Permanent magnet motor-based quiet energy-saving water supply pump and pump station

Abstract

The application discloses a mute energy-saving water supply pump and pump station based on a permanent magnet motor, which comprises a pump body and a driving motor, a first disc type stator and a second disc type stator are fixed in the shell and arranged in parallel along the axial direction, coaxial first disc type rotors and second disc type rotors are arranged between the first disc type stator and the second disc type stator, the first disc type rotors are coaxially rotationally connected with the first disc type stator, and the second disc type rotors are coaxially rotationally connected with the second disc type stator; a motor shaft coaxially slides through the middle portions of the first disc type stator, the second disc type stator, the first disc type rotors and the second disc type rotors, a first clutch is arranged between the motor shaft and the first disc type rotors, and a second clutch is arranged between the motor shaft and the second disc type rotors. The two sets of disc type stators and disc type rotors arranged in the axial direction are matched with the switchable clutch structure, the motor can work alternately between different sub-motors, heat accumulation is effectively dispersed, and the reliability of long-time operation is improved.

Description

Technical Field

[0001] This invention relates to the field of pump technology, and in particular to a silent and energy-saving water supply pump and pumping station based on a permanent magnet motor. Background Technology

[0002] Axial magnetic field permanent magnet motor water pumps are devices that integrate an axial flux permanent magnet motor with the pump body into one unit. The motor adopts a disc structure, with the magnetic flux closed along the axial direction. The motor has no cogging force and very little or no electromagnetic noise, resulting in low noise. Axial magnetic field permanent magnet motors can be designed without an iron core, thereby reducing eddy current losses and achieving energy-saving effects. Compared with traditional radial flux motors, they have advantages such as a flatter structure, higher power density, higher efficiency, and easier integration with the pump body design.

[0003] However, permanent magnets are typically temperature-sensitive; their magnetic properties decrease significantly as temperature rises, affecting the output performance and reliability of permanent magnet motors. Currently, liquid cooling is the most effective heat dissipation technology, but it is complex and costly. Furthermore, once the stator winding configuration of the motor is fixed, its power performance is also fixed. However, the operating conditions of water pumps frequently change; sometimes slow speed with high torque is required, sometimes high speed with low torque, and sometimes good stability or reliability is needed. Summary of the Invention

[0004] To solve at least one of the above-mentioned technical problems, on the one hand, the present invention provides a silent and energy-saving water pump based on a permanent magnet motor, which has two sets of stator-rotor pairs in the axial direction. Different stator-rotor pairs are used to drive the shaft to rotate as needed, thereby avoiding excessive temperature and more flexibly adapting to different working conditions.

[0005] On the other hand, the present invention also proposes a pumping station with a silent and energy-saving water supply pump based on a permanent magnet motor.

[0006] The technical solution adopted in this invention is to design a silent and energy-saving water pump based on a permanent magnet motor, including a pump body and a drive motor. The drive motor includes a housing and a motor shaft. A first disc stator and a second disc stator are fixed in parallel along the axial direction inside the housing. A first disc rotor and a second disc rotor are coaxially arranged between the first disc stator and the second disc stator. The first disc rotor is rotatably connected to the first disc stator, and the second disc rotor is rotatably connected to the second disc stator. The motor shaft slides coaxially through the middle of the first disc stator, the second disc stator, the first disc rotor, and the second disc rotor. A first clutch is provided between the motor shaft and the first disc rotor, and a second clutch is provided between the motor shaft and the second disc rotor. The motor shaft is controlled by a moving device to move axially, so that one of the first clutch and the second clutch is in a closed state and the other is in a disengaged state.

[0007] In some embodiments, a partition is provided between the first disc rotor and the second disc rotor, the partition axially isolating the empty space inside the housing, and the motor shaft slides in conjunction with the partition.

[0008] In some embodiments, the first clutch includes a first fixed gear disk coaxially fixedly connected to the first disc rotor and a first movable gear disk coaxially fixedly connected to the motor shaft, wherein the opposite end faces of the first fixed gear disk and the first movable gear disk are provided with helical teeth that can mesh with each other axially; the second clutch includes a second fixed gear disk coaxially fixedly connected to the second disc rotor and a second movable gear disk coaxially fixedly connected to the motor shaft, wherein the opposite end faces of the second fixed gear disk and the second movable gear disk are provided with helical teeth that can mesh with each other axially.

[0009] In some embodiments, the number of turns in the windings of the first disc stator is different from that in the windings of the second disc stator.

[0010] In some embodiments, the moving device includes a first shape memory alloy spring and a second shape memory alloy spring sleeved on the motor shaft, wherein the first shape memory alloy spring is located between the first moving gear and the partition, and the second shape memory alloy spring is located between the second moving gear and the partition.

[0011] In some embodiments, a first fan is provided on the other side of the first disc stator relative to the first disc rotor; a second fan is provided on the other two sides of the second disc stator relative to the second disc rotor; a third clutch is provided between the first fan and the motor shaft; a fourth clutch is provided between the second fan and the motor shaft; the first clutch and the third clutch are closed simultaneously; and the second clutch and the fourth clutch are closed simultaneously.

[0012] In some embodiments, a ventilation hole is provided on the motor shaft between the first clutch and the second clutch, and an air intake channel connecting the ventilation hole to the outside is provided inside the motor shaft; when the first clutch is closed, the ventilation hole connects the space between the first disc rotor and the partition plate; when the second clutch is closed, the ventilation hole connects the space between the second disc rotor and the partition plate.

[0013] In some embodiments, the housings of the first fan and the second fan, which are circumferentially corresponding, are provided with ventilation openings that communicate with the outside.

[0014] In some embodiments, the impeller shaft of the pump body is axially slidably connected to the motor shaft.

[0015] A pumping station, the pumping station comprising the aforementioned silent energy-saving water supply pump.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention proposes a silent, energy-saving water pump based on a permanent magnet motor. By axially arranging two sets of disc-type stators and rotors, along with a switchable clutch structure, the motor can alternate between different sub-motors, effectively dispersing heat accumulation, reducing the risk of permanent magnet demagnetization, and improving long-term operational reliability. Simultaneously, the two stators can employ different winding turn numbers, enabling the pump to achieve stronger starting and boosting capabilities under low-speed, high-torque conditions, while maintaining high efficiency under high-speed, low-torque conditions, achieving adaptive operation under multiple operating conditions. This invention also incorporates a shape memory alloy spring-driven axial movement mechanism, a paired fan cooling structure, and an internal shaft ventilation channel to form a highly efficient air cooling system, significantly reducing the temperature rise of the stator and permanent magnet. The overall solution features a compact structure, low noise, significant energy savings, and high operational stability, making it suitable for various high-performance water supply equipment. Attached Figure Description

[0018] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings. To illustrate the details and facilitate understanding of its principles, the drawings are not necessarily to scale, and similar reference numerals may describe similar components in different views. The accompanying drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Wherein:

[0019] Figure 1 This is a schematic diagram of the first disc rotor of the motor driving the motor shaft to rotate.

[0020] Figure 2 This is a schematic diagram of the second disc rotor of the motor driving the motor shaft to rotate.

[0021] Figure 3 This is a schematic diagram of the water pump in Example 2.

[0022] Figure 4 This is a schematic diagram of the pumping station.

[0023] In the diagram, 1. Housing; 2. Motor shaft; 3. First disc stator; 4. Second disc stator; 5. First disc rotor; 6. Second disc rotor; 7. Partition plate; 8. First fixed gear disc; 9. First movable gear disc; 10. Second fixed gear disc; 11. Second movable gear disc; 12. First shape memory alloy spring; 13. Second shape memory alloy spring; 14. First fan; 15. Second fan; 16. Third clutch; 17. Fourth clutch; 18. Ventilation hole; 19. Air inlet channel; 20. Support body; 21. Ventilation opening; 22. Sleeve; 23. Active telescopic device; 24. Thrust bearing; 25. Pump body; 26. Water supply pipe; 27. Water outlet pipe. Detailed Implementation

[0024] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments, and the following embodiments do not limit the invention covered by the claims. Furthermore, not all combinations of the features described in the embodiments are necessary for the inventive solution.

[0025] The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0026] Example 1

[0027] like Figure 1 , 2 As shown, a silent and energy-saving water pump based on a permanent magnet motor includes a pump body 25 for conveying water and a drive motor for rotating an impeller inside the pump body 25. The drive motor includes a housing 1 and a motor shaft 2. In this embodiment, the motor housing 1 and the housing 1 of the pump body 25 are integrally formed. A first disc stator 3 and a second disc stator 4 are fixed inside the housing 1 and arranged in parallel along the axial direction. The disc stator is provided with windings for forming an axial alternating magnetic field.

[0028] A first disc rotor 5 and a second disc rotor 6 are coaxially arranged between the first disc stator 3 and the second disc stator 4. Several permanent magnets are evenly distributed around the disc rotor. The constant magnetic field generated by the permanent magnets interacts with the rotating magnetic field generated by the stator winding current, thereby causing the rotor to rotate. The specific principle is referred to in the existing technology of axial permanent magnet motors, which will not be repeated here.

[0029] The first disc rotor 5 is coaxially rotatably connected to the first disc stator 3, and the second disc rotor 6 is coaxially rotatably connected to the second disc stator 4. The motor shaft 2 slides coaxially through the middle of the first disc stator 3, the second disc stator 4, the first disc rotor 5, and the second disc rotor 6. That is, the stator and rotor are connected by a tubular shaft for relative rotation, allowing the rotor to rotate coaxially with respect to the stator while maintaining a constant axial relative distance. The motor shaft 2 slides coaxially through the cavity of the tubular shaft, ensuring a certain radial distance between the motor shaft 2 and the stator and rotor, preventing mutual interference during rotation. The first disc stator 3 and the first disc rotor 5 constitute one sub-motor, and the second disc stator 4 and the second disc rotor 6 constitute another sub-motor.

[0030] A first clutch is provided between the motor shaft 2 and the first disc rotor 5, and a second clutch is provided between the motor shaft 2 and the second disc rotor 6. The motor shaft 2 is controlled by a moving device to move axially, so that one of the first clutch and the second clutch is in a closed state while the other is in a disengaged state. When the first clutch is closed and the first disc stator 3 is energized and rotates, the rotation of the motor shaft 2 is driven by the first disc rotor 5. When the second clutch is closed and the second disc stator 4 is energized, the rotation of the motor shaft 2 is driven by the second disc rotor 6. In this way, the two clutches can be closed alternately, so that the first disc stator 3 and the second disc stator 4 can work alternately to conduct electricity, thereby avoiding the overheating caused by using only one stator. For example, one stator can work for a certain period of time, and then the other stator can work for a certain period of time. The duration of the time period can be determined by theoretical deduction or experimentation and controlled by the preset program of the control unit. Alternatively, a temperature sensor can be set near the stator or rotor to detect the temperature, and the control unit can control the switching of the two clutches according to the temperature change, thereby avoiding the stator or rotor temperature from becoming too high.

[0031] The first disc stator 3 and the second disc stator 4 can adopt different structures, resulting in different electromagnetic properties and operating characteristics to adapt to different operating conditions of the water pump. For example, the windings of the first disc stator 3 and the second disc stator 4 have different numbers of turns. Increasing the number of turns strengthens the magnetomotive force generated by the stator, increasing the motor's back electromotive force and output torque. This provides stronger driving capability under low-speed or heavy-load starting conditions, improving the starting reliability of the water pump and other loads. However, increasing the number of turns increases the coil length and copper losses, leading to increased motor temperature and decreased efficiency. Therefore, this stator can only operate during startup or when high water pressure is required. When the water pressure requirement is relatively high, a stator with fewer turns can be used, reducing resistance and copper losses, and improving the pump's efficiency and high-speed operation capability.

[0032] Furthermore, a partition 7 is provided between the first disc rotor 5 and the second disc rotor 6. The partition 7 axially isolates the empty space inside the housing 1, and the motor shaft 2 is slidably engaged with the partition 7. The partition 7 can be made of heat-insulating material, thereby reducing the mutual influence of heat generated by the two stators.

[0033] The first clutch includes a first fixed gear disk 8 coaxially fixedly connected to the first disc rotor 5 and a first movable gear disk 9 coaxially fixedly connected to the motor shaft 2. The opposite end faces of the first fixed gear disk 8 and the first movable gear disk 9 are provided with helical teeth that can mesh with each other axially. The second clutch includes a second fixed gear disk 10 coaxially fixedly connected to the second disc rotor 6 and a second movable gear disk 11 coaxially fixedly connected to the motor shaft 2. The opposite end faces of the second fixed gear disk 10 and the second movable gear disk 11 are provided with helical teeth that can mesh with each other axially.

[0034] In other words, the clutch in this embodiment is an axial jaw clutch. The first clutch uses a first fixed gear disc 8 and a first movable gear disc 9 to engage, with helical teeth on the opposite end faces of both discs. The first fixed gear disc 8 rotates with the first disc rotor 5, and the first movable gear disc 9 is fixed to the motor shaft 2. When the motor shaft 2 moves axially to the engagement position under the drive of the moving device, the helical teeth of both automatically align and gradually engage, realizing the smooth transmission of power from the first disc rotor 5 to the motor shaft 2; when the motor shaft 2 moves in the opposite direction, the helical teeth disengage, and the first sub-motor separates from the motor shaft 2. The second clutch has the same structure and function, realizing the controllable connection between the second disc rotor 6 and the motor shaft 2 through the second fixed gear disc 10 and the second movable gear disc 11.

[0035] The helical gear clutch structure has self-guiding and self-correcting capabilities, enabling smooth engagement even with slight axial misalignment or a certain speed difference, avoiding impact and tooth surface damage, thereby reducing noise and improving the reliability of clutch switching. Through this structure, motor shaft 2 can quickly switch between two sets of sub-motors, achieving alternating operation of the drive source. This helps reduce the temperature rise of individual stators and allows for flexible selection of different sub-motors based on different operating conditions, improving the overall efficiency and stability of the water supply pump system.

[0036] The moving device includes a first shape memory alloy spring 12 and a second shape memory alloy spring 13 sleeved on the motor shaft 2. The first shape memory alloy spring 12 is located between the first moving gear 9 and the partition 7, and the second shape memory alloy spring 13 is located between the second moving gear 11 and the partition 7. That is, the moving device uses a first shape memory alloy spring 12 and a second shape memory alloy spring 13 disposed on the outer periphery of the motor shaft 2. The first shape memory alloy spring 12 is arranged between the first moving gear 9 and the partition 7. When it is heated to the phase change temperature, it elongates, pushing the first moving gear 9 to move towards the first fixed gear 8, thus engaging the first clutch; after cooling, it returns to its original shape, disengaging it. Similarly, the second shape memory alloy spring 13, located between the second moving gear 11 and the partition 7, can push the motor shaft 2 to move in the opposite direction after being heated, thereby closing the second clutch. The ability of shape memory alloy springs to expand and contract according to temperature is well-known prior art and will not be elaborated here.

[0037] This structure achieves precise axial displacement without the need for complex electromagnetic or hydraulic actuators, offering advantages such as simple structure, fast response, and low energy consumption. By controlling the energized heating state of the two shape memory alloy springs, the alternating switching of the two clutches can be reliably achieved, thereby ensuring smooth switching and stable drive output between the sub-motors.

[0038] Furthermore, a first fan 14 is provided on the other side of the first disc stator 3 relative to the first disc rotor 5; a second fan 15 is provided on the other two sides of the second disc stator 4 relative to the second disc rotor 6. A third clutch 16 is provided between the first fan 14 and the motor shaft 2, and a fourth clutch 17 is provided between the second fan 15 and the motor shaft 2. The first clutch and the third clutch 16 are closed simultaneously, and the second clutch and the fourth clutch 17 are closed simultaneously. The third clutch 16 and the fourth clutch 17 operate on the same principle as the first clutch, and are also axial jaw clutches. When the first clutch is closed and drives the first disc rotor 5 to work, the third clutch 16 is closed synchronously, causing the motor shaft 2 to simultaneously drive the first fan 14 to rotate, thereby enhancing the airflow cooling around the first sub-motor; when the second clutch is closed, the fourth clutch 17 is closed synchronously, driving the second fan 15 to work in the same way.

[0039] This allows the motor subsystem to work synchronously with the corresponding fan, enabling each disc stator and rotor assembly to achieve independent and efficient heat dissipation during operation, avoiding mutual thermal interference, further suppressing the temperature rise of permanent magnets and copper losses, and improving the reliability and continuous output capability of the overall water supply pump system.

[0040] The motor shaft 2 has several ventilation holes 18 between the first clutch and the second clutch. An air intake channel 19 is formed inside the motor shaft 2, which communicates with the ventilation holes 18 and is connected to the outside of the housing 1, allowing external cold air to enter the space where the stator and rotor are located through the ventilation holes 18. Of course, if adjustment allows, the air intake channel 19 can also be connected to a compressed air source through a rotary pipe joint, thereby using a higher airflow to cool the motor.

[0041] When the first clutch is engaged, the ventilation hole 18 connects with the space between the first disc rotor 5 and the partition 7. The first fan 14 rotates to generate negative pressure, drawing in external air through the air inlet channel 19 and introducing it into the first sub-motor assembly through the ventilation hole 18, thereby providing directional heat dissipation for the first disc stator 3 and the first disc rotor 5. When the second clutch is engaged, the ventilation hole 18 connects with the space between the second disc rotor 6 and the partition 7, and the second fan 15 drives the airflow to dissipate heat for the second sub-motor assembly in the same way.

[0042] External ventilation openings 21 are provided on the housing 1 at corresponding positions around the two fans, allowing the fans to smoothly exhaust internal hot air and forming an effective airflow path. In this way, while the different sub-motors are working independently, they can be guaranteed to obtain independent, sufficient, and low-resistance air cooling capacity, reducing the temperature rise of the permanent magnet and windings, extending service life, and improving the overall reliability and efficiency of the water pump.

[0043] A support body 20 is provided on the other side of the fan relative to the stator in the axial direction to support the rotation of the motor shaft 2. This allows the fan to be located within the space defined by the housing 1, the support body 20, and the stator. In the radial direction, there is a large gap between the stator and the motor shaft 2 for airflow, while the distance between the rotor and the motor shaft 2 is smaller. The vent 21 is located close to the stator. Therefore, when the fan is working, the external airflow enters from the vent, passes through the rotor, passes through the air gap between the stator and the rotor, and then exits through the vent on the housing 1 on the back side of the stator. This allows the airflow to flow as far as possible over the surfaces of the rotor and stator, quickly carrying away heat and achieving effective cooling.

[0044] The impeller shaft of the pump body 25 and the motor shaft 2 adopt an axial sliding connection structure. The two are connected only in the rotational direction and can move relative to each other in the axial direction through a spline, a secondary key, or a sleeve 22. In this embodiment, the impeller shaft of the pump body 25 is provided with a sleeve 22, and the inner side wall of the sleeve 22 is provided with an axial sliding groove. The motor shaft 2 is provided with a protrusion that slides with the sliding groove, thereby enabling the two to be connected in an axial sliding fit.

[0045] When the motor shaft 2 moves axially to switch the clutch, the impeller shaft will not be subjected to axial force transmission, ensuring the impeller position is stable and avoiding impact on the water pump sealing structure. At the same time, this structure can compensate for manufacturing and assembly errors, improve the smoothness of the sub-motor switching process, help maintain the stability of the water pump output flow and pressure, and improve the reliability of system operation.

[0046] like Figure 4 As shown, a pumping station using the aforementioned silent and energy-saving water supply pump includes two water pumps connected in parallel on the water supply pipe 26 and the water outlet pipe 27. When one water pump is under maintenance, the other can remain in operation, thereby avoiding any impact on the water supply.

[0047] Example 2

[0048] like Figure 3 As shown, an active telescopic device 23, such as an electric cylinder, can also be used to actively control the movement of the motor shaft 2 through the thrust bearing 24, thereby achieving the same technical effect of controlling the movement of the motor shaft 2. These are simple existing technologies and will not be elaborated here.

[0049] The specific embodiments described herein are merely illustrative examples illustrating the spirit of the invention. Those skilled in the art can make various modifications or additions to the described embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A silent and energy-saving water pump based on a permanent magnet motor, comprising a pump body and a drive motor, characterized in that, The drive motor includes a housing and a motor shaft. A first disc stator and a second disc stator are fixed within the housing and arranged parallel to each other along the axial direction. A first disc rotor and a second disc rotor are coaxially disposed between the first disc stator and the second disc stator. The first disc rotor is rotatably connected to the first disc stator, and the second disc rotor is rotatably connected to the second disc stator. The motor shaft slides coaxially through the middle of the first disc stator, the second disc stator, the first disc rotor, and the second disc rotor. A first clutch is provided between the motor shaft and the first disc rotor, and a second clutch is provided between the motor shaft and the second disc rotor. The motor shaft is controlled by a moving device to move axially, thereby engaging the first clutch and the second clutch. One of the components is in a closed state while the other is in a disengaged state; a partition is provided between the first disc rotor and the second disc rotor, the partition axially isolating the empty space inside the housing, and the motor shaft is slidably engaged with the partition; the first clutch includes a first fixed gear disc coaxially fixedly connected to the first disc rotor and a first movable gear disc coaxially fixedly connected to the motor shaft, and the opposite end faces of the first fixed gear disc and the first movable gear disc are provided with helical teeth that can mesh axially with each other; the second clutch includes a second fixed gear disc coaxially fixedly connected to the second disc rotor and a second movable gear disc coaxially fixedly connected to the motor shaft, and the opposite end faces of the second fixed gear disc and the second movable gear disc are provided with helical teeth that can mesh axially with each other.

2. The silent and energy-saving water pump based on a permanent magnet motor according to claim 1, characterized in that, The number of turns in the windings of the first disc stator is different from that in the windings of the second disc stator.

3. The silent and energy-saving water pump based on a permanent magnet motor according to claim 1, characterized in that, The moving device includes a first shape memory alloy spring and a second shape memory alloy spring sleeved on the motor shaft. The first shape memory alloy spring is located between the first moving gear and the partition, and the second shape memory alloy spring is located between the second moving gear and the partition.

4. The silent and energy-saving water pump based on a permanent magnet motor according to claim 1, characterized in that, A first fan is provided on the other side of the first disc stator relative to the first disc rotor; a second fan is provided on the other two sides of the second disc stator relative to the second disc rotor. A third clutch is provided between the first fan and the motor shaft, and a fourth clutch is provided between the second fan and the motor shaft. The first clutch and the third clutch are closed simultaneously, and the second clutch and the fourth clutch are closed simultaneously.

5. The silent and energy-saving water pump based on a permanent magnet motor according to claim 4, characterized in that, A ventilation hole is provided on the motor shaft between the first clutch and the second clutch, and an air intake channel connecting the ventilation hole to the outside is provided inside the motor shaft; when the first clutch is closed, the ventilation hole connects the space between the first disc rotor and the partition plate; when the second clutch is closed, the ventilation hole connects the space between the second disc rotor and the partition plate.

6. The silent and energy-saving water pump based on a permanent magnet motor according to claim 5, characterized in that, The first fan and the second fan have ventilation openings on their circumferentially corresponding housings that connect to the outside.

7. The silent and energy-saving water pump based on a permanent magnet motor according to claim 1, characterized in that, The impeller shaft of the pump body is axially slidably connected to the motor shaft.

8. A pumping station, characterized in that, The pumping station includes the silent and energy-saving water supply pump as described in any one of claims 1 to 7.

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