like Figure 4 and Figure 5 As shown, a front cooling fan 11 and a rear cooling fan 12 are respectively provided at both ends of the rotating shaft 7. Both the front cooling fan 11 and the rear cooling fan 12 are connected to the rotating shaft 7 by pins.

[0032] In this embodiment, by having the front cooling fan 11 and the rear cooling fan 12 rotate synchronously with the shaft 7, the air circulation inside the permanent magnet motor body 1 can be actively accelerated, precisely matching the ventilation channels 10 on the rotor laminations 8, forming a forced air cooling cycle, quickly removing the heat generated by the rotor laminations 8 and the permanent magnet 9 during operation, forming a dual heat dissipation mode that works in conjunction with the liquid heat dissipation of the external flow cavity 203, greatly improving the overall temperature control effect of the motor, and avoiding the impact of high temperature on the motor's power output and service life.

[0033] Specifically, the front cooling fan 11 and the rear cooling fan 12 are fixedly connected to the rotating shaft 7 by pins, which can resist the centrifugal force and vibration when the motor rotates at high speed, prevent the fans from falling off and shifting, and has the advantage of easy disassembly and assembly. In addition, the front cooling fan 11 and the rear cooling fan 12 are symmetrically arranged at both ends of the rotating shaft 7, which makes the heat dissipation inside the permanent magnet motor body 1 more uniform, avoids the aging and damage of components caused by local heat accumulation, and the symmetrical structure helps to balance the force when the rotating shaft 7 rotates, reduce vibration and noise, and, together with the stable assembly of the stator 6 and the housing 5, further improves the overall smoothness of the motor operation.

[0034] like Figure 4 and Figure 5 As shown, the output end of the rotating shaft 7 is provided with a spherical roller bearing 13 and a deep groove ball bearing 14, and the non-output end of the rotating shaft 7 is provided with a cylindrical roller bearing 15.

[0035] In this embodiment, the combination of spherical roller bearing 13 and deep groove ball bearing 14 at the output end of the rotating shaft 7 can comprehensively address the complex forces generated by the rotating impeller driven by the output end. The spherical roller bearing 13 can effectively bear the radial and axial forces generated when the rotating shaft 7 rotates, and adapt to the slight expansion and contraction eccentricity of the rotating shaft 7 due to the force. The deep groove ball bearing 14 further enhances the radial support accuracy. The two work together to avoid wobbling and offset at the output end, solving the problem of large operating vibration and reduced efficiency caused by uneven force on the rotating shaft of traditional motors. The cylindrical roller bearing 15 at the non-output end of the rotating shaft 7 has excellent radial load-bearing capacity and forms a balanced support structure at both ends with the double bearings at the output end, which greatly improves the stability of the rotating shaft 7 when rotating at high speed and ensures accurate and efficient electromagnetic conversion between the stator 6 and the rotor laminations 8 and permanent magnets 9.

[0036] Specifically, the spherical roller bearing 13, the deep groove ball bearing 14, and the cylindrical roller bearing 15 are all provided with bearing retaining rings 22 on their sides.

[0037] like Figure 5 As shown, a connecting plate 23 is fixed inside the housing 5 on the side near the front cooling fan 11. A speed sensor 16 is detachably connected to the connecting plate 23, and the detection end of the speed sensor 16 faces the rotating shaft 7.

[0038] In this embodiment, a speed sensor 16 is detachably connected to the connecting plate 23, with its detection end facing the rotating shaft 7. This allows for real-time and accurate acquisition of the rotational speed data of the rotating shaft 7, providing timely feedback on the motor's operating status. This facilitates operators in adjusting operating parameters according to actual needs, ensuring the motor is always in a high-efficiency operating state and improving its energy-saving effect. Combined with the high power factor advantage brought by the permanent magnet 9, the motor is more adaptable to underwater operation in municipal pumps. It also avoids equipment failures caused by the failure to detect abnormal speed in time, thus improving the reliability of motor operation.

[0039] like Figure 4 and Figure 5 As shown, a front cover 17 is connected to one end of the housing 5, and a rear cover 18 is connected to the other end of the housing 5. Both the front cover 17 and the rear cover 18 are provided with sealing rings 19.

[0040] In this embodiment, the front cover 17 and the rear cover 18 form a complete closed protection system for the permanent magnet motor body 1, providing all-round shielding for core components such as the internal stator 6, shaft 7, and rotor laminations 8, effectively isolating underwater silt, impurities, and other corrosive substances, and preventing component wear or short circuit failures. The sealing rings 19 set inside the front cover 17 and the rear cover 18 specifically fill the gap between the end cover and the housing 5, constructing a reliable waterproof sealing barrier, completely preventing external liquids from seeping into the motor, and perfectly adapting to underwater operating conditions.

[0041] like Figure 1 and Figure 3 As shown, two hanging plates 20 are symmetrically arranged on the outside of the outer cover 201, and multiple reinforcing ribs 21 are arranged circumferentially on the outer surfaces of the permanent magnet motor body 1 and the flow cover assembly 2.

[0042] In this embodiment, the two symmetrical hanging plates 20 on the outer casing 201 provide a balanced and stable hoisting and installation support for the motor as a whole, which greatly improves the efficiency of handling and positioning of the equipment at the municipal pump installation site. The reinforcing ribs 21 on the outer surface of the permanent magnet motor body 1 significantly enhance the structural strength and deformation resistance of the shell 5, while the reinforcing ribs 21 on the outer surface of the flow cover assembly 2 strengthen the rigidity of the outer casing 201. The two work together to improve the overall vibration resistance of the motor, reduce the noise caused by structural vibration during motor operation, and prevent deformation of the shell 5 or the outer casing 201 under high pressure underwater environment.

[0043] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A submersible permanent magnet motor for a bidirectional axial flow pump, characterized in that, The device includes a permanent magnet motor body (1), a flow shroud assembly (2), and a support foot plate (3). The permanent magnet motor body (1) is connected inside the flow shroud assembly (2). The output shaft of the permanent magnet motor body (1) extends out of the flow shroud assembly (2) and is connected to a rotating impeller. The flow shroud assembly (2) is connected to the support foot plate (3). A cable outlet box (4) is provided on the flow shroud assembly (2). The flow shroud assembly (2) has a plurality of flow cavities (203) formed thereon, which are used to allow external liquid to flow through the outer surface of the permanent magnet motor body (1) to carry away heat.

2. The submersible permanent magnet motor for a bidirectional axial flow pump as described in claim 1, characterized in that, The flow cover assembly (2) includes an outer cover (201) and multiple flow channel ribs (202). The outer cover (201) is sleeved on the outside of the permanent magnet motor body (1). One end of the multiple flow channel ribs (202) is connected to the inner surface of the outer cover (201), and the other end of the multiple flow channel ribs (202) is connected to the outer surface of the permanent magnet motor body (1). The outer cover (201), the flow channel ribs (202) and the permanent magnet motor body (1) together enclose a flow cavity (203).

3. The submersible permanent magnet motor for a bidirectional axial flow pump as described in claim 1, characterized in that, The permanent magnet motor body (1) includes a housing (5), a stator (6) and a rotating shaft (7). The stator (6) is connected inside the housing (5). The rotating shaft (7) is located inside the stator (6). A rotor lamination (8) is fixedly sleeved on the outer circumference of the rotating shaft (7). A permanent magnet (9) is embedded on the outer side of the rotor lamination (8). A ventilation channel (10) is axially opened on the rotor lamination (8).

4. The submersible permanent magnet motor for a bidirectional axial flow pump as described in claim 3, characterized in that, The two ends of the rotating shaft (7) are respectively provided with a front cooling fan (11) and a rear cooling fan (12), and the front cooling fan (11) and the rear cooling fan (12) are connected to the rotating shaft (7) by pins.

5. The submersible permanent magnet motor for a bidirectional axial flow pump as described in claim 3, characterized in that, The output end of the shaft (7) is provided with a spherical roller bearing (13) and a deep groove ball bearing (14), and the non-output end of the shaft (7) is provided with a cylindrical roller bearing (15).

6. The submersible permanent magnet motor for a bidirectional axial flow pump as described in claim 3, characterized in that, Inside the housing (5), a connecting plate (23) is fixed on the side near the front cooling fan (11). A speed sensor (16) is detachably connected to the connecting plate (23), and the detection end of the speed sensor (16) faces the rotating shaft (7).

7. The submersible permanent magnet motor for a bidirectional axial flow pump as described in claim 3, characterized in that, One end of the housing (5) is connected to a front cover (17), and the other end of the housing (5) is connected to a rear cover (18). Both the front cover (17) and the rear cover (18) are provided with sealing rings (19).

8. The submersible permanent magnet motor for a bidirectional axial flow pump as described in claim 2, characterized in that, The outer cover (201) has two hanging plates (20) symmetrically arranged on its exterior.

9. The submersible permanent magnet motor for a bidirectional axial flow pump as described in claim 1, characterized in that, The outer surfaces of the permanent magnet motor body (1) and the shroud assembly (2) are both provided with multiple reinforcing ribs (21) in the circumferential direction.

10. The submersible permanent magnet motor for a bidirectional axial flow pump as described in claim 5, characterized in that, The spherical roller bearing (13), deep groove ball bearing (14) and cylindrical roller bearing (15) are all provided with bearing retaining rings (22) on their sides.

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